Effect of formulation of alginate beads on their mechanical behavior and stiffness

Chan, Eng Seng and Lim, Tek Kaun and Voo, Wan Ping and Pogaku, Ravindra and Tey, Beng Ti and Zhang, Zhibing (2011) Effect of formulation of alginate beads on their mechanical behavior and stiffness. Particuology, 9 (3). pp. 228-234. ISSN 1674-2001

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Abstract

The aim of this work was to determine the effect of formulation of alginate beads on their mechanical behavior and stiffness when compressed at high speed. The alginate beads were formulated using different types and concentrations of alginate and gelling cations and were produced using an extrusion-dripping method. Single wet beads were compressed at a speed of 40 mm/min, and their elastic limits were investigated, and the corresponding force versus displacement data were obtained. The Young's moduli of the beads were determined from the force versus displacement data using the Hertz's contact mechanics theory. The alginate beads were found to exhibit plastic behavior when they were compressed beyond 50% with the exception of copper alginate beads for which yield occured at lower deformation. Alginate beads made of higher guluronic acid contents and gelling cations of higher chemical affinity were found to have greater stiffness. Increasing the concentration of alginate and gelling ions also generated a similar effect. At such a compression speed, the values of Young's modulus of the beads were found to be in the range between 250 and 900 kPa depending on the bead formulation. (C) 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.

Item Type: Article
Uncontrolled Keywords: Alginate, Young's modulus, Elastic limit, Deformation, Compression, Hertz theory
Subjects: ?? TP155-156 ??
Divisions: SCHOOL > School of Engineering and Information Technology
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 11 Aug 2011 02:09
Last Modified: 19 Oct 2017 06:35
URI: http://eprints.ums.edu.my/id/eprint/1483

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