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首页> 外文期刊>The European physical journal, E. Soft matter >Surface-functionalized nanoparticles with liquid-like behavior: The role of the constituent components
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Surface-functionalized nanoparticles with liquid-like behavior: The role of the constituent components

机译:具有类似液体行为的表面官能化纳米颗粒:组成成分的作用

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摘要

Ionically modified silica nanoparticles with large counter anions (sulfonate, isostearate) at two silica volume fractions (13 and 27%) form a viscous fluid and a glass but not crystalline solids. Dielectric spectroscopy, Brillouin scattering and shear rheometry were employed to investigate these new nanoparticle-based fluids. The glass transition temperature and hence the local dynamics are governed by the large counter anions, whereas the flow properties can be controlled by the spatial correlation between the nanoparticles, e.g. by tuning the volume fraction of hard cores and local interactions between segments in the soft corona. Liquid-like ordering of the cores was revealed by X-ray scattering and found to influence significantly the macroscopic flow properties of these salts.
机译:具有两个二氧化硅体积分数(分别为13%和27%)的较大抗衡阴离子(磺酸根,异硬脂酸根)的离子改性的二氧化硅纳米颗粒形成了粘性流体和玻璃,但没有结晶固体。介电谱,布里渊散射和剪切流变法被用来研究这些新的基于纳米颗粒的流体。玻璃化转变温度以及由此的局部动力学受大的抗衡阴离子支配,而流动性可以由纳米颗粒之间的空间相关性例如纳米颗粒控制。通过调节硬核的体积分数和软电晕中各节之间的局部相互作用。 X射线散射揭示了核的液体状排列,发现它们显着影响了这些盐的宏观流动性能。

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