Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/813
Title: Synthesis of sustainable silica xerogels/aerogels using inexpensive steel slag and bean pod ash: A comparison study
Authors: Kaya Güzel, Gülcihan
Yılmaz, Elif
Deveci, Hüseyin
Keywords: Sol-Gel Method
Sustainable Precursors
Sio2 Xerogel/Aerogel Powder
Mesoporous Structure
Thermal Insulation
Thermal-Conductivity
Drying Conditions
Fly-Ash
Aerogels
Xerogels
Waste
Pore
Bed
Publisher: ELSEVIER
Abstract: Low cost silica xerogels/aerogels were synthesized from steel slag and bean pod ash by sol-gel method. Comparison study showed differences between structural, morphological, textural, thermal and physical properties of the silica xerogels and aerogels. Formation of amorphous structure and silica network was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy analyses, respectively. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses revealed that silica xerogels had smaller interlinked network in contrast to silica aerogels. Typical type IV isotherm was observed for all samples in N-2 adsorption-desorption isotherms. The highest surface area was determined as 371 m(2) g (1) for silica aerogel synthesized from steel slag. Particle size of silica aerogels was lower than that of the silica xerogels. The more porous structure made silica aerogels desirable materials with lower bulk density and thermal conductivity when compared to silica xerogels. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) exhibited high thermal stability of the silica xerogels/aerogels. Although silica xerogels had highly hydrophilic structure, contact angle of silica aerogels synthesized from steel slag and bean pod ash was 60 degrees and 74 degrees, respectively. The comparison study will give a new point of view about differences between silica xerogels and aerogels synthesized from by-products or inorganic/organic waste instead of silicon alkoxides. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
URI: https://doi.org/10.1016/j.apt.2019.12.013
https://hdl.handle.net/20.500.13091/813
ISSN: 0921-8831
1568-5527
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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