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Journal of Advanced Ceramics 2018, 7(4): 307-316 https://doi.org/10.1007/s40145-018-0280-6
Research Article | Open Access | Issue | Published: 18 December 2018

A study of morphological properties of SiO2 aerogels obtained at different temperatures

Show Author's Information Jin-jun LIAOa,  Peng-zhao GAOa( ),  Lin XUb,  Jian FENGb
College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of New Ceramic Fibers and Composites, National University of Defense Technology, Changsha 410082, China
Keywords:
temperature dependence, silica aerogel, nanoporous framework evolution, pore properties
Cite this article:
LIAO J-j, GAO P-z, XU L, et al. A study of morphological properties of SiO2 aerogels obtained at different temperatures. Journal of Advanced Ceramics, 2018, 7(4): 307-316. https://doi.org/10.1007/s40145-018-0280-6
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Abstract Full text About this article

In this paper, temperature dependence of nanoporous framework evolution process and variety of pore properties (pore volume, specific surface area (BET), and pore size) of SiO2 aerogels were characterized by FTIR, XPS, XRD, SEM, TEM, BET, BJH, etc. Results show that SiO2 aerogels treated at different temperatures all possess amorphous structure. With the increase of treated temperatures, BET values of SiO2 aerogels increase initially and then decrease, and it reaches the maximum value of 882.81 m2/g when treated at 600 ℃ for 2 h due to the addition of the nanopores and shrinkage skeleton of SiO2 aerogels. Higher temperatures may result in a framework transformation and particle growth; both factors could reduce the BET values of the aerogels. Nanoporous skeleton of SiO2 aerogels at room temperatures is composed of tetrahedron with a pore size of about 22.28 nm. Higher treated temperatures result in an increase of octahedron amount in nanoporous framework and a decrease of pore size. When treated at 1000 ℃, an approximate dense SiO2 bulk via the framework collapse and particle growth is obtained. These varieties are derived from the formed extra bonds of Si–O–Si, higher local stress, and liquid phase between particles during heat treatment process.


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About this article

A study of morphological properties of SiO2 aerogels obtained at different temperatures

Show Author's information Jin-jun LIAOa, Peng-zhao GAOa( ), Lin XUb, Jian FENGb
College of Materials Science and Engineering, Hunan University, Changsha 410082, China
Key Laboratory of New Ceramic Fibers and Composites, National University of Defense Technology, Changsha 410082, China

Abstract

In this paper, temperature dependence of nanoporous framework evolution process and variety of pore properties (pore volume, specific surface area (BET), and pore size) of SiO2 aerogels were characterized by FTIR, XPS, XRD, SEM, TEM, BET, BJH, etc. Results show that SiO2 aerogels treated at different temperatures all possess amorphous structure. With the increase of treated temperatures, BET values of SiO2 aerogels increase initially and then decrease, and it reaches the maximum value of 882.81 m2/g when treated at 600 ℃ for 2 h due to the addition of the nanopores and shrinkage skeleton of SiO2 aerogels. Higher temperatures may result in a framework transformation and particle growth; both factors could reduce the BET values of the aerogels. Nanoporous skeleton of SiO2 aerogels at room temperatures is composed of tetrahedron with a pore size of about 22.28 nm. Higher treated temperatures result in an increase of octahedron amount in nanoporous framework and a decrease of pore size. When treated at 1000 ℃, an approximate dense SiO2 bulk via the framework collapse and particle growth is obtained. These varieties are derived from the formed extra bonds of Si–O–Si, higher local stress, and liquid phase between particles during heat treatment process.

Keywords: temperature dependence, silica aerogel, nanoporous framework evolution, pore properties

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Publication history

Received: 03 March 2018
Revised: 02 May 2018
Accepted: 02 May 2018
Published: 18 December 2018
Issue date: December 2018

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© The author(s) 2018

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