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.

Aggressive strategies for regenerating intervertebral discs: stimulus-responsive composite hydrogels from single to multiscale delivery systems

“…105 Electrically sensitive hydrogels containing acrylamide with carboxylic acid groups have been used to prepare drug delivery scaffolds; for example, BaTiO 3 /CS core–shell composite particles can be used to significantly enhance the electrical responsiveness of starch hydrogels. 195…”

Peanut shaped titanium oxide micro-particles achieved by cathode plasma electrolysis and their electrorheological characteristics

“…Since the ER effect was first described by Winslow [5] in 1949, the applications of ER fluids were hindered by problems such as low value of shear yield stress, high leaking current density through the fluids, strong temperature dependence and poor durability, most of which were mainly caused by the particles [3]. Hence, various kinds of micro or nano-materials have been explored as the electrically polarizable particles, including dielectric inorganics [6][7][8][9][10][11], semiconducting polymers [12,13], and polymer-inorganic composites [14][15][16][17][18].…”