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Research Article Open Access

Carbon microfibers/silica aerogel nanocomposites based on water-glass

Agnieszka ƚlosarczyk1*, Paulina Jakubowska2

 

 

1Faculty of Civil and Environmental Engineering, Institute of Structural Engineering, Poznan University of Technology, Street Piotrowo 5, Poznan, 60-965, Poland.

2Faculty of Chemical Technology, Institute of Technology and Chemical Engineering, Poznan University of Technology, Street Piotrowo 3, Poznan, 60-965, Poland

Adv. Mater. Proc., 2018, 3 (1), 45-49

DOI: 10.5185/amp.2018/6741

Publication Date (Web):01 January 2018

Copyright © IAAM-VBRI Press

Abstract


Abstract

In presented article the research on sol-gel synthesis of silica aerogel from cheaper precursor water glass with ambient pressure drying was shown. In addition to strengthen the silica aerogel frame the as-received and oxidized carbon microfibers from coal-tar pitch were used. The presence of carbon microfibers in silica aerogel does not influence the structural parameters, on the contrary, the carbon microfibers diminish the density and contraction during drying of silica aerogel nanocomposite. Modification of the silica aerogels in a mixture of TMCS/n-hexane in 70°C with concurrent modification of carbon microfibers results in obtaining a durable nanocomposite, up to the temperature of 600°C, characterized by high level of hydrophobicity, which is proved by tests on contact angle. Moreover, the analysis with EDS probe proved, in case of the nanocomposites with carbon microfiber, a lack of sodium, being a remnant of the silica gel synthesis from water glass, which implies a higher level of substrate reaction during the sol-gel synthesis, and results in obtaining better parameters of the silica aerogel. Copyright © 2018 VBRI Press.

Keywords


Silica aerogel, nanocomposites, carbon microfibers, chemical modification.