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https://www.readbyqxmd.com/read/28227889/shape-memory-alloy-smart-knee-spacer-to-enhance-knee-functionality-model-design-and-finite-element-analysis
#1
Arvind Gautam, A Bhargavi Rani, Miguel A Callejas, Swati Ghosh Acharyya, Amit Acharyya, Dwaipayan Biswas, Vasundhra Bhandari, Paresh Sharma, Ganesh R Naik, Arvind Gautam, A Bhargavi Rani, Miguel A Callejas, Swati Ghosh Acharyya, Amit Acharyya, Dwaipayan Biswas, Vasundhra Bhandari, Paresh Sharma, Ganesh R Naik, Swati Ghosh Acharyya, Paresh Sharma, Vasundhra Bhandari, A Bhargavi Rani, Arvind Gautam, Dwaipayan Biswas, Miguel A Callejas, Amit Acharyya
In this paper we introduce Shape Memory Alloy (SMA) for designing the tibial part of Total Knee Arthroplasty (TKA) by exploiting the shape-memory and pseudo-elasticity property of the SMA (e.g. NiTi). This would eliminate the drawbacks of the state-of-the art PMMA based knee-spacer including fracture, sustainability, dislocation, tilting, translation and subluxation for tackling the Osteoarthritis especially for the aged people of 45-plus or the athletes. In this paper a Computer Aided Design (CAD) model using SolidWorks for the knee-spacer is presented based on the proposed SMA adopting the state-of-the art industry-standard geometry that is used in the PMMA based spacer design...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226495/a-pmma-microfluidic-dielectric-sensor-for-blood-coagulation-monitoring-at-the-point-of-care
#2
Debnath Maji, Michael A Suster, Erdem Kucukal, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni, Debnath Maji, Michael A Suster, Erdem Kucukal, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni, Umut A Gurkan, Pedram Mohseni, Debnath Maji, Erdem Kucukal, Evi X Stavrou, Michael A Suster
This paper describes the design and construct of a fully biocompatible, microfluidic, dielectric sensor targeted at monitoring human whole blood coagulation at the point-of-care (POC). The sensor assembly procedure involves using sputtered electrodes in a microfluidic channel with a physiologically relevant height of 50μm to create a three-dimensional (3D), parallel-plate, capacitive sensing area. The sensor is constructed with biocompatible materials of polymethyl methacrylate (PMMA) for the substrate and titanium nitride (TiN) for the sensing and floating electrodes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223784/thermomechanical-properties-of-pmma-and-modified-swcnt-composites
#3
P Kalakonda, S Banne
It is well known that the addition of carbon nanotubes (CNTs) can strongly affect the thermomechanical and electrical properties of the polymer into which they are dispersed. The common solvent mixing dispersion method of functionalized CNTs and polymer composites can improve thermal, mechanical, and electrical properties. In this study, functionalized single-walled CNTs (COOH-SWCNTs) and poly(methyl methacrylate) were used to fabricate the polymer nanocomposites using a common solvent dispersion mixing method...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/28223199/poly-methyl-methacrylate-with-tio2-nanoparticles-inclusion-for-stereolitographic-complete-denture-manufacturing-the-fututre-in-dental-care-for-elderly-edentulous-patients
#4
Eugenia Eftimie Totu, Aurelia Cristina Nechifor, Gheorghe Nechifor, Hassan Y Aboul-Enein, Corina Marilena Cristache
OBJECTIVES: The aim of this study was to obtain a Poly(methylmethacrylate) (PMMA)-TiO2 nanocomposite material with improved antibacterial characteristics, suitable for manufacturing 3D printed dental prosthesis. METHODS: 0.2, 0.4, 0.6, 1, 2.5 by weight% of TiO2 nanoparticles have been added to the commercially available stereolithographic PMMA material and the obtained nanocomposites have been analyzed using FTIR, SEM and also tested for antimicrobial efficacy against bacterial cultures from Candida species (C...
February 18, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28221806/absorption-and-quantum-yield-of-single-conjugated-polymer-meh-ppv-molecules
#5
Lei Hou, Subhasis Adhikari, Yuxi Tian, Ivan G Scheblykin, Michel Orrit
We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a PMMA matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provide new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than that of smaller ones...
February 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28220852/transfer-of-monolayer-tmd-ws2-and-raman-study-of-substrate-effects
#6
Jerome T Mlack, Paul Masih Das, Gopinath Danda, Yung-Chien Chou, Carl H Naylor, Zhong Lin, Néstor Perea López, Tianyi Zhang, Mauricio Terrones, A T Charlie Johnson, Marija Drndić
A facile transfer process for transition metal dichalcogenide WS2 flakes is reported and the effect of the underlying substrate on the flake properties is investigated using Raman spectroscopy. The flakes are transferred from their growth substrate using polymethyl methacrylate (PMMA) and a wet etch to allow the user to transfer the flakes to a final substrate using a microscope and micromanipulator combined with semi-transparent Kapton tape. The substrates used range from insulators such as industry standard high-k dielectric HfO2 and "green polymer" parylene-C, to conducting chemical vapor deposition (CVD) grown graphene...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28219298/microwave-assisted-surface-modification-for-the-separation-of-polycarbonate-from-polymethylmethacrylate-and-polyvinyl-chloride-waste-plastics-by-flotation
#7
Luoluo Huang, Hui Wang, Chongqing Wang, Junyao Zhao, Bo Zhang
Microwave-assisted potassium permanganate modification (MPPM) was used for the flotation separation of polycarbonate (PC) from polyvinyl chloride (PVC) and polymethylmethacrylate (PMMA) waste plastics. The separation process was optimized by investigating the potassium permanganate concentration, treatment time, flotation time and frother concentration. MPPM selectively reduced the flotation recovery of PC. The optimum conditions were determined to be: potassium permanganate concentration, 2 mM/L; treatment time, 1 min; frother concentration, 17...
March 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28218827/reduction-of-line-edge-roughness-of-polystyrene-block-poly-methyl-methacrylate-copolymer-nanopatterns-by-introducing-hydrogen-bonding-at-the-junction-point-of-two-block-chains
#8
Kyu Seong Lee, Jaeyong Lee, Jongheon Kwak, Hong Chul Moon, Jin Kon Kim
To apply well-defined block copolymer nanopatterns to next-generation lithography or high-density storage devices, small line edge roughness (LER) of nanopatterns should be realized. Although polystyrene-block-poly(methyl methacrylate) copolymer (PS-b-PMMA) has been widely used to fabricate nanopatterns because of easy perpendicular orientation of the block copolymer nanodomains and effective removal of PMMA block by dry etching, the fabricated nanopatterns show poorer line edge roughness (LER) due to relatively small Flory-Huggins interaction parameter (χ) between PS and PMMA chains...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211793/a-novel-field-emission-microscopy-method-to-study-field-emission-characteristics-of-freestanding-carbon-nanotube-array
#9
Yunhan Li, Yonghai Sun, David Jaffray, John T W Yeow
Field emission (FE) uniformity and mechanism of emitter failure of freestanding carbon nanotube (CNT) arrays have not been well studied due to the difficulty of observing and quantifying FE performance of each emitter in CNT arrays. Herein a field emission microscopy (FEM) method based on Poly(methyl methacrylate) (PMMA) thin film is proposed to study the FE uniformity and CNT emitter failure of freestanding CNT arrays. FE uniformity of freestanding CNT arrays and different levels of FE current contributions from each emitter in the arrays are recorded and visualized...
February 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28209008/effect-of-resin-bonded-luting-agents-influencing-marginal-discrepancy-in-all-ceramic-complete-veneer-crowns
#10
Dhanraj Ganapathy, Anusha Sathyamoorthy, Hemalatha Ranganathan, Karthikeyan Murthykumar
INTRODUCTION: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. AIM: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. MATERIALS AND METHODS: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208081/molecular-synergy-in-biolubrication-the-role-of-cartilage-oligomeric-matrix-protein-comp-in-surface-structuring-of-lubricin
#11
Akanksha Raj, Min Wang, Chao Liu, Liaquat Ali, Niclas G Karlsson, Per M Claesson, Andra Dėdinaitė
HYPOTHESIS: Synovial surfaces are lubricated by biomolecular aggregates that act in synergy, and lubricin is one key biolubricant. Its molecular structure allows extensive hydration and this is conducive to its lubrication performance. However, in order to fullfil its lubrication function it needs to be anchored and oriented on the surface in a proper way. We suggest that cartilage oligomeric matrix protein (COMP) is one of the biomolecules that promotes anchoring of lubricin in a fashion that facilitates lubrication...
February 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28207656/biomechanical-evaluation-of-transpedicular-nucleotomy-with-intact-annulus-fibrosus
#12
Fabrizio Russo, Robert A Hartman, Kevin M Bell, Nam Vo, Gwendolyn A Sowa, James D Kang, Gianluca Vadalà, Vincenzo Denaro
STUDY DESIGN: Biomechanical testing of partially nucleotomized ovine cadaveric spines. OBJECTIVE: To explore how the nucleus pulposus (NP) affects the biomechanical behavior of the intervertebral disc (IVD) by performing a partial nucleotomy via the transpedicular approach. SUMMARY OF BACKGROUND DATA: Mechanical loading represents a crucial part of IVD homeostasis. However, traditional regenerative strategies require violation of the annulus fibrosus (AF) resulting in significant alteration of joint mechanics...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28202221/elastoplasty-as-a-promising-novel-technique-vertebral-augmentation-with-an-elastic-silicone-based-polymer
#13
Alessandro Gasbarrini, Riccardo Ghermandi, Yunus Emre Akman, Marco Girolami, Stefano Boriani
OBJECTIVE: Percutaneous vertebroplasty with polymethylmethacrylate (PMMA) restores the stiffness and the strength of fractured vertebral bodies, but changes the pattern of the stress transfer. This effect may cause a secondary fracture of the adjacent vertebrae. Elastoplasty has emerged as a new technique to overcome this complication. The aim of this study is to retrospectively evaluate the clinical results of the elastoplasty procedure. MATERIALS AND METHODS: Thirthy nine patients (9 males, 30 females, 87 spinal levels) were clinically evaluated pre and postoperatively in terms of pain relief, leakage and silicone embolism...
February 12, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28195457/effect-of-entrapped-solvent-on-the-evolution-of-lateral-order-in-self-assembled-p-s-r-mma-ps-b-pmma-systems-with-different-thicknesses
#14
Tommaso Jacopo Giammaria, Federico Ferrarese Lupi, Gabriele Seguini, Katia Sparnacci, Diego Antonioli, Valentina Gianotti, Michele Laus, Michele Perego
Block copolymers (BCPs) are emerging as a cost-effective nanofabrication tool to complement conventional optical lithography because they self-assemble in highly ordered polymeric templates with well-defined sub-20-nm periodic features. In this context, cylinder-forming polystyrene-block-poly(methyl methacrylate) BCPs are revealed as an interesting material of choice because the orientation of the nanostructures with respect to the underlying substrate can be effectively controlled by a poly(styrene-random-methyl methacrylate) random copolymer (RCP) brush layer grafted to the substrate prior to BCP deposition...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28183594/a-novel-nano-hydroxyapatite-pmma-hybrid-scaffolds-adopted-by-conjugated-thermal-induced-phase-separation-tips-and-wet-chemical-approach-analysis-of-its-mechanical-and-biological-properties
#15
Radha G, Balakumar S, Balaji Venkatesan, Elangovan Vellaichamy
In this study, we report the preparation of nano-hydroxyapatite (nHAp) incorporated poly(methyl methacrylate) (PMMA) scaffolds by conjugated thermal induced phase separation (TIPS) and wet-chemical approach, which essentially facilitates the enhancement of both mechanical as well as biological properties of the scaffolds. The dissolution of PMMA was accomplished by acetone (Ace scaffold), ethanol-water (E-W scaffold) and isopropanol-water (I-W scaffold) mixtures as solvents. The existence of nHAp in PMMA matrix was investigated systematically...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28178796/diffusion-of-copolymers-composed-of-monomers-with-drastically-different-friction-factors-in-copolymer-homopolymer-blends
#16
Edward R Duranty, Jörg Baschnagel, Mark Dadmun
Copolymers are commonly used as interface modifiers that allow for the compatibilization of polymer components in a blend. For copolymers to function as a compatibilizer, they must diffuse through the matrix of the blend to the interface between the two blend components. The diffusivity of a copolymer in a blend matrix therefore becomes important in determining good candidates for use as compatibilizers. In this work, coarse-grained Monte Carlo simulations using the bond fluctuation model modified with an overlap penalty have been developed to study the diffusive behavior of PS/PMMA random copolymers in a PMMA homopolymer blend...
February 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28177026/a-co-monolayer-first-principles-design-of-a-new-direct-band-gap-semiconductor-with-excellent-mechanical-properties
#17
Zi-Wei Teng, Chun-Sheng Liu, Xiao-Hong Yan
Group V monolayers, e.g., nitrogene, phosphorene, arsenene, and antimonene have recently emerged as attractive candidates for electronic and optoelectronic applications. However, these pristine monolayers are not able to possess direct band gaps suitable for ultraviolet-blue photoresponse. First-principles calculations show that the Pmma-CO monolayer has a direct band gap of 2.4 eV, and predict that the system has a good stability. Unlike an easy direct-indirect gap transition under small strains in phosphorene, the direct band gap feature of Pmma-CO is maintained under a strain up to 12%...
February 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28171720/transparent-and-high-refractive-index-thermoplastic-polymer-glasses-using-evaporative-ligand-exchange-of-hybrid-particle-fillers
#18
Zongyu Wang, Zhao Lu, Clare Mahoney, Jiajun Yan, Rachel Ferebee, Danli Luo, Krzysztof Matyjaszewski, Michael R Bockstaller
The development of high refractive index glasses on the basis of commodity polymer thermoplastics presents an important requisite to the further advancement of technologies ranging from energy efficient lighting to cost efficient photonics. This contribution presents a novel particle dispersion strategy that enables the uniform dispersion of zinc oxide (ZnO) particles in poly(methyl methacrylate) (PMMA) matrix to facilitate hybrid glasses with inorganic content exceeding 25% by weight, optical transparency in excess of 0...
February 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28168347/local-and-systemic-diffusion-of-antineoplastic-drugs-following-vertebroplasty-using-acrylic-cement-mixed-with-cisplatin-or-methotrexate-experimental-study-in-pigs
#19
Rafael Llombart-Blanco, Carlos Villas, Álvaro Silva, Azucena Aldaz, Iñigo Navarro, Jeronimo Forteza, Salvador Martin Algarra, Matías Alfonso
PURPOSE: To determine the efficacy of cisplatin- or methotrexate-containing acrylic cement for local and systemic antineoplastic drug diffusion. Among the uses of acrylic cement or Polymethylmethacrylate (PMMA), there is the possibility to employ it as vehicle for drug diffusion. This capability is of interest in the treatment of pathological fractures: The curative effects of the cement (cytotoxicity of the monomer and increased temperature) are added to the antineoplastic effect of the drugs...
February 6, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28163262/characterization-and-electrolytic-cleaning-of-poly-methyl-methacrylate-residues-on-transferred-chemical-vapor-deposited-graphene
#20
Jianbo Sun, Harry O Finklea, Yuxin Liu
Poly(methyl methacrylate) (PMMA) residue has long been a critical challenge for practical applications of the transferred chemical vapor deposited (CVD) graphene. Thermal annealing is empirically used for the removal of the PMMA residue; however experiments imply that there are still small amounts of residues left after thermal annealing which are hard to remove with conventional methods. In this paper, the thermal degradation of the PMMA residue upon annealing was studied by Raman spectroscopy. The study reveals that post-annealing residues are generated by the elimination of methoxycarbonyl side chains in PMMA and are believed to be absorbed on graphene via the π-π interaction between the conjugated unsaturated carbon segments and graphene...
March 24, 2017: Nanotechnology
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