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https://www.readbyqxmd.com/read/28670899/poly-alkyl-methacrylate-brush-grafted-silica-nanoparticles-as-oil-lubricant-additives-effects-of-alkyl-pendant-groups-on-oil-dispersibility-stability-and-lubrication-property
#1
Bryan T Seymour, Roger A E Wright, Alexander C Parrott, Hongyu Gao, Ashlie Martini, Jun Qu, Sheng Dai, Bin Zhao
This article reports on the synthesis of a series of poly(alkyl methacrylate) brush-grafted, 23 nm silica nanoparticles (hairy NPs) and the study of the effect of alkyl pendant length on their use as oil lubricant additives for friction and wear reduction. The hairy NPs were prepared by surface-initiated reversible addition-fragmentation chain transfer polymerization from trithiocarbonate chain transfer agent (CTA)-functionalized silica NPs in the presence of a free CTA. We found that hairy NPs with sufficiently long alkyl pendant groups (containing >8 carbon atoms, such as 12, 13, 16, and 18 in this study) could be readily dispersed in poly(alphaolefin) (PAO), forming clear, homogeneous dispersions, and exhibited excellent stability at low and high temperatures as revealed by visual inspection and dynamic light scattering studies...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28657292/plasma-functionalized-polytetrafluoroethylene-nanoparticles-for-improved-wear-in-lubricated-contact
#2
Vinay Sharma, Richard Timmons, Ali Erdemir, Pranesh B Aswath
Plasma-functionalized polytetrafluoroethylene (PTFE) nanoparticles were employed to evaluate their utility in improving the lubrication property of a group III mineral oil with a significantly low amount of zinc dialkyl dithiophosphate (ZDDP). The particles were coated with two consecutive films; the initial coating contained silica to enhance amorphous glassy tribofilm formation, followed by a methacrylate film to protect the silica coating and enhance dispersibility in the oil. The functionalized nanoparticles were evaluated for their tribological performance using a high-frequency reciprocating rig, in a cylinder-on-flat configuration...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28576053/antibacterial-sno2-nanorods-as-efficient-fillers-of-poly-propylene-fumarate-co-ethylene-glycol-biomaterials
#3
Ana M Díez-Pascual, Angel L Díez-Vicente
Antibacterial and biocompatible SnO2 nanorods have been easily synthesized through a hydrothermal process with the aid of a cationic surfactant, and incorporated as nanoreinforcements in poly(propylene fumarate-co-ethylene glycol) (P(PF-co-EG)) copolymer crosslinked with N-vinyl-pyrrolidone (NVP) by sonication and thermal curing. The nanorods were randomly and individually dispersed inside the P(PF-co-EG) network, and noticeably increased the thermal stability, hydrophilicity, degree of crystallinity, protein absorption capability as well as stiffness and strength of the matrix, whilst decreased its level of porosity and biodegradation rate...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28575980/laser-textured-co-cr-mo-alloy-stored-chitosan-poly-ethylene-glycol-composite-applied-on-artificial-joints-lubrication
#4
Hailin Lu, Shanshan Ren, Junde Guo, Yue Li, Jianhui Li, Guangneng Dong
Arthroplasty brings the wear problems because of body fluid has poor performance as lubricant. Lubricant which is used in artificial joints will rapidly degrade and be absorbed by human body after injecting. To prolong the lubricant's effectiveness, this study prepared chitosan/poly(ethylene glycol) (CS/PEG) and textures to play a role in joint lubrication and wear protection. Chitosan (CS) and poly(ethylene glycol) which have biocompatibility and biodegradability properties can be used in human body. The tribological results shown that CS/PEG sol has excellent performance when this sol was composed by 2wt% CS and 30wt% PEG, the average friction coefficient below 0...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28485068/wear-resistance-of-poly-2-methacryloyloxyethyl-phosphorylcholine-grafted-carbon-fiber-reinforced-poly-ether-ether-ketone-liners-against-metal-and-ceramic-femoral-heads
#5
Shihori Yamane, Masayuki Kyomoto, Toru Moro, Masami Hashimoto, Yoshio Takatori, Sakae Tanaka, Kazuhiko Ishihara
Younger, active patients who undergo total hip arthroplasty (THA) have increasing needs for wider range of motion and improved stability of the joint. Therefore, bearing materials having not only higher wear resistance but also mechanical strength are required. Carbon fiber-reinforced poly(ether ether ketone) (CFR-PEEK) is known as a super engineering plastic that has great mechanical strength. In this study, we focused on poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC)-grafted CFR-PEEK and investigated the effects of PMPC grafting and the femoral heads materials on the wear properties of CFR-PEEK liners...
May 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28412447/improved-release-of-triamcinolone-acetonide-from-medicated-soft-contact-lenses-loaded-with-drug-nanosuspensions
#6
Eva García-Millán, Mónica Quintáns-Carballo, Francisco Javier Otero-Espinar
Drug nanosuspensions (NSs) show a significant potential to improve loading and release properties of the poorly water soluble drug triamcinolone acetonide (TA) from poly(hydroxyethyl methacrylate) (pHEMA) soft contact lenses. In this work, TA NSs were developed by a controlled precipitation method using a fractional factorial Plackett-Burmann design. Poloxamer 407 (PL) and polyvinyl alcohol (PVA) as stabilizing agents were selected. NSs were characterized in terms of their drug content, particle size and morphology...
April 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28397530/comparison-of-fixation-techniques-of-3d-woven-poly-%C3%AF%C2%B5-caprolactone-scaffolds-for-cartilage-repair-in-a-weightbearing-porcine-large-animal-model
#7
James M Friedman, Mackenzie L Sennett, Marcelo B Bonadio, Kerry O Orji, Alexander L Neuwirth, Niobra Keah, James L Carey, Franklin T Moutos, Bradley T Estes, Farshid Guilak, Henning Madry, Robert L Mauck, George R Dodge
Objective To test different fixation methods of a 3-dimensionally woven poly(ϵ-caprolactone) (PCL) scaffold within chondral defects of a weightbearing large animal model. Methods Full thickness chondral defects were made in the femoral condyles of 15 adult male Yucatan mini-pigs. Two surgical approaches were compared including total arthrotomy (traditional) and a retinaculum-sparing, minimally invasive surgery (MIS) approach. Following microfracture (MFX), scaffolds were placed without fixation or were fixed with fibrin glue, suture, or subchondral anchor...
April 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28263442/the-effects-of-presence-of-a-backside-screw-hole-on-biotribological-behavior-of-phospholipid-polymer-grafted-crosslinked-polyethylene
#8
Kenichi Watanabe, Toru Moro, Masayuki Kyomoto, Kenichi Saiga, Shuji Taketomi, Yuho Kadono, Yoshio Takatori, Sakae Tanaka, Kazuhiko Ishihara
One of the important factors in determining the success of joint replacement is the wear performance of polyethylene. Although highly crosslinked polyethylene (CLPE) is presently used, it is still not adequate. We have developed a surface modification technology using poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) in an attempt to improve wear performance. In this study, we evaluated the wear and creep deformation resistances of 3-mm and 6-mm thick PMPC-grafted CLPE disks, set on a metal back-plate, with and without a sham screw hole...
March 6, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28254324/modification-of-ti6al4v-implant-surfaces-by-biocompatible-tio2-pcl-hybrid-layers-prepared-via-sol-gel-dip-coating-structural-characterization-mechanical-and-corrosion-behavior
#9
Michelina Catauro, Flavia Bollino, Roberto Giovanardi, Paolo Veronesi
Surface modification of metallic implants is a promising strategy to improve tissue tolerance, osseointegration and corrosion resistance of them. In the present work, bioactive and biocompatible organic-inorganic hybrid coatings were prepared using a sol-gel dip coating route. They consist of an inorganic TiO2 matrix in which different percentages of poly(ε-caprolactone) (PCL), a biodegradable and biocompatible polymer, were incorporated. The coatings were used to modify the surface of Ti6Al4V substrates in order to improve their wear and corrosion resistance...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183604/wear-behaviour-of-uhmwpe-reinforced-by-carbon-nanofiller-and-paraffin-oil-for-joint-replacement
#10
Samy Yousef, Annamaria Visco, Giovanna Galtieri, Davide Nocita, Claudia Espro
The majority of artificial joints incorporate biomedical grade Ultra High Molecular Weight Poly Ethylene (UHMWPE), whose wear is considered most important in controlling service time of the whole joint. The aim of this work was to improve wear resistance of UHMWPE through the addition of 0.5-2.0wt% of Carbon Nano Filler (CNF) and 2% wt of Paraffin Oil (PO) using ball milling (BM) and extrusion techniques (EX). The wear tests on these nanocomposites were conducted by a pin on disc in dry (air) and wet media (simulated synovial fluid or artificial lubricant, and bovine synovial fluid or natural lubricant)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183011/semi-degradable-porous-poly-vinyl-alcohol-hydrogel-scaffold-for-cartilage-repair-evaluation-of-the-initial-and-cell-cultured-tribological-properties
#11
Yi Cao, Dangsheng Xiong, Kun Wang, Yuxiang Niu
Tissue engineering for articular cartilage repair has shown success in ensuring the integration of neocartilage with surrounding tissue, but the rapid restoration of biomechanical and biotribological functions remains a significant challenge. Poly (vinyl alcohol) (PVA) hydrogel is regarded as a potential articular cartilage replacement for its fair mechanical strength and low surface friction, while its lack of bioactivity limits its utility. Combining the advantages of tissue engineering materials and PVA hydrogel, we developed a semi-degradable porous PVA hydrogel through addition of ploy (lactic-co-glycolic acid) (PLGA) microspheres and salt-leaching technique...
February 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28032543/candida-albicans-biofilm-heterogeneity-does-not-influence-denture-stomatitis-but-strongly-influences-denture-cleansing-capacity
#12
Lindsay E O'Donnell, Hasanain K A Alalwan, Ryan Kean, Gareth Calvert, Christopher J Nile, David F Lappin, Douglas Robertson, Craig Williams, Gordon Ramage, Leighann Sherry
Approximately 20  % of the UK population wear some form of denture prosthesis, resulting in denture stomatitis in half of these individuals. Candida albicans is primarily attributed as the causative agent, due to its biofilm -forming ability. Recently, there has been increasing evidence of C. albicans biofilm heterogeneity and the negative impact it can have clinically; however, this phenomenon has yet to be studied in relation to denture isolates. The aims of this study were to evaluate C. albicans biofilm formation of clinical denture isolates in a denture environment and to assess antimicrobial activity of common denture cleansers against these tenacious communities...
January 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28004915/high-energy-dissipation-performance-in-epoxy-coatings-by-the-synergistic-effect-of-carbon-nanotube-block-copolymer-conjugates
#13
Hernan Garate, Micaela Bianchi, Lía I Pietrasanta, Silvia Goyanes, Norma B D'Accorso
Hierarchical assembly of hard/soft nanoparticles holds great potential as reinforcements for polymer nanocomposites with tailored properties. Here, we present a facile strategy to integrate polystyrene-grafted carbon nanotubes (PSgCNT) (0.05-0.3 wt %) and poly(styrene-b-[isoprene-ran-epoxyisoprene]-b-styrene) block copolymer (10 wt %) into epoxy coatings using an ultrasound-assisted noncovalent functionalization process. The method leads to cured nanocomposites with core-shell block copolymer (BCP) nanodomains which are associated with carbon nanotubes (CNT) giving rise to CNT-BCP hybrid structures...
December 22, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27821332/transparent-wear-resistant-superhydrophobic-and-superoleophobic-poly-dimethylsiloxane-pdms-surfaces
#14
Samuel Martin, Bharat Bhushan
Superoleophobic surfaces that exhibit self-cleaning, antifouling, low-drag, and anti-smudge properties with high transparency are of interest in industrial applications including optical devices, solar panels, and self-cleaning windows. In many superoleophobic surfaces created to date, the lack of mechanical durability has been an issue. In this work, for the first time, transparent, wear-resistant, superhydrophobic and superoleophobic surfaces were developed for polydimethylsiloxane (PDMS) using a simple and scalable fabrication technique...
February 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27813260/clinical-safety-and-wear-resistance-of-the-phospholipid-polymer-grafted-highly-cross-linked-polyethylene-liner
#15
Toru Moro, Yoshio Takatori, Sakae Tanaka, Kazuhiko Ishihara, Hiromi Oda, Yoon Taek Kim, Takashige Umeyama, Eisei Fukatani, Hideya Ito, Masayuki Kyomoto, Hirofumi Oshima, Takeyuki Tanaka, Hiroshi Kawaguchi, Kozo Nakamura
To reduce the production of wear particles and subsequent aseptic loosening, we created a human articular cartilage-mimicked surface for a highly cross-linked polyethylene liner, whose surface grafted layer consisted of a biocompatible phospholipid polymer, poly(2-methacryloyloxyethyl phosphorylcholine). Although our previous in vitro findings showed that poly(2-methacryloyloxyethyl phosphorylcholine)-grafted particles were biologically inert and caused no subsequent bone resorptive responses, and poly(2-methacryloyloxyethyl phosphorylcholine) grafting markedly decreased wear in hip joint simulator tests, the clinical safety, and in vivo wear resistance of poly(2-methacryloyloxyethyl phosphorylcholine)-grafted highly cross-linked polyethylene liners remained open to question...
November 3, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27783768/association-between-oral-health-status-and-central-obesity-among-brazilian-independent-living-elderly
#16
Carla Thais Rosada Peruchi, Regina Célia Poli-Frederico, Alexandrina Aparecida Maciel Cardelli, Marina de Lourdes Calvo Fracasso, Carina Gisele Costa Bispo, Rejane Dias Neves-Souza, Jefferson Rosa Cardoso, Sandra Mara Maciel
The aim of this study was to investigate the association between oral health status and central obesity (CO) in Brazilian independent-living elderly. A cross-sectional study was carried out in a sample of 489 elderly, who were participants of the Study on Aging and Longevity, in Londrina, state of Parana. The number of natural teeth and use of prostheses were evaluated according to the World Health Organization criteria. The presence of CO was assessed using measures of waist circumference (WC) and waist-hip ratio (WHR)...
October 24, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27766256/histopathological-analysis-of-peek-wear-particle-effects-on-the-synovial-tissue-of-patients
#17
A C Paulus, S Haßelt, V Jansson, A Giurea, H Neuhaus, T M Grupp, S Utzschneider
Introduction. Increasing interest developed in the use of carbon-fiber-reinforced-poly-ether-ether-ketones (CFR-PEEK) as an alternative bearing material in knee arthroplasty. The effects of CFR-PEEK wear in in vitro and animal studies are controversially discussed, as there are no data available concerning human tissue. The aim of this study was to analyze human tissue containing CFR-PEEK as well as UHMWPE wear debris. The authors hypothesized no difference between the used biomaterials. Methods and Materials...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27737459/friction-measurements-on-contact-lenses-in-a-physiologically-relevant-environment-effect-of-testing-conditions-on-friction
#18
Olof Sterner, Rudolf Aeschlimann, Stefan Zürcher, Kathrine Osborn Lorenz, Joseph Kakkassery, Nicholas D Spencer, Samuele G P Tosatti
Purpose: To characterize the effect of lubricant composition and in vitro ageing on the coefficient of friction (CoF) of a wide range of commercially available soft contact lenses (SCLs). Methods: The CoF of SCLs was characterized by means of microtribometry against a mucin-coated glass disk. One reusable (RU) silicone-hydrogel (SiHy) lens, senofilcon A, and two daily disposable (DD) lenses, etafilcon A (hydrogel) and nelfilcon A (hydrogel), were tested under different lubricant solutions, including a tear-like fluid (TLF) containing proteins and lipids...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27664023/extended-wear-therapeutic-contact-lens-fabricated-from-timolol-imprinted-carboxymethyl-chitosan-g-hydroxy-ethyl-methacrylate-g-poly-acrylamide-as-a-onetime-medication-for-glaucoma
#19
T S Anirudhan, Anoop S Nair, J Parvathy
An extended wear therapeutic contact lens (TCL) for the sustained delivery of timolol maleate (TML) was fabricated based on molecular imprinting technique. The designed TCL comprised of a TML imprinted copolymer of carboxymethyl chitosan-g-hydroxy ethyl methacrylate-g-polyacrylamide (CmCS-g-HEMA-g-pAAm) embedded onto a poly HEMA matrix (pHEMA). Successful reloading of TML onto the lens was monitored using a simple and novel UV-Visible spectrophotometric method which showed an excellent reloading capacity of 6...
December 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27650587/synthesis-and-characterization-of-a-zwitterionic-hydrogel-blend-with-low-coefficient-of-friction
#20
Allen O Osaheni, Eric B Finkelstein, Patrick T Mather, Michelle M Blum
Hydrogels display a great deal of potential for a wide variety of biomedical applications. Often times the performance of these biomimetic materials is limited due to inferior friction and wear properties. This manuscript presents a method inspired by the tribological phenomena observed in nature for enhancing the lubricious properties of poly (vinyl alcohol) (PVA) hydrogels. This was achieved by blending PVA with various amounts of zwitterionic polymer, poly ([2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide)) (pMEDSAH)...
September 17, 2016: Acta Biomaterialia
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