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Register a new userتحضير ودراسة بنيوية لأيروجيل أكسيد السيليسيوم بطريقة Sol-gel المستخدم كعازل أو كحفاز في عمليات تنقية المياه
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Aِl-Baath University رسالة ماجستير
Publication date
2018
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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تم في هذا البحث تحضير عدة عينات من أكسيد السيليسيوم على شكل ايروجل وكسيروجل بدءاً من مواد أولية مختلفة وباعتماد طرق مختلفة للتجفيف . حيث حضر جزء من العينات باستخدام سيليكات الصوديوم المائية ( الماء الزجاجي ) ( Na2SiO3) كمادة أولية وهي مادة اقتصادية رخيصة الثمن بينما حضرت العينات الباقية باستخدام تترا إيتوكسي سيلان ( TEOS ) أجريت على بعض هذه العينات عملية تعديل سطحي قبل التجفيف باستخدام تري ميتيل كلوروسيلان وهو مترفع الثمن ( TMCS ) وذلك من خلال استبدال مجموعات السيلانول السطحية ( Si-OH ) بالإلكيل . اما العينات الباقي حضرت دون إجراء التعديل السطحي فنجحنا في الحصول على أيروجيل بتكلفة تحضير منخفضة أكثر وخصائص قريبة جداً من العينات المُحضرة بالتعديل السطحي .
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.
References used
Aerogels Handbook 2011
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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).
ZnCo2O4 spinel was successfully prepared via co-precipitation
process starting from corresponding metal chlorides in aqueous
solutions at pH=13. Different calcination temperatures (400-500-
600-700-800-1000oC) and different Zn:Co molar ratios (1:2
- 1:2.5) were applied in an effort to prepare this important spinel with perfect specifications starting from cheap, easy to handle inorganic precursors and using a simple process. This process was chosen for its simple requirements and the ability to modify the resulting spinel characteristics by adjusting different parameters easily like mixing temperature, time and speed and the drying conditions. The resulting samples were characterized using x-ray powder diffraction (XRPD), Fourier transform Infra-Red spectroscopy (FT-IR), Differential thermal analysis (DTA). The coloration, crystallinity size, formation and decomposition of the resulting ZnCo2O4 were found to depend on the calcination temperatures, Zn:Co molar ratio and stirring time. Results showed that ZnCo2O4 spinel was formed at relatively low temperatures. All the samples shared a cubic structure with Fd3m space group.
اصطناع الجمل الثنائية المكونة من ثنائي أكسيد الزركونيوم مع كل من ( أكسيد الكالسيوم- أكسيد المغنيزيوم ) بطريقة الترسيب المشترك ودراسة بنيتها وخواصها
Thick Films have been prepared by the chemical painting method from Tungsten Oxide nanopowdersas the source compound, which are prepared by milling in a high energy ball mill for variousspans of time (1-18h) on cleanedglasssubstratesunder limited the
rmal conditions. The temperature of the films have been changed from 25°C to 350°C. The films have been investigated for their sensing properties relating to 100 ppm ethanol vapor adsorption, using the (I–V) characteristics.The activation energy Ea for deposition films is deduced from the Arrhenius equation. The effect of the grain size and the thermal conditions on the sensing properties of the WO3thick films to ethanol vapor adsorption, as well as the correlations between The electrical conductivity of the WO3 thick films and the grain size of the material films are reported.The response time for films which have particle size about 70.54nm is defined at 300°C.
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
nd chemical adsorption methods. The
obtained results were compared to show the effect of
preparation process on the structural properties of the alumina.
Besides these results were compared with some oxides
supported on alumina, and the effect of distribution of these
oxides on the properties of alumina was investigated too.
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