title: Electro-response characteristic of starch hydrogel crosslinked with Glutaraldehyde.
abstract: The facile synthesis of the starch hydrogel with anisotropic microstructure and dynamic behaviors was developed in the presence (A-gel) and absence of DC electric field (B-gel). The microstructures of hydrogels were characterized by environmental scanning electron microscope. Their electro-responsive property of hydrogels was investigated with their storage modulus (G'). The result demonstrates that the G' of A-gel is greater than that of B-gel, and the modulus of A-gel increases along with the external field, which signifies positive electroresponse. In addition, the G' of A-gel and B-gel ((G'(A) and G'(B)) also continuously increases with increasing starch concentration, whereas both the maximum of modulus increment (ΔG' = G'(A)−G'(B) ) and that of modulus increment sensitivity (ΔG'/G'(B)) occur with the starch weight fraction at around 36.5%. To enhance the electro-responsive effects of the hydrogels, dielectric particles were dispersed in the hydrogel. It is found that BaTiO3/chitosan core-shell composite particles significantly enhance the electroresponse of the hydrogel. The mechanism of the electro-response mode is proposed.
authors: a Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education , Shaanxi Normal University , Xi'an 710062 , P.R. China.
authors: Ling-xiang
authors: LX
authors: Gao
authors: Jian-li
authors: JL
authors: Chen
authors: Xue-wu
authors: XW
authors: Han
authors: Shu-xian
authors: SX
authors: Yan
authors: Yan
authors: Y
authors: Zhang
authors: Wei-qiang
authors: WQ
authors: Zhang
authors: Zi-wei
authors: ZW
authors: Gao
mesh_terms: D016880:Anisotropy; D017609:Barium Compounds / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D057005:Bioengineering; D055598:Chemical Phenomena; D048271:Chitosan / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry*; D016503:Drug Delivery Systems; D055119:Elastic Modulus; D055664:Electrochemical Techniques; D005976:Glutaral / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D016062:Porosity; D013213:Starch / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D017609:Barium Compounds; D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D020100:Hydrogels; C024547:barium titanate(IV); D013213:Starch; D048271:Chitosan; D014025:Titanium; D005976:Glutaral
keywords: barium titanate particles; electro-responsive property; starch hydrogel; storage modulus