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

• Published in: Particuology Vol. 9; no. 3; pp. 228 - 234
• Main Authors: Chan, Eng-Seng, Lim, Tek-Kaun, Voo, Wan-Ping, Pogaku, Ravindra, Tey, Beng Ti, Zhang, Zhibing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2011; School of Engineering, Monash University, Jalan Lagoon Selatan, 46150 Bandar Sunway, Selangor, Malaysia%Centre of Materials and Minerals, School of Engineering and Information Technology, Universiti Malaysia Sabah, 88999 Kota Kinabalu, Sabah, Malaysia%Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia%School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
• Subjects: Alginate; Alginates; Beads; Compressed; Compression; Deformation; Displacement; Elastic limit; Formulations; Gelation; Hertz theory; Modulus of elasticity; Stiffness; Young's modulus; 刚度; 力学性能; 化学亲和力; 压缩速度; 杨氏模量; 海藻酸钠; 离子浓度; 褐藻胶; Young's modulus; Compression; Alginate; Deformation; Hertz theory; Elastic limit
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2010.12.002

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 extrusiondripping 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.