تم في هذا العمل تحضير عدة عينات من أكسيد السيليسيوم على شكل كسيروجل
اويروجل بدءاً من مواد أولية مختلفة و باعتماد طرق مختلفة للتجفيف. حيث حضر جزء
من العينات باستخدام سيليكات الصوديوم المائية (الماء الزجاجي) كمادة أولية و هي
مادة اقتصادية رخيصة الثمن، بينما حضرت العينات الباقية باستخدام تترا إيتوكسي سيلان.
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).
References used
G.M. Pajonk, Aerogel Catalysts: Applied Catalysis, 72 (1991) 217-266
S. Bhagat, Y. Kim, K. Suh, Y. Ahn, J. Yeo and J. Han, "Superhydrophobic silica aerogel powders with simultaneous surface modification, solvent exchange and sodium ion removal from hydrogels", Microporous and Mesoporous Materials, vol. 112, no. 1-3, pp. 504-509, 2008
H. Liu, W. Sha, A. Cooper and M. Fan, "Preparation and characterization of a novel silica aerogel as adsorbent for toxic organic compounds", Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 347, no. 1-3, pp. 38-44, 2009
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 (gla
The Xerogel alumina catalyst was prepared by sol-gel
method in non-aqueous milieu, and the aerogel alumina
catalyst was prepared in the same method but it was dried at
by supercritical conditions. These catalysts were characterized
by XRD, BET, a
Surface protective thin layers of high temperature oxidation resistant aluminum
oxide Al2O3, have been prepared by the sol-gel processing, using the spin coating
method. In order to increase layer thickness, corundum suspension was added to
the al
Phenol derivatives have been reacted with aryl halides under
heterogeneous basic catalyst (Amberlyst-21) using 5 mol% Cu(I)
Complex as catalyst, [CuClPPh3]4. The typical reaction has been
performed between p-cresol and bromobenzene. This reaction
الهدف من البحث:
تصميم و تنفيذ منظومة توضيع بالترذيذ فوق الصوتي باستعمال جهاز ترذيذ منزلي
لتوليد الرطوبة، بغية الحصول على حمُسات كيميائية بوليميرية ذات بنى نانوية بدءاً من
مُلول البولي بيرول الناقل المصطنع بالأكسدة الكيميائية وفق نسب مولية مختلفة.