Papers by Keyword: Gradient Film

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Authors: Hong Ze Liu, Min Qi, Xing Hua Zhu, Zhi Yong Wei
Abstract: PLGA blend and gradient films were designed and prepared to improve the late degradation properties of PLGA films. The gradient films were composed of gradual components of PLGA50/50 and PLGA 75/25, and PLGA 50/50, featuring gradual descents from outside parts to inside parts of the films. Degradation processes of biodegradable PLGA blend and gradient films were also predicted by Monte Carlo simulation to understand the mechanism of degradation. The simulation results indicated that the gradient structure prolonged the mass transfer time of the degradable films, and it induced smoother weight loss than single-component or blend films. The degradation behaviors of single-component, blend and gradient films were experimentally investigated to prove the validity of the models by immersing them into PBS. The experiment indicated that the gradient films have the most stable weight loss curves, which were in well accordance with the simulation by Monte Carlo method.
331
Authors: R.M. Hausner, H. Baumann, Klaus Bethge, F. Noli, P. Misaelides
193
Authors: Xue Yan, M. Li, Jun Li, X. Cheng
Abstract: The Cu/ZrW2O8 gradient films have been deposited on silicon substrates by RF magnetron sputtering with copper and compound targets followed by annealing in argon atmosphere at 750 °C for 3 min. The three different compound targets were B1 (nZrO2:nWO3=1:2.2), B2 (nZrO2:nWO3=1:2.5) and B3 (ZrW2O8), respectively. The as-deposited gradient films were amorphous, while a post-deposition annealing at elevated temperature was required for the development of the cubic ZrW2O8. The structure and surface morphology of the gradient films were then studied using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS). The globular and slender rod crystals can be found in annealed films, which are copper and ZrW2O8, respectively. The fine gradient film should be obtained using the target B1.
1808
Authors: Liang Hu, Ou Sheng Zhang, Chao Can Zhang
Abstract: We investigated the effect of film-formation temperature and Tg’s difference on the self-stratification gradient silicone film prepared by emulsion blend (poly(3-[tris(trimethyl silyloxy)silyl] propyl methacrylate-co-methyl methacrylate) /poly(butyl acrylate-co-methyl methacrylate) 50/50 by wt) (PTRIS-co-MMA/PBA-co-MMA) technique. The self-stratification film with gradient distribution of silicon was relatively easily obtained when both blend components could fully fuse to form a continuous film. Moreover, proper nonparallel Tgs facilitated migration of the silicon component to the film-air interface during the film-formation and hence the gradient distribution was obtained. When Tg of silicon-free component was 40°C, self-stratification gradient film with concentration of silicon components varying in a gradient-like manner along the overall transaction of the film was fabricated.
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