Gao Ling-xiang, Chen Jian-li, Han Xue-wu, Yan Shu-xian, Zhang Yan, Zhang Wei-qiang, Gao Zi-wei
a Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education , Shaanxi Normal University , Xi'an 710062 , P.R. China.
J Biomater Sci Polym Ed. 2015;26(9):545-57. doi: 10.1080/09205063.2015.1037587. Epub 2015 May 5.
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.
在有直流电场（A凝胶）和无直流电场（B凝胶）的情况下，实现了具有各向异性微观结构和动态行为的淀粉水凝胶的简便合成。用水环境扫描电子显微镜对水凝胶的微观结构进行了表征。通过储能模量（G'）研究了水凝胶的电响应特性。结果表明，A凝胶的G'大于B凝胶的G'，且A凝胶的模量随外部电场增加，这表明具有正电响应。此外，A凝胶和B凝胶的G'（G'(A)和G'(B)）也随着淀粉浓度的增加而持续增加，而模量增量最大值（ΔG' = G'(A)−G'(B)）和模量增量灵敏度最大值（ΔG'/G'(B)）均出现在淀粉质量分数约为36.5%时。为增强水凝胶的电响应效果，将介电粒子分散在水凝胶中。发现钛酸钡/壳聚糖核壳复合粒子显著增强了水凝胶的电响应。提出了电响应模式的机制。
