The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Melissa A. Johnson - One of the best experts on this subject based on the ideXlab platform.
-
Design of thin-film Polyvinylidene fluoride sensor rosettes for isolation of various strain components
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Shreyes N. Melkote, John B. Morehouse, James B. Castle, James W. Fonda, Melissa A. JohnsonAbstract:Thin-film Polyvinylidene fluoride piezoelectric sensors have long been recognized as a promising alternative to traditional metal foil strain gauges in applications where only dynamic or quasistatic signals are of interest. Compared to metal foil strain gauges, Polyvinylidene fluoride sensors feature high sensitivity, high dynamic range, and broad frequency bandwidth. However, transverse sensitivity of the Polyvinylidene fluoride sensor is higher than that of a metal foil strain gauge, making it more difficult to isolate a particular strain component or a deformation mode when the host structure is under complex loading. In addition, Polyvinylidene fluoride films are sensitive to changes in ambient temperature due to the pyroelectric effect. In this article, three temperature-compensated Polyvinylidene fluoride sensor rosette designs are proposed for isolating specific strain component(s) and deformation mode(s) of interest. First-principles based models are derived to relate the Polyvinylidene fluoride s...
Drew Sinha - One of the best experts on this subject based on the ideXlab platform.
-
A Surface Study of Polyvinylidene Fluoride Pipe Exposed to High‐Purity Water Containing Dissolved Ozone
Journal of The Electrochemical Society, 1997Co-Authors: Drew SinhaAbstract:Ultrapure water containing dissolved ozone is being increasingly considered for providing contamination-free environment required for advanced wet chemical processing of wafers. Fluoropolymers, including Polyvinylidene fluoride, have become industry standard materials for the construction of piping and components used in the distribution of ozonated ultrahigh-purity water for the semiconductor industry. In order to determine the chemical stability of Polyvinylidene fluoride in the presence of dissolved ozone, we used a number of complementary analytical techniques: scanning electron microscopy with energy dispersive spectroscopy, angle-resolved x-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectroscopy, and ion sputtering for chemical characterization of the Polyvinylidene fluoride pipe surface. Both qualitative and quantitative information obtained from these analyses revealed a loss of fluorine with minor surface oxidation. This was found to be limited to several monolayers near the surface of the ozone-treated polyvinyldiene fluoride pipe. The loss of fluorine is explained via a dehydrofluorination mechanism which normally initiates via free radicals produced by interaction of ozone with Polyvinylidene fluoride. Implications of such surface reactions for wet chemical cleaning of wafers for the semiconductor industry are discussed.
Michio Yokoyama - One of the best experts on this subject based on the ideXlab platform.
-
Studies on adhesion of fish meat products to casing in retort sterilized fish sausage-IV. Effect of surface properties of plastic casings on meat adhesion of retort sterilized fish sausage.
Nippon Suisan Gakkaishi, 1991Co-Authors: Hajime Nishino, Mikio Tanaka, Michio YokoyamaAbstract:The degree of meat adhesion to different kinds of plastic casings was examined in retort sterilized fish sausages. It was found that the plastic casings of great wettability such as Polyvinylidene chloride, Polyvinylidene fluoride, polyester and polyamide brought about greater meat adhesion than the ones of low wettability such as polyethylene and polypropylene. If polyethylene casing was modified on its surface by corona discharge or ultraviolet radiation, it brought about much greater meat adhesion than non-modified one. The meat adhesion of modified Polyvinylidene chloride which was introduced -COOH groups to the surface of casings became greater. In these two cases the important factors of meat adhesion were not only the wettability but also the functional group introduced to surface of casings. On the other hand, rough surface plastic casings brought about a little greater meat adhesion than smooth surface ones. Physical roughness of plastic casings had less effect on meat adhesion than chemical factor such as functional group.
Yukihide Iwamoto - One of the best experts on this subject based on the ideXlab platform.
-
Comparison of mechanical properties of Polyvinylidene fluoride and polypropylene monofilament sutures used for flexor tendon repair.
Journal of Hand Surgery (European Volume), 2001Co-Authors: A. Wada, Hideaki Kubota, H. Hatanaka, Hiromasa Miura, Yukihide IwamotoAbstract:We performed an experimental study to evaluate the mechanical properties of Polyvinylidene fluoride sutures and to compare their use with that of standard polypropylene sutures for the circumferential, epitendinous suture of a flexor tendon repair. Polyvinylidene fluoride sutures had a smaller suture diameter, a greater knot pull strength and less delayed extension when under creep testing, than polypropylene sutures. Tendons repaired using Polyvinylidene fluoride sutures had significantly greater gap and breaking strengths than those repaired using polypropylene sutures.
Junhao Chu - One of the best experts on this subject based on the ideXlab platform.
-
Transition of the polarization switching from extrinsic to intrinsic in the ultrathin Polyvinylidene fluoride homopolymer films
Applied Physics Letters, 2014Co-Authors: Jianlu Wang, Liu Boting, Xuewei Zhao, Bobo Tian, Youming Zou, Shuo Sun, Hong Shen, Jinglan Sun, Xiangjian Meng, Junhao ChuAbstract:Polyvinylidene fluoride homopolymer thin films have been prepared by the Langmuir-Blodgett technique, and their electrical properties have comprehensively been studied. The Polyvinylidene fluoride homopolymer films show better ferroelectricity with higher polarization and higher breakdown electric field than that of the poly(vinylidene fluoride-trifluoroethylene) copolymer films. Inspection on the thickness dependence of the coercive field of the Polyvinylidene fluoride films suggests an extrinsic polarization switching occurs in the thickness range from 200 to 45 nm, and a non-extrinsic switching is observed in the range between 45 and 11 nm, which is ascribed to the transition range from extrinsic to intrinsic switching.
