Center for Urban Energy Systems, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Korea.
Phys Chem Chem Phys. 2013 Oct 21;15(39):16527-32. doi: 10.1039/c3cp51907d. Epub 2013 Aug 15.
Herein, the mixing effect of amine and carboxyl groups on electrorheological (ER) properties has been presented with the chitosan and alginic acid dispersed suspensions. Chitosan (for the amine group) and alginic acid (for the carboxyl group) are used to investigate the mixing effect of the amine and carboxyl groups on ER properties with the control of their mixing ratio in the silicone oil. The surface-chemical structure of the mixture of the chitosan and alginic acid particles in the silicone oil is demonstrated by in situ Fourier transform infrared (FT-IR) spectroscopy at various electric fields for the first time. This study focuses on whether the mixture of chemical groups in the ER fluid can promote ER properties or not, and in situ FT-IR analysis of the interface between ER particles in the silicone oil at various DC electric fields. The ER fluids exhibited the increase of the yield stress values with the increase of the counter group addition up to the weight ratio of 50 : 50 (chitosan : alginic acid). A noteworthy result is that the mixing effect of the amine and carboxyl groups resulting in enhanced ER properties is clearly proved. In the in situ FT-IR study, the complex form of amine and carboxyl groups of particles in the ER fluid was confirmed under the electric field.
本文介绍了壳聚糖和海藻酸分散悬浮液中胺基和羧基的混合效应对电流变（ER）性能的影响。壳聚糖（用于胺基）和海藻酸（用于羧基）用于研究胺基和羧基在硅油中的混合比对 ER 性能的混合效应，并控制其混合比。通过原位傅里叶变换红外（FT-IR）光谱首次在不同电场下对硅油中壳聚糖和海藻酸颗粒混合物的表面化学结构进行了证明。本研究重点研究了 ER 流体中的化学基团混合物是否可以促进 ER 性能，以及在不同直流电场下硅油中 ER 颗粒界面的原位 FT-IR 分析。ER 流体的屈服应力值随着抗衡离子添加量的增加而增加，最高可达 50:50（壳聚糖：海藻酸）的重量比。值得注意的是，明显证明了胺基和羧基的混合效应对增强 ER 性能的作用。在原位 FT-IR 研究中，在电场下证实了 ER 流体中颗粒的胺基和羧基的复杂形式。
