کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5363871 1503697 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of adding PDMS-OH and silica nanoparticles on sol-gel properties and effectiveness in stone protection
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
The effect of adding PDMS-OH and silica nanoparticles on sol-gel properties and effectiveness in stone protection
چکیده انگلیسی

Inorganic-organic hybrid crack-free xerogels were obtained using di-n-butyltin dilaurate (DBTL) as a catalyst containing tetraethoxyorthosilicate (TEOS) and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) as an additive. We studied the effect of gelling time and sol pH on DBTL concentration. The xerogels' structure was studied by FTIR, TGA-DTA and SEM techniques. The results showed that the catalyst (DBTL) would substantially shorten the gelling time of the sol. With the addition of PDMS-OH, the viscosity of the sol increased while the gel time decreased. In addition, we noticed an improvement in the cracking of the xerogel with the addition of PDMS-OH. However, the xerogels were opaque when mole ratio of PDMS/TEOS is higher than 0.153. Addition of silica nanoparticles at 0.1% (w/v) in sol could increase xerogels' surface roughness and hydrophobicity and did not change color of the xerogels. The protective performance evaluated by its ability to resist acid rain revealed that the protective effects were satisfying.

► Preparation of TEOS-SiO2-PDMS-OH hybrid gels using DBTL as a catalyst. ► Thermal properties of TEOS-PDMS hybrid gels were characterized. ► Acid rain resistance property of hybrid agents for carbonate stone was evaluated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 266, 1 February 2013, Pages 368-374
نویسندگان
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