2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 18 Intl. Symp on Advanced Materials, Polymers, Composite, Nanomaterials, Nanotechnologies and Manufacturing
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, M. De Campos, S. Lewis, S. Miller, S. Thomas. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 290 pages |
| ISBN: | 978-1-989820-68-1(CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Electrically Responsive Materials Based on Agarose Hydrogel for Actuator Application
Kornkanok Rotjanasuworapong1; Phimchanok Sakunpongpitiporn1; Katesara Phasuksom1; Natlita Thummarungsan1; Anuvat Sirivat1;1CHULALONGKORN UNIVERSITY, Bangkok, Thailand;
Type of Paper: Regular
Id Paper: 172
Topic: 62
Abstract:
Among the widely used soft materials, hydrogels have been investigated because of their biocompatibility, water absorption, softness, and flexibility to convert the external stimuli into the mechanical actuation by changing volume through shrinking, swelling or bending [1]. Agarose (AG), a non-ionic linear polysaccharide extracted from red seaweeds, is one of two main components of agar in addition to agaropectin. It has been widely used to study the thermo-reversible gelation. Generally, the gelation mechanism of agarose hydrogel occurs via the hydrogen bonding of helical structure, called physically cross-linked hydrogel [2].
In the present work, the agarose hydrogels (AG HyGels) were fabricated by a solvent casting method. The electromechanical properties, namely the storage modulus (G') and the storage modulus relative response (ΔG'/G'0) under various agarose contents, electric field strengths, and operation temperature were investigated by a rheometer. The electro-induced bending responses, namely the deflection angle and the dielectrophoresis force (Fd) were examined under various agarose contents and electric field strengths by immersing the sample in a silicone oil chamber between two parallel copper electrodes.
In the electromechanical properties under applied electric field strength of 800 V/mm, the highest storage modulus (G') and storage modulus relative response (ΔG'/G'0) of 4.48 x 106 Pa and 1.07 were obtained from the AG HyGel_12.0%v/v due to the electrostriction effect [3]. With increasing operating temperature, the intermolecular hydrogen bonding interaction between the agarose chains were disturbed, leading to the decrease in the G' [4]. For the electro-induced bending response, the free ends of the AG HyGels bended toward the positively charged electrode depending on the electric field strength, implying the attractive interaction between the polarizations of the AG HyGel and the electrode [5]. The highest deflection angle of 74° was obtained from the AG HyGel_2.0%v/v due to its initial lower rigidity.
Comparing the performances with other bio-based hydrogels, the AG HyGels are possible candidates to use as electro-responsive hydrogels for soft actuator applications.
Keywords:
Biodegradable; Properties;References:
[1] M. Boruah, P. Phukon, B.J. Saikia, S.K. Dolui, Polymer Composites, 35(1) (2014) 27-36.[2] K.J. Le Goff, C. Gaillard, W. Helbert, C. Garnier, T. Aubry, Carbohydrate Polymers 116 (2015) 117-123.
[3] W. Sangwan, K. Petcharoen, N. Paradee, W. Lerdwijitjarud, A. Sirivat, Carbohydrate Polymers 151 (2016) 213-222.
[4] N. Tanusorn, N. Thummarungsan, W. Sangwan, W. Lerdwijitjarud, A. Sirivat, International Journal of Biological Macromolecules 118 (2018) 2098-2107.
[5] H. Jiang, L. Fan, S. Yan, F. Li, H. Li, J. Tang, Nanoscale 11 (2019) 2231-2237.