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Synthesis of sodium silicate-based silica aerogels with graphene oxide by ambient pressure drying

Lookup NU author(s): Dr Khalil Hassan, Dr Jiabin Wang, Dr Xiao Han, Professor Lidija Siller

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2021, The Author(s).Here we study how graphene oxide affects silica aerogels and their physical and mechanical properties by examining volume shrinkage, pore volume, surface area and compressive strength of these composite aerogels. Composite aerogels were made through adding different amount of graphene oxide (GO) to sodium silicate precursor by using ambient pressure drying method. Additionally, the chemical composition of the composite aerogels was determined using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. A rougher structure was observed when the GO loading increased and the characteristic peak of GO in XRD disappeared due to the random distribution of GO within the silica matrix. FTIR spectrum of composite aerogels shows that the relative intensity of silanol groups on the silica matrix have downward tendency with the addition of GO. The specific surface area had maxima with the addition of 0.01 wt% GO surface area to 578 m2 /g. The mechanical strength of aerogels was increased, with the loading of GO from 0.0 wt% to 0.2 wt%, and the compressive modulus increased from 0.02 MPa to 0.22 MPa.


Publication metadata

Author(s): Cakmak OK, Hassan KT, Wang J, Han X, Siller L

Publication type: Article

Publication status: Published

Journal: Journal of Porous Materials

Year: 2021

Pages: epub ahead of print

Online publication date: 12/06/2021

Acceptance date: 04/06/2021

Date deposited: 26/08/2021

ISSN (print): 1380-2224

ISSN (electronic): 1573-4854

Publisher: Springer

URL: https://doi.org/10.1007/s10934-021-01103-2

DOI: 10.1007/s10934-021-01103-2


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