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Li X, Zhong T, Xiao Y, Cheng H, Chen H. Mechanically robust, thermal insulating sustainable foams fully derived from bamboo fibers through high temperature drying. Carbohydr Polym 2024; 333:121966. [PMID: 38494221 DOI: 10.1016/j.carbpol.2024.121966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/02/2024] [Accepted: 02/16/2024] [Indexed: 03/19/2024]
Abstract
The development of lignocellulosic foams has been gaining momentum due to their sustainability and biodegradability. However, lignocellulosic foams often have low preparation efficiency and poor mechanical properties, especially compression performance. Here, we constructed mechanically robust and thermal insulating cellulosic foams through high-temperature drying, in which all bamboo-sourced lignin-containing pulp fibers (LPF) and steam explosion fibers (SEF) were chosen as a skeleton and high solid fibrillated cellulose (HSFC) as a binder. This study aimed to investigate the effects of the characteristics of bamboo fibers and the HSFC addition on the formation, and mechanical- and thermal insulation performances of the resulting foams. The HSFC incorporation endowed the foams with excellent mechanical performance, the stress at 10 % strain and compressive modulus were 0.29 MPa and 4.4 MPa, respectively, which were 10-fold and 44-fold compared to LPF foam without HSFC. The LPF/HSFC possessed excellent energy absorption capacity (170 kJ/m3 under 40 % strain) as well as good thermal insulating performance (0.054 W/(m·K)). The LPF/HSFC foam with a much more homogeneous cellular structure outperformed the SEF/HSFC foam. This work suggests that the developed bamboo fiber foams hold promise for use in protective packaging and thermal insulation applications.
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Affiliation(s)
- Xin Li
- College of Furnishings and Industrial Design and Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; International Centre for Bamboo and Rattan, Beijing 100102, China
| | - Tuhua Zhong
- International Centre for Bamboo and Rattan, Beijing 100102, China; NFGA/Beijing Key Laboratory for Bamboo & Rattan Science and Technology, National Forestry and Grassland Administration, Beijing 100102, China.
| | - Yunyan Xiao
- College of Furnishings and Industrial Design and Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
| | - Haitao Cheng
- International Centre for Bamboo and Rattan, Beijing 100102, China; NFGA/Beijing Key Laboratory for Bamboo & Rattan Science and Technology, National Forestry and Grassland Administration, Beijing 100102, China.
| | - Hong Chen
- College of Furnishings and Industrial Design and Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
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2
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He R, Cao X, Langi E, Masseling L, Vogt F, Zhao L. Electrochemical polishing, characterisation and in vitro evaluation of additively manufactured CoCr stents with personalised designs. Biomater Adv 2024; 159:213835. [PMID: 38531259 DOI: 10.1016/j.bioadv.2024.213835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 03/09/2024] [Accepted: 03/19/2024] [Indexed: 03/28/2024]
Abstract
Additive manufacturing (AM) technology has paved the way for manufacturing personalised stents. However, there is a notable gap in comprehensive microstructure analyses and in vitro evaluations of the AM CoCr stents using advanced methodologies. To address this gap, this study focuses on investigating the microstructure and in vitro performance of personalised CoCr stents manufactured through micro-laser powder bed fusion (μ-LPBF). The evaluation process begins with the measurements of dimensions and surface roughness, followed by in-depth microstructural analyses. To improve surface roughness and reduce excessive strut size, the μ-LPBF stents undergo electrochemical polishing. Importantly, in vitro stent deployments are carried out in artificial arteries manufactured based on actual patients' data. Compared to the commercial MULTI-LINK VISION CoCr stent, the μ-LPBF personalised stents have rough surface finish (average roughness: 1.55 μm for μ-LPBF vs. 1.09 μm for commercial) and compromised grain microstructures (elongated for μ-LPBF vs. equiaxed for commercial). However, the personalised stents demonstrate better performances in in vitro tests. Notably, compared to the commercial stent in the two studied cases, they deliver larger lumen gains (up to 11.24 %) and reduced recoils (up to 4 times). This study validates the merit of the lesion-specific designs and the feasibility of using AM technology for stent fabrication.
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Affiliation(s)
- Ran He
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK; School of Engineering, University of Leicester, Leicester LE1 7RH, UK
| | - Xuezhi Cao
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK
| | - Enzoh Langi
- The Copperbelt University, School of Engineering, Mechanical Department, Jambo Drive, Kitwe, Zambia
| | - Lukas Masseling
- Fraunhofer-Institute for Laser Technology ILT, 52074 Aachen, Germany; Aixway3D GmbH, 52074 Aachen, Germany
| | - Felix Vogt
- Medical Clinic I, University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Liguo Zhao
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough LE11 3TU, UK; College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
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3
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Xiao Q, Dai M, Huang M, Lim LT. Bioinspired pullulan-starch nanoplatelets nanocomposite films with enhanced mechanical properties. Carbohydr Polym 2024; 329:121769. [PMID: 38286544 DOI: 10.1016/j.carbpol.2023.121769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 12/11/2023] [Accepted: 12/29/2023] [Indexed: 01/31/2024]
Abstract
Inspired by the leaf-vein network structure, the pullulan-starch nanoplatelets (SNPs) bioinspired films with enhanced strength and toughness were successfully fabricated through a water evaporation-induced self-assembly technique. SNPs (SNP200 and SNP600) of two sizes were separated by differential centrifugation. Interactions between SNPs and pullulan during drying resulted in the vein-like network structure in both nanocomposite films when the appropriate amounts of SNP200 or SNP600 were added to pullulan, respectively. The TS and toughness values of pullulan with 1 % w/w SNP200 films reached up to 51.05 MPa and 69.65 MJ·m-3, which were 86 % and 223 % higher than those of the neat pullulan films, respectively. Moreover, the TS and toughness values of pullulan-SNP200 were significantly higher than those of pullulan-SNP600 films, when SNP content exceeded the 1 % w/w level. By applying a graph theory, the network structures were found to correlate with the mechanical properties of the pullulan-SNPs bioinspired films. The new strategy for designing starch nanoplatelets-based edible films that combine mechanical strength and toughness holds promises for the development of novel biobased composite materials for food packaging application.
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Affiliation(s)
- Qian Xiao
- School of Food Science and Technology, Hunan Agricultural University, 410128 Hunan, China.
| | - Miaoqi Dai
- School of Food Science and Technology, Hunan Agricultural University, 410128 Hunan, China
| | - Min Huang
- School of Food Science and Technology, Hunan Agricultural University, 410128 Hunan, China
| | - Loong-Tak Lim
- Department of Food Science, University of Guelph, N1G 2W1 Ontario, Canada
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Bruno de Oliveira Silva M, Barcelos da Costa T, Camani PH, Dos Santos Rosa D. Chitosan-based foam composites for hexavalent chromium remediation: Effect of microcellulose and crosslinking agent content. Int J Biol Macromol 2024; 264:130446. [PMID: 38423428 DOI: 10.1016/j.ijbiomac.2024.130446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 01/18/2024] [Accepted: 02/23/2024] [Indexed: 03/02/2024]
Abstract
Potentially toxic metal ions, such as hexavalent chromium (Cr6+), present in water concern the population's health due to their persistence, bioaccumulation potential, and high toxicity. Highly porous materials based on polysaccharides are promising technologies for metal removal due to their high surface area, biodegradability, and low toxicity. This study evaluated the effect of concentrations of microcellulose (0.5, 1, and 1.5 %) and glutaraldehyde (1, 2, and 3 %) in the adsorption capacity and mechanical properties of chitosan foams. The developed foams exhibited a three-dimensional structure with interconnected pores. Compared to foams without microcellulose, adding 1.5 % microcellulose increased up to 180 % in maximum stress supported by the foams and up to 135 % in Young's modulus. However, Cr6+ sorption capacity decreased with increasing microcellulose and crosslinking agent content due to the occupation of amino groups. Still, the foams exhibited a highly favorable sorption behavior, and the Sips isotherm model provided the best fit to the experimental data. The maximum sorption capacity reached approximately 1.4 mmol·g-1 at pH 4.0 and 25 °C. The foam structural integrity, enhanced mechanical properties, and efficient sorption capacity make them viable alternatives for environmentally friendly and cost-effective treatment of water contaminated with Cr6+ ions.
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Affiliation(s)
- Marcelo Bruno de Oliveira Silva
- Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil.
| | - Talles Barcelos da Costa
- Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil
| | - Paulo Henrique Camani
- Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil
| | - Derval Dos Santos Rosa
- Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil.
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Reda R, Ahmed Y, Magdy I, Nabil H, Khamis M, Lila MA, Refaey A, Eldabaa N, Elmagd MA, Ragab AE, Elsayed A. Wall panel structure design optimization of a hexagonal satellite. Heliyon 2024; 10:e24159. [PMID: 38293483 PMCID: PMC10824784 DOI: 10.1016/j.heliyon.2024.e24159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/31/2023] [Accepted: 01/04/2024] [Indexed: 02/01/2024] Open
Abstract
Considering that it satisfies high strength and stiffness at a low weight, the grid structure is the ideal option for meeting the requirements for developing the wall panel structure for the satellite. The most attractive grid structures for the satellite wall panel industry are isogrid and honeycomb structures. The first part of this work involves studying the mechanical and dynamic performance of five designs for the satellite wall panel made of 7075-T0 Al-alloy. These designs include two isogrid structures with different rib widths, two honeycomb structures with different cell wall thicknesses, and a solid structure for comparison. The performance of these designs was evaluated through compression, bending, and vibration testing using both finite element analysis (FEA) with the Ansys workbench and experimental testing. The FEA results are consistent with the experimental ones. The results show that the isogrid structure with a lower rib thickness of 2 mm is the best candidate for manufacturing the satellite wall panel, as this design reveals the best mechanical and dynamic performance. The second part of this work involves studying the influence of the length of the sides of the best isogrid structure in the range of 12 mm-24 mm on its mechanical and dynamic performance to achieve the lowest possible mass while maintaining the structure's integrity. Then, a modified design of skinned wall panels was introduced and dynamically tested using FEA. Finally, a CAD model of a hexagonal satellite prototype using the best-attained design of the wall panel, i.e., the isogrid structure with a 2 mm rib width and 24 mm-long sides, was built and dynamically tested to ensure its safe design against vibration. Then, the satellite prototype was manufactured, assembled, and successfully assessed.
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Affiliation(s)
- Reham Reda
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Yasmeen Ahmed
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Islam Magdy
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Hossam Nabil
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Mennatullah Khamis
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Mohamed Abo Lila
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Ahmed Refaey
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Nada Eldabaa
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Manar Abo Elmagd
- Department of Mechanical Engineering, Faculty of Engineering, Suez University, P.O.Box: 43221, Suez, Egypt
| | - Adham E. Ragab
- Department of Industrial Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia
| | - Ahmed Elsayed
- Advanced Forming Research Centre, Strathclyde University, Renfrew, Glasgow, PA4 9LJ, Scotland
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Li X, Liu Z, Liu Z, Li Y, Tang L, Zhang W, Lu X, Li Y, Niu R, Qu J. High transparency, degradable and UV-protective poly(lactic acid) composites based on elongational rheology and chain extender assisted melt blending. Int J Biol Macromol 2024; 256:128469. [PMID: 38040153 DOI: 10.1016/j.ijbiomac.2023.128469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 11/13/2023] [Accepted: 11/26/2023] [Indexed: 12/03/2023]
Abstract
Conventional polylactic acid (PLA) melt plasticization and toughening processes are typically achieved at the expense of PLA strength and transparency, which is clearly detrimental to its application in areas such as smart home and food packaging. Herein, an ultraviolet (UV)-protective PLA-based composite (PP6) that simultaneously achieves high strength (63.3 MPa), high plasticity (125.3 %), and enhanced toughness (4.3 kJ/m2) by adding only 6 wt% poly(3-hydroxybutyrate-4-hydroxybutyrate) (P34HB) under the assist of 1 wt% chain extender was prepared using melt blending technique. Benefiting from the cross-linking effect of the chain extender and the elongational flow during processing, the compatibility between P34HB and PLA, as well as the thermomechanical properties, heat resistance, and biodegradable properties of the composite, have been enhanced significantly. The extremely low melt enthalpy (1.9 J/g) and the low crystallinity PLA phase contribute to an appropriate transparency (78.3 % of glass in 400-1100 nm). The prepared composites display mid- and long-wave UV-protective performance, which is superior to conventional industrial glasses. Through the superior elongational rheology technology, PP6 maintains favorable overall properties even after six thermomechanical cycles. Collectively, the composite fabricated in this work is an attractive candidate for future applications such as smart windows, food packaging, agricultural films, and biomedical applications.
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Affiliation(s)
- Xiaolong Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China
| | - Zhipeng Liu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China; School of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China
| | - Zhigang Liu
- COFCO(Jilin) Bio-Chemical Technology Co., Ltd., Changchun 130000, PR China
| | - Ying Li
- COFCO(Jilin) Bio-Chemical Technology Co., Ltd., Changchun 130000, PR China
| | - Lei Tang
- COFCO(Jilin) Bio-Chemical Technology Co., Ltd., Changchun 130000, PR China
| | - Wei Zhang
- COFCO(Jilin) Bio-Chemical Technology Co., Ltd., Changchun 130000, PR China
| | - Xiang Lu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China
| | - Yi Li
- COFCO(Jilin) Bio-Chemical Technology Co., Ltd., Changchun 130000, PR China.
| | - Ran Niu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China.
| | - Jinping Qu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, PR China.
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Wu J, Ma Q, Pang Q, Hu S, Wan Z, Peng X, Cheng X, Geng L. Constructing triple-network cellulose nanofiber hydrogels with excellent strength, toughness and conductivity for real-time monitoring of human movements. Carbohydr Polym 2023; 321:121282. [PMID: 37739523 DOI: 10.1016/j.carbpol.2023.121282] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 07/17/2023] [Accepted: 08/08/2023] [Indexed: 09/24/2023]
Abstract
In recent years, there has been a lot of interest in developing composite hydrogels with superior mechanical and conductive properties. In this study, triple-network (TN) cellulose nanofiber hydrogels were prepared by using cellulose nanofiber as the first network, isotropic poly(acrylamide-co-acrylic acid) as the second network, and polyvinyl alcohol as the third network via a cyclic freezing-thawing process. The strong (9.43 ± 0.14 MPa tensile strength, (445.5 ± 7.0)% elongation-at-break), tough (15.12 ± 0.14 MJ/m3 toughness), and conductive (0.0297 ± 0.00021 S/cm ionic conductivity) TN cellulose nanofiber hydrogels were effectively created after being pre-stretched in an external force field, cross-linked by Fe3+ and added Li+. The produced composite TN cellulose nanofiber hydrogels were successfully used as a flexible sensor for real-time monitoring and detecting human movements, highlighting their potential for wearable electronics, medical technology, and human-machine interaction. CHEMICAL COMPOUNDS STUDIED IN THIS ARTICLE: Acrylamide (PubChem CID: 6579); Acrylic acid (PubChem CID: 6581); Ammonium persulfate (PubChem CID: 6579); N, N'-methylene bisacrylamide (PubChem CID: 17956053); Sodium bromide (PubChem CID: 253881); Sodium hydroxide (PubChem CID: 14798); Sodium hypochlorite (PubChem CID: 23665760); Sodium chlorite (PubChem CID: 23668197); 2,2,6,6-tetramethylpiperidinyl-1-oxide (PubChem CID: 2724126); Polyvinyl alcohol (PubChem CID: 11199); Lithium chloride (PubChem CID: 433294); Iron nitrate nonahydrate (PubChem CID: 129774236).
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Affiliation(s)
- Jianming Wu
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China.
| | - Qian Ma
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China
| | - Qingkai Pang
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China
| | - Shuaishuai Hu
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China
| | - Zhihao Wan
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China
| | - Xiangfang Peng
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China
| | - Xi Cheng
- National Mold Product Quality Supervision and Inspection Center, Guangdong Dongguan Quality Supervision Testing Center, Dongguan, Guangdong 523808, China.
| | - Lihong Geng
- Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350118, China.
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Cabral MR, Nakanishi EY, Santos SF, Fiorelli J. Enhancement of oriented cement-bonded boards' properties through CO 2 curing. Environ Sci Pollut Res Int 2023; 30:117214-117224. [PMID: 37864704 DOI: 10.1007/s11356-023-30455-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 10/08/2023] [Indexed: 10/23/2023]
Abstract
This study investigates the effects of CO2 curing on oriented cement-bonded boards. The boards comprised 35% and 45% (by mass) of strand-type particles of Eucalyptus spp. (8 × 2 × 0.1 cm) and 65% and 55% (by mass) of early high-strength Portland cement. To fabricate the boards, three layers of strands were arranged perpendicular to the previous layer, aiming for a target density of 1250 kg/m3, and the dimensions of the boards were 40 × 40 × 1 cm. The oriented cement-bonded boards underwent three different curing conditions: control, CO2 curing for 6 h, and 12 h, followed by curing in a saturated environment until the 28th day. The results indicated that CO2 curing increased the CaCO3 content in the boards, particularly when the curing period was longer (12 h). The physical and mechanical performance of the CO2-cured boards surpassed that of the control boards, with the modulus of rupture (MOR) increasing by 80% (6 h) and 84% (12 h) compared to the control. Scanning electron microscope investigations revealed that CO2 curing produced a denser matrix, leading to an improved bond between the strands and the matrix, resulting in enhanced technical performance. Based on these findings, this study suggests that CO2 curing can enhance the physical and mechanical properties of oriented cement-bonded boards, and a longer curing time (12 h) yielded superior performance.
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Affiliation(s)
- Matheus R Cabral
- Research Nucleus On Materials for Biosystems (BioSMat), Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, 13635-900, Brazil.
- Natural Sciences and Engineering Research Council of Canada (NSERC), Industrial Research Chair On Eco-Responsible Wood Construction, Department of Wood and Forest Sciences, Université Laval, Quebec City, QC, G1V 0A6, Canada.
| | - Erika Y Nakanishi
- Research Nucleus On Materials for Biosystems (BioSMat), Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, 13635-900, Brazil
- Research and Development Institute for the Agri-Environment (IRDA), Quebec City, QC, G1P 3W8, Canada
| | - Sérgio F Santos
- Department of Materials and Technology, School of Engineering and Sciences, São Paulo State University (UNESP), Av. Ariberto Pereira da Cunha, 333, Guaratinguetá, SP, 12.516-410, Brazil
| | - Juliano Fiorelli
- Research Nucleus On Materials for Biosystems (BioSMat), Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, 13635-900, Brazil
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Hasan NMS, Sobuz MHR, Shaurdho NMN, Meraz MM, Datta SD, Aditto FS, Kabbo MKI, Miah MJ. Eco-friendly concrete incorporating palm oil fuel ash: Fresh and mechanical properties with machine learning prediction, and sustainability assessment. Heliyon 2023; 9:e22296. [PMID: 38045200 PMCID: PMC10689959 DOI: 10.1016/j.heliyon.2023.e22296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 12/05/2023] Open
Abstract
Rising natural resource consumption leads to increased hazardous gas emissions, necessitating the concrete industry's focus on sustainable alternatives like palm oil fuel ash (POFA) to replace cement. Also, advanced machine learning (ML) techniques can uncover previously unreported insights about the effects of POFA that may be missing from the literature. Hence, this study investigates the influence of varying concentrations of POFA on fresh and mechanical characteristics with quantifying ML approaches and microstructural performance, as well as the environmental impact of structural concrete. For this, cement substitutions of 5 %, 15 %, 25 %, 35 %, and 45 % (by weight of cement) were utilized. POFA enhanced the overall concrete workability, with slump increments ranging from approximately 9 %-55 % and compacting factor increments of 4 %-12 %. Mechanical performance of POFA concrete improved up to 25 % replacement levels, with the highest enhancements observed in compressive (4.5 %), splitting tensile (36 %), and flexural (31 %) strength, for the mix containing 15 % POFA. The finer particle size of POFA improved microstructural performance by reducing porosity, aligning with the enhanced mechanical strength. The environmental impact of POFA was assessed by measuring eCO2 emissions, revealing a potential reduction of up to 44 %. Incorporating 5 %-15 % POFA yielded ideal mechanical performance results, significantly enhancing sustainability and cost-effectiveness. Regarding the ML approach, it can be observed that a low regression coefficient (R2) contrasts sharply with the higher R2 values for the random forest (RF) and the ensemble model, indicating satisfactory precision prediction with experimental results.
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Affiliation(s)
- Noor Md. Sadiqul Hasan
- Department of Civil Engineering, College of Engineering and Technology, International University of Business Agriculture and Technology, Dhaka 1230, Bangladesh
| | - Md. Habibur Rahman Sobuz
- Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Nur Mohammad Nazmus Shaurdho
- Department of Civil Engineering, College of Engineering and Technology, International University of Business Agriculture and Technology, Dhaka 1230, Bangladesh
| | - Md. Montaseer Meraz
- Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Shuvo Dip Datta
- Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Fahim Shahriyar Aditto
- Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Md. Kawsarul Islam Kabbo
- Department of Building Engineering and Construction Management, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
| | - Md Jihad Miah
- Department of Civil Engineering, University of Asia Pacific, Dhaka 1205, Bangladesh
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Zhou Y, Li M, Gao W, Li X, Long L, Hou X, Zhao J, Li S, Yuan X. Microstructure-united heterogeneous sodium alginate doped injectable hydrogel for stable hemostasis in dynamic mechanical environments. Int J Biol Macromol 2023; 248:125877. [PMID: 37481189 DOI: 10.1016/j.ijbiomac.2023.125877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/10/2023] [Accepted: 07/16/2023] [Indexed: 07/24/2023]
Abstract
Injectable hydrogels that can withstand compressive and tensile forces hold great promise for preventing rebleeding in dynamic mechanical environments after emergency hemostasis of wounds. However, current injectable hydrogels often lack sufficient compressive or tensile performance. Here, a microstructure-united heterogeneous injectable hydrogel (MH) was constructed. The heterogeneous structure endowed MH with a unique "microstructures consecutive transmission" feature, which allowed it to exhibit high compressive and tensile performance simultaneously. In this work, two types of sodium alginate doped hydrogels with different microstructures were physically smashed into microgels, respectively. By mixing the microgels, MH with one micro-pores featured microstructure and another nano-pores featured microstructure can be formed. The obtained MH can withstand both compressive and tensile forces and showed high mechanical performance (compressive modulus: 345.67 ± 10.12 kPa and tensile modulus: 245.19 ± 7.82 kPa). Furtherly, MH was proven to provide stable and sustained hemostasis in the dynamic mechanical environment. Overall, this work provided an effective strategy for constructing injectable hydrogel with high compressive and tensile performance for hemostasis in dynamic mechanical environments.
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Affiliation(s)
- Yuwei Zhou
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Meiru Li
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Weicheng Gao
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Xueping Li
- Tianjin Key Laboratory of Biomedical Materials, Key Laboratory of Biomaterials and Nanotechnology for Cancer Immunotherapy, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Lixia Long
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Xin Hou
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Jin Zhao
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Sidi Li
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, Shandong, China.
| | - Xubo Yuan
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
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11
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Essifi K, Brahmi M, Ed-Daoui A, Boussetta A, Benelmostafa M, Dahmani M, Salhi S, Moubarik A, El Bachiri A, Tahani A. Investigating the effect of clay content and type on the mechanical performance of calcium alginate-based hybrid bio-capsules. Int J Biol Macromol 2023; 242:125011. [PMID: 37217042 DOI: 10.1016/j.ijbiomac.2023.125011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/28/2023] [Accepted: 05/19/2023] [Indexed: 05/24/2023]
Abstract
This study aims to investigate the mechanical behavior of alginate-based simple and alginate@clay-based hybrid capsules under uniaxial compression using a Brookfield force machine. The effect of clay type and content on Young's modulus and nominal rupture stress of the capsules was investigated and characterized using Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (ATR-FTIR). Results showed that clay content improves the mechanical properties depending on its type. Montmorillonite and laponite clays showed optimal results at 3 wt% content, with a gain of 63.2 % and 70.34 % on Young's modulus, and a gain of 92.43 % and 108.66 % on nominal rupture stress, respectively, while kaolinite clay showed optimal results at 1.5 wt% content with an increase of 77.21 % on Young's modulus and 88.34 % on nominal rupture stress. However, exceeding the optimal content led to decrease the elasticity and rigidity due to the incomplete dispersion of clay particles in the hydrogel network. The theoretical modeling using Boltzmann superposition principle revealed that the elastic modulus was in good agreement with experimental values. Overall, this research provides insights into the mechanical behavior of alginate@clay-based capsules, which could have potential applications in drug delivery systems and tissue engineering.
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Affiliation(s)
- Kamal Essifi
- Physical Chemistry of Natural Resources and Process Team, Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Mohammed First University, Oujda, Morocco.
| | - Mohamed Brahmi
- Physical Chemistry of Natural Resources and Process Team, Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Mohammed First University, Oujda, Morocco
| | - Abderrahim Ed-Daoui
- Laboratory of Theoretical Physics, Particles Modeling, and Energetic, URAC 07, Faculty of Science, Mohammed First University Oujda, Morocco
| | - Abdelghani Boussetta
- Laboratory of Chemical Processes and Applied Materials Laboratory, Polydisciplinary Faculty, Sultan Moulay Slimane University, 23000 Beni-Mellal, Morocco
| | - M''hammed Benelmostafa
- Laboratory of Theoretical Physics, Particles Modeling, and Energetic, URAC 07, Faculty of Science, Mohammed First University Oujda, Morocco
| | - Mohammed Dahmani
- Laboratory of Theoretical Physics, Particles Modeling, and Energetic, URAC 07, Faculty of Science, Mohammed First University Oujda, Morocco
| | - Samira Salhi
- Physical Chemistry of Natural Resources and Process Team, Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Mohammed First University, Oujda, Morocco
| | - Amine Moubarik
- Laboratory of Chemical Processes and Applied Materials Laboratory, Polydisciplinary Faculty, Sultan Moulay Slimane University, 23000 Beni-Mellal, Morocco
| | - Ali El Bachiri
- Physical Chemistry of Natural Resources and Process Team, Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Mohammed First University, Oujda, Morocco
| | - Abdesselam Tahani
- Physical Chemistry of Natural Resources and Process Team, Laboratory of Applied Chemistry and Environment, Department of Chemistry, Faculty of Sciences, Mohammed First University, Oujda, Morocco.
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12
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de Medeiros Melo Neto O, de Figueiredo Lopes Lucena LC, Silva IM, de Figueiredo Lopes Lucena L, Mendonça AMGD, da Silva Lopes AM, da Silva FMM, de Amorim AG, de Oliveira Neto HR. Effects of the addition of fatty acid from soybean oil sludge in recycled asphalt mixtures. Environ Sci Pollut Res Int 2023; 30:50174-50197. [PMID: 36790704 DOI: 10.1007/s11356-023-25808-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 02/04/2023] [Indexed: 04/16/2023]
Abstract
Recycling agents provide better additions of reclaimed asphalt pavement (RAP) in the production of new asphalt mixtures. Alternative and residual materials that have the potential as asphalt binder viscosity reducers have gained visibility in the field of paving due to the perspective of circular economy in recycled mixtures. Soybean oil sludge fatty acid is a material produced from soybean oil sludge, a waste generated in the soybean oil refining step. Thus, this paper investigated the physical, chemical, and rheological effects of the asphalt binder PG 64-XX modified by the fatty acid of soybean oil sludge in the contents of 6% and 7% by weight of the binder. The modified binder samples were submitted to penetration tests, softening point, rotational viscosity, performance grade (PG), before and after short-term aging (RTFO), and multiple stress creep and recovery (MSCR). A control asphalt mixture and recycled asphalt mixtures produced with 40% RAP and fatty acid-modified binders were subjected to tensile strength, induced moisture damage, resilient modulus, and fatigue life. A Student's t statistical test verified the significance of the data, as well as the estimation of production costs of these asphalt mixtures. The use of the fatty acid significantly reduced the stiffness and viscosity of the control asphalt binder, decreasing the mixing temperatures at 14 °C and 17 °C to 6% and 7%, respectively. Using higher fatty acid contents from soybean oil sludge significantly improved the performance of recycled mixtures in tensile strength, moisture damage, and fatigue life. The production cost of recycled asphalt mixtures was lower than that of the control mixture.
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Affiliation(s)
- Osires de Medeiros Melo Neto
- Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil
| | | | - Ingridy Minervina Silva
- Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil
| | | | | | - Albaniza Maria da Silva Lopes
- Department of Civil Engineering, Federal University of Campina Grande, Aprígio Veloso 882, Campina Grande, PB, 58428-830, Brazil
| | | | - Alex Guedes de Amorim
- Department of Civil Engineering, State University of Paraíba, Pedro Targino, Araruna, 58233-000, Brazil
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Shi P, Zhang Y, Yan H, Zhang J, Gao D, Wang W. Evaluation of rheological and mechanical performance of gangue-based cemented backfill material: a novel hybrid machine learning approach. Environ Sci Pollut Res Int 2023; 30:55699-55715. [PMID: 36897447 DOI: 10.1007/s11356-023-26329-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
Waste discharge and surface damage are the unavoidable consequences of coal mining. However, filling waste into goaf can help reuse waste materials and protect the surface environment. In this paper, it is proposed to fill coal mine goaf with gangue-based cemented backfill material (GCBM), while the rheological and mechanical performances of GCBM influence the filling effect. A method that combines laboratory experiments and machine learning is proposed to predict the GCBM performance. The correlation and significance of eleven factors that affect GCBM are analyzed using random forest method, and the nonlinear effects of the main factors on the slump and uniaxial compressive strength (UCS) are analyzed. The optimization algorithm is improved, and the improved algorithm is combined with a support vector machine to build a hybrid model. The hybrid model is systematically verified and analyzed using predictions and convergence performances. The results demonstrate that the R2 of the predicted and measured values is 0.93 and the root mean square error is 0.1912, indicating that the improved hybrid model can effectively predict the slump and UCS and can promote sustainable waste use.
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Affiliation(s)
- Peitao Shi
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China.
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China.
| | - Yuzhe Zhang
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
| | - Hao Yan
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
| | - Jixiong Zhang
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
| | - Difa Gao
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
| | - Wenlong Wang
- School of Mines, China University of Mining and Technology, Xuzhou, 221116, China
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China
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14
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Li J, Cheng J, Hu X, Liu J, Tian Y, Wu G, Chen L, Zhang Y, Zhao G, Ni Z. A hazardous boundary of Poly(L-lactic acid) braided stent design: Limited elastic deformability of polymer materials. J Mech Behav Biomed Mater 2023; 138:105628. [PMID: 36543082 DOI: 10.1016/j.jmbbm.2022.105628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/12/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022]
Abstract
Poly (L-lactic acid) (PLLA) braided stents, which are expected to replace metal stents, are promising in peripheral vascular therapy due to their superior biocompatibility. Although various design ideas have been proposed and investigated on metal stents, few researches are related to the design theory of PLLA braided stent. In this article, mechanical performance of PLLA braided stents with different parameters was systematically evaluated, and a design theory based on material properties was proposed. Different from metal materials, the risk of filament deformation beyond elastic zone should be evaluated and controlled in PLLA stent design. The findings were obtained through combination study of experiments and simulations. Design parameters, including pitch angle and stent diameter, played a crucial role in mechanical performance of PLLA braided stent. The deformation of PLLA stents with larger pitch angles and stent diameters was in elastic zone and thus presented better mechanical performance with satisfactory resilience. This work could provide meaningful suggestions for preparing bioresorbable braided stents with suitable design parameters.
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15
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Vellaparambil R, Han WS, Di Giovanni P, Avril S. Potential of auxetic designs in endovascular aortic repair: A computational study of their mechanical performance. J Mech Behav Biomed Mater 2023; 138:105644. [PMID: 36608533 DOI: 10.1016/j.jmbbm.2022.105644] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/01/2022] [Accepted: 12/25/2022] [Indexed: 12/27/2022]
Abstract
With the rising popularity of endovascular aortic repair (EVAR) for aortic aneurysms and dissections, there is a crucial need for investigating the delayed appearance of post-EVAR complications such as stent-graft kinking, fracture and migration respectively. These complications have been noted to be influenced by the radial stiffness and bending flexibility attributes of stent-grafts. Auxetic designs with negative Poisson's ratio offer interesting advantages such as enhanced fracture toughness, superior indentation resistance and adaptive stiffness in response to intricate morphology for stenting applications over conventional stent designs. The objective of this study is to propose different auxetic stent candidates and to compare their mechanical performance with two conventional stent candidates for endovascular applications using numerical simulation through crimp/crushing tests for their radial stiffness and three-point bending/kinking tests for their flexibility, respectively. The results demonstrate that the novel hybrid auxetic designs (CRE and CSTAR) possess the best trade-off between radial stiffness and bending flexibility characteristics among all candidates for stent-graft applications.
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Affiliation(s)
- Rahul Vellaparambil
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, Etablissement Francais du Sang, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023, Saint-Etienne, France; R&D Department, HSL S.R.L, Trento, Italy
| | - Woo-Suck Han
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, Etablissement Francais du Sang, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023, Saint-Etienne, France
| | | | - Stéphane Avril
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, Etablissement Francais du Sang, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023, Saint-Etienne, France.
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16
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Pu M, Zhou X, Liu X, Fang C, Wang D. A facile, alternative and sustainable feedstock for transparent polyurethane elastomers from chemical recycling waste PET in high-efficient way. Waste Manag 2023; 155:137-145. [PMID: 36370623 DOI: 10.1016/j.wasman.2022.10.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 10/14/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Polymers with excellent optical and mechanical performance fabricated from renewable resources, have been paid an increasing attention in recent years. Here, high-performing polyurethane elastomers with significant mechanical properties, crystallinity, excellent stretchability and good transparency are prepared by a synergistic molecular design in the soft and hard segments. Using the liquid glycolysis degradation product (LGOP) as a chain extender, polyurethane elastomer is synthesized from polyethylene terephthalate (PET) waste bottles. The results suggest that the degradation products from waste PET can be directly used as feedstock for preparing polyurethane elastomers with significant performance. The polyurethanes exhibited excellent optical transparency of near 90%, and can be stretched up to 670% without any treatment to return to original size. It is assumed that the symmetrical hard domain composed of aromatic rings and ester groups in LGOP creates sufficient chain fluidity for the dynamic exchange of hydrogen bonds and urethane. This paper has devoted to achieve a complete and mature system from waste PET to polyurethane products, to create a closed loop of waste PET plastic recycling and regeneration, and to realize the polyurethane industrial chain of raw material self-supply.
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Affiliation(s)
- Mengyuan Pu
- School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China
| | - Xing Zhou
- School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China; Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, PR China.
| | - Xiaohui Liu
- Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, PR China
| | - Changqing Fang
- School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China
| | - Dong Wang
- School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, PR China
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17
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Altam AA, Zhu L, Wang W, Yagoub H, Yang S. Stability improvement of carboxymethyl cellulose/chitosan complex beads by thermal treatment. Int J Biol Macromol 2022; 223:1278-1286. [PMID: 36379283 DOI: 10.1016/j.ijbiomac.2022.11.089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 10/22/2022] [Accepted: 11/09/2022] [Indexed: 11/14/2022]
Abstract
Carboxymethyl cellulose (CMC) and chitosan (CHI) are two well-known natural polymer derivatives, as such the CMC@CHI complex beads fulfill many requirements for bio-related and safety-required applications. However, poor mechanical properties of CMC@CHI beads hinder their applications. We managed to improve the beads stability by a simple thermal treatment during the bead preparation. The effects of temperature, changing from 25 °C to 75 °C, on the stability of the formed beads were investigated. The morphology, diameter, shell thickness and structure of the beads treated at different temperature were analyzed using SEM, XPS and FTIR. The mechanical test and swelling experiments showed that the thermal treatment enhanced the bead's ability to withstand pressure and swelling. The beads treated at 75 °C showed the best pressure resistance, while the beads treated at 55 °C exhibited the highest swelling capability without losing integrity. This method is convenient to implement, not only improves the stability, but also controls the swelling capacity and mechanical properties of the beads, which are important for their potential applications in adsorption and controlled release. More importantly, this work offered insights on the effects of thermal treatment on the complexation process of the two polysaccharide molecular chains.
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Affiliation(s)
- Ali A Altam
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
| | - Liping Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China.
| | - Weijie Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
| | - Hajo Yagoub
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China
| | - Shuguang Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, Donghua University, Shanghai 201620, China.
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18
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Kang Y, Sun DH, Park JC, Kim J. Shape suitability and mechanical safety of customised hip implants: Three-dimensional printed acetabular cup for hip arthroplasty. J Orthop 2022; 34:166-172. [PMID: 36090783 PMCID: PMC9460813 DOI: 10.1016/j.jor.2022.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 07/29/2022] [Accepted: 08/07/2022] [Indexed: 11/27/2022] Open
Abstract
Background Owing to an increase in the number of hip arthroplasty surgeries, the number of implant replacement surgeries is increasing rapidly as well. This necessitates the study of hip joint conditions. Therefore, Paprosky defined a classification system to indicate the degree of damage to the hip joint. In this study, a customised hip implant suitable for Paprosky classification Type ⅡC and over was designed. The shape, suitability, and mechanical safety of the worst-case model for the implant were evaluated. Materials and methods To identify the implant size depending on states over Type ⅡC acetabulum bone loss, a size range was selected and a customised implant was designed according to the computed tomography data within the size range. The implant was designed for the flange, hook, and flattened model types. The worst-case selection test was conducted using finite element analysis. The von Mises stresses of the flange, hook, and flattened models were found as 76.223, 136.99, and 80.791 MPa, respectively. Therefore, the hook-type model was selected as the worst case for the mechanical performance test. Results A bending test was conducted on the hook-type model without fracture and failure at 5344.56 N. The proposed customised implant was found suitable for Type ⅢA acetabulum bone loss, whereas the shape suitability and mechanical safety were verified for the worst case. Conclusion The shape of a customised implant suitable for Paprosky ⅢA type was designed. The shape suitability and mechanical safety were evaluated using finite element method analysis and bending tests. Clinical validation is required through subsequent clinical evaluation.
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Affiliation(s)
- Yeokyung Kang
- Central Research & Development Center, Corentec Company Ltd., 33-2, Banpo-daero 20-gil, Seocho-gu, Seoul, Republic of Korea
- Cellbiocontrol Laboratory, Department of Medical Engineering, Yonsei University College of Medicine, 50-1 Yonsei-ro, Sinchon-dong, Seodaemun-gu, Seoul, Republic of Korea
| | - Doo-Hoon Sun
- Central Research & Development Center, Corentec Company Ltd., 33-2, Banpo-daero 20-gil, Seocho-gu, Seoul, Republic of Korea
- Department of Orthopaedic Surgery, Daejeon Sun Hospital, 10-7 Mok-dong, Jung-gu, Daejeon, Republic of Korea
| | - Jong-Chul Park
- Cellbiocontrol Laboratory, Department of Medical Engineering, Yonsei University College of Medicine, 50-1 Yonsei-ro, Sinchon-dong, Seodaemun-gu, Seoul, Republic of Korea
| | - Jungsung Kim
- Central Research & Development Center, Corentec Company Ltd., 33-2, Banpo-daero 20-gil, Seocho-gu, Seoul, Republic of Korea
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Yuan Y, Yu B, Wang W. The influence of poorly-/well-dispersed organo-montmorillonite on interfacial compatibility, fire retardancy and smoke suppression of polypropylene/intumescent flame retardant composite system. J Colloid Interface Sci 2022; 622:367-377. [PMID: 35525140 DOI: 10.1016/j.jcis.2022.04.101] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 04/14/2022] [Accepted: 04/17/2022] [Indexed: 10/18/2022]
Abstract
A novel linear polymeric charring agent (PEPAPC) was synthesized via the nucleophilic substitution reaction, and then embedded into polypropylene (PP) substrate to improve the fire retardancy and anti-dripping performance. Unfortunately, the opposite polarity between intumescent flame retardant (IFR) and polymer-matrix could seriously deteriorate the interfacial compatibility, harmful to the flame-retardant efficiency and smoke toxicity suppression of PP/IFR composites. For the foregoing reasons, flame retardant PP/IFR/Organo-montmorillonite (OMMT) nanocomposites with the combination of maleic anhydride-grafted PP as compatibilizer have been prepared via melt intercalation technique. When 2 wt% well-dispersed OMMT were incorporated, it showed a significant reduction in peak heat release rate and total heat release (90.5 and 62.7%) compared with pristine PP, and an achievement in limiting oxygen index value of 32% from 18.5% for pristine PP, which can be attributed to the nano-barrier and catalytic carbonization effect of well-dispersed OMMT within the polymer-matrix. More importantly, the well-dispersed OMMT displays significant smoke toxicity suppression, toughening and strengthening effect on PP/IFR system. The peak CO release and total smoke production for PP-6 were decreased by 89.8 and 64.7%, respectively. This work may provide an effective approach towards fabricating high-performance polymeric materials on organic/inorganic hybrid nanocomposites with homogenous dispersion, thereby effectively reducing the fire hazard risk.
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Affiliation(s)
- Yao Yuan
- Fujian Provincial Key Laboratory of Functional Materials and Applications, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, PR China
| | - Bin Yu
- State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China
| | - Wei Wang
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
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Li Y, Cui Z, Zhang H, Peng Z, Yan J, Lv B, Cui N. Effects of TiZn 3 and TiZn 16 components on the microstructure and mechanical performance of Ti-6Al-4 V alloy joints formed via ultrasonic assisted brazing using pre-galvanized workpieces. Ultrasonics 2022; 125:106782. [PMID: 35709574 DOI: 10.1016/j.ultras.2022.106782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 05/10/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
While the use of a Zn interlayer has been demonstrated to reduce the temperature required for joining easily oxidized metal alloys in atmospheric environments, the effects of reactions between the titanium alloy workpieces and the Zn interlayer on the mechanical performance of the finished joints are poorly understood. The present work addresses this issue by evaluating the chemical compositions at the interfaces of pre-galvanized Ti-6Al-4 V alloys joined at 420 °C in an atmospheric environment by ultrasonic-assisted brazing, and relating the observed compositions to the mechanical performances of the joints. The Ti-6Al-4 V alloy workpieces are first wetted by pure Zn using an ultrasonic assisted hot dip galvanizing (U-HDG). The obtained ultrasonic excitations are demonstrated to destroy the oxide film on the surfaces of the Ti-6Al-4 V workpieces and promote reactions between Ti and Zn at the interfaces. The plating of Zn on the workpiece surfaces is demonstrated to be realized by the formation of intermetallic compounds (IMCs) comprising a uniform TiZn3 layer in contact with the Ti-6Al-4 V surface, followed by a mixed TiZn3 + TiZn16 layer and a η-Zn layer at the outer surface. Application of the ultrasonic-assisted brazing process is demonstrated to maintain uniform TiZn3 layers next to the Ti-6Al-4 V surfaces, while the concentration of the TiZn16 phase near the midpoint of the joints increases with increasing ultrasonic treatment time (UST) from 5 s to 20 s, and the corresponding concentration of the η-Zn phase decreases. The results of mechanical testing demonstrate that the shear strength of the joint obtained with a TiZn3 layer thickness of 8-12 μm and a UST of 10 s is 210 MPa, which is 3.55 times greater than that obtained for joints processed without pre-galvanization.
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Affiliation(s)
- Yinan Li
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
| | - Zhuang Cui
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
| | - Hongchang Zhang
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
| | - Zilong Peng
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
| | - Jiuchun Yan
- State Key Laboratory of Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
| | - Binjiang Lv
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
| | - Ning Cui
- School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266000, China
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Wu JJ, Gao N, Jiang L, Zhong GJ, Deng C, Gao X. The coupling effect of cellulose nanocrystal and strong shear field achieved the strength and toughness balance of Polylactide. Int J Biol Macromol 2022; 207:927-940. [PMID: 35364194 DOI: 10.1016/j.ijbiomac.2022.03.172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/24/2022] [Accepted: 03/25/2022] [Indexed: 11/05/2022]
Abstract
Up to now, unbalanced mechanical properties and poor heat resistance have become two major problems of polylactic acid (PLA). In this study, the coupling between Cellulose nanocrystal (CNC) and strong shearing field formed a unique hierarchical structure. Compared with pure PLA, the tensile strength of DPIM PLA/CNC increased from 57.9 MPa to 79.6 MPa without sacrificing the toughness of PLA, and the vicat softening temperature of DPIM PLA/CNC increased from 60 °C to 155 °C. The microstructure of PLA/CNC composites was analyzed by SEM, SAXS and WAXD, and it was found that the coupling effect of CNC and strong shear flow field could significantly change the crystallization behavior of PLA. CNC could increase PLA shish length from 251 nm to 889 nm under the action of shear field. At the same time, due to this coupling effect, more PLA shish-kebab structures were induced at the interface. This special hierarchical structure composed of CNC and PLA Shish-Kebab is of great significance and can provide important guidance for achieving the balance of strength and toughness of polymer materials.
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Affiliation(s)
- Jun-Jun Wu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Ning Gao
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China; College of Materials and Engineering, Chongqing University of Technology, 400054 Chongqing, China
| | - Long Jiang
- Department of Mechanical Engineering, North Dakota State University, Fargo, USA
| | - Gan-Ji Zhong
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Cong Deng
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Xueqin Gao
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
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Cheng Y, Zang J, Zhao X, Wang H, Hu Y. Nanocellulose-enhanced organohydrogel with high-strength, conductivity, and anti-freezing properties for wearable strain sensors. Carbohydr Polym 2022; 277:118872. [PMID: 34893277 DOI: 10.1016/j.carbpol.2021.118872] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/17/2021] [Accepted: 11/05/2021] [Indexed: 12/15/2022]
Abstract
The use of ion-conductive hydrogels in strain sensors with high mechanical properties, conductivity, and anti-freezing properties is challenging. Here, high-strength, transparent, conductive, and anti-freezing organohydrogels were fabricated through the radical polymerization of polyacrylamide (PAM)/sodium alginate (SA)/TEMPO-oxidized cellulose nanofibrils (TOCNs) in a dimethyl sulfoxide (DMSO)/water solution, followed by soaking in a CaCl2 solution. The resulting organohydrogels demonstrated a high strength (tensile strength of 1.04 MPa), stretchability (681%), transparency (>84% transmittance), and ionic conductivity (1.25 S m-1). The organohydrogel-based strain sensor showed a high strain sensitivity (GF = 2.1). In addition, due to a synergistic effect between the DMSO/H2O binary solvent and CaCl2, the organohydrogel remained flexible (could bend 180°) and conductive (1.01 S m-1) at -20 °C. Interestingly, the TOCNs exerted a reinforcing effect on both the mechanical properties and ionic conductivity. This research provides a novel strategy to prepare ion-conductive organohydrogels with good mechanical properties, conductivity, and anti-freezing properties for use as flexible electronic materials.
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Shi X, He X, Sun L, Liu X. Influence of Defect Number, Distribution Continuity and Orientation on Tensile Strengths of the CNT-Based Networks: A Molecular Dynamics Study. Nanoscale Res Lett 2022; 17:15. [PMID: 35032241 PMCID: PMC8761213 DOI: 10.1186/s11671-022-03656-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Networks based on carbon nanotube (CNT) have been widely utilized to fabricate flexible electronic devices, but defects inevitably exist in these structures. In this study, we investigate the influence of the CNT-unit defects on the mechanical properties of a honeycomb CNT-based network, super carbon nanotube (SCNT), through molecular dynamics simulations. Results show that tensile strengths of the defective SCNTs are affected by the defect number, distribution continuity and orientation. Single-defect brings 0 ~ 25% reduction of the tensile strength with the dependency on defect position and the reduction is over 50% when the defect number increases to three. The distribution continuity induces up to 20% differences of tensile strengths for SCNTs with the same defect number. A smaller arranging angle of defects to the tensile direction leads to a higher tensile strength. Defective SCNTs possess various modes of stress concentration with different concentration degrees under the combined effect of defect number, arranging direction and continuity, for which the underlying mechanism can be explained by the effective crack length of the fracture mechanics. Fundamentally, the force transmission mode of the SCNT controls the influence of defects and the cases that breaking more force transmission paths cause larger decreases of tensile strengths. Defects are non-negligible factors of the mechanical properties of CNT-based networks and understanding the influence of defects on CNT-based networks is valuable to achieve the proper design of CNT-based electronic devices with better performances.
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Affiliation(s)
- Xian Shi
- School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
| | - Xiaoqiao He
- Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, 999077, Kowloon Tong, Hong Kong.
- Center for Advanced Structural Materials, City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China.
| | - Ligang Sun
- School of Science, Harbin Institute of Technology, Shenzhen, 518055, China
| | - Xuefeng Liu
- Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
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Li J, Zhang Z, Zhang Y, Sun F, Wang D, Wang H, Jin Z. Synergistic effect of lignin and ethylene glycol crosslinked epoxy resin on enhancing thermal, mechanical and shape memory performance. Int J Biol Macromol 2021; 192:516-24. [PMID: 34653437 DOI: 10.1016/j.ijbiomac.2021.10.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/30/2021] [Accepted: 10/06/2021] [Indexed: 11/21/2022]
Abstract
Lignosulfonate (LS) was successfully introduced into the epoxy resin matrix with the aid of ethylene glycol (EG) dissolution. Both the rigid LS and soft EG segments were linked into the cross-linked network structure of epoxy resin via esterification of hydroxyl groups in LS and EG molecules with anhydride. The ultimate properties of cured samples were adjusted effectively by changing the proportion of LS and EG components. Curing reaction and kinetics were analyzed, by which the optimal curing process parameters were determined. Although thermal stability of LS itself was relatively lower than that of neat epoxy, the thermal performance was significantly enhanced for the modified sample of epoxy/LS0.5-EG0.5. At the same time, the flexural strength, flexural modulus and impact strength were found to be increased by 23.1, 35.7 and 15.1% respectively compared with the neat epoxy. In addition, the excellent shape memory behavior and improved mechanical stability with LS addition were exhibited by the cured LS-EG modified specimens. This work reveals that lignin can be used as an efficient functional additive to regulate thermal, mechanical and shape memory properties of epoxy resin.
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Joseph A, Mahesh V, Harursampath D. On the application of additive manufacturing methods for auxetic structures: a review. Adv Manuf 2021; 9:342-368. [PMID: 34188969 PMCID: PMC8223767 DOI: 10.1007/s40436-021-00357-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 03/02/2021] [Accepted: 04/28/2021] [Indexed: 06/01/2023]
Abstract
Auxetic structures are a special class of structural components that exhibit a negative Poisson's ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the later-mentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.
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Affiliation(s)
- Athul Joseph
- Nonlinear Multifunctional Composites Analysis and Design (NMCAD) Laboratory, Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 560012 India
| | - Vinyas Mahesh
- Department of Mechanical Engineering, National Institute of Technology, Silchar, Assam 788010 India
| | - Dineshkumar Harursampath
- Nonlinear Multifunctional Composites Analysis and Design (NMCAD) Laboratory, Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 560012 India
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Geng L, Hu S, Cui M, Wu J, Huang A, Shi S, Peng X. Muscle-inspired double-network hydrogels with robust mechanical property, biocompatibility and ionic conductivity. Carbohydr Polym 2021; 262:117936. [PMID: 33838813 DOI: 10.1016/j.carbpol.2021.117936] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/23/2021] [Accepted: 03/10/2021] [Indexed: 12/13/2022]
Abstract
Inspired by muscle architectures, double network hydrogels with hierarchically aligned structures were fabricated, where cross-linked cellulose nanofiber (CNF)/chitosan hydrogel threads obtained by interfacial polyelectrolyte complexation spinning were collected in alignment as the first network, while isotropic poly(acrylamide-co-acrylic acid) (PAM-AA) served as the second network. After further cross-linking using Fe3+, the hydrogel showed an outstanding mechanical performance, owing to effective energy dissipation of the oriented asymmetric double networks. The average strength and elongation-at-break of PAM-AA/CNF/Fe3+ hydrogel were 11 MPa and 480 % respectively, which the strength was comparative to that of biological tissues. The aligned CNFs in the hydrogels provided probable ion transport channels, contributing to the high ionic conductivity, which was up to 0.022 S/cm when the content of LiCl was 1.5 %. Together with superior biocompatibility, the well-ordered hydrogel showed a promising potential in biological applications, such as artificial soft tissue materials and muscle-like sensors for human motion monitoring.
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Mehrabi P, Honarbari S, Rafiei S, Jahandari S, Alizadeh Bidgoli M. Seismic response prediction of FRC rectangular columns using intelligent fuzzy-based hybrid metaheuristic techniques. J Ambient Intell Humaniz Comput 2021; 12:10105-10123. [PMID: 33425053 PMCID: PMC7778570 DOI: 10.1007/s12652-020-02776-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 11/28/2020] [Indexed: 06/12/2023]
Abstract
This research study focused on the dynamic response and mechanical performance of fiber-reinforced concrete columns using hybrid numerical algorithms. Whereas test data has non-linearity, an artificial intelligence (AI) algorithm has been incorporated with different metaheuristic algorithms. About 317 datasets have been applied from the real test results to detect the promising factor of strength subjected to the seismic loads. Adaptive neuro-fuzzy inference system (ANFIS) was carried out as an AI beside the combination of particle swarm optimization (PSO) and genetic algorithm (GA). Extreme Machine Learning (ELM) was also performed in order to approve the obtained results. According to the findings, it is demonstrated that ANFIS-PSO predicts the lateral load with promising evaluation indexes [R2 (test) = 0.86, R2 (train) = 0.90]. Mechanical performance prediction was also carried out in this study, and the results showed that ELM predicts the compressive strength with promising evaluation indexes [R2 (test) = 0.66, R2 (train) = 0.86]. Finally, both ANFIS-GA and ANFIS-PSO techniques illustrated a reliable performance for prediction, which encourage scholars to replace costly and time-consuming experimental tests with predicting utilities.
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Affiliation(s)
- Peyman Mehrabi
- Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran
| | - Soheil Honarbari
- Department of Electrical Engineering, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
| | - Shervin Rafiei
- Department of Construction Engineering and Management, Amirkabir University of Technology, Tehran, Iran
| | - Soheil Jahandari
- Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751 Australia
| | - Mohsen Alizadeh Bidgoli
- Department of Electrical Engineering, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
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Wang Y, Müller WD, Rumjahn A, Schmidt F, Schwitalla AD. Mechanical properties of fused filament fabricated PEEK for biomedical applications depending on additive manufacturing parameters. J Mech Behav Biomed Mater 2020; 115:104250. [PMID: 33302091 DOI: 10.1016/j.jmbbm.2020.104250] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 11/30/2020] [Accepted: 12/03/2020] [Indexed: 11/24/2022]
Abstract
DESIGN of experiments was employed to investigate the combinations of 3D-printing parameters for Polyether ether ketone (PEEK) with a fused filament fabrication (FFF) process and to quantitatively evaluate the quality of 3D printed parts. This research was conducted using a newly developed FFF 3D printer and PEEK filament. Standard PEEK parts were 3D printed for bending and compression tests. Based on the Box-Behnken design, a three factors based experiment was designed using the Response Surface Methodology (RSM). Nozzle diameter, nozzle temperature and printing speed were involved. The density and dimensional accuracy of these printed parts were evaluated, and the bending and compression tests were conducted. The nozzle diameter was found to be the most significant parameter affecting the bending and compression performance of the printed PEEK samples, followed by printing speed and nozzle temperature. The highest accuracy in sample width was obtained with a 0.6 mm nozzle while the most accurate diameter was obtained with a 0.4 mm nozzle. A combination of a 0.4 mm nozzle diameter, 430 °C nozzle temperature and printing speed of 5 mm/s was beneficial to get the densest samples and therefore the highest bending strength; a reduction of internal defects was achieved with a 0.2 mm nozzle, a higher nozzle temperature of 440 °C and slower printing speed leading to better bending modulus. The best compression properties were achieved with a 0.6 mm nozzle, with relatively low influence of the other parameters. Different parameter combinations have been found to obtain optimal mechanical properties. Optimized parameters for better dimension accuracy of small additively manufactured PEEK parts were also achieved depending on the shape of the specimens.
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Affiliation(s)
- Yiqiao Wang
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany
| | - Wolf-Dieter Müller
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany
| | - Adam Rumjahn
- Orion Additive Manufacturing GmbH, Gustav-Meyer-Allee 25, 13355, Berlin, Germany
| | - Franziska Schmidt
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany
| | - Andreas Dominik Schwitalla
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany.
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Yang Y, Cheng Y, Peng S, Xu L, He C, Qi F, Zhao M, Shuai C. Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold. Bioact Mater 2021; 6:1230-41. [PMID: 33210021 DOI: 10.1016/j.bioactmat.2020.10.017] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/04/2020] [Accepted: 10/21/2020] [Indexed: 02/07/2023] Open
Abstract
Zinc (Zn) possesses desirable degradability and favorable biocompatibility, thus being recognized as a promising bone implant material. Nevertheless, the insufficient mechanical performance limits its further clinical application. In this study, reduced graphene oxide (RGO) was used as reinforcement in Zn scaffold fabricated via laser additive manufacturing. Results showed that the homogeneously dispersed RGO simultaneously enhanced the strength and ductility of Zn scaffold. On one hand, the enhanced strength was ascribed to (i) the grain refinement caused by the pinning effect of RGO, (ii) the efficient load shift due to the huge specific surface area of RGO and the favorable interface bonding between RGO and Zn matrix, and (iii) the Orowan strengthening by the homogeneously distributed RGO. On the other hand, the improved ductility was owing to the RGO-induced random orientation of grain with texture index reducing from 20.5 to 7.3, which activated more slip systems and provided more space to accommodate dislocation. Furthermore, the cell test confirmed that RGO promoted cell growth and differentiation. This study demonstrated the great potential of RGO in tailoring the mechanical performance and cell behavior of Zn scaffold for bone repair. Zn/RGO composite scaffold was successfully fabricated by laser additive manufacturing. RGO refined the grains and significantly weakened the texture with random grain orientation. The uniformly distributed RGO simultaneously enhanced the strength and ductility of scaffold. The incorporated RGO exerted a positive effect on cell growth and differentiation.
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Shi YB, Gong J, Hu XY, Ju X. Comparative investigation on the thermostability, sensitivity, and mechanical performance of RDX/HMX energetic cocrystal and its mixture. J Mol Model 2020; 26:176. [PMID: 32535754 DOI: 10.1007/s00894-020-04426-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 05/18/2020] [Indexed: 11/27/2022]
Abstract
Molecular mechanics (MM) and molecular dynamics (MD) simulation method were applied to explore the impact of temperature (220-380 K) on the thermostability, sensitivity, and mechanical performance of RDX (1,3,5-trinitro-1,3,5-triazacyco-hexane)/HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazocane) energetic cocrystal and mixture models. The mechanical property, the maximum trigger bond length ([Formula: see text]), binding energy, and cohesive energy density (CED) of the pure RDX, β-HMX crystal, the cocrystal, and mixture models were acquired and compared. The results manifest that temperature has an important impact on the binding capacity between the components of the cocrystal and mixture. The binding energies decrease as the temperature rises, and the cocrystal has larger values than those of mixture. For all the models, the [Formula: see text] increases and the CEDs decrease with the rising temperature, implying that the sensitivity of the explosives increases, while the [Formula: see text] values of the cocrystal are smaller than those of HMX and the CED values are between those of RDX and β-HMX, indicating that the sensitivity has been enhanced through co-crystallization. As the temperature increases, the shear modulus (G), bulk modulus (K), and tensile modulus (E) values of all models have an evident downtrend. Simultaneously, G, K, and E values of the cocrystal model are less than those of RDX and β-HMX, while the K/G ratio and Cauchy pressure (C12-C44) are larger, signifying that co-crystallization can weaken the brittleness and enhance the ductility of the pure crystals. Compared with the mixture, the cocrystal has better ductility and stability.
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Key Words
- 1,3,5-trinitro-1,3,5-triazacyco-hexane (RDX)/1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) energetic cocrystal
- Mechanical performance
- Molecular dynamics simulation
- Sensitivity
- Thermostability
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Liu J, Chen P, Qin D, Jia S, Jia C, Li L, Bian H, Wei J, Shao Z. Nanocomposites membranes from cellulose nanofibers, SiO 2 and carboxymethyl cellulose with improved properties. Carbohydr Polym 2020; 233:115818. [PMID: 32059879 DOI: 10.1016/j.carbpol.2019.115818] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 12/21/2019] [Accepted: 12/30/2019] [Indexed: 01/13/2023]
Abstract
The binary nanocomposites blended by carboxymethyl cellulose (CMC) and SiO2 nanoparticles were constructed to prepare the films with superior thermal stability and flame retardant properties. The incorporation of cellulose nanofibers(CNFs) and SiO2 nanoparticles were followed to prepare ternary nanocomposite films exhibiting excellent mechanical properties. The mechanism and chemical reaction of the thermal decomposition for the CMC/SiO2 composite membrane were proposed, which showed that the mass residuals were Na2CO3, SiO2 and Na2SiO3, Na2CO3 when the content of the SiO2 nanoparticles was lowered and higher than 9.6 %, respectively. Compared with the pure CMC, micro combustion calorimeter (MCC) showed that the total heat release (THR) and the peak heat release rate (PHRR) both decreased from 6.4 kJ/g to 5.8 kJ/g, 134 w/g to 27 w/g, respectively. Moreover, mechanical properties of CMC/CNFs/SiO2 membrane showed that the toughness and rigidity of the nanocomposites increased by 56.0 % and 63.0 % on the basis of CMC, respectively.
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Affiliation(s)
- Jianxin Liu
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Pan Chen
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Dujian Qin
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Shuai Jia
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Chao Jia
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
| | - Lei Li
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Hongli Bian
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Jie Wei
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China
| | - Ziqiang Shao
- Beijing Engineering Research Centre of Cellulose and Its Derivatives, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
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Cristelo N, Segadães L, Coelho J, Chaves B, Sousa NR, de Lurdes Lopes M. Recycling municipal solid waste incineration slag and fly ash as precursors in low-range alkaline cements. Waste Manag 2020; 104:60-73. [PMID: 31962218 DOI: 10.1016/j.wasman.2020.01.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/07/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
Application of municipal solid waste incineration (MSWI) products - fly ash (MSW-FA) and bottom ash (MSW-BA), is increasingly popular, mostly due to the need to reintroduce it in the industrial chain, but also because its technical performance is constantly enhanced by a growing research effort. This paper deals with the less popular application of these wastes without the addition of a more competent precursor. Several pastes based on MSW-FA, MSW-BA or MSW-FA+MSW-BA were prepared, using sodium silicate or sodium hydroxide. Their overall performance was then assessed through mechanical (uniaxial compressive strength - UCS and seismic wave velocity), environmental (leaching) and durability tests (freeze-thaw and wetting-drying). Cement stabilised MSW-BA pastes were also tested, for reference. Results showed that a preliminary mechanical activation, achieved by milling, is fundamental; the activation with silicate is more effective than with hydroxide, especially in the case of the MSW-BA pastes, when the UCS values are more than triplicated (3-10 MPa); the MSW-BA is a more competent precursor than the MSW-FA and the durability and leachability of the alkali activated pastes is similar to that obtained with cement. The most performing paste, in terms of UCS, was obtained with BA activated exclusively with sodium silicate, with an activator/precursor weight ratio of 0.5. In general, the low-cost solidification/stabilisation proposed in this study showed competitive with the alternative use of up to 30% cement and should be regarded as a valid alternative for simple storage or low-range applications, in substitution of Portland cement.
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Affiliation(s)
- Nuno Cristelo
- CQ-VR, Department of Engineering, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal.
| | - Luis Segadães
- Department of Engineering, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal.
| | - João Coelho
- Department of Civil Engineering, University of Minho, 4800-058 Guimarães, Portugal.
| | - Benedita Chaves
- LIPOR, Intermunicipal Waste Management of Greater Porto, 4435-996 Baguim do Monte, Portugal.
| | - Nadine R Sousa
- LIPOR, Intermunicipal Waste Management of Greater Porto, 4435-996 Baguim do Monte, Portugal.
| | - Maria de Lurdes Lopes
- CONSTRUCT, Department of Civil Engineering, University of Porto, 4200-465 Porto, Portugal.
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Liang J, Li J, Zhou C, Jia W, Song H, Zhang L, Zhao F, Lee BP, Liu B. In situ synthesis of biocompatible imidazolium salt hydrogels with antimicrobial activity. Acta Biomater 2019; 99:133-140. [PMID: 31539654 DOI: 10.1016/j.actbio.2019.09.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 09/04/2019] [Accepted: 09/12/2019] [Indexed: 11/25/2022]
Abstract
Infection with antibiotic-resistant bacteria is becoming a significant public health risk. In this study, we synthesized a series of imidazolium salt (IMS)-containing polymers and hydrogels and tested their antimicrobial properties against both gram-positive (Staphylococcus aureus and MRSA) and gram-negative (Escherichia coli and PA01) bacteria. IMSs were either grafted as side chains or functionalized in the main chain of linear polymers, which demonstrated antimicrobial properties with minimum inhibitory concentrations as low as 2 μg/mL. Similarly, the optimized IMS-containing hydrogel effectively killed MRSA with a 96.1% killing efficiency and inhibited the growth of PA01. These hydrogels also demonstrated high performance in terms of mechanical property (compressive strength >2 MPa) and were noncytotoxic toward human dermal fibroblasts. STATEMENT OF SIGNIFICANCE: A series of polyimidazolium hydrogels were fabricated with acrylamide monomer and poly(ethylene glycol) dimethacrylate by thermal-initiated polymerization. These hydrogels completely killed methicillin-resistant Staphylococcus aureus and inhibited the growth of Pseudomonas aeruginosa. More importantly, these hydrogels demonstrated adequate mechanical property and biocompatibility. These antimicrobial hydrogels have the potential as biomaterials for preventing infections associated with multidrug-resistant bacteria.
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Rashid K, Hameed R, Ahmad HA, Razzaq A, Ahmad M, Mahmood A. Analytical framework for value added utilization of glass waste in concrete: Mechanical and environmental performance. Waste Manag 2018; 79:312-323. [PMID: 30343760 DOI: 10.1016/j.wasman.2018.07.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/15/2018] [Accepted: 07/31/2018] [Indexed: 05/29/2023]
Abstract
This work was designed to incorporate glass waste as partial replacement of coarse aggregate in concrete through optimization of its amount by assessment of mechanical and environmental performances. Fresh and hardened properties of glass waste concrete were evaluated and compared with the conventional concrete. Moreover, compressive strength was evaluated experimentally as well as analytically at different ages. While, environmental performance was evaluated with an assessment of CO2 footprint and volume utilization of raw materials for both types of concrete; conventional and glass waste concrete. Consequently, a sustainable concrete was selected that possesses high workability and mechanical performance, minimum CO2 footprint and least utilization of conventional natural raw materials. For optimization, corresponding values of designed parameters were translated into a framework for glass waste management by application of analytical hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS). Similar prioritization for all types of mixtures was achieved through proposed framework by applying such multi criteria decision making techniques. Proposed framework may further be used for adjusting the priority weights for each criterion according to the requirement as well as for extended evaluation of additional criteria.
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Affiliation(s)
- Khuram Rashid
- Department of Architectural Engineering and Design, University of Engineering & Technology Lahore, Pakistan.
| | - Rizwan Hameed
- Department of Civil Engineering, University of South Asia, Lahore, Pakistan
| | - Hafiz Abrar Ahmad
- Department of Architectural Engineering and Design, University of Engineering & Technology Lahore, Pakistan
| | - Afia Razzaq
- Department of Architectural Engineering and Design, University of Engineering & Technology Lahore, Pakistan
| | - Madiha Ahmad
- Department of Architecture, University of Lahore, Pakistan; Department of Architectural Engineering and Design, University of Engineering & Technology Lahore, Pakistan
| | - Alina Mahmood
- Department of Architectural Engineering and Design, University of Engineering & Technology Lahore, Pakistan
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Tamura M, Monzen H, Matsumoto K, Kubo K, Otsuka M, Inada M, Doi H, Ishikawa K, Nakamatsu K, Sumida I, Mizuno H, Yoon DK, Nishimura Y. Mechanical performance of a commercial knowledge-based VMAT planning for prostate cancer. Radiat Oncol 2018; 13:163. [PMID: 30170614 PMCID: PMC6119260 DOI: 10.1186/s13014-018-1114-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/23/2018] [Indexed: 12/03/2022] Open
Abstract
Background This study clarified the mechanical performance of volumetric modulated arc therapy (VMAT) plans for prostate cancer generated with a commercial knowledge-based treatment planning (KBP) and whether KBP system could be applied clinically without any major problems with mechanical performance. Methods Thirty consecutive prostate cancer patients who underwent VMAT using extant clinical plans were evaluated. The mechanical performance and dosimetric accuracy of the single optimized KBPs, which were trained with other 51 clinical plans, were compared with the clinical plans. The mechanical performance metrics were mean field area (MFA), mean asymmetry distance (MAD), cross-axis score (CAS), closed leaf score (CLS), small aperture score (SAS), leaf travel (LT), modulation complexity score (MCSv), and monitor unit (MU). The γ passing rates were evaluated with ArcCheck and EBT3 film. Results The mean mechanical performance metrics (clinical plan vs. KBP) were as follows: 18.28 cm2 vs. 17.25 cm2 (MFA), 21.08 mm vs. 20.47 mm (MAD), 0.54 vs. 0.55 (CAS), 0.040 vs. 0.051 (CLS), 0.20 vs. 0.23 (SAS5mm), 458.5 mm vs. 418.8 mm (LT), 0.27 vs. 0.27 (MCSv), and 618.2 vs. 622.1 (MU), respectively. Significant differences were observed for CLS and LT. The average γ passing rates (clinical plan vs. KBP) were as follows: 99.0% vs. 99.1% (3%/3 mm) and 92.4% vs. 92.5% (2%/2 mm) with ArcCHeck, and 99.5% vs. 99.4% (3%/3 mm) and 95.2% vs. 95.4% (2%/2 mm) with EBT3 film, respectively. Conclusions The KBP used lower multileaf collimator (MLC) travel and more closed or small MLC apertures than the clinical plan. The KBP system of VMAT for the prostate cancer was acceptable for clinical use without any major problems.
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Affiliation(s)
- Mikoto Tamura
- Department of Medical Physics, Graduate School of Medical Science, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Hajime Monzen
- Department of Medical Physics, Graduate School of Medical Science, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan.
| | - Kenji Matsumoto
- Department of Medical Physics, Graduate School of Medical Science, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Kazuki Kubo
- Department of Medical Physics, Graduate School of Medical Science, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Masakazu Otsuka
- Department of Medical Physics, Graduate School of Medical Science, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Masahiro Inada
- Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Hiroshi Doi
- Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Kazuki Ishikawa
- Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Kiyoshi Nakamatsu
- Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
| | - Iori Sumida
- Department of Radiation Oncology, Graduate School of Medicine, Osaka University, 2-2, Yamada-oka, Suita, Osaka, 565-0071, Japan
| | - Hirokazu Mizuno
- Department of Radiation Oncology, Graduate School of Medicine, Osaka University, 2-2, Yamada-oka, Suita, Osaka, 565-0071, Japan
| | - Do-Kun Yoon
- Department of Biomedical Engineering and Research Institute of Biomedical Engineering, College of Medicine, Catholic University of Korea, 505, Banpo-dong, Seocho-gu, Seoul, 137-701, Korea
| | - Yasumasa Nishimura
- Department of Radiation Oncology, Faculty of Medicine, Kindai University, 377-2, Ohno-Higashi, Osakasayama, Osaka, 589-8511, Japan
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Qian L, Lei D, Duan X, Zhang S, Song W, Hou C, Tang R. Design and preparation of metal-organic framework papers with enhanced mechanical properties and good antibacterial capacity. Carbohydr Polym 2018; 192:44-51. [PMID: 29691033 DOI: 10.1016/j.carbpol.2018.03.049] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 03/14/2018] [Accepted: 03/16/2018] [Indexed: 12/20/2022]
Abstract
In this study, a biodegradable paper-based composite with good mechanical and antibacterial properties was obtained by first reinforcing the cotton pulp-based paper with carboxylated cellulose nanofiber (CNF) via the Williamson reaction, followed by in situ generating zeolitic imidazolate framework-67 (ZIF-67) nanoparticles on the surface of the resulting cellulosic material. The mechanical properties and antibacterial activities of the resulting composite were investigated. The tensile testing demonstrated that the composites prepared with 2.5 wt% CNF exhibited outstanding mechanical performance under dry and wet conditions with the tensile strength values of 17.20 and 1.90 MPa, respectively, approximately 1.3 and 11 times higher compared to that of the original cellulose paper. Furthermore, the antibacterial experiments showed that the composites exhibited significant bacteriostasis, and the antibacterial properties increased significantly with increasing ZIF-67 loading in the composites. Consequently, this biodegradable composite could be potentially used in the field of medical and health security.
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Affiliation(s)
- Liwei Qian
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
| | - Dan Lei
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Xiao Duan
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
| | - Sufeng Zhang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
| | - Wenqi Song
- Key Laboratory of Organic Polymer Photoelectric Materials, School of Science, Xijing University, Xi'an 710123, China
| | - Chen Hou
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Ruihua Tang
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
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Abstract
Additive manufacturing (3D printing) has found many applications in healthcare including fabrication of biomaterials as well as bioprinting of tissues and organs. Additively manufactured (AM) biomaterials may possess arbitrarily complex micro-architectures that give rise to novel mechanical, physical, and biological properties. The mechanical behavior of such porous biomaterials including their quasi-static mechanical properties and fatigue resistance is not yet well understood. It is particularly important to understand the relationship between the designed micro-architecture (topology) and the resulting mechanical properties. The current special issue is dedicated to understanding the mechanical behavior of AM biomaterials. Although various types of AM biomaterials are represented in the special issue, the primary focus is on AM porous metallic biomaterials. As a prelude to this special issue, this editorial reviews some of the latest findings in the mechanical behavior of AM porous metallic biomaterials so as to describe the current state-of-the-art and set the stage for the other studies appearing in the issue. Some areas that are important for future research are also briefly mentioned.
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Affiliation(s)
- Amir A Zadpoor
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft 2628 CD, The Netherlands.
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Kou L, Liu Y, Zhang C, Shao L, Tian Z, Deng Z, Gao C. A Mini Review on Nanocarbon-Based 1D Macroscopic Fibers: Assembly Strategies and Mechanical Properties. Nanomicro Lett 2017; 9:51. [PMID: 30393746 PMCID: PMC6199052 DOI: 10.1007/s40820-017-0151-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 07/11/2017] [Indexed: 05/29/2023]
Abstract
Nanocarbon-based materials, such as carbon nanotubes (CNTs) and graphene have been attached much attention by scientific and industrial community. As two representative nanocarbon materials, one-dimensional CNTs and two-dimensional graphene both possess remarkable mechanical properties. In the past years, a large amount of work have been done by using CNTs or graphene as building blocks for constructing novel, macroscopic, mechanically strong fibrous materials. In this review, we summarize the assembly approaches of CNT-based fibers and graphene-based fibers in chronological order, respectively. The mechanical performances of these fibrous materials are compared, and the critical influences on the mechanical properties are discussed. Personal perspectives on the fabrication methods of CNT- and graphene-based fibers are further presented.
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Affiliation(s)
- Liang Kou
- Shaanxi Coal and Chemical Technology Institute Co., Ltd, 2 Jinye Road 1, Xi’an, 710070 People’s Republic of China
| | - Yingjun Liu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027 People’s Republic of China
| | - Cheng Zhang
- Shaanxi Coal and Chemical Technology Institute Co., Ltd, 2 Jinye Road 1, Xi’an, 710070 People’s Republic of China
| | - Le Shao
- Shaanxi Coal and Chemical Technology Institute Co., Ltd, 2 Jinye Road 1, Xi’an, 710070 People’s Republic of China
| | - Zhanyuan Tian
- Shaanxi Coal and Chemical Technology Institute Co., Ltd, 2 Jinye Road 1, Xi’an, 710070 People’s Republic of China
| | - Zengshe Deng
- Shaanxi Coal and Chemical Technology Institute Co., Ltd, 2 Jinye Road 1, Xi’an, 710070 People’s Republic of China
| | - Chao Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027 People’s Republic of China
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620 People’s Republic of China
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Sormunen LA, Kolisoja P. Construction of an interim storage field using recovered municipal solid waste incineration bottom ash: Field performance study. Waste Manag 2017; 64:107-116. [PMID: 28325702 DOI: 10.1016/j.wasman.2017.03.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 01/26/2017] [Accepted: 03/08/2017] [Indexed: 06/06/2023]
Abstract
The leaching of hazardous substances from municipal solid waste incineration (MSWI) bottom ash (BA) has been studied in many different scales for several years. Less attention has been given to the mechanical performance of MSWI BA in actual civil engineering structures. The durability of structures built with this waste derived material can have major influence on the functional properties of such structures and also the potential leaching of hazardous substances in the long term. Hence, it is necessary to properly evaluate in which type of structures MSWI BA can be safely used in a similar way as natural and crushed rock aggregates. In the current study, MSWI BA treated with ADR (Advance Dry Recovery) technology was used in the structural layers of an interim storage field built within a waste treatment centre. During and half a year after the construction, the development of technical and mechanical properties of BA materials and the built structures were investigated. The aim was to compare these results with the findings of laboratory studies in which the same material was previously investigated. The field results showed that the mechanical performance of recovered BA corresponds to the performance of natural aggregates in the lower structural layers of field structures. Conversely, the recovered MSWI BA cannot be recommended to be used in the base layers as such, even though its stiffness properties increased over time due to material aging and changes in moisture content. The main reason for this is that BA particles are prone for crushing and therefore inadequate to resist the higher stresses occurring in the upper parts of road and field structures. These results were in accordance with the previous laboratory findings. It can thus be concluded that the recovered MSWI BA is durable to be used as a replacement of natural aggregates especially in the lower structural layers of road and field structures, whereas if used in the base layers, an additional base layer of natural aggregate or a thicker asphalt pavement is recommended.
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Affiliation(s)
| | - Pauli Kolisoja
- Tampere University of Technology, P.O. Box 600, FI-33101 Tampere, Finland
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Wang X, Li Y, Liu Q, Chen Q, Xia Q, Zhao P. In vivo effects of metal ions on conformation and mechanical performance of silkworm silks. Biochim Biophys Acta Gen Subj 2016; 1861:567-576. [PMID: 27865996 DOI: 10.1016/j.bbagen.2016.11.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 11/02/2016] [Accepted: 11/15/2016] [Indexed: 12/28/2022]
Abstract
BACKGROUND The mechanism of silk fiber formation is of particular interest. Although in vitro evidence has shown that metal ions affect conformational transitions of silks, the in vivo effects of metal ions on silk conformations and mechanical performance are still unclear. METHODS This study explored the effects of metal ions on silk conformations and mechanical properties of silk fibers by adding K+ and Cu2+ into the silk fibroin solutions or injecting them into the silkworms. Aimed by CD analysis, FTIR analysis, and mechanical testing, the conformational and mechanical changes of the silks were estimated. By using BION Web Server, the interactions of K+ and N-terminal of silk fibroin were also simulated. RESULTS We presented that K+ and Cu2+ induced the conformational transitions of silk fibroin by forming β-sheet structures. Moreover, the mechanical parameters of silk fibers, such as strength, toughness and Young's modulus, were also improved after K+ or Cu2+ injection. Using BION Web Server, we found that potassium ions may have strong electrostatic interactions with the negatively charged residues. CONCLUSION We suggest that K+ and Cu2+ play crucial roles in the conformation and mechanical performances of silks and they are involved in the silk fiber formation in vivo. GENERAL SIGNIFICANCE Our results are helpful for clarifying the mechanism of silk fiber formation, and provide insights for modifying the mechanical properties of silk fibers.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, PR China; Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing 400716, PR China
| | - Yi Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, PR China
| | - Qingsong Liu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, PR China
| | - Quanmei Chen
- Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, PR China
| | - Qingyou Xia
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, PR China; Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing 400716, PR China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, PR China; Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing 400716, PR China.
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Shemtov-Yona K, Rittel D. Random spectrum loading of dental implants: An alternative approach to functional performance assessment. J Mech Behav Biomed Mater 2016; 62:1-9. [PMID: 27161957 DOI: 10.1016/j.jmbbm.2016.04.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 03/17/2016] [Accepted: 04/21/2016] [Indexed: 11/24/2022]
Abstract
The fatigue performance of dental implants is usually assessed on the basis of cyclic S/N curves. This neither provides information on the anticipated service performance of the implant, nor does it allow for detailed comparisons between implants unless a thorough statistical analysis is performed, of the kind not currently required by certification standards. The notion of endurance limit is deemed to be of limited applicability, given unavoidable stress concentrations and random load excursions, that all characterize dental implants and their service conditions. We propose a completely different approach, based on random spectrum loading, as long used in aeronautical design. The implant is randomly loaded by a sequence of loads encompassing all load levels it would endure during its service life. This approach provides a quantitative and comparable estimate of its performance in terms of lifetime, based on the very fact that the implant will fracture sooner or later, instead of defining a fatigue endurance limit of limited practical application. Five commercial monolithic Ti-6Al-4V implants were tested under cyclic, and another 5 under spectrum loading conditions, at room temperature and dry air. The failure modes and fracture planes were identical for all implants. The approach is discussed, including its potential applications, for systematic, straightforward and reliable comparisons of various implant designs and environments, without the need for cumbersome statistical analyses. It is believed that spectrum loading can be considered for the generation of new standardization procedures and design applications.
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Affiliation(s)
- K Shemtov-Yona
- Faculty of Mechanical Engineering Technion, 32000 Haifa, Israel.
| | - D Rittel
- Faculty of Mechanical Engineering Technion, 32000 Haifa, Israel
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Rennerfeldt DA, Renth AN, Talata Z, Gehrke SH, Detamore MS. Tuning mechanical performance of poly(ethylene glycol) and agarose interpenetrating network hydrogels for cartilage tissue engineering. Biomaterials 2013; 34:8241-57. [PMID: 23932504 PMCID: PMC3773240 DOI: 10.1016/j.biomaterials.2013.07.052] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 07/18/2013] [Indexed: 10/26/2022]
Abstract
Hydrogels are attractive for tissue engineering applications due to their incredible versatility, but they can be limited in cartilage tissue engineering applications due to inadequate mechanical performance. In an effort to address this limitation, our team previously reported the drastic improvement in the mechanical performance of interpenetrating networks (IPNs) of poly(ethylene glycol) diacrylate (PEG-DA) and agarose relative to pure PEG-DA and agarose networks. The goal of the current study was specifically to determine the relative importance of PEG-DA concentration, agarose concentration, and PEG-DA molecular weight in controlling mechanical performance, swelling characteristics, and network parameters. IPNs consistently had compressive and shear moduli greater than the additive sum of either single network when compared to pure PEG-DA gels with a similar PEG-DA content. IPNs withstood a maximum stress of up to 4.0 MPa in unconfined compression, with increased PEG-DA molecular weight being the greatest contributing factor to improved failure properties. However, aside from failure properties, PEG-DA concentration was the most influential factor for the large majority of properties. Increasing the agarose and PEG-DA concentrations as well as the PEG-DA molecular weight of agarose/PEG-DA IPNs and pure PEG-DA gels improved moduli and maximum stresses by as much as an order of magnitude or greater compared to pure PEG-DA gels in our previous studies. Although the viability of encapsulated chondrocytes was not significantly affected by IPN formulation, glycosaminoglycan (GAG) content was significantly influenced, with a 12-fold increase over a three-week period in gels with a lower PEG-DA concentration. These results suggest that mechanical performance of IPNs may be tuned with partial but not complete independence from biological performance of encapsulated cells.
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Affiliation(s)
- Deena A Rennerfeldt
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, KS 66045, USA
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