Low thermal-conductivity and high thermal stable silica aerogel based on MTMS/Water-glass co-precursor prepared by freeze drying

被引：107

作者：

Pan, Yuelei ^{[1
]}

He, Song ^{[1
]}

Gong, Lunlun ^{[1
]}

Cheng, Xudong ^{[1
]}

Li, Congcong ^{[1
]}

Li, Zhi ^{[1
]}

Liu, Zhong ^{[2
]}

Zhang, Heping ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230027, Anhui, Peoples R China

[2] ECONANO Beijing Tech Ltd, Beijing 100176, Peoples R China

来源：

MATERIALS & DESIGN | 2017年 / 113卷

关键词：

Silica aerogels; MTMS/Water-glass; Freeze drying; Hydrophobic; Thermal stability; SURFACE CHEMICAL-MODIFICATION; PHYSICAL-PROPERTIES; LOW-DENSITY; XEROGELS;

D O I：

10.1016/j.matdes.2016.09.083

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, hybrid silica aerogels were prepared by methltrimethoxysilane (MTMS) and water-glass co-precursor through two-step sol-gel process followed by freeze drying (FD). The characteristics of aerogels were strongly affected by the molar ratio of MTMS/Water-glass. When the molar ratio is 5.1, hybrid aerogel was obtained with good performances, such as low density (0.083 g/cm(3)), high contact angle (155.1 degrees) and low thermal conductivity (0.0226 W/m.K). The density, contact angle and thermal conductivity of aerogels based on co-precursor are still showing excellent thermal stability with the same performances after 550 degrees C heat-treatment. (C) 2016 Published by Elsevier Ltd.

引用

页码：246 / 253

页数：8

共 27 条

[1] Aerogel insulation for building applications: A state-of-the-art review [J].

Baetens, Ruben ;

Jelle, Bjorn Petter ;

Gustavsen, Arild .

ENERGY AND BUILDINGS, 2011, 43 (04) :761-769

[2] The development of a monolithic aerogel glazed window for an energy retrofitting project [J].

Berardi, Umberto .

APPLIED ENERGY, 2015, 154 :603-615

[3] 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

[4] Elastic silica aerogel using methyltrimethoxysilane precusor via ambient pressure drying [J].

Cai, Long ;

Shan, Guorong .

JOURNAL OF POROUS MATERIALS, 2015, 22 (06) :1455-1463

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

Dorcheh, A. Soleimani ;

Abbasi, M. H. .

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

[6] Versatile Aerogel Fabrication by Freezing and Subsequent Freeze-Drying of Colloidal Nanoparticle Solutions [J].

Freytag, Axel ;

Sanchez-Paradinas, Sara ;

Naskar, Suraj ;

Wendt, Natalja ;

Colombo, Massimo ;

Pugliese, Giammarino ;

Poppe, Jan ;

Demirci, Cansunur ;

Kretschmer, Imme ;

Bahnemann, Detlef W. ;

Behrens, Peter ;

Bigall, Nadja C. .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2016, 55 (03) :1200-1203

[7] SiO2 aerogels prepared by ambient pressure drying with ternary azeotropes as components of pore fluid [J].

Guo, Yaqin ;

Wang, Hui ;

Zeng, Lingke .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2015, 428 :1-5

[8] Ambient pressure dried TEOS-based silica aerogels: good absorbents of organic liquids [J].

Gurav, Jyoti L. ;

Rao, A. Venkateswara ;

Nadargi, D. Y. ;

Park, Hyung-Ho .

JOURNAL OF MATERIALS SCIENCE, 2010, 45 (02) :503-510

[9] Hydrophobic and low density silica aerogels dried at ambient pressure using TEOS precursor [J].

Gurav, Jyoti L. ;

Rao, A. Venkateswara ;

Bangi, Uzma K. H. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 471 (1-2) :296-302

[10] The thermal conductivity of polymethylsilsesquioxane aerogels and xerogels with varied pore sizes for practical application as thermal superinsulators [J].

Hayase, G. ;

Kugimiya, K. ;

Ogawa, M. ;

Kodera, Y. ;

Kanamori, K. ;

Nakanishi, K. .

JOURNAL OF MATERIALS CHEMISTRY A, 2014, 2 (18) :6525-6531

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