جستجوی مقالات مرتبط با کلیدواژه « فرایند سل » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

Organic polymer aerogels have received much attention due to the recent development in industrial application of aerogels. A lot of researches have been done about the synthesis of various organic polymer aerogels and carbon aerogels. This paper presents a brief review of the literature on synthesis methods of resorcinol-formaldehyde, polyurethane, cellulose and carbon aerogels. Since structure and properties of organic aerogels are influenced by synthetic conditions, the effect of temperature, PH of solutions, catalysts and monomer concentrations are discussed.

Er doped ZnO layers have many applications in optical communications. Transparent Er-doped ZnO thin films were deposited on soda-lime glass substrates by sol-gel method. To optimize the properties, different amounts of Er dopant and temperatures were used. The prepared nano-layers were characterized by XRD and spectrophotometery. Allcoatings showed ZnO hexagonal wurtzite crystal structure with 14-19nm particle size and very good transmittance (80%) in the range of 750-1750 nm. The maximum optical transmission was achieved by ZnO film doped with 3.0 wt.% Er and post-heat-treated in air at 550􀁱C. J. Color Sci. Tech. 1(2007), 41-47. © Institute for Colorants, Paint andCoatings.