Highly transparent electrorheological fluids of silica nanoparticles: the effect of urea modification
Highly transparent electrorheological fluids of silica nanoparticles: the effect of urea modification
复制标题
二氧化硅纳米颗粒的高透明电流变液：尿素改性的效果
DOI：
10.1039/c6tc02154a
复制
发表时间：
2016
影响因子：
6.4
通讯作者：
Choi Hyoung Jin
中科院分区：
文献类型：
--
作者：
Hao Bo Nan;Guo Yun Xia;Liu Ying Dan;Wang Li-Min;Choi Hyoung Jin
以尿素分子修饰的二氧化硅纳米粒子为分散相，采用折射率匹配法制备了光学透明电流变液。通过分析四种不同浓度的尿素溶液处理过的二氧化硅纳米颗粒样品，研究了尿素改性的效果。透明性和电流变（ER）的TER流体的性能，其特征在于通过可见光谱仪和旋转流变仪，分别。的TER流体的介电性能，由宽带介电谱仪测定，以及它们的ER特性相关。实验结果还表明，尿素改性后TER液的剪切应力和储能模量得到了有效的提高。此外，随着尿素浓度的增加，相应的TER流体具有较高的介电常数，但较低的透明度和沉降稳定性。
Silica nanoparticles modified with urea molecules were used as a dispersed phase to prepare optically transparent electrorheological (TER) fluids by using a refractive index matching method. The effect of modification by urea was studied by analysing four samples of silica nanoparticles treated by urea solutions with different concentrations. Transparency and electrorheological (ER) performances of the TER fluids were characterised by a visible spectrometer and a rotational rheometer, respectively. Dielectric properties of the TER fluids, as determined by a broadband dielectric spectrometer, were well correlated with their ER characteristics. Our experimental results also showed that the shear stress and storage modulus of the TER fluids were effectively increased by the modification with urea. In addition, with increasing urea concentration, the corresponding TER fluids had a higher dielectric constant, but lower transparency and sedimentation stability.