| Study of SiO2 coating and carboxylic surface-modification on Mg-based inorganic fiber by one-step reflux reaction |
Minsol Park1,2, Areum Choi1, Seiki Kim1, Wooyoung Shim2, YooJin Kim1
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1Engineering Materials Center, Korea Institute of Ceramic Engineering & Technology, Icheon, Korea
2Department of Materials Science & Engineering, Yonsei University, Seoul, Korea |
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Received: February 20, 2022; Revised: June 16, 2022 Accepted: June 28, 2022. Published online: August 3, 2022. |
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| ABSTRACT |
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Magnesium hydroxide sulfate hydrate (5 Mg(OH)2·MgSO4·3H2O abbreviated 513MHSH) whiskers using for fiber reinforcements and fillers are synthesized via a reflux reaction by using MgO and H2SO4 as reactants. In general, the 513MHSH whiskers have hydrophilic surface and heat resistant property with crystal water molecules. In this work, surface modification and SiO2 coating technique were employed for various application by coating with organic and silica layer on 513MHSH whisker surface. Also, SiO2 coating system is important for preventing aggregation and enhancing thermal stability [J Kor Ceram Soc 55:618, 2018; J Nanosci Nanotechnol 10:380, 2010]. Controlling pH value acts as important factor for establish one-step process that synthesis and surface modification/SiO2 coating process simultaneously to improve the efficiency in terms of the time and process. The morphology and phase of synthesized 513MHSH whiskers are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Surface modified whiskers were characterized by Fourier transform infrared spectroscopy (FTIR) and the thermal stability of SiO2 coated whiskers were evaluated by thermogravimetric analysis (TGA). |
| Key words:
Magnesium hydroxide sulfate hydrate · One-step process · Surface modifi cation · SiO2 coating |
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