Control of porous structure in flexible silicone aerogels produced from methyltrimethoxysilane (MTMS): the effect of precursor concentration in sol-gel solutions

被引：18

作者：

Du, M. ^{[1
]}

Mao, N. ^{[1
]}

Russell, S. J. ^{[1
]}

机构：

[1] Univ Leeds, Sch Design, Performance Text & Clothing Res Grp, Leeds LS2 9JT, W Yorkshire, England

来源：

JOURNAL OF MATERIALS SCIENCE | 2016年 / 51卷 / 02期

关键词：

SURFACE-AREA; PORE VOLUME; POROSITY;

D O I：

10.1007/s10853-015-9378-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Controllable nanoporous structure in MTMS-based silicone aerogels is required to improve their thermal conductivity. Silicone aerogels were formed in a two-step acid-base catalysed sol-gel process combined with supercritical drying. The influence of MTMS concentration, specifically the molar ratio of methanol:MTMS and water:MTMS in the sol-gel process was studied in relation to the porous structure of resultant silicone aerogels. Samples were characterised to determine the dimensions of micro, meso and macro-pore structure by means of both nitrogen gas adsorption-desorption for detection of pores < 300 nm and by analysis of FEG-SEM images for pores > 300 nm. Porosity, pore volume distribution and Brunau er-Emmitt-Teller surface area in the silicone aerogels were all found to be influenced by adjustment of the molar ratio of methanol:MTMS and the molar ratio of water:MTMS during sol-gel processing.

引用

页码：719 / 731

页数：13

共 29 条

[1] Surface characterization by nitrogen adsorption of silica aerogels synthesized from various Si(OR)4 and R"Si(OR′)3 precursors [J].

Al-Oweini, Rami ;

El-Rassy, Houssam .

APPLIED SURFACE SCIENCE, 2010, 257 (01) :276-281

[2] Impact of depressurizing rate on the porosity of aerogels [J].

Amaral-Labat, G. ;

Szczurek, A. ;

Fierro, V. ;

Masson, E. ;

Pizzi, A. ;

Celzard, A. .

MICROPOROUS AND MESOPOROUS MATERIALS, 2012, 152 :240-245

[3] THE DETERMINATION OF PORE VOLUME AND AREA DISTRIBUTIONS IN POROUS SUBSTANCES .1. COMPUTATIONS FROM NITROGEN ISOTHERMS [J].

BARRETT, EP ;

JOYNER, LG ;

HALENDA, PP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1951, 73 (01) :373-380

[4] Surface chemical modification of TEOS based silica aerogels synthesized by two step (acid-base) sol-gel process [J].

Bhagat, Sharad D. ;

Rao, A. Venkateswara .

APPLIED SURFACE SCIENCE, 2006, 252 (12) :4289-4297

[5] PREPARATION OF MONODISPERSE SILICA PARTICLES - CONTROL OF SIZE AND MASS FRACTION [J].

BOGUSH, GH ;

TRACY, MA ;

ZUKOSKI, CF .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1988, 104 (01) :95-106

[6]

Brinker CJ, 1999, AMBIENT PRESSURE PRO, P12

[7] MAP OF GEL TIMES FOR 3 PHASE REGION TETRAETHOXYSILANE, ETHANOL AND WATER [J].

CHANG, SY ;

RING, TA .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 1992, 147 :56-61

[8] Silica aerogel; synthesis, properties and characterization [J].

Dorcheh, A. Soleimani ;

Abbasi, M. H. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 199 (1-3) :10-26

[9] Strengthening of silica gels and aerogels by washing and aging processes [J].

Einarsrud, MA ;

Nilsen, E ;

Rigacci, A ;

Pajonk, GM ;

Buathier, S ;

Valette, D ;

Durant, M ;

Chevalier, B ;

Nitz, P ;

Ehrburger-Dolle, F .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2001, 285 (1-3) :1-7

[10] Knudsen diffusion in silicon nanochannels [J].

Gruener, Simon ;

Huber, Patrick .

PHYSICAL REVIEW LETTERS, 2008, 100 (06)

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