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Shanmugathasan S, Bagur A, Ducrot E, Buffière S, van Oostrum P, Ravaine S, Duguet E. Silica/polystyrene bipod-like submicron colloids synthesized by seed-growth dispersion polymerisation as precursors for two-patch silica particles. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Goyal RK, Agrawal R, Bhargava AK. Poly(ether-ketone) (PEK)/ceramic nanocomposites as alternate materials for printed circuit board application. POLYM-PLAST TECH MAT 2022. [DOI: 10.1080/25740881.2021.1995415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Affiliation(s)
- R. K. Goyal
- Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, India
| | - R. Agrawal
- Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, India
| | - A. K. Bhargava
- Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur, India
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3
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Enhanced Bioactivity of Micropatterned Hydroxyapatite Embedded Poly(L-lactic) Acid for a Load-Bearing Implant. Polymers (Basel) 2020; 12:polym12102390. [PMID: 33080777 PMCID: PMC7603062 DOI: 10.3390/polym12102390] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 10/12/2020] [Accepted: 10/15/2020] [Indexed: 12/02/2022] Open
Abstract
Poly(L-lactic) acid (PLLA) is among the most promising polymers for bone fixation, repair, and tissue engineering due to its biodegradability and relatively good mechanical strength. Despite these beneficial characteristics, its poor bioactivity often requires incorporation of bioactive ceramic materials. A bioresorbable composite made of PLLA and hydroxyapatite (HA) may improve biocompatibility but typically causes deterioration in mechanical properties, and bioactive coatings inevitably carry a risk of coating delamination. Therefore, in this study, we embedded micropatterned HA on the surface of PLLA to improve bioactivity while eliminating the risk of HA delamination. An HA pattern was successfully embedded in a PLLA matrix without degeneration of the matrix’s mechanical properties, thanks to a transfer technique involving conversion of Mg to HA. Furthermore, patterned HA/PLLA’s biological response outperformed that of pure PLLA. These results confirm patterned HA/PLLA as a candidate for wide acceptance in biodegradable load-bearing implant applications.
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4
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Liu C, Feng S, Zhu Z, Chen Q, Noh K, Kotaki M, Sue HJ. Manipulation of Fracture Behavior of Poly(methyl methacrylate) Nanocomposites by Interfacial Design of a Metal-Organic-Framework Nanoparticle Toughener. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11938-11947. [PMID: 32940475 DOI: 10.1021/acs.langmuir.0c02029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The interfacial region between nanoparticles and polymer matrix plays a critical role in influencing the mechanical behavior of polymer nanocomposites. In this work, a set of model systems based on poly(methyl methacrylate) (PMMA) matrix containing poly(alkyl glycidyl ether) brushes grafted on 50 nm metal-organic-framework (MOF) nanoparticles were synthesized and investigated. By systematically increasing the polymer brush length and graft density on the MOF nanoparticles, the fracture behavior of PMMA/MOF nanocomposite changes from forming only a few large crazes to generating massive crazing and to undergoing shear banding, which results in significant improvement in fracture toughness. The implication of the present finding for the interfacial design of the nanoparticles for the development of high-performance, multifunctional polymer nanocomposites is discussed.
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Affiliation(s)
- Cong Liu
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Sinan Feng
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Zewen Zhu
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Qihui Chen
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Kwanghae Noh
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Masaya Kotaki
- Kaneka US Materials Research Center, Fremont, California 94555, United States
| | - Hung-Jue Sue
- Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
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5
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Mubarak S, Dhamodharan D, Divakaran N, Kale MB, Senthil T, Wu L, Wang J. Enhanced Mechanical and Thermal Properties of Stereolithography 3D Printed Structures by the Effects of Incorporated Controllably Annealed Anatase TiO 2 Nanoparticles. NANOMATERIALS 2020; 10:nano10010079. [PMID: 31906295 PMCID: PMC7022956 DOI: 10.3390/nano10010079] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 12/15/2019] [Accepted: 12/25/2019] [Indexed: 12/22/2022]
Abstract
Fabrication of low-cost, durable and efficient metal oxide nanocomposites were successfully synthesized and reinforced with photo-resin via 3-dimensional printing. Here, we put forward a novel approach to enhance the mechanical and thermal behaviors of stereolithography (SLA) 3D printed architecture by adding TiO2 nanoparticles (TNPs) in different crystalline phases (anatase and rutile), which were obtained at different annealing temperatures from 400 °C to 1000°C. The heat-treated anatase TNPs were scrutinized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, diffusive reflectance spectroscopy (DRS), and transmission electron microscopy (TEM) analysis. Among all the samples, at 800 °C, annealed anatase TNPs exposed a highly crystalline anatase phase, having a low energy bandgap and a comparably high tensile strength (47.43 MPa) and high elastic modulus (2.261 GPa) for the 3D printed samples, showing improvement by 103% and 32%, respectively, compared with the printed pristine stereolithography resin (SLR) sample. Moreover, enhanced storage modulus and tan δ values were achieved via the better interfacial interactions between the incorporated nanofillers and the SLR matrix. In addition to this, enhanced thermal conductivity and thermal stability of the SLR matrix were also noted. The low energy bandgap and nanoscale size of the fillers helped to achieve good dispersion and allowed the UV light to penetrate at a maximum depth through the photo resin.
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Affiliation(s)
- Suhail Mubarak
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Duraisami Dhamodharan
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Nidhin Divakaran
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Manoj B. Kale
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - T. Senthil
- Advanced Research School for Technology and Product Simulation, Central Institute of Plastics Engineering and Technology, Chennai 600032, India;
| | - Lixin Wu
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- Correspondence: (L.W.); (J.W.)
| | - Jianlei Wang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China; (S.M.); (D.D.); (N.D.); (M.B.K.)
- Correspondence: (L.W.); (J.W.)
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6
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Elmadani AA, Radović I, Tomić NZ, Petrović M, Stojanović DB, Heinemann RJ, Radojević V. Hybrid denture acrylic composites with nanozirconia and electrospun polystyrene fibers. PLoS One 2019; 14:e0226528. [PMID: 31851701 PMCID: PMC6919599 DOI: 10.1371/journal.pone.0226528] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 11/29/2019] [Indexed: 12/13/2022] Open
Abstract
The processing and characterization of hybrid PMMA resin composites with nano-zirconia (ZrO2) and electrospun polystyrene (PS) polymer fibers were presented in this study. Reinforcement was selected with the intention to tune the physical and mechanical properties of the hybrid composite. Surface modification of inorganic particles was performed in order to improve the adhesion of reinforcement to the matrix. Fourier transform infrared spectroscopy (FTIR) provided successful modification of zirconia nanoparticles with 3-Methacryloxypropyltrimethoxysilane (MEMO) and bonding improvement between incompatible inorganic nanoparticles and PMMA matrix. Considerable deagglomeration of nanoparticles in the matrix occurred after the modification has been revealed by scanning electron microscopy (SEM). Microhardness increased with the concentration of modified nanoparticles, while the fibers were the modifier that lowers hardness and promotes toughness of hybrid composites. Impact test displayed increased absorbed energy after the PS electrospun fibers had been embedded. The optimized composition of the hybrid was determined and a good balance of thermal and mechanical properties was achieved.
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Affiliation(s)
- A A Elmadani
- University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
| | - I Radović
- University of Belgrade, Laboratory for Materials Sciences, Institute of Nuclear Sciences ''Vinča", Belgrade, Serbia
| | - N Z Tomić
- Innovation Center of Faculty of Technology and Metallurgy in Belgrade, Belgrade, Serbia
| | - M Petrović
- University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
| | - D B Stojanović
- University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
| | - R Jančić Heinemann
- University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
| | - V Radojević
- University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
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7
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Tan G, Zhang J, Zheng L, Jiao D, Liu Z, Zhang Z, Ritchie RO. Nature-Inspired Nacre-Like Composites Combining Human Tooth-Matching Elasticity and Hardness with Exceptional Damage Tolerance. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1904603. [PMID: 31713926 DOI: 10.1002/adma.201904603] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/24/2019] [Indexed: 06/10/2023]
Abstract
Making replacements for the human body similar to natural tissue offers significant advantages but remains a key challenge. This is pertinent for synthetic dental materials, which rarely reproduce the actual properties of human teeth and generally demonstrate relatively poor damage tolerance. Here new bioinspired ceramic-polymer composites with nacre-mimetic lamellar and brick-and-mortar architectures are reported, which resemble, respectively, human dentin and enamel in hardness, stiffness, and strength and exhibit exceptional fracture toughness. These composites are additionally distinguished by outstanding machinability, energy-dissipating capability under cyclic loading, and diminished abrasion to antagonist teeth. The underlying design principles and toughening mechanisms of these materials are elucidated in terms of their distinct architectures. It is demonstrated that these composites are promising candidates for dental applications, such as new-generation tooth replacements. Finally, it is believed that this notion of bioinspired design of new materials with unprecedented biologically comparable properties can be extended to a wide range of material systems for improved mechanical performance.
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Affiliation(s)
- Guoqi Tan
- Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
- School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Jian Zhang
- Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Long Zheng
- Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, 130022, China
| | - Da Jiao
- Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Zengqian Liu
- Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
- School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Zhefeng Zhang
- Laboratory of Fatigue and Fracture for Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
- School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
| | - Robert O Ritchie
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, CA, 94720, USA
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8
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Szałaj U, Świderska-Środa A, Chodara A, Gierlotka S, Łojkowski W. Nanoparticle Size Effect on Water Vapour Adsorption by Hydroxyapatite. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1005. [PMID: 31336907 PMCID: PMC6669690 DOI: 10.3390/nano9071005] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/06/2019] [Accepted: 07/10/2019] [Indexed: 01/31/2023]
Abstract
Handling and properties of nanoparticles strongly depend on processes that take place on their surface. Specific surface area and adsorption capacity strongly increase as the nanoparticle size decreases. A crucial factor is adsorption of water from ambient atmosphere. Considering the ever-growing number of hydroxyapatite nanoparticles applications, we decided to investigate how the size of nanoparticles and the changes in relative air humidity affect adsorption of water on their surface. Hydroxyapatite nanoparticles of two sizes: 10 and 40 nm, were tested. It was found that the nanoparticle size has a strong effect on the kinetics and efficiency of water adsorption. For the same value of water activity, the quantity of water adsorbed on the surface of 10 nm nano-hydroxyapatite was five times greater than that adsorbed on the 40 nm. Based on the adsorption isotherm fitting method, it was found that a multilayer physical adsorption mechanism was active. The number of adsorbed water layers at constant humidity strongly depends on particles size and reaches even 23 layers for the 10 nm particles. The amount of water adsorbed on these particles was surprisingly high, comparable to the amount of water absorbed by the commonly used moisture-sorbent silica gel.
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Affiliation(s)
- Urszula Szałaj
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland.
- Faculty of Materials Engineering, Warsaw University of Technology, Wołoska 41, 02-507 Warsaw, Poland.
| | - Anna Świderska-Środa
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland
| | - Agnieszka Chodara
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland
- Faculty of Materials Engineering, Warsaw University of Technology, Wołoska 41, 02-507 Warsaw, Poland
| | - Stanisław Gierlotka
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland
| | - Witold Łojkowski
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokołowska 29/37, 01-142 Warsaw, Poland
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9
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Gong S, Chen H, Zhou X, Gunasekaran S. Synthesis and applications of MANs/poly(MMA-co-BA) nanocomposite latex by miniemulsion polymerization. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170844. [PMID: 29291076 PMCID: PMC5717650 DOI: 10.1098/rsos.170844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 09/26/2017] [Indexed: 05/15/2023]
Abstract
We have synthesized core-shell structured 3-methacryloxypropyltrimethoxysilane (MPS) functionalized antimony-doped tin oxide nanoparticles (MANs)-poly(methyl methacrylate-co-butyl acrylate) (PMMA-co-BA, PMB) nanocomposite latex particles via miniemulsion polymerization method. Polymerizable anionic surfactant DNS-86 (allyloxy polyoxyethylene(10) nonyl ammonium sulfate) was first introduced to synthesize core-shell nanocomposite. The morphologies of synthesized MANs and MANs/PMB latex nanocomposite particles were studied with transmission electron microscopy, which revealed particles, on average 70 nm in size, with a core-shell structure. Owing to the uniformity and hydrophobicity of MANs, the MANs-embedded PMB latex nanocomposite can be tailored more precisely than other nanoparticles-embedded nanocomposites. Films incorporating 10 wt% of MANs in the MAN/PMB latex nanocomposite exhibit good transmittance in the visible region, and excellent opacity in the near infrared region. The MANs/PMB nanocomposite film also appears suitable for heat insulation applications.
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Affiliation(s)
- Sheng Gong
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, People's Republic of China
- Department of Biological Systems Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA
- Authors for correspondence: Sheng Gong e-mail:
| | - Huayao Chen
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, People's Republic of China
| | - Xinhua Zhou
- School of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, People's Republic of China
- Authors for correspondence: Xinhua Zhou e-mail:
| | - Sundaram Gunasekaran
- Department of Biological Systems Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA
- Authors for correspondence: Sundaram Gunasekaran e-mail:
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10
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Jennings AR, McCollum J, Wilkins AJ, Manni S, Iacono ST. Synthesis and characterization of partially fluorinated aerogels and xerogels from environmentally-compatible precursors. RSC Adv 2017. [DOI: 10.1039/c7ra02016c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new fluorocyclic monomer, prepared from environmentally benign starting materials, was used to synthesize the first known fluorocyclic aero- and xerogels.
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Affiliation(s)
- Abby R. Jennings
- Department of Chemistry
- Chemistry Research Center
- United States Air Force Academy
- Colorado Springs
- USA
| | - Jena McCollum
- Department of Chemistry
- Chemistry Research Center
- United States Air Force Academy
- Colorado Springs
- USA
| | - Adam J. Wilkins
- Department of Chemistry
- Chemistry Research Center
- United States Air Force Academy
- Colorado Springs
- USA
| | - Stacy M. Manni
- Air Force Research Laboratory
- Munitions Directorate
- Ordinance Division
- Energetic Materials Branch
- Eglin Air Force Base
| | - Scott T. Iacono
- Department of Chemistry
- Chemistry Research Center
- United States Air Force Academy
- Colorado Springs
- USA
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11
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Li Z, Liu J, Yuan Y, Li E, Wang F. Effects of surface fluoride-functionalizing of glass fiber on the properties of PTFE/glass fiber microwave composites. RSC Adv 2017. [DOI: 10.1039/c7ra02715j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The two-step method of grafting fluorine on the surface of glass fiber improves the interfacial connection of PTFE/glass-fiber microwave composites.
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Affiliation(s)
- Zhenhua Li
- School of Material Science and Engineering
- Southwest University of Science and Technology
- Mianyang 621010
- China
| | - Jingsong Liu
- School of Material Science and Engineering
- Southwest University of Science and Technology
- Mianyang 621010
- China
| | - Ying Yuan
- The State Key Laboratory of Electronic Thin Films and Integrated Devices
- University of Electronic Science and Technology of China
- Chengdu 610054
- China
| | - Enzhu Li
- The State Key Laboratory of Electronic Thin Films and Integrated Devices
- University of Electronic Science and Technology of China
- Chengdu 610054
- China
| | - Fu Wang
- School of Material Science and Engineering
- Southwest University of Science and Technology
- Mianyang 621010
- China
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12
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Sun H, Xu Y, Zhou Y, Gao W, Zhao H, Wang W. Preparation of superhydrophobic nanocomposite fiber membranes by electrospinning poly(vinylidene fluoride)/silane coupling agent modified SiO2nanoparticles. J Appl Polym Sci 2016. [DOI: 10.1002/app.44501] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Haixiang Sun
- College of Science; China University of Petroleum (East China); Qingdao 266580 China
- State Key Laboratory of Heavy Oil Processing; China University of Petroleum, (East China); Qingdao 266580 China
| | - Yanyan Xu
- College of Science; China University of Petroleum (East China); Qingdao 266580 China
| | - Yingying Zhou
- State Key Laboratory of Heavy Oil Processing; China University of Petroleum, (East China); Qingdao 266580 China
| | - Wen Gao
- College of Science; China University of Petroleum (East China); Qingdao 266580 China
| | - Haoru Zhao
- College of Science; China University of Petroleum (East China); Qingdao 266580 China
| | - Wenguang Wang
- College of Science; China University of Petroleum (East China); Qingdao 266580 China
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13
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The effect of polymer grafting in the dispersibility of alumina/polysulfone nanocomposites. Macromol Res 2016. [DOI: 10.1007/s13233-016-4150-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Jennings AR, Budy SM, Thrasher CJ, Iacono ST. Synthesis of fluorinated silica nanoparticles containing latent reactive groups for post-synthetic modification and for tunable surface energy. NANOSCALE 2016; 8:16212-16220. [PMID: 27430324 DOI: 10.1039/c6nr04829c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A new PFCP-based chlorosilane monomer containing a latent reactive fluorine atom was synthesized utilizing a hydrosilylation reaction. This monomer was used to functionalize Stöber silica nanoparticles, or network silicas, and the ability to tailor the properties of the functionalized nanoparticles was investigated by reacting the latent reactive fluorinated alkene with various nucleophiles. In order to model the chemical transformations occuring with the PFCP-functionalized particles, a new PFCP-containing molecular silica was prepared using a hydrosilylation reaction. The molecular silica was designed such that it contained a latent reactive fluorine atom and could also undergo post-synthetic modifications with various nucleophiles. The ability to modify the latent reactive group and tune the properties of the molecular and network silicas was verified by multi-nuclear NMR ((1)H, (13)C, (19)F, and (29)Si), thermal characterizations, and by investigating the hydrophobicity and surface morphology of spin-cast films prepared from the molecular and network silicas.
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Affiliation(s)
- Abby R Jennings
- Department of Chemistry & Chemistry Research Center, United States Air Force Academy, Colorado Springs, CO 80919 USA.
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15
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Rezabeigi E, Wood-Adams PM, Drew RAL. Morphological examination of highly porous polylactic acid/Bioglass ® scaffolds produced via nonsolvent induced phase separation. J Biomed Mater Res B Appl Biomater 2016; 105:2433-2442. [PMID: 27640880 DOI: 10.1002/jbm.b.33784] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 08/11/2016] [Accepted: 08/22/2016] [Indexed: 11/08/2022]
Abstract
In this study, we produce highly porous (up to ∼91%) composite scaffolds of polylactic acid (PLA) containing 2 wt % sol-gel-derived 45S5 Bioglass® particles via nonsolvent induced phase separation at -23°C with no sacrificial phases involved. Before the incorporation of the bioglass with PLA, the particles are surface modified with a silane coupling agent which effectively diminishes agglomeration between them leading to a better dispersion of bioactive particles throughout the scaffold. Interestingly, the incorporation route (via solvent dichloromethane or nonsolvent hexane) of the surface modified particles in the foaming process has the greatest impact on porosity, crystallinity, and morphology of the scaffolds. The composite scaffolds with a morphology consisting of both mesopores and large macropores, which is potentially beneficial for bone regeneration applications, are examined further. SEM images show that the surface modified bioglass particles take-up a unique configuration within the mesoporous structure of these scaffolds ensuring that the particles are well interlocked but not completely covered by PLA such that they can be in contact with physiological fluids. The results of preliminary in vitro tests confirm that this PLA/bioglass configuration promotes the interaction of the bioactive phase with physiological fluids. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 2433-2442, 2017.
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Affiliation(s)
- Ehsan Rezabeigi
- Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
| | - Paula M Wood-Adams
- Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
| | - Robin A L Drew
- Department of Mechanical and Industrial Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
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16
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Lee DG, An SY, Um MS, Choi WJ, Noh SM, Jung HW, Oh JK. Photo-induced thiol-ene crosslinked polymethacrylate networks reinforced with Al2O3 nanoparticles. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.08.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Kaizer MR, Almeida JR, Gonçalves APR, Zhang Y, Cava SS, Moraes RR. Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials. J Dent Res 2016; 95:1394-1400. [PMID: 27470069 DOI: 10.1177/0022034516662022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This study was designed to develop and characterize a silica-coating method for crystalline nonsilicate ceramic nanoparticles (Al2O3, TiO2, and ZrO2). The hypothesis was that the coated nonsilicate nanoparticles would stably reinforce a polymeric matrix due to effective silanation. Silica coating was applied via a sol-gel method, with tetraethyl orthosilicate as a silica precursor, followed by heat treatment. The chemical and microstructural characteristics of the nanopowders were evaluated before and after silica coating through x-ray diffraction, BET (Brunauer-Emmett-Teller), energy-dispersive x-ray spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analyses. Coated and noncoated nanoparticles were silanated before preparation of hybrid composites, which contained glass microparticles in addition to the nanoparticles. The composites were mechanically tested in 4-point bending mode after aging (10,000 thermal cycles). Results of all chemical and microstructural analyses confirmed the successful obtaining of silica-coated nanoparticles. Two distinct aspects were observed depending on the type of nanoparticle tested: 1) formation of a silica shell on the surface of the particles and 2) nanoparticle clusters embedded into a silica matrix. The aged hybrid composites formulated with the coated nanoparticles showed improved flexural strength (10% to 30% higher) and work of fracture (35% to 40% higher) as compared with composites formulated with noncoated nanoparticles. The tested hypothesis was confirmed: silanated silica-coated nonsilicate nanoparticles yielded stable reinforcement of dimethacrylate polymeric matrix due to effective silanation. The silica-coating method presented here is a versatile and promising novel strategy for the use of crystalline nonsilicate ceramics as a reinforcing phase of polymeric composite biomaterials.
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Affiliation(s)
- M R Kaizer
- 1 Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - J R Almeida
- 1 Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - A P R Gonçalves
- 1 Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - Y Zhang
- 2 College of Dentistry, New York University, New York, NY, USA
| | - S S Cava
- 3 School of Materials Engineering, Federal University of Pelotas, Pelotas, Brazil
| | - R R Moraes
- 1 Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil
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Marei NN, Nassar NN, Vitale G. The effect of the nanosize on surface properties of NiO nanoparticles for the adsorption of Quinolin-65. Phys Chem Chem Phys 2016; 18:6839-49. [DOI: 10.1039/c6cp00001k] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using Quinolin-65 (Q-65) as a model-adsorbing compound for polar heavy hydrocarbons, the nanosize effect of NiO nanoparticles on the adsorption of Q-65 was investigated.
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Affiliation(s)
- Nedal N. Marei
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
- Department of Chemical Engineering
| | - Nashaat N. Nassar
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
| | - Gerardo Vitale
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
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19
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Hmoudah M, Nassar NN, Vitale G, El-Qanni A. Effect of nanosized and surface-structural-modified nano-pyroxene on adsorption of violanthrone-79. RSC Adv 2016. [DOI: 10.1039/c6ra05838h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A new environmentally sound and low-cost yet highly efficient pyroxene nanoparticles employed for the first time as nanoadsorbents for violanthrone-79.
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Affiliation(s)
- Maryam Hmoudah
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
- Department of Chemical Engineering
| | - Nashaat N. Nassar
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
| | - Gerardo Vitale
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
| | - Amjad El-Qanni
- Department of Chemical and Petroleum Engineering
- University of Calgary
- Calgary
- Canada
- Department of Chemical Engineering
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20
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Liu D, Pourrahimi A, Olsson R, Hedenqvist M, Gedde U. Influence of nanoparticle surface treatment on particle dispersion and interfacial adhesion in low-density polyethylene/aluminium oxide nanocomposites. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.01.046] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Zheng X, Zhang Y, Wang H, Du Q. Interconnected Macroporous Polymers Synthesized from Silica Particle Stabilized High Internal Phase Emulsions. Macromolecules 2014. [DOI: 10.1021/ma501253u] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Xianhua Zheng
- State Key Laboratory of Molecular
Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China
| | - Yi Zhang
- State Key Laboratory of Molecular
Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China
| | - Haitao Wang
- State Key Laboratory of Molecular
Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China
| | - Qiangguo Du
- State Key Laboratory of Molecular
Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China
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22
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Generation of nanocomposites based on (PMMA-b-PCL)-grafted Fe2O3 nanoparticles and PS-b-PCL block copolymer. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.06.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Parpaite T, Otazaghine B, Taguet A, Sonnier R, Caro A, Lopez-Cuesta J. Incorporation of modified Stöber silica nanoparticles in polystyrene/polyamide-6 blends: Coalescence inhibition and modification of the thermal degradation via controlled dispersion at the interface. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.04.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Wåhlander M, Nilsson F, Larsson E, Tsai WC, Hillborg H, Carlmark A, Gedde UW, Malmström E. Polymer-grafted Al2O3-nanoparticles for controlled dispersion in poly(ethylene-co-butyl acrylate) nanocomposites. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.03.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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25
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Synthesis of 45S5 Bioglass® via a straightforward organic, nitrate-free sol-gel process. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 40:248-52. [PMID: 24857490 DOI: 10.1016/j.msec.2014.03.042] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 02/07/2014] [Accepted: 03/18/2014] [Indexed: 12/25/2022]
Abstract
More than four decades after the discovery of 45S5 Bioglass® as the first bioactive material, this composition is still one of the most promising materials in the tissue engineering field. Sol-gel-derived bioactive glasses generally possess improved properties over other bioactive glasses, because of their highly porous microstructure and unique surface chemistry which accelerate hydroxyapatite formation. In the current study, a new combination of precursors with lactic acid as the hydrolysis catalyst have been employed to design an organic, nitrate-free sol-gel procedure for synthesizing of 45S5 Bioglass®. This straightforward route is able to produce fully amorphous submicron particles of this glass with an appropriately high specific surface area on the order of ten times higher than that of the melt-derived glasses. These characteristics are expected to lead to rapid hydroxyapatite formation and consequently more efficient bone bonding.
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26
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Muir BVO, Myung D, Knoll W, Frank CW. Grafting of cross-linked hydrogel networks to titanium surfaces. ACS APPLIED MATERIALS & INTERFACES 2014; 6:958-966. [PMID: 24364560 DOI: 10.1021/am404361v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The performance of medical implants and devices is dependent on the biocompatibility of the interfacial region between tissue and the implant material. Polymeric hydrogels are attractive materials for use as biocompatible surface coatings for metal implants. In such systems, a factor that is critically important for the longevity of an implant is the formation of a robust bond between the hydrogel layer and the implant metal surface and the ability for this assembly to withstand physiological conditions. Here, we describe the grafting of cross-linked hydrogel networks to titanium surfaces using grit-blasting and subsequent chemical functionalization using a silane-based adhesion promoter. Metal surface characterization was carried out using profilometry, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) analysis. Hydrogel layers composed of poly(ethylene glycol)-dimethacrylate (PEG-DMA), poly(2-hydroxyethylmethacrylate) (PHEMA), or poly(ethylene glycol)/poly(acrylic acid) (PEG/PAA) semi-interpenetrating polymer networks (semi-IPNs) have been prepared. The mechanical properties of these hydrogel-metal assemblies have been characterized using lap-shear measurements, and the surface morphology was studied by SEM and EDX. We have shown that both high surface roughness and chemical functionalization are critical for adhesion of the hydrogel layer to the titanium substrate.
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Affiliation(s)
- Beinn V O Muir
- Department of Chemical Engineering, Stanford University , 381 North-South Mall, Stauffer III, Stanford, California 94305-5025, United States
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27
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He W, Wu D, Li J, Zhang K, Xiang Y, Long L, Qin S, Yu J, Zhang Q. Surface Modification of Colloidal Silica Nanoparticles: Controlling the size and Grafting Process. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.9.2747] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Zhang J, Jiang L, Pan K, Yi Z, Dan Y. Controlled polymerization of methylmethacrylate from fumed SiO2
nanoparticles through atom transfer radical polymerization. POLYM INT 2013. [DOI: 10.1002/pi.4514] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Juan Zhang
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment; Chinese Academy of Sciences; Xiamen 361021 China
| | - Long Jiang
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Kai Pan
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Zheng Yi
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
| | - Yi Dan
- State Key Laboratory of Polymer Materials Engineering; Polymer Research Institute of Sichuan University; Chengdu 610065 China
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29
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Lopes P, Garcia MP, Fernandes MH, Fernandes MHV. Properties and osteoblast cytocompatibility of self-curing acrylic cements modified by glass fillers. J Biomater Appl 2012; 28:498-513. [PMID: 22918184 DOI: 10.1177/0885328212457097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Materials filled with a silicate glass (MSi) and a borate glass (MB) were developed and compared in terms of their in vitro behavior. The effect of filler composition and concentration (0, 30, 40 and 50 wt%) on the curing parameters, residual monomer, water uptake, weight loss, bioactivity, mechanical properties (bending and compression) and osteoblast cytocompatibility was evaluated. The addition of bioactive glass filler significantly improved the cements curing parameters and the mechanical properties. The most relevant results were obtained for the lower filler concentration (30 t%) a maximum flexural strength of 40.4 Pa for MB3 and a maximum compressive strength of 95.7 MPa for MSi3. In vitro bioactivity in acellular media was enhanced by the higher glass contents in the cements. Regarding the biological assessment, the incorporation of the silicate glass significantly improved osteoblast cytocompatibility, whereas the presence of the borate glass resulted in a poor cell response. Nevertheless it was shown that the surviving cells on the MB surface were in a more differentiated stage compared to those growing over non-filled poly(methyl methacrylate). Results suggest that the developed formulations offer a high range of properties that might be interesting for their use as self-curing cements.
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Affiliation(s)
- P Lopes
- 1Centre for Research in Ceramic and Composite Materials CICECO and Department of Ceramics and Glass Engineering, University of Aveiro, Campus Universitário de Santiago, Aveiro, Portugal
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30
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Ament KA, Kessler MR, Akinc M. Cyanate ester-alumina nanoparticle suspensions: Effect of alumina concentration on viscosity and cure behavior. POLYM ENG SCI 2011. [DOI: 10.1002/pen.21859] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Gupta S, Ramamurthy PC, Madras G. Synthesis and characterization of flexible epoxy nanocomposites reinforced with amine functionalized aluminananoparticles: a potential encapsulant for organic devices. Polym Chem 2011. [DOI: 10.1039/c0py00270d] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Gupta S, Ramamurthy PC, Madras G. Synthesis and characterization of silicone polymer/functionalized mesostructured silica composites. Polym Chem 2011. [DOI: 10.1039/c1py00316j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Sudhakaran U, Freris I, Geppi M, Borsacchi S, Cristofori D, Riello P, Benedetti A. A multinuclear solid-state magnetic resonance study on submicrometer-sized SiO2 particles encapsulated by a PMMA shell. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.08.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Gurevitch I, Silverstein MS. Polymerized pickering HIPEs: Effects of synthesis parameters on porous structure. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23911] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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35
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Poly(methyl methacrylate) (PMMA)-based hybrid materials with reactive zirconium oxide nanocrystals. Polym J 2010. [DOI: 10.1038/pj.2009.309] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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Colilla M, Aranda P, Darder M, Ruiz-Hitzky E. Silacrown modified xerogels as functional hybrid materials for carbon composite electrodes. CR CHIM 2010. [DOI: 10.1016/j.crci.2009.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Sheng X, Akinc M, Kessler MR. The effects of alumina and silica nanoparticles on the cure kinetics of bisphenol E cyanate ester. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21638] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Novel strategy for tailoring of SiO2 and TiO2 nanoparticle surfaces with poly(ε-caprolactone). Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2167-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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39
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40
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Sheng X, Akinc M, Kessler MR. Rheology and dynamic mechanical analysis of bisphenol E cyanate ester/alumina nanocomposites. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21543] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Pardal F, Lapinte V, Robin JJ. Modification of silica nanoparticles by grafting of copolymers containing organosilane and fluorine moities. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23513] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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42
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Chung JW, Kim SH, Jung SJ, Kwak SY. Encapsulation of β-cyclodextrin by in situ polymerization with vinyl chloride leading to suppressing the migration of endocrine disrupting phthalate plasticizer. Eur Polym J 2009. [DOI: 10.1016/j.eurpolymj.2009.05.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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43
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Zhou X, Wu T, Hu B, Jiang T, Han B. Ru nanoparticles stabilized by poly(N-vinyl-2-pyrrolidone) grafted onto silica: Very active and stable catalysts for hydrogenation of aromatics. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2009.03.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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44
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Haman K, Badrinarayanan P, Kessler MR. Effect of a zirconium tungstate filler on the cure behavior of a cyanate ester resin. ACS APPLIED MATERIALS & INTERFACES 2009; 1:1190-1195. [PMID: 20355912 DOI: 10.1021/am900051g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work, the effect of a negative thermal expansion zirconium tungstate (ZrW2O8) filler on the cure behavior of a unique low-viscosity bisphenol E cyanate ester (BECy) is characterized by differential scanning calorimetry. The cure rate of BECy is found to increase upon the incorporation of ZrW2O8 particles, and the catalytic effect increases with increasing filler loading. The catalytic effect is primarily attributed to the presence and nature of hydroxyl groups on the ZrW2O8 particle surface. In comparison with BECy/ZrW2O8 composites of the same loading, silane-coated ZrW2O8 particles resulted in a higher value of the glass transition temperature (T(g)) and a delay in the onset of the cure. The ability of a phenomenological reaction model to describe the cure behavior of the composites is also examined.
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Affiliation(s)
- K Haman
- Department of Materials Science and Engineering, Iowa State University, 2220 Hoover Hall, Ames, Iowa 50011, USA
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45
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Matsuyama K, Mishima K. Preparation of poly(methyl methacrylate)–TiO2 nanoparticle composites by pseudo-dispersion polymerization of methyl methacrylate in supercritical CO2. J Supercrit Fluids 2009. [DOI: 10.1016/j.supflu.2009.03.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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46
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Encapsulation of submicrometer-sized silica particles by a thin shell of poly(methyl methacrylate). J Colloid Interface Sci 2009; 331:351-5. [DOI: 10.1016/j.jcis.2008.11.052] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Revised: 11/20/2008] [Accepted: 11/21/2008] [Indexed: 11/18/2022]
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47
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Chemical synthesis and characterization of hydroxyapatite (HAp)-poly (ethylene co vinyl alcohol) (EVA) nanocomposite using a phosphonic acid coupling agent for orthopedic applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.06.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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48
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Abstract
BACKGROUND Ultrasonically activated devices have been used in gallbladder dissection in the laparoscopic cholecystectomy with encouraging results. The aim of this study was to compare between the safety and efficacy of the harmonic shears and the commonly used clip and cautery technique in achieving safe closure and division of the cystic duct in the laparoscopic cholecystectomy. METHODS In this prospective study, 120 patients with symptomatic gallstone disease were randomly assigned to either the harmonic scalpel laparoscopic cholecystectomy group (HS group=60 patients) where closure and division of the cystic duct was achieved solely by the harmonic shears or the clip and cautery laparoscopic cholecystectomy group (C&C group=60 patients). RESULTS Neither minor nor major bile leaks were encountered in either group. Similarly, no bile-duct injuries were encountered in the present study. The incidence of gallbladder perforation was statistically significantly higher in the C&C group, compared to the HS group (30 vs. 10%, respectively; P=0.002). The median operative time was statistically significantly shorter in the HS group than in the C&C group (32 vs. 40 minutes, respectively; P=0.000). No statistically significant difference was found in the incidence of postoperative complications between both groups. CONCLUSIONS The harmonic shears are as safe and effective as the commonly used clip and cautery technique in achieving safe closure and division of the cystic duct in the laparoscopic cholecystectomy. Further, it provides a superior alternative to the currently used high-frequency monopolar technology in terms of shorter operative time and lower incidence of gallbladder perforation.
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49
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Park SY, Park EJ, Lee MY, Park C, Kim HG, Jeong ED, Lim KT. Preparation of Al(OH)3/PMMA nanocomposites by emulsion polymerization. POLYM ADVAN TECHNOL 2008. [DOI: 10.1002/pat.1197] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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50
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Giaume D, Poggi M, Casanova D, Mialon G, Lahlil K, Alexandrou A, Gacoin T, Boilot JP. Organic functionalization of luminescent oxide nanoparticles toward their application as biological probes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11018-11026. [PMID: 18771302 DOI: 10.1021/la8015468] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Luminescent inorganic nanoparticles are now widely studied for their applications as biological probes for in vitro or in vivo experiments. The functionalization of the particles is a key step toward these applications, since it determines the control of the coupling between the particles and the biological species of interest. This paper is devoted to the case of rare earth doped oxide nanoparticles and their functionalization through their surface encapsulation with a functional polysiloxane shell. The first step of the process is the adsorption of silicate ions that will act as a primary layer for the further surface polymerization of the silane, either aminopropyltriethoxysilane (APTES) or glycidoxypropyltrimethoxysilane (GPTMS). The amino- or epoxy- functions born by the silane allow the versatile coupling of the particles with bio-organic species following the chemistry that is commonly used in biochips. Special attention is paid to the careful characterization of each step of the functionalization process, especially concerning the average number of organic functions that are available for the final coupling of the particles with proteins. The surface density of amino or epoxy functions was found to be 0.4 and 1.9 functions per square nanometer for GPTMS and APTES silanized particles, respectively. An example of application of the amino-functionalized particles is given for the coupling with alpha-bungarotoxins. The average number (up to 8) and the distribution of the number of proteins per particle are given, showing the potentialities of the functionalization process for the labeling of biological species.
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Affiliation(s)
- Domitille Giaume
- Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, CNRS, Route de Saclay, 91128 Palaiseau, France
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