تحضير ودراسة بنيوية لأيروجيل أكسيد السيليسيوم بطريقة Sol-gel المستخدم كعازل أو كحفاز في عمليات تنقية المياه

In this research, several samples of silicon oxide were prepared in the form of aerogel and xerogel, starting from different raw materials and using different drying methods. Where a part of the samples was prepared using aqueous sodium silicate (glass water) (Na2SiO3) as a raw material, which is an economical and cheap material, while the rest of the samples were prepared using tetraethoxysilane (TEOS). Some of these samples were surface modified before drying using Trimethylchlorosilane, which is high Price (TMCS) by replacing the surface silanol groups (Si-OH) with alkyl. As for the remaining samples, which were prepared without surface modification, we succeeded in obtaining aerogel with a lower preparation cost and very close characteristics to the samples prepared by surface modification.

Preparation and Caractarization Of Silica Aerogel By Using Sol-gel method

During this study, various types of silicon oxide were prepared as aerogel and xerogel using multiple precursors and different drying technics. Some of these samples were prepared from Sodium silicate (waterglass) Na2SiO3 as a precursor which is a cheap material, while others were prepared using tetraethoxysilane (TEOS).

The Effect of Annealing on the Crystalline Structure of TiO2 Thin Films

The thin films of TiO2 were prepared by the Sol-Gel, on glass subtracts by using the following initial solutions: trichlorethylene titanium, ethanol, sodium hydroxide and hydrochloric acid and distilled water. The films were annealed at temperatures(200- 300- 400-500)c° for 1 hour. The structure of the prepared and annealed films were studied by XRD. The XRD rusltes showed that the films prepared crystallize according to orthorhombic Structure.Lattice constants were calculated and it was found that it was consistent with the data JPCDS and with some scientific works.