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Constant-current electroosmotic dewatering of superabsorbent hydrogel

Tanaka, Takanori and Fujihara, Kenji and Jami, Mohammed Saedi and Iwata, Masashi (2014) Constant-current electroosmotic dewatering of superabsorbent hydrogel. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 440. pp. 116-121. ISSN 0927-7757

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Abstract

The electroosmotic dewatering (EOD) behaviors of gelatinous materials, such as superabsorbent hydrogels or swelling clay, are discussed. The apparent liquid velocity through the materials can be represented in terms of effective-osmotic, electroosmotic and swelling pressure gradients. Taking the creep deformation of the materials into consideration and assuming that the mechanical properties of the materials can be represented by the Terzaghi–Voigt combined model, the basic differential equation expressing EOD of gelatinous materials is solved. The progress of EOD is represented by an average consolidation ratio Uc as in mechanical expression. The agreement between calculated and experimental Uc is satisfactory when the creep deformation of the material is considered. The disagreement between theory and experiment in the latter part of EOD may be due to the change of the property of hydrogel caused by dissolution of Fe(III) from stainless steel electrode.

Item Type: Article (Journal)
Additional Information: 5545/28893
Uncontrolled Keywords: Electroosmotic dewatering; Effective osmotic pressure gradient; Swelling pressure gradient; Superabsorbent gel
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Professor Dr. Mohammed Saedi Jami, PhD CEng MIChemE
Date Deposited: 19 Mar 2013 09:46
Last Modified: 19 Sep 2017 15:38
URI: http://irep.iium.edu.my/id/eprint/28893

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