Study of SiO2 coating and carboxylic surface-modification on Mg-based inorganic fiber by one-step reflux reaction

• Published in: Hanʼguk Seramik Hakhoe chi Vol. 59; no. 6; pp. 869 - 875
• Main Authors: Park, Minsol, Choi, Areum, Kim, Seiki, Shim, Wooyoung, Kim, YooJin
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.11.2022
• Subjects: Ceramics; Chemistry and Materials Science; Composites; Glass; Materials Science; Natural Materials; Original Article; SiO; Surface modification; coating; Magnesium hydroxide sulfate hydrate; One-step process
• ISSN: 1229-7801; 2234-0491
• DOI: 10.1007/s43207-022-00227-8

Magnesium hydroxide sulfate hydrate (5 Mg(OH) 2 ·MgSO 4 ·3H 2 O abbreviated 513MHSH) whiskers using for fiber reinforcements and fillers are synthesized via a reflux reaction by using MgO and H 2 SO 4 as reactants. In general, the 513MHSH whiskers have hydrophilic surface and heat resistant property with crystal water molecules. In this work, surface modification and SiO 2 coating technique were employed for various application by coating with organic and silica layer on 513MHSH whisker surface. Also, SiO 2 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/SiO 2 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 SiO 2 coated whiskers were evaluated by thermogravimetric analysis (TGA).