Study of the Relationship between Haze Performance and Fractal Dimension in Micro-Sized Segregated Liquid Crystals Embedded in a Polymer Matrix Consisting of a Thiol-ene Prepolymer and a Multi-Functional Acrylate

Micro-sized segregated liquid crystals (MSLCs) surrounded by a polymer medium can be used for haze film applications. When incident light passes through the MSLC film, the microsized particles act as light scattering centers. In this study, the results of the addition of a multi-functional acrylate to a commercial thiol-ene prepolymer system, as well as the morphology of (LC) droplets, fractal dimension (D), and the optical haze performance of the micro-sized segregated LCs formed by UV-initiated photopolymerization, are reported. With increasing fraction of the multi-functional acrylate within the host polymer matrix, the small scattering centers (LC droplets) also increase, giving rise to a large optical haze in the prepared film. The optical haze can be characterized by the D of the associated LC droplet morphology in the films. The optical haze and D exhibit a strong correlation; thus, a qualitative prediction of the optical haze is possible via geometric fractal analysis.

FABRICATION AND EVALUATION OF CHITOSAN-BASED FILM FORMING GEL OF ACECLOFENAC FOR TRANSDERMAL DRUG DELIVERY

The objective of the present study was to prepare a topical film-forming gel of aceclofenac for the treatment of rheumatic diseases, using a safe and effective drug delivery approach. Aceclofenac film-forming gels were prepared using hydroxypropyl methyl cellulose and chitosan polymeric blend in varying concentrations, polyethylene glycol 400 (PEG 400) as a plasticizer, Tween 80 as a permeation enhancer and ethanol as solvent. The prepared film-forming gels were evaluated and the influence of the concentration and ratio of polymeric blends, plasticizer, and ethanol used were investigated. All the prepared film-forming gels showed satisfactory properties regarding consistency, spreadability and thickness. Variation in the concentration of polymers, ethanol and PEG 400 showed a variable effect on drying time from film-forming gels. Film-forming gels of aceclofenac were successfully developed and may provide a promising effective formulation that may improve patient compliance.

EFFECT OF POLYMERIC BLEND ON EX-VIVO PERMEATION STUDIES OF ACECLOFENAC LOADED FILM FORMING GEL

Objective: To date, film-forming systems have been intensively investigated for transdermal drug delivery. Film-forming systems offers various advantages compared over conventional transdermal drug delivery systems. The objective of the present study was to study the effect of polymeric blend on ex-vivo permeation studies of topical film-forming gel of aceclofenac. Methods: Film-forming gels were prepared by using Hydroxypropyl methylcellulose and Eudragit polymeric blend in varied concentrations, polyethylene glycol 400 as plasticizer, ethanol as solvent and tween 80 as a penetration enhancer. The prepared film-forming gels were evaluated and the influence of the concentration and ratio of polymeric blends used plasticizer and ethanol were investigated. Results: All the prepared film-forming gels showed satisfactory properties regarding homogeneity, compatibility, viscosity and pH value. Variation in the concentration of polymers showed a variable effect on drug permeation rate from film-forming gels. Almost, all formulations permeated up to 80% of drug in 12 h and formulation F1 showed a maximum release about 97.54 % in 12 h. Conclusion: Film-forming gels of aceclofenac with sustained-release profile were successfully developed and may provide a promising effective formulation which may improve patient compliance.

A Polyimide-Based Flexible Monopole Antenna Fed by a Coplanar Waveguide

A 2.4 GHz flexible monopole antenna fed by a coplanar waveguide (CPW) was presented on polyimide (PI) as the dielectric substrate, which was fabricated by in situ self-metallization. The technology does not depend on expensive equipment or complex experimental environments, including hydrolysis, ion exchange, and reduction reaction. The measurement results show that the resonance frequency of the proposed antenna is 2.28 GHz, the bandwidth is 2.06–2.74 GHz, and the relative bandwidth is 28.33% under the flat state. The bending and folding test was also carried out. Whether it was flat, bent, or folded, the measured results met the requirements of the antenna. A fatigue test was carried out to illustrate that the prepared film has high mechanical flexibility, which expands the application field of antenna.

Nanofluid to Nanocomposite Film: Chitosan and Cellulose-Based Edible Packaging

Chitosan (CH)-based materials are compatible to form biocomposite film for food packaging applications. In order to enhance water resistance and mechanical properties, cellulose can be introduced to the chitosan-based film. In this work, we evaluate the morphology and water resistance of films prepared from chitosan and cellulose in their nanoscale form and study the phenomena underlying the film formation. Nanofluid properties are shown to be dependent on the particle form and drive the morphology of the prepared film. Film thickness and water resistance (in vapor or liquid phase) are clearly enhanced by the adjunction of nanocrystalline cellulose.

Preparation and Characterization of poly-aniline hydrochloride (PANI-HCL) Nano-composites by Radiation

During this search, the polymer poly-aniline hydrochloride (PANI-HCL) was prepared with different weights before and after irradiation in the form of films using the casting method. The films were recorded with the cobalt element(CO60), which sends a gama (1.2) Mev for a period of (72) hours. The structural properties of the (FT-IR) were studied. The results showed that the active groups of the recorded polymer were consistent with the chemical composition and topographic study of the prepared film surfaces. The images showed that the recorded polymer is homogeneous and its color changes after irradiation. The electrical properties included the measurement of the hall effect and the continuous electrical conductivity and the behavior of the current and voltages where the results showed that the Hall coefficient of the polymer mixture recorded before and after the irradiation are carriers of the (n-type) and through the measurement of current- voltages show results that the polymer recorded conduct the behavior of ohmic before irradiation and walk Conduction of a semiconductor after irradiation. In addition, the results of electrical conductivity were shown to be less after irradiation.

Effect of annealed temperature on some structural, optical and mechanical properties of selenium thin film

In this paper a thin films of selenium was prepare on substrates of n-Si by evaporation in a vacuum technique with thickness about 0.5μm. And then an annealing process was done on samples at two temperature (100 and 200) C ° in a vacuum furnace (10-3 torr).Some structural, optical and mechanical properties of prepared thin films were measured. Results showed that the prepared film was the crystallization, optical transmittance and micro hardness of the prepared thin films increased significantly after annealing.

A Biodegradable Ramie Fiber-Based Nonwoven Film Used for Increasing Oxygen Supply to Cultivated Soil

Plastic agricultural nonwoven films are traditionally used as covering materials, and are prone to cause various ecological problems due to their poor biodegradability. In this paper, a ramie fiber/starch nonwoven film was prepared, and was used as bedding material, that was covered by cultivated soil as opposed to covering it. The biodegradability and porosity characteristics of the film were analyzed, and its effect on oxygen supply to soil was investigated. Results showed that the prepared film had good biodegradability (65.6% after 72 days), and had a loose and porous structure, with the main pore size being in the range of 250–300 μm. After the soil moisture content was reduced to about 44%, the oxygen concentration in the soil that was in close contact with the film, which padded the bottom surface of the plate, rose sharply and then kept stable at 20.1%, whereas soil directly in contact with the plate remained extremely anoxic (0.2%). It was concluded that use of the prepared film increased the oxygen supply to the soil in contact with it, which sufficiently compensated for the oxygen consumption caused by soil microbial activities. Thus, the prepared film is very suitable in short-term plant cultivation within containers where anoxia often occurs.

PREPARATION OF POLY (METHYL METHACRYLATE) THIN FILMS BY SPIN COATING TECHNIQUE FOR OTFT AND WOUND HEALING APPLICATIONS

Thin films of poly (methyl methacrylate) (PMMA) were prepared on cleaned glass slides by using spin coating technique. The prepared films were identified by using FTIR spectrum. Surface morphology of the coated films was studied by using SEM and AFM. Both as grown and annealed films showed smooth and amorphous structure. It also revealed the absence of pits, pin holes and dendritic features in the surface. Both as grown and annealed films showed very low RMS roughness value. The morphology analysis revealed that the prepared film could be used as dielectric layer in thin film transistors and as drug delivery system forwound healing.

Increasing the performance of a superconducting spin valve using a Heusler alloy

We have studied superconducting properties of spin-valve thin-layer heterostructures CoO x /F1/Cu/F2/Cu/Pb in which the ferromagnetic F1 layer was made of Permalloy while for the F2 layer we have taken a specially prepared film of the Heusler alloy Co2Cr1− x Fe x Al with a small degree of spin polarization of the conduction band. The heterostructures demonstrate a significant superconducting spin-valve effect, i.e., a complete switching on and off of the superconducting current flowing through the system by manipulating the mutual orientations of the magnetization of the F1 and F2 layers. The magnitude of the effect is doubled in comparison with the previously studied analogous multilayers with the F2 layer made of the strong ferromagnet Fe. Theoretical analysis shows that a drastic enhancement of the switching effect is due to a smaller exchange field in the heterostructure coming from the Heusler film as compared to Fe. This enables to approach an almost ideal theoretical magnitude of the switching in the Heusler-based multilayer with a F2 layer thickness of ca. 1 nm.