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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.119  No.1387 (March) (2011)  >  pp.161-167

Journal of the Ceramic Society of Japan
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Consolidation behavior of nanometer-sized SiC particles with phenylalanine through pressure filtration at 1 MPa

Naoki MATSUNAGA1), Aya YAMASHITA1) and Yoshihiro HIRATA1)
1) Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University

  The consolidation behavior of two kinds of colloidal SiC particles (30 and 330 nm diameters) with and without phenylalanine dispersant (C6H5CH2CHNH3+COO) at pH 7 was examined using a developed pressure filtration apparatus at 1 MPa of applied pressure. The height of 5 vol %-30 nm SiC suspension with and without phenylalanine as a function of filtration time was well simulated by a filtration model developed for a flocculated suspension rather than a traditional filtration model for a dispersed suspension. The result with phenylalanine is related to the colloidal phase transition from well dispersed particles to flocculated particles under an applied pressure of 1 MPa. The consolidation time became longer as the amount of phenylalanine added exceeded 0.1 mg/m2-SiC. However, the packing density of 30 nm SiC particles after consolidation increased from 35% for no addition of phenylalanine to 37–42% for 0.1–1 mg phenylalanine/m2-SiC. The consolidation behavior of 20 vol %-330 nm SiC suspension with and without phenylalanine was also well expressed by the filtration model for a flocculated suspension. A longer consolidation time was also measured for the addition of phenylalanine above 1 mg/m2-SiC. However, the packing density (49%) of 330 nm SiC particles increased scarcely to 52% by the addition of phenylalanine (2.68 × 10−2–2.85 mg/m2-SiC).

Pressure filtration, Theoretical filtration model, Silicon carbide, Phenylalanine

Received: October 14, 2010
Accepted: December 16, 2010 , Published online: March 01, 2011
Copyright (c) 2011 The Ceramic Society of Japan



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