Papers by Keyword: Film

Abstract: The blended film of deproteinized natural rubber latex (DNRL) with hydroxypropyl methylcellulose (HPMC) and dibutylphthalate (DBP) provided good properties that suitable for pharmaceutical applications. However, this film had successfully been confirmed in transdermal use only for high skin permeable drugs. In this study, this film was further modified to look forward on the delivery of a low permeable drug. Glycols, one group of chemical penetration enhancer, were investigated to blend in this film in order to enhance the low permeable drug through the skin. Various concentrations (5, 10, 15, and 20 parts per hundred of rubber (phr)) of ethylene glycol (EG), propylene glycol (PG), and polyethylene glycol 400 (PEG400) were blended with DNRL/HPMC/ DBP mixtures before film construction by solution-casting technique. The modified films were evaluated in thickness, tensile strength, peel strength, tack adhesive, swelling and erosion ratios, moisture uptake, and compatibility. These blended films provided good characters in elasticity, adhesive properties, hydrophilicity, and compatibility. Their thickness could be controlled to be uniform. These new blended films were suitable to use in the further study for low permeable drug delivery through the skin.

Abstract: A europium (III) chelating polymer film has been investigated by fluorescence spectrum, lifetime measurement, near-field scanning optical microscopy (NSOM) and m-line method. The obtained film thickness is 1.748μm and refractive index is 1.571. Near-field scanning optical microscopy shows the good surface quality of the Europium (III) chelating polymer film.

Abstract: In this article, we report the surface modification results of Parylene C Film by solution of sodium naphthalene complex and its application. In this work, the function group and the crystal structure of the film were characterized separately with Attenuated Total Reflection Fourier transformation infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD).The result of test shows that the bond of carbon (C) and chlorine (Cl) is damaged; The crystalline of the film reduces, and the NaCl crystal exist on the film surface. The surface energy of the film is increased from 28.64mJ/m² to 41.48mJ/m², and the shearing tension of modified film was reached over 212.8kPa.The generalized analysis result indicated that nucleophilic reagent destructs the C-Cl bond on the benzene ring, the chlorine (Cl) atom on the benzene ring and the sodium ion in modified reagent forms the sodium chloride which adheres to the film surface.

Abstract: In todays animation films, virtual character animation is a research field developing rapidly in computer graphics, and motion capture is the most significant component, which has brought about revolutionary change for 3D animation production technology. It makes that animation producers are able to drive animation image models directly with the use of actors performance actions and expressions, which has simplified animation manufacturing operation greatly and enhanced quality for animation production.

Abstract: In this study, a method to generate arrays of Fe₃O₄ nanoparticles (MNPs) via block copolymer (BC) self-assembly was developed. A composite film of polystyrene-block-poly (2-vinylpyridine) (PS-b-P2VP)/MNPs was first prepared by spin-coating the PS-b-P2VP/MNPs mixed solution on a carbon substrate. After the composite film was annealed at high temperature for 2 days, it was found that the modified MNPs could be selectively incorporated into P2VP cylinders in PS-b-P2VP diblock copolymers and the P2VP cylinders were oriented parallel to the substrate. For a long time annealing (10 days), the P2VP cylinders become normal to the substrate and MNPs are located at the interface of P2VP and PS phases.

Abstract: Solutions of lyotropic cholesteric liquid crystalline hydroxypropyl cellulose (HPC) in water would be self-colored due to the selective reflection of visible light, depending on the solution concentration. Colored coating of the liquid crystalline aqueous HPC solutions was attempted to apply. HPC solid films were found which could cast from the liquid crystalline solutions at different conditions such as solution concentration and different drying temperature. Experiments show that both solution concentration and cooling velocity play an important effect in controlling the color of HPC films.

Abstract: Prepare TiO₂ doped with ZnO or Fe₂O₃ composite photocatalytic film by using sol-gel method and characterize its microstructure and light absorption performance with X-ray diffraction instrument (XRD), scanning electron microscopy (SEM) and UV-visible spectrophotometer. The results show that: particles of TiO₂ doped with Fe₂O₃ composite photocatalytic film are uniform and well dispersed; the rough surface of the film has a certain gap which is helpful for the adhesion of gas and liquid; the diameter of the particles is about 50 nm. The crystal grain size of TiO₂ film doped with ZnO is bigger, about 100 nm; the gap of the film is less and particles are nearly spherical and protruding, the shape of grain is structured. The absorption spectrum of TiO₂ doped with ZnO or Fe₂O₃ has a red shift and both of their absorption intensity is higher than that of pure TiO₂ film in the scope of the ultraviolet and visible region.

Abstract: This paper describes a modeling method for film thickness variation within plasma enhanced chemical vapour deposition (PECVD) processes. The model enables the identification and optimization of deposition process sensitivities to electrode configuration, deposition system design and gas flow distribution. An comparison between theory and experiment is provided for PECVD of diamond-like-carbon (DLC) deposition onto flat and curved substrate geometries. This process utilizes butane reactive feedstock with an argon carrier gas. Radio-frequency plasma is used. The PECVD deposition system is based on co-planar 300mm diameter electrodes with separate RF power matching to each electrode. The system has capability to adjust the electrode separation as a parameter to optimize uniformity. Vacuum is achieved using dry pumps with real time control of butterfly valve position for active pressure control. Deposited film thickness sensitivities to electrode geometry, plasma power density, and pressure and gas flow distribution are demonstrated. In addition to film thickness uniformity, optical, durability and environmental performance of resulting DLC on germanium substrate materialreported.

Abstract: The preparation, characterization, and environmental application of crosslinked porous chitosan films for Acid red (AR) adsorption have been investigated. The adsorbent was characterized by scanning electron microscope (SEM). The adsorption experiments were carried out in a batch system to optimize operation variables: contact time, Acid red concentration, temperature, and pH. The results indicated crosslinked porous chitosan films could successfully remove 96% of Acid red. The adsorption equilibrium isotherms showed that the sorption processes were better fitted by Langmuir equation.

Abstract: Poly(L-lactic acid) (PLA) is a biodegradable and bioabsorbable polymer which has many potential uses. However, PLA shows the poor toughness, slow degradation rate and relatively hydrophobic.Poly(ethylene glycol) (PEG) is widely used as a plasticizer and of great interest because it presents outstanding properties, e.g. solubility in water and also in some organic solvents, lack of toxicity and absence of antigenicity and immunogenicity, which are essential for biomedical applications. The aim of this study was to investigate the ability of high amount PEG 400 to improve the characteristics of PLA matrix film. PLA matrix films were prepared using a solvent casting method and their various properties were investigated. Mechanical properties were determined with texture analyzer. Contact angle and surface free energy were measured using the goniometer. From the mechanical properties evaluated (tensile strength (TS) and elongation at break (E)), all plasticized PLA films exhibited the softer behavior and the plasticized PLA films with150 % PEG 400 indicated the higher % elongation at break than pure PLA, significantly. The contact angle and surface free energy values indicated that PEG 400 could improve the wettability of solventsand also increase % water sorption and % weight loss with as dose dependent.Surprisingly, SEM photographs revealed more porous structure as the higher amount PEG 400 was incorporated in PLA film. This porous structure and density of developed plasticized PLA film could be modified with temperature change technique. Parameters affecting the 3-D porous plasticized PLA matrix were revealed in this study. The optimum condition for producing the continuous 3-D porous plasticized PLA matrix was obtained. This porous topography in PLA matrix film will be applied further as material in tissue engineering and drug delivery systems.