Surfactant and Metal Ion Effects on the Mechanical Properties of Alginate Hydrogels
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Date
2016
Authors
Pekcan, Mehmet Önder
Evingür, Gülşen Akin
Pekcan, Önder
von Klitzing, Regine
Erim, F. Bedia
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Science Bv
Open Access Color
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Abstract
This paper addresses the controlled variation of the mechanical properties of alginate gel beads by changing the alginate concentration or by adding different surfactants or cross-linking cations. Alginate beads containing nonionic Brij 35 or anionic sodium dodecyl sulfate (SDS) surfactants were prepared with two different types of cations (Ca2+ Ba2+) as crosslinkers. Compression measurements were performed to investigate the effect of the surfactant and cation types and their concentrations on the Young's modulus of alginate beads. The Young's modulus was determined by using Hertz theory. For all types of alginate gel beads the Young's modulus showed an increasing value for increasing alginate contents. Addition of the anionic surfactant SDS increases the Young's modulus of the alginate beads while the addition of non-ionic surfactant Brij 35 leads to a decrease in Young's modulus. This opposite behavior is related to the contrary effect of both surfactants on the charge of the alginate beads. When Ba2+ ions were used as crosslinker cation the Young's modulus of the beads with the surfactant SDS was found to be approximately two times higher than the modulus of beads with the surfactant Brij 35. An ion specific effect was found for the crosslinking ability of divalent cations. (C) 2016 Elsevier B.V. All rights reserved.
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Keywords
Alginate, Surfactant, Mechanical properties
Turkish CoHE Thesis Center URL
Fields of Science
Citation
44
WoS Q
Q1
Scopus Q
Q1
Source
Volume
92
Issue
Start Page
220
End Page
224