Mechanical characterization of high-performance graphene oxide incorporated aligned fibroporous poly(carbonate urethane) membrane for potential biomedical applications

2015 ◽  
Vol 132 (16) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sudhin Thampi ◽  
Vignesh Muthuvijayan ◽  
Ramesh Parameswaran
Keyword(s):  
Graphene Oxide ◽  
Biomedical Applications ◽  
High Performance ◽  
Mechanical Characterization ◽  
Poly Carbonate

Mechanical Characterization of UV Photopolymerized PMMA with Different Photo-Initiator Concentration

2021 ◽  
Vol 903 ◽  
pp. 11-16
Author(s):  
M.A. Manjunath ◽  
K. Naveen ◽  
Prakash Vinod ◽  
N. Balashanmugam ◽  
M.R. Shankar
Keyword(s):  
Mechanical Properties ◽  
Light Source ◽  
Polymethyl Methacrylate ◽  
Biomedical Applications ◽  
Mechanical Characterization ◽  
Uv Light ◽  
Curing Time ◽  
Uv Led ◽  
Pmma Resin

Polymethyl methacrylate (PMMA) is one among few known photo-polymeric resin useful in lithography for fabricating structures having better mechanical properties to meet the requirement in electronics and biomedical applications. This study explores the effect of Photo Initiator (PI) concentration and also curing time on strength and hardness of Polymethyl methacrylate (PMMA) obtained by UV photopolymerization of Methyl methacrylate (MMA) monomer. The UV LED light source operating at the wavelength of 364 nm is used with Benzoin Ethyl Ether (BEE) as photo initiator. The curing of PMMA resin is supported with peltier cooling device placed at the bottom of the UV light source. The characterisation study of UV photo cured PMMA is analysed through nano indenter (Agilent Technologies-G200). The current work investigates the influence of PI concentration and curing time in achieving maximum mechanical properties for UV photopolymerized PMMA.

scholarly journals Synthesis and Mechanical Characterization of Chitosan Threads for Biomedical Applications

2019 ◽  
Vol 148 (1) ◽  
pp. 15-23
Author(s):  
I. Rodriguez ◽  
O. Rivera-Debernardi ◽  
A. Rosillo ◽  
I. Delgadillo-Holtfort ◽  
J. Delgado
Keyword(s):  
Biomedical Applications ◽  
Mechanical Characterization

Fabrication and Characterization of Graphene Oxide/Polyaniline Electrode Composite for High Performance Supercapacitors

2019 ◽  
Vol 8 (11) ◽  
pp. M103-M109
Author(s):  
Yaoyao Wang ◽  
Yanxiang Wang ◽  
Yu Tian ◽  
Lianru Ma ◽  
Chengguo Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Fabrication And Characterization

scholarly journals Synthesis and Characterization of Graphene Oxide Derivatives via Functionalization Reaction with Hexamethylene Diisocyanate

Proceedings ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 8 ◽  
Author(s):  
José A. Luceño-Sánchez ◽  
Georgiana Maties ◽  
Camino Gonzalez-Arellano ◽  
Ana M. Díez-Pascual
Keyword(s):  
Graphene Oxide ◽  
High Performance ◽  
Organic Molecules ◽  
Hexamethylene Diisocyanate ◽  
Reaction Conditions ◽  
Ft Ir ◽  
Oxygen Groups ◽  
Functionalization Reaction ◽  
Ft Ir Spectroscopy

Graphene oxide (GO), the oxidized form of graphene, shows unique properties, such as strong mechanical strength, high thermal conductivity, amphiphilicity, and surface functionalization capability that make it very attractive in various fields, ranging from medicine to optoelectronic devices and solar cells. However, its insolubility in non-polar and polar aprotic solvents hinders some applications. To solve this issue, novel functionalization strategies are pursued. In this regard, the current study deals with the preparation and characterization of hexamethylene diisocyanate (HDI)-functionalized GO. Different reaction conditions were tested to optimize the functionalization degree (FD), and detailed characterization was conducted via Fourier-transformed infrared (FT-IR) spectroscopy to confirm the success of the functionalization reaction. The HDI-GO could further react with other organic molecules or polymers via the remaining oxygen groups, which makes them ideal candidates as nanofillers for high-performance GO-based polymer nanocomposites.

Mechanical Characterization Study of Sintered Silver Pastes Bonded in a Double-Lap Configuration

2018 ◽  
Author(s):  
Paul Paret ◽  
Joshua Major ◽  
Douglas DeVoto ◽  
Sreekant Narumanchi ◽  
Yansong Tan ◽  
...  
Keyword(s):  
High Performance ◽  
Mechanical Characterization ◽  
Wide Bandgap ◽  
State University ◽  
Silver Particles ◽  
Enabling Technology ◽  
Characterization Study ◽  
Synthesis Procedure ◽  
Sintered Silver

Sintered silver-based bonded interfaces are a critical enabling technology for high-temperature, compact, high-performance, and reliable wide-bandgap packages and components. High-pressure (∼40 MPa) sintered silver interfaces have been implemented commercially, most notably the commercial products offered by Semikron. To reduce manufacturing complexity, there is significant industry interest in pressure-less sintered silver interfaces. To this end, current formulations of sintered silver paste are comprised of purely nano-sized silver particles or a combination of nano- and micro-sized silver particles/flakes. It is essential to quantify the mechanical properties and determine the reliability of these interfaces prior to use in automotive power electronics applications. In this paper, research efforts at the National Renewable Energy Laboratory, in collaboration with Virginia Polytechnic Institute and State University and an industry partner, in optimizing the synthesis procedure and mechanical characterization of sintered silver double-lap samples are described. These double-lap samples were synthesized using pressure-less sintering techniques. Shear testing was conducted at multiple temperatures and displacement rates on these samples sintered using two types of sintered sintered silver pastes, one of them consisting of nano-silver particles and the other a hybrid paste or a combination of nano- and micron-sized silver flakes, employed in a double-lap configuration. Maximum values of shear stress obtained from the characterization study are reported.

scholarly journals Photoacoustic viscoelasticity imaging dedicated to mechanical characterization of biological tissues

2017 ◽  
Vol 10 (04) ◽  
pp. 1730005 ◽  
Author(s):  
Yujiao Shi ◽  
Fen Yang ◽  
Qian Wang
Keyword(s):  
Medical Diagnosis ◽  
Biomedical Applications ◽  
Phase Contrast ◽  
Mechanical Characterization ◽  
Biological Tissues ◽  
Physical Parameters ◽  
Mathematical Relationship ◽  
Vascular Endoscopy ◽  
Photoacoustic Measurement

Since changes in mechanical properties of biological tissues are often closely related to pathology, the viscoelastic properties are important physical parameters for medical diagnosis. A photoacoustic (PA) phase-resolved method for noninvasively characterizing the biological tissue viscoelasticity has been proposed by Gao et al. [G. Gao, S. Yang, D. Xing, “Viscoelasticity imaging of biological tissues with phase-resolved photoacoustic measurement,” Opt. Lett. 36, 3341–3343 (2011)]. The mathematical relationship between the PA phase delay and the viscosity–elasticity ratio has been theoretically deduced. Moreover, systems of PA viscoelasticity (PAVE) imaging including PAVE microscopy and PAVE endoscopy were developed, and high-PA-phase contrast images reflecting the tissue viscoelasticity information have been successfully achieved. The PAVE method has been developed in tumor detection, atherosclerosis characterization and related vascular endoscopy. We reviewed the development of the PAVE technique and its applications in biomedical fields. It is believed that PAVE imaging is of great potential in both biomedical applications and clinical studies.

An Alternative Approach for FRCM Matrix Tensile Strength Evaluation

2019 ◽  
Vol 817 ◽  
pp. 365-370 ◽  
Author(s):  
Alessandro Bellini ◽  
Marco Bovo ◽  
Andrea Incerti ◽  
Claudio Mazzotti
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Mechanical Characterization ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Test Methods ◽  
Test Method ◽  
The Matrix ◽  
Flexural Tests

Structural retrofitting with composite materials proved to be an effective technique for rehabilitation of degraded or damaged masonry and concrete buildings. Nowadays, Fiber Reinforced Cementitious Matrix (FRCM) composites are widely used as externally bonded strengthening systems thanks to their high performance, low weight and easiness of installation. Several experimental tests and numerical studies are currently available concerning the tensile and bond behavior of FRCM systems, but a debated and still open issue concerns the methods for the mechanical characterization of the mortar used as matrix within the strengthening system. The present paper analyses and compares different test methods for determining the matrix tensile strength. Pure tensile and flexural tests have been carried out on different mortar matrix samples. In order to evaluate which is the most suitable value to be considered for a correct interpretation and modeling of the composite system, the experimental results obtained through flexural tests on standard mortar specimens have been compared with the outcomes obtained from direct tensile tests on FRCM coupons. The present study represents only a first step for the definition of the most appropriate test method for the mechanical characterization of the matrix used within FRCM strengthening systems.

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