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http://dx.doi.org/10.5762/KAIS.2019.20.11.537

Particle Size Control by the Addition of PVA and HNO3 in γ-Al2O3 Synthesis Using by Sol-Gel Method  

Um, Myeong-Heon (Division of Chemical Engineering, Kongju National University)
Kim, Na-Eun (Department II, Korea Gas Safety Corporation)
Ha, Beom-Yong (Department of Renewable & Electrical Engineering, Yeungjin University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.11, 2019 , pp. 537-543 More about this Journal
Abstract
Alumina(Al2O3) is a ceramic material used in industry with a range of particle sizes and characteristics. In this study, a boehmite sol was prepared by a hydrolysis and peptizing process using the Sol-Gel method from aluminum isopropoxide (AIP). γ-Al2O3 was prepared by drying and calcining. To prevent particle agglomeration during the manufacturing process, four kinds of polyvinyl alcohol (PVA) with molecular weights of 9,000~10,000, 31,000~50,000, 89,000~98,000, and 130,000 were added and three concentrations of HNO3 (0.1, 0.3, 0.5 molar ratio) were added to determine their effects on the particles. The crystal structure, composition, particle size and shape of the prepared γ-Al2O3 were confirmed through x-ray diffraction (XRD), x-ray fluorescence analyzer (XRF), particle size analyzer (PSA), and field emission scanning electron microscopy (FE-SEM). As a result, γ-Al2O3 with a purity of approximately 98.2% was synthesized, and the particle size decreased and the uniformity increased with increasing ratio of HNO3 addition and PVA molecular weight. From these results, the particle size can be controlled during the manufacturing process of γ-Al2O3 by controlling the addition ratio of PVA and HNO3.
Keywords
Sol; Gel; PVA; ${\gamma}-Al_2O_3$; Particle Size;
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