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Wei X, Luo Y, Tao Y, Li X, Meng F. Experimental Research into the Uniaxial Compressive Strength of Low-Density Reef Limestone Based on Image Recognition. Materials (Basel) 2023; 16:5465. [PMID: 37570169 PMCID: PMC10420266 DOI: 10.3390/ma16155465] [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] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/27/2023] [Accepted: 08/02/2023] [Indexed: 08/13/2023]
Abstract
Low-density reef limestone is widely distributed in tropical oceans; exploring its mechanical properties is of significance to practices in marine foundation engineering. In this research, laboratory experiments on low-density reef limestones with two different types of porous structures were conducted using image recognition methods to study the special mechanical properties of low-reef limestone. S¯ was defined as the parameter quantifying the pore geometry, and the calculation method of S¯ was optimized based on image recognition data. Finally, the influencing factors of uniaxial compressive strength (UCS) of low-density reef limestone were analyzed, and a modified formula considering pore structure was proposed. The results indicate the following: Image recognition methods were used to determine feasibility and convenience of capturing 2D pore geometric information of specimens. The optimization method of S¯ is conducive to improving automatic image recognition accuracy. Low-density reef limestones with different porous structures show small difference in porosity and density, while they exhibit large differences in pore sizes and UCS. The UCS of low-density reef limestone is found to be jointly influenced by pore structure and density (it increases with the decrease in parameter S¯ and increase in density). The results may provide help for those investigating the mechanical properties of reef limestone and practices in marine foundation engineering.
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Affiliation(s)
- Xiaoqing Wei
- Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China; (X.W.); (F.M.)
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Yi Luo
- Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China; (X.W.); (F.M.)
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Yuhang Tao
- Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China; (X.W.); (F.M.)
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Xinping Li
- Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China; (X.W.); (F.M.)
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Fei Meng
- Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China; (X.W.); (F.M.)
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
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Babuska T, Curry JF, Thorpe R, Chowdhury MI, Strandwitz NC, Krick BA. High-Sensitivity Low-Energy Ion Spectroscopy with Sub-Nanometer Depth Resolution Reveals Oxidation Resistance of MoS 2 Increases with Film Density and Shear-Induced Nanostructural Modifications of the Surface. ACS Appl Nano Mater 2023; 6:1153-1160. [PMID: 36743857 PMCID: PMC9887728 DOI: 10.1021/acsanm.2c04703] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 12/20/2022] [Indexed: 06/18/2023]
Abstract
For decades, density has been attributed as a critical aspect of the structure of sputter-deposited nanocrystalline molybdenum disulfide (MoS2) coatings impacting oxidation resistance and wear resistance. Despite its importance, there are few examples in the literature that explicitly investigate the relationship between the density and oxidation behaviors of MoS2 coatings. Aging and oxidation are primary considerations for the use of MoS2 coatings in aerospace applications as they inevitably experience prolonged storage in water and oxygen-rich environments prior to use. Oxidation that is either limited to the first few nanometers or through the bulk of the coating can result in seizure due to high initial coefficients of friction or component failure from excessive wear. High-sensitivity low-energy ion spectroscopy (HS-LEIS) and Rutherford backscattering spectrometry (RBS) are both used to understand the extent of oxidation throughout the first ∼10 nanometers of the surface of pure sputtered nanocrystalline MoS2 coatings after high-temperature aging and how it is impacted by the density of coatings as measured by RBS. Results show that low-density coatings (ρ = 3.55 g/cm3) exhibit a more columnar microstructure and voiding, which act as pathways for oxidative species to penetrate and interact with edge sites, causing severe surface and subsurface oxidation. Furthermore, HS-LEIS of surfaces sheared prior to oxidation reveals that the oxidation resistance of low-density MoS2 coatings can be significantly improved by shear-induced reorientation of the surface microstructure to a basal orientation and elimination of pathways for oxygen into the bulk through compaction of surface and subsurface voids.
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Affiliation(s)
- Tomas
F. Babuska
- FAMU-FSU
College of Engineering, Florida State University, Tallahassee, Florida32310, United States
- Material,
Physical and Chemical Sciences Center, Sandia
National Laboratories, Albuquerque, New Mexico87185-5820, United States
- Mechanical
Engineering Department, Lehigh University, Bethlehem, Pennsylvania18015-3027, United
States
| | - John F. Curry
- Material,
Physical and Chemical Sciences Center, Sandia
National Laboratories, Albuquerque, New Mexico87185-5820, United States
| | - Ryan Thorpe
- Institute
of Functional Materials and Devices, Lehigh
University, Bethlehem, Pennsylvania18015-3027, United States
| | - Md. Istiaque Chowdhury
- Materials
Science and Engineering Department, Lehigh
University, Bethlehem, Pennsylvania18015-3027, United States
| | - Nicholas C. Strandwitz
- Materials
Science and Engineering Department, Lehigh
University, Bethlehem, Pennsylvania18015-3027, United States
| | - Brandon A. Krick
- FAMU-FSU
College of Engineering, Florida State University, Tallahassee, Florida32310, United States
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Kaaya RD, Matowo J, Kajeguka D, Tenu F, Shirima B, Mosha F, Kavishe R. The Impact of Submicroscopic Parasitemia on Malaria Rapid Diagnosis in Northeastern Tanzania, an Area with Diverse Transmission Patterns. Infect Dis Rep 2022; 14:798-809. [PMID: 36412740 DOI: 10.3390/idr14060082] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 08/07/2022] [Accepted: 08/08/2022] [Indexed: 12/14/2022] Open
Abstract
Global malaria epidemiology has changed in the last decade with a substantial increase in cases and deaths being recorded. Tanzania accounts for about 4% of all cases and deaths reported in recent years. Several factors contribute to the resurgence of malaria, parasite resistance to antimalarials and mosquito resistance to insecticides being at the top of the list. The presence of sub-microscopic infections poses a significant challenge to malaria rapid diagnostic tests (mRDT). Our cross-sectional surveys in Handeni and Moshi, Tanzania assessed the effect of low parasite density on mRDT. Handeni had higher malaria prevalence by mRDT (39.6%), light microscopy (LM) (16.9%) and polymerase chain reaction (PCR) (18.5%), compared to Moshi with prevalence of 0.2%, 1.3% and 2.3%, respectively. A significant difference (p ˂ 0.001) in malaria prevalence by mRDT, LM and nested PCR was found among age groups. In comparison to all other groups, school-age children (5-15 years) had the highest prevalence of malaria. Our results show that mRDT may miss up to 6% of cases of malaria mainly due to low-density parasitemia when compared to LM and PCR. Routinely used mRDT will likely miss the sub-microscopic parasitemia which will ultimately contribute to the spread of malaria and hinder efforts of elimination.
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Henry C, Gondaliya A, Thies M, Nejad M. Studying the Suitability of Nineteen Lignins as Partial Polyol Replacement in Rigid Polyurethane/Polyisocyanurate Foam. Molecules 2022; 27:2535. [PMID: 35458731 DOI: 10.3390/molecules27082535] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/25/2022] [Accepted: 04/02/2022] [Indexed: 11/20/2022]
Abstract
In this study, nineteen unmodified lignins from various sources (hardwood, softwood, wheat straw, and corn stover) and isolation processes (kraft, soda, organosolv, sulfite, and enzymatic hydrolysis) were used to replace 30 wt.% of petroleum-based polyol in rigid polyurethane/polyisocyanurate (PUR/PIR) foam formulations. Lignin samples were characterized by measuring their ash content, hydroxyl content (Phosphorus Nuclear Magnetic Resonance Spectroscopy), impurities (Inductively Coupled Plasma), and pH. After foam formulation, properties of lignin-based foams were evaluated and compared with a control foam (with no lignin) via cell morphology, closed-cell content, compression strength, apparent density, thermal conductivity, and color analysis. Lignin-based foams passed all measured standard specifications required by ASTM International C1029-15 for type 1 rigid insulation foams, except for three foams. These three foams had poor compressive strengths, significantly larger cell sizes, darker color, lower closed-cell contents, and slower foaming times. The foam made with corn stover enzymatic hydrolysis lignin showed no significant difference from the control foam in terms of compressive strength and outperformed all other lignin-based foams due to its higher aliphatic and p-hydroxyphenyl hydroxyl contents. Lignin-based foams that passed all required performance testing were made with lignins having higher pH, potassium, sodium, calcium, magnesium, and aliphatic/p-hydroxyphenyl hydroxyl group contents than those that failed.
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Singh B, Yidris N, Basri AA, Pai R, Ahmad KA. Study of Mosquito Aerodynamics for Imitation as a Small Robot and Flight in a Low-Density Environment. Micromachines (Basel) 2021; 12:511. [PMID: 34063196 PMCID: PMC8147425 DOI: 10.3390/mi12050511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 03/26/2021] [Accepted: 03/27/2021] [Indexed: 11/28/2022]
Abstract
In terms of their flight and unusual aerodynamic characteristics, mosquitoes have become a new insect of interest. Despite transmitting the most significant infectious diseases globally, mosquitoes are still among the great flyers. Depending on their size, they typically beat at a high flapping frequency in the range of 600 to 800 Hz. Flapping also lets them conceal their presence, flirt, and help them remain aloft. Their long, slender wings navigate between the most anterior and posterior wing positions through a stroke amplitude about 40 to 45°, way different from their natural counterparts (>120°). Most insects use leading-edge vortex for lift, but mosquitoes have additional aerodynamic characteristics: rotational drag, wake capture reinforcement of the trailing-edge vortex, and added mass effect. A comprehensive look at the use of these three mechanisms needs to be undertaken-the pros and cons of high-frequency, low-stroke angles, operating far beyond the normal kinematic boundary compared to other insects, and the impact on the design improvements of miniature drones and for flight in low-density atmospheres such as Mars. This paper systematically reviews these unique unsteady aerodynamic characteristics of mosquito flight, responding to the potential questions from some of these discoveries as per the existing literature. This paper also reviews state-of-the-art insect-inspired robots that are close in design to mosquitoes. The findings suggest that mosquito-based small robots can be an excellent choice for flight in a low-density environment such as Mars.
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Affiliation(s)
- Balbir Singh
- Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia; (N.Y.); (A.A.B.)
- Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India
| | - Noorfaizal Yidris
- Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia; (N.Y.); (A.A.B.)
| | - Adi Azriff Basri
- Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia; (N.Y.); (A.A.B.)
| | - Raghuvir Pai
- Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India;
| | - Kamarul Arifin Ahmad
- Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia; (N.Y.); (A.A.B.)
- Aerospace Malaysia Research Centre, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
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Iglesias N, Galbis E, Romero-Azogil L, Benito E, Lucas R, García-Martín MG, de-Paz MV. In-Depth Study into Polymeric Materials in Low-Density Gastroretentive Formulations. Pharmaceutics 2020; 12:E636. [PMID: 32645909 DOI: 10.3390/pharmaceutics12070636] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/30/2020] [Accepted: 07/03/2020] [Indexed: 12/01/2022] Open
Abstract
The extensive use of oral dosage forms for the treatment of diseases may be linked to deficient pharmacokinetic properties. In some cases the drug is barely soluble; in others, the rapid transit of the formulation through the gastrointestinal tract (GIT) makes it difficult to achieve therapeutic levels in the organism; moreover, some drugs must act locally due to a gastric pathology, but the time they remain in the stomach is short. The use of formulations capable of improving all these parameters, as well as increasing the resident time in the stomach, has been the target of numerous research works, with low-density systems being the most promising and widely explored, however, there is further scope to improve these systems. There are a vast variety of polymeric materials used in low-density gastroretentive systems and a number of methods to improve the bioavailability of the drugs. This works aims to expedite the development of breakthrough approaches by providing an in-depth understanding of the polymeric materials currently used, both natural and synthetic, their properties, advantages, and drawbacks.
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Abd El-Aziz MF, Ismail S, Tadros MI, Elnabarawi MA. Alfuzosin hydrochloride-loaded low-density gastroretentive sponges: development, in vitro characterization and gastroretentive monitoring in healthy volunteers via MRI. Pharm Dev Technol 2020; 25:566-578. [PMID: 31967910 DOI: 10.1080/10837450.2020.1720235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The current work aimed to develop low-density gastroretentive sponges loaded with alfuzosin HCl (ALF) to sustain the rate of drug release, improve its oral bioavailability and deliver it to the main site of absorption. Sponges were developed, according to a 23 full factorial design, by compression of the lyophilized ALF-loaded hydroxypropylmethylcellulose (HPMC) or chitosan (CH) solutions. The influences of the polymer type, grade and concentration on the appearance, topography, porosity, density, in vitro ALF release, floating behavior, swelling, erosion, and mucoadhesive potential of the developed sponges were explored. Based on the desirability value, the best achieved system was selected. The gastroretentive potential of this system was evaluated in healthy male volunteers via MRI. Soft and flexible sponges were developed. They were characterized with interconnecting pores and channels and had excellent floating properties with respect to floating lag time and duration. Compared to HPMC-based sponges, CH-based ones exhibited higher porosity, larger pore diameters, lower bulk densities, higher drug release rates, larger swelling ratios, faster erosion rates and better mucoadhesive properties. MRI of magnetite-loaded best-achieved CH-based system (F8) ascertained the development of a promising gastroretentive system; exhibiting a gastric residence period of at least 5 h.
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Affiliation(s)
| | - Soha Ismail
- Department of Pharmaceutics, National Organization for Drug Control and Research, Giza, Egypt
| | - Mina Ibrahim Tadros
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mohamed Ahmed Elnabarawi
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Pérez N, Qi XL, Nie S, Acuña P, Chen MJ, Wang DY. Flame Retardant Polypropylene Composites with Low Densities. Materials (Basel) 2019; 12:E152. [PMID: 30621247 PMCID: PMC6337086 DOI: 10.3390/ma12010152] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/24/2018] [Accepted: 12/28/2018] [Indexed: 11/28/2022]
Abstract
Polypropylene (PP) is currently widely used in areas requiring lightweight materials because of its low density. Due to the intrinsic flammability, the application of PP is restricted in many conditions. Aluminum trihydroxide (ATH) is reported as a practical flame retardant for PP, but the addition of ATH often diminishes the lightweight advantage of PP. Therefore, in this work, glass bubbles (GB) and octacedylamine-modified zirconium phosphate (mZrP) are introduced into the PP/ATH composite in order to lower the material density and simultaneously maintain/enhance the flame retardancy. A series of PP composites have been prepared to explore the formulation which can endow the composite with balanced flame retardancy, good mechanical properties, and low density. The morphology, thermal stability, flame retardancy, and mechanical properties of the composites were characterized. The results indicated the addition of GB could reduce the density, but decreased the flame retardancy of PP composites at the same time. To overcome this defect, ATH and mZrP with synergetic effect of flame retardancy were added into the composite. The dosage of each additive was optimized for achieving a balance of flame retardancy, good mechanical properties, and density. With 47 wt % ATH, 10 wt % GB, and 3 wt % mZrP, the peak heat release rate (pHRR) and total smoke production (TSP) of the composite PP-4 were reduced by 91% and 78%, respectively. At the same time, increased impact strength was achieved compared with neat PP and the composite with ATH only. Maintaining the flame retardancy and mechanical properties, the density of composite PP-4 (1.27 g·cm-3) is lower than that with ATH only (PP-1, 1.46 g·cm-3). Through this research, we hope to provide an efficient approach to designing flame retardant polypropylene (PP) composites with low density.
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Affiliation(s)
- Nerea Pérez
- IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.
| | - Xiao-Lin Qi
- IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.
| | - Shibin Nie
- IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.
- School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan 233100, China.
| | - Pablo Acuña
- IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.
| | - Ming-Jun Chen
- School of Science, Xihua University, Chengdu 610039, China.
| | - De-Yi Wang
- IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.
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Sun MJ, Cao X, Cao Z. Si(C≡C)4-Based Single-Crystalline Semiconductor: Diamond-like Superlight and Superflexible Wide-Bandgap Material for the UV Photoconductive Device. ACS Appl Mater Interfaces 2016; 8:16551-16554. [PMID: 27334253 DOI: 10.1021/acsami.6b05502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A wide-bandgap SiC4 semiconductor with low density and high elasticity has been designed and characterized by ab initio molecular dynamics simulations and first-principles calculations. The through-space conjugation among the d orbitals of Si and the π* orbitals of ethynyl moieties can remarkably enhance the photoconductivity. This new-type superlight and superflexible semiconductor is predicted to have unique electronic, optical, and mechanical properties, and it is a quite promising material for the high-performance UV optoelectronic devices suitable for various practical demands in a complex environment.
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Affiliation(s)
- Ming-Jun Sun
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, and ‡Institute of Theoretical Physics, Department of Physics, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University , Xiamen 361005, China
| | - Xinrui Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, and ‡Institute of Theoretical Physics, Department of Physics, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University , Xiamen 361005, China
| | - Zexing Cao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, and ‡Institute of Theoretical Physics, Department of Physics, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen University , Xiamen 361005, China
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Shen B, Li Y, Zhai W, Zheng W. Compressible Graphene-Coated Polymer Foams with Ultralow Density for Adjustable Electromagnetic Interference (EMI) Shielding. ACS Appl Mater Interfaces 2016; 8:8050-7. [PMID: 26974443 DOI: 10.1021/acsami.5b11715] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The fabrication of low-density and compressible polymer/graphene composite (PGC) foams for adjustable electromagnetic interference (EMI) shielding remains a daunting challenge. Herein, ultralightweight and compressible PGC foams have been developed by simple solution dip-coating of graphene on commercial polyurethane (PU) sponges with highly porous network structure. The resultant PU/graphene (PUG) foams had a density as low as ∼0.027-0.030 g/cm(3) and possessed good comprehensive EMI shielding performance together with an absorption-dominant mechanism, possibly due to both conductive dissipation and multiple reflections and scattering of EM waves by the inside 3D conductive graphene network. Moreover, by taking advantage of their remarkable compressibility, the shielding performance of the PUG foams could be simply adjusted through a simple mechanical compression, showing promise for adjustable EMI shielding. We believe that the strategy for fabricating PGC foams through a simple dip-coating method could potentially promote the large-scale production of lightweight foam materials for EMI shielding.
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Affiliation(s)
- Bin Shen
- Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China
| | - Yang Li
- Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China
| | - Wentao Zhai
- Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China
| | - Wenge Zheng
- Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences , Ningbo, Zhejiang 315201, China
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Munjal S, Munjal S, Hazari P, Mahajan H, Munjal A, Mehta DS. Evaluation of specifically designed implants placed in the low-density jaw bones: A clinico-radiographical study. Contemp Clin Dent 2015; 6:40-3. [PMID: 25684910 PMCID: PMC4319343 DOI: 10.4103/0976-237x.149290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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] [Indexed: 11/19/2022] Open
Abstract
AIM In the less dense bone, it is difficult to obtain implant anchorage. The present study was undertaken to determine the survival rate of Maestro™ implants placed in d3 and d4 bones. MATERIALS AND METHODS Fourteen patients (10 males and 4 females) were selected for the study and implants were evaluated for posttreatment changes in at 3, 6, 9 and 12 months from implant placement. The implant probing depth and mobility were recorded 3 and 6 months after prosthesis placement. Also, peri-implant bone level was assessed at the baseline and 12 months postoperatively, followed by a statistical analysis. RESULTS The mean plaque and gingival indices showed a reduction at repeated intervals. The mean sulcular bleeding showed a slight reduction which was statistically significant. An overall mean bone loss was observed after 12 months follow-up, which was statistically not significant. The overall survival rate of implants was reported as 92.3%. CONCLUSION The specific implant used in the study is advantageous in the soft bone condition. CLINICAL SIGNIFICANCE Although, there is a great evidence of implant failure in compromised jaw quality, the newer designs and approaches suggest that the poor quality is not a contraindication.
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Affiliation(s)
- Sumit Munjal
- Department of Periodontics, Institute of Dental Studies and Technologies, Modinagar, Uttar Pradesh, India
| | - Seema Munjal
- Department of Prosthodontics and Crown and Bridge, Dr. BR Ambedkar Institute of Dental Sciences and Hospital, Patna, Bihar, India
| | - Puja Hazari
- Department of Prosthodontics, People's Dental Academy, Bhopal, Madhya Pradesh, India
| | - Harsh Mahajan
- Department of Prosthodontics, People's Dental Academy, Bhopal, Madhya Pradesh, India
| | - Akshay Munjal
- Department of Periodontics, SGT Dental College Hospital and Research Institute, Gurgaon, Haryana, India
| | - D. S. Mehta
- Department of Periodontics, Bapuji Dental College and Hospital, Davangere, Karnataka, India
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