Advanced Materials Research Vol. 1051

Abstract: 15^# nanosilvehas significantly bateriostatic effect against Penicillium, The minimal inhibitory concentrations of 15^# nana silve for inhabiting Penicillium is 1 mg/L. Through a comparative study of the bacteriostatic effect of different nanosilver and other bacteriostatic agents against Penicillium, it is found that the bacteriostatic effect of nanosilver against penicillium is very significantly better than lincomycin hydrochloride and streptomycin sulfate, in which, the bacteriostatic effect of nanosilver 14^# nanosilve against penicillium is significantly better than 13^# nanosilve, and 13^# nanosilve is very significantly better than that of 15^# nanosilve.It provides a new way for the prevention and control of Penicillium.

Abstract: A simple method to indium tin alloy and oxide nanowires were achieved by using the extrusion molding process in the air. Eutectic indium tin bulk were firstly injected into AAO templates. After dissolving AAO, the indium tin nanowires were collected in ethanol. Furthermore, in order to have oxide nanowires, alloy nanowires were directly oxidized by heat treatment in the air below its melting point for 24 hours. Finally, crystalline indium-tin oxide and indium oxide nanowires with diameters 90-110 nm and lengths 2-20 μm were obtained.

Abstract: In the development of carbonate reservoir, it usually uses acid fracturing to improve the production. Because of the limitation of, the production rates from the wells are very low. Based on the “stimulated reservoir volume” which is used in the development of unconventional reservoirs, combined with the characteristics of tight carbonate reservoirs, in the early stage with low viscosity liquid, large pump scheme, small size proppant and pulse type sand to form complex fracture network. In the later, with high viscosity liquid, high sand rate, large size proppant, and continuous type sand to enlarge the stimulated volume and conductivity. Based on the experimental evaluation, the fracture design was optimized, and it will provide a reference for the stimulation of tight carbonate reservoir.

Abstract: In this study, hydrophilic-oleophobic antireflective coatings with high transmittance were prepared via simplely mixing the base-catalyzed TEOS and acid-catalyzed MTES with different weight ratio. The refractive index of the AR coatings increase continuously from 1.23 to 1.44. When the weight ratio of acid-catalyzed MTES reached 60%, a hydrophilic-oleophobic antireflective coatings with a high transmittance of 99.09% can be obtained. The water contact angle and the oil contact angle of the coating are 113.8o and 74.4o, which can effectively prevent the absorption of water and polar organic molecules from the environment.

Abstract: Graphene oxide has been studied as sensing material for the humidity detection in this paper. At room temperature, graphene oxide was dissolved in water to prepare graphene oxide aqueous solution. This aqueous solution was distributed on the electrode surface of quartz crystal microbalance to form a thin film for humidity detection. The results of the experiment showed that the quartz crystal microbalance sensors with graphene oxide film have good response to the change of humidity. The maximum humidity sensitivity, during the humidity ranging from 10% to 90%RH (relative humidity), has achieved ~54Hz/%RH (relative humidity). The quartz crystal microbalance sensors with graphene oxide thin film have good stability and reproducibility properties. All results implied that the graphene oxide was a potential humidity sensing material for practical use.

Abstract: Using of petro-polymers such as polymethylmethacrylate, polypropylene and polyethylene in the world has been undergoing a critical problem due to significantly decreasing of petroleoum stock as monomer sources. Therefore reducing of the petro-polymer usage should be performed by using natural resources such as modified starches.This study reported addition of an acyl bromide compound to substitute hydroxyl groups on the starch obtains a macro initiator for graft-copolymerizing polymethylmethacrylate (PMMA) onto the functionalized starch as starch-g-PMMA through atomic transfer radical polymerization (ATRP) method. The starch activation through the substitution of the hydroxyl functional group creates ability of the starch to transfer a radical atom onto a petro-monomer such an alkylmethacrylate which furthermore polymerize into starch-g-PMMA at mild condition. This paper reported study of the starch activation describing about screening catalysts and acyl bromide compounds, optimizing process variables such as amount ratio of a selected acyl bromide compound to starch and temperature. The functionalized starchs were analysed by 13-CNMR, FTIR, titration and their morphology was observed by FE-SEM.

Abstract: Knowledge of acoustical properties of granular and fibrous sustainable materials has been stimulated thanks to their rather easy handling and durability. In this work direct measurements of the normal incidence sound absorption coefficient of three non consolidated materials (esparto fibers, cork and perlite) have been carried out using the so-called transfer function method. These materials are plentiful in Morocco and they require low amounts of energy for processing, which makes them attractive as either thermal insulating or sound absorbing materials. Results show that the acoustical efficiency of studied materials is comparable to traditional materials. In addition, an inverse estimation of non acoustical parameters (flow resistivity, tortuosity and porosity) of these materials has been performed introducing a new predictability approach. This is based on Global Sensitivity Analysis combined with Global Numerical Optimization Techniques, regarding most usual mathematical models.

Abstract: Bio-fibre composites are increasingly replacing conventional and synthetic composite materials for the past two decades. This is due to their abundant availability, high strength to weight ratio and bio-degradability. Suitable properties of natural fibres can be imparted by changing the orientation of the fibres during manufacturing process. This paper proposes a hybrid property of natural fibre composite made up of Manila and abaca fibres as reinforcing agents with epoxy resin as matrix .Hand lay-up process is used for manufacturing this composite laminate. Then the treated fibres with increased strength are used with epoxy LY556 resin with HY951 hardener under room temperature. Three different samples are prepared and their mechanical properties like impact and flexural strength are found. This hybrid composite is effectively developed for automobile and electrical applications.

Abstract: Silica sol-gel membranes have been developed for moderate temperature (300 °C) separation of hydrogen (H₂) from nitrogen (N₂), methane (CH₄) and argon (Ar) gas molecules. Tubular ceramic support with 15 nm nominal pore diameter and 45% porosity was modified by dip-coating method. Gas permeation characteristics were evaluated. Defect free silica layer over the substrate for hydrogen gas separation was obtained. Hydrogen gas permeate flux of 4.82x10^-1 mol/sec m² at 1.0 barg feed pressure was obtained. Selectivities of H₂ over N₂, CH₄ and Ar of 3.07, 2.23 and 3.75 at 300 °C, 200 °C and 300 °C and 0.9 barg were obtained with the silica membranes. The gas permeation and the selectivity performance of the membrane were evaluated.

Abstract: nanosized Ag/Ag₃PO₄ doped titanium dioxide (TiO₂) particulates (TiO₂-Ag/Ag₃PO₄) were synthesized by sol-gel process. TiO₂-Ag/Ag₃PO₄ was used to coat on the glass tubes interfaces to investigate the photocatalytic effect against Rhodamine B under simulated solar light. The calcination temperature and time, number of coating layers, dopant ratio of Ag was optimized. It is noted that the photocatalytic effect under simulated solar was 99.8% only for 60min, which is much higher than pure TiO₂. The hybrid material was characterized using X-ray diffractometer (XRD), SEM and UV–vis spectroscopy (UV–vis). By the result, it is noticed that pure Ag and Ag₃PO₄ particles were combined with TiO₂ nanoparticles, and TiO₂-Ag/Ag₃PO₄ thin film exhibited significantly better photocatalytic effect due to its narrow band gap energy (2.26 eV) and higher visible light absorbing ability. The stability of TiO₂-Ag/Ag₃PO₄ material was also investigated.