Vacuum-Dried Synthesis of Low-Density Hydrophobic Monolithic Bridged Silsesquioxane Aerogels for Oil/Water Separation: Effects of Acid Catalyst and Its Excellent Flexibility

被引：42

作者：

Chen, Dangjia ^{[1
]}

Gao, Hongyi ^{[1
]}

Jin, Zhaokui ^{[2
]}

Wang, Junyong ^{[1
]}

Dong, Wenjun ^{[1
]}

Huang, Xiubing ^{[1
]}

Wang, Ge ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing Key Lab Funct Mat Mol & Struct Construct, Beijing 100083, Peoples R China

[2] Shenzhen Univ, Natl Reg Key Technol Engn Lab Med Ultrasound, Guangdong Key Lab Biomed Measurements & Ultrasoun, Sch Biomed Engn,Hlth Sci Ctr, Shenzhen 518060, Guangdong, Peoples R China

来源：

ACS APPLIED NANO MATERIALS | 2018年 / 1卷 / 02期

关键词：

aerogel; bridged silsesquioxane; flexibility; vacuum drying; oil/water separation; SILICA AEROGELS; TRANSPARENT; XEROGELS;

D O I：

10.1021/acsanm.7b00328

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Low-density hydrophobic monolithic bridged silsesquioxane aerogels were prepared by vacuum drying using terephthalaldehyde (TPAL) and 3-aminopropyl-triethoxysilane (APTES) as precursors and acetic acid as catalyst. The effects of acid on the vacuum-dried synthesis of bridged silsesquioxane aerogels were investigated. The results indicate that the growth mechanism changes from cluster-cluster to monomer-cluster when acid is added, which induces the formation of the low-density monolithic aerogels with increased pore size. The methyltrimethoxysilane (MTMS) co-precursor could endow the aerogels with good hydrophobicity. The densities, pore structure, hydrophobicity, and mechanical properties of the obtained bridged silsesquioxane aerogels were investigated in detail. The results show that the monolithic aerogels possess low density (0.071 g/cm(3)), high hydrophobicity (contact angle, >140 degrees), and excellent flexibility (Young's modulus, 0.029 MPa). All of these characteristics make the hydrophobic aerogels competitive candidates for oil/water separation.

引用

页码：933 / 939

页数：13

共 36 条

[1]

Aegerter M. A., 2011, AEROGELS HDB, P251

[2] SOL-GEL TRANSITION IN SIMPLE SILICATES [J].