The effect of adding PDMS-OH and silica nanoparticles on sol-gel properties and effectiveness in stone protection

被引:49
作者
Li, Dan [1 ]
Xu, Feigao [2 ]
Liu, Zhenghua [1 ]
Zhu, Jiaqi [1 ]
Zhang, Qingjian [3 ]
Shao, Li [1 ]
机构
[1] Nanchang Univ, Sch Environm & Chem Engn, Nanchang 330031, Peoples R China
[2] Nanchang Univ, Coll Sci, Nanchang 330031, Peoples R China
[3] Shandong Entry Exit Inspect & Quarantine Bur, Qingdao 266001, Peoples R China
关键词
Crack-free; PDMS-OH; Silica nanoparticles; NANOMATERIALS; CONSOLIDANTS; PARTICLES; TEOS;
D O I
10.1016/j.apsusc.2012.12.030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:368 / 374
页数:7
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