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首页> 外文期刊>Journal of industrial and engineering chemistry >Electrohydrodynamic instabilities of polymer thin films: Filler effect
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Electrohydrodynamic instabilities of polymer thin films: Filler effect

机译：聚合物薄膜的电流体动力学不稳定性：填充效应

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摘要

The influence of various nanoparticles with different dimension, density, dielectric constant, and surface property on electrohydrodynamic (EHD) instabilities of polymeranoparticle nanocomposite thin films was examined as a function of nanoparticle concentration. Transmission electron microscopy (TEM) images of polystyrene {PS)anoparticles (NPs) thin films demonstrated that all the nanoparticles were uniformly distributed in polymer matrix and the homogeneous dispersions of nanoparticles were not affected by thermal annealing above glass transition temperature. Optical microscopy (OM) observations indicated that thin films of polystyrene containing silica (SiO2), gold (Au), cadmium selenide (CdSe), and titania (TiO2) nanoparticles showed electrohydrodynamic instability patterns similar to those seen in pure polystyrene, up to 3 vol% nanoparticles. The presence of nanoparticles changed the dielectric constant of the thin films, which led to systematic variations in the wavelengths of the surface instabilities, which were consistent with calculated values. Cross-sectional transmission electron microscopy (TEM) images showed that migration or aggregation of the nanoparticles occurred only for silica contrary to other nanoparticles. This work points to a simple route to reduce the scale of final well-ordered columnar structures.
机译：考察了具有不同尺寸，密度，介电常数和表面性质的各种纳米颗粒对聚合物/纳米颗粒纳米复合薄膜电流体动力学（EHD）不稳定性的影响，并作为纳米颗粒浓度的函数。聚苯乙烯（PS）/纳米粒子（NPs）薄膜的透射电子显微镜（TEM）图像表明，所有纳米粒子均均匀地分布在聚合物基质中，并且纳米粒子的均匀分散体不受玻璃化温度以上的热退火影响。光学显微镜（OM）观察表明，含有二氧化硅（SiO2），金（Au），硒化镉（CdSe）和二氧化钛（TiO2）纳米颗粒的聚苯乙烯薄膜显示出与纯聚苯乙烯类似的电流体动力学不稳定性模式，最高可达3体积％纳米颗粒。纳米粒子的存在改变了薄膜的介电常数，从而导致表面不稳定性的波长发生系统变化，这与计算值一致。横截面透射电子显微镜（TEM）图像显示，与其他纳米颗粒相反，仅纳米颗粒发生了纳米颗粒的迁移或聚集。这项工作指出了减少最终井井有条的柱状结构规模的简单途径。

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