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首页> 外文期刊>RSC Advances >Graphene oxide modified by betaine moieties for improvement of electrorheological performance
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Graphene oxide modified by betaine moieties for improvement of electrorheological performance

机译：甜菜碱部分修饰的氧化石墨烯可改善电流变性能

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摘要

Novel graphene oxide bearing betaine moieties as sulfobetaine (GO-SB), carboxybetaine (GO-CB) and carboxybetaine ester (GO-CBE) moieties were prepared in two simple fabrication processes based on silanization and a thiol-ene click-reaction. Betaine modified particles showed appropriate electrical conductivity for electrorheological applications and the electrorheological behavior was confirmed by on-line microscopic observation. Analysis of the dielectric data using the Havriliak-Negami model showed that the suspension bearing the carboxybetaine ester moiety (GO-CBE) in silicone oil had the highest dielectric relaxation strength and fastest relaxation time due to enhanced charge transfer caused by a specific carboxybetaine ester feature. Analysis of the rheological data of the prepared suspensions at various external fields by the power-law model revealed that the conductivity mechanism is responsible for the electrorheological effect. Development of the internal structures was considerably improved for the GO-CBE sample with a yield stress up to 97 Pa at 5 wt% GO-CBE particles in suspension.
机译：在基于硅烷化和硫醇-烯点击反应的两个简单制备过程中，制备了带有甜菜碱部分的新氧化石墨烯，所述甜菜碱部分为磺基甜菜碱（GO-SB），羧基甜菜碱（GO-CB）和羧基甜菜碱酯（GO-CBE）部分。甜菜碱改性的颗粒显示出适合电流变应用的导电性，并且通过在线显微镜观察证实了电流变行为。使用Havriliak-Negami模型对介电数据进行分析表明，由于特定的羧基甜菜碱酯特征导致电荷转移增强，硅油中带有羧基甜菜碱酯部分（GO-CBE）的悬浮液具有最高的介电弛豫强度和最快的弛豫时间。 。通过幂律模型对制备的悬浮液在各种外部场的流变数据进行分析，发现电导率机制是引起电流变效应的原因。 GO-CBE样品的内部结构发展得到了显着改善，在悬浮液中含有5 wt％的GO-CBE颗粒时，屈服应力高达97 Pa。

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