Hydrophobic properties of TMOS/TMES-based silica aerogels

被引：97

作者：

Rao, AV ^{[1
]}

Kulkarni, MM ^{[1
]}

机构：

[1] Shivaji Univ, Dept Phys, Air Glass Lab, Kolhapur 416004, Maharashtra, India

来源：

MATERIALS RESEARCH BULLETIN | 2002年 / 37卷 / 09期

关键词：

oxides; surfaces; chemical synthesis; sol-gel chemistry; thermogravity analysis; surface properties;

D O I：

10.1016/S0025-5408(02)00795-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The hydrophobic properties of tetramethoxysilane (TMOS)-based silica aerogels by incorporating trimethylethoxysilane (TMES) as a synthesis component, are described. The molar ratio of TMES/TMOS (M) was varied from 0 to 4.0 by keeping the TMOS, methanol (MeOH), water (H2O) and ammonium hydroxide (NH4OH), molar ratio constant at 1:14:4:3.7 X 10(-3). The hydrophobic properties of the aerogels were studied using contact angle measurements, infrared spectroscopy and thermal analysis. The contact angle, theta increased from 100 to 140degrees for M = 0.5 to 4. While the volume shrinkage of the aerogels increased whereas the bulk density decreased with increased M values. The hydrophobic aerogels are thermally stable up to a temperature of 300degreesC and above this temperature the aerogels become hydrophilic. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1667 / 1677

页数：11

共 18 条

[1]

Bikerman JJ, 1958, SURFACE CHEM THEORY, P343

[2] Measurement of optical parameters of aerogel [J].

Buzykaev, AR ;

Danilyuk, AF ;

Ganzhur, SF ;

Kravchenko, EA ;

Onuchin, AP .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1999, 433 (1-2) :396-400

[3]

FRICKE J, 1992, STRUCT BOND, V77, P27

[4] Synthesis of polymeric precursors for the formation of nanocrystalline Ti-C-N/amorphous Si-C-N composites [J].

Hering, N ;

Schreiber, K ;

Riedel, R ;

Lichtenberger, O ;

Woltersdorf, J .

APPLIED ORGANOMETALLIC CHEMISTRY, 2001, 15 (10) :879-886

[5]

Hrubesh L. W., 1990, CHEM IND, V17

[6] Aerogel applications [J].

Hrubesh, LW .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1998, 225 (1-3) :335-342

[7] Solvent removal from water with hydrophobic aerogels [J].

Hrubesh, LW ;

Coronado, PR ;

Satcher, JH .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2001, 285 (1-3) :328-332

[8] Characterization of hydrophobic SiO2 powders prepared by surface modification on wet gel [J].

Jeong, AY ;

Goo, SM ;

Kim, DP .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 2000, 19 (1-3) :483-487

[9] Synthesis of low-density silica gel at ambient pressure: Effect of heat treatment [J].

Kang, SK ;

Choi, SY .

JOURNAL OF MATERIALS SCIENCE, 2000, 35 (19) :4971-4976

[10]

Mulder C. A. M., 1986, AEROGELS, P68

← 1 2 →