Effects of ultrasound in coating nano-precipitated CaCO3 with stearic acid

Kow, Kien Woh and Abdullah, Ezzat Chan and Abdul Raman, Abdul Aziz (2009) Effects of ultrasound in coating nano-precipitated CaCO3 with stearic acid. Asia-Pacific Journal of Chemical Engineering, 4 (5). pp. 807-813. ISSN 1932-2135, DOI https://doi.org/10.1002/apj.342.

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Official URL: https://doi.org/10.1002/apj.342

Abstract

Nano-Precipitated CaCO3 (NPCC) are coated with stearic acid to improve its dispersion in polymer as well as to reduce agglomeration. In this work, coating was done by wet method using ethanol. Ultrasonication was applied to NPCC to de-agglomerate micron size NPCC into smaller size. Effects of amplitude, temperature and energy input of ultrasonication was investigated. The amplitude was varied from 60 to 100 whereas temperature was varied from 5 degrees C to 45 degrees C. The energy input was stressed up from 3.6 kJ to 180 kJ. Mean diameter of NPCC were observed by using Particle Size Analyzer and Transmission Electron Microscopy (TEM). It was found that mean diameter of NPCC do not vary significantly with temperature. Mean diameter of NPCC, however, decreases exponentially with the energy input. Comparisons were done on NPCC coated with others methods such as dry ball milling and aqueous coating TEM images show that coating NPCC with ultrasonication is more uniform than other methods. In addition, first derivative mass loss with temperature (DTG) reveals that NPCC coated with Ultrasonication do not contain excessive free acid as exhibited by those coated in aqueous and dry ball milling. (c) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.

Item Type: Article
Funders: UNSPECIFIED
Uncontrolled Keywords: coating NPCC; stearic acid; agglomeration; ultrasonication
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr. Mohammed Salim Abd Rahman
Date Deposited: 15 Jan 2013 02:48
Last Modified: 10 Feb 2021 02:35
URI: http://eprints.um.edu.my/id/eprint/4503

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