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Size-dependence hydrophobicity in nanocrystalline talc produced by high-intensity planetary ball milling

Published online by Cambridge University Press:  23 July 2015

Rebeca Caban-Nevarez  and
Oscar J Perales Perez
Rebeca Caban-Nevarez
Affiliation:
Food Science and Technology Program, University of Puerto Rico at Mayaguez, Mayaguez, PR 00680, United States
Oscar J Perales Perez
Affiliation:
Food Science and Technology Program, University of Puerto Rico at Mayaguez, Mayaguez, PR 00680, United States Department of Engineering Science and Materials, University of Puerto Rico at Mayaguez, Mayaguez, PR 00680, United States
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Abstract

Micron-size talc samples were ground using a high-intensity planetary ball mill at different milling times as an attempt to reduce particle size and study the effect on the corresponding hydrophobicity. XRD and SEM results confirmed the decrease in the particle size. FTIR spectroscopy analyses revealed the talc characteristic bands centered on 669 cm-1 for the O-H bonds and 1018 cm-1 for the Si-O bonds, as well as a degradation in the talc structure for prolonged milling times. BET results indicate an increase of specific surface area, which also confirms particle size reduction, reaching a maximum at 1 h, after which the particles agglomerate. Contact angle measurements show a decrease in the hydrophobicity of talc after milling. Although talc retains its hydrophobicity after short milling periods, prolonged grinding causes the mineral to have a more hydrophilic character.

Keywords

crystallinenanostructurepowder processing
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1805: Symposium SS/TT – Fabrication and Properties of Oxide Thin Films, Nanostructures and Interfaces for Advanced Applications , 2015 , mrss15-2138017
Copyright
Copyright © Materials Research Society 2015 

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