توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Ag\PMMA nanocomposite through reduction of silver ions by butylated hydroxytoluene
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Silver nanoparticles (Ag NPs) were efficiently generated by insitu reduction of silver ions via butylated hydroxytoluene (BHT) in poly(methyl methacrylate). Optical properties of the Ag\PMMA nanocomposite were investigated. The role of temperature on the reduction activity of BHT and the yield of produced Ag NPs were also indicated by the UV–vis spectroscopy. Further characterizations of the Ag\PMMA by TEM, SEM, XRD, and FTIR indicated that Ag NPs with a mean diameter of about 30 nm were dispersed in PMMA matrix with a relatively uniform distribution. A provisional reduction mechanism was proposed for the formation of the Ag NPs.<\div>

۲Dependence of Spectroscopy Properties of Copper Oxide into the Silica Support Nanocomposite on Temperature
نویسنده(ها): ، ، ،
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Various concentrations of copper are embedded into silica matrix to xerogels form using copper source Cu(NO3)2·3H2O. The xerogel samples are prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) by the sol–gel method and with determination of new molar ratio of components H2O\TEOS to be 6.2. In this investigation, the necessary amounts of trihydrated copper nitrate is added to the solution in such a manner that the concentration of the copper oxide in final solution reach to 1, 2 and 5 wt% (samples A, B and C respectively). After ambient drying, the gel samples are heated from 60 to 1000C at a slow heating rate (50°C\h). The absorption and transmittance spectrum of various concentrations of copper are studied by Uv–vis spectrophotometer. Thermal treatment effects are characterized by FTIR, TGA and TEM methods at different temperatures.<\div>

۳Poly(methyl methacrylate)\ acid functionalized silica nanocomposite electrolytes for rechargeable lithium batteries
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس نانوساختارها، سال
تعداد صفحات: ۴
Solid electrolyte based on plasticized poly(methylmethacrylate) and acid functionalized silica were fabricated and evaluated for applicability in secondary lithium batteries. Surface of silica nanoparticles modified using chlorosulfonic acid. Ion conductivity of nanocomposites was improved with increasing filler loading up to 10wt% and then decreased. The maximum conductivity value was about 1.19×10–3 S.cm–1 in comparison with 3.63×10–5 S.cm–1 for pure electrolytes at 25°C. Solid polymeric electrolytes showed higher conductivity at elevated temperatures and reach to 2.91×10–3 S.cm–1 for films composed of 15wt% of functionalized silica at 70°C. It was suggested that improvement of transportation properties could be due to acid–base interaction between sulfone groups of modified silica with salt and polymer. According to the results, plastisized poly(methylmethacrylate) and acid functionalized silica nanocomposite electrolytes, could be considered as high–performance electrolyte for secondary lithium–polymer batteries.<\div>
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