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首页> 外文期刊>Physica, B. Condensed Matter >Dynamics of caged microemulsion droplets: a neutron spin echo and dynamic light scattering study
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Dynamics of caged microemulsion droplets: a neutron spin echo and dynamic light scattering study

机译:笼状微乳液液滴的动力学:中子自旋回波和动态光散射研究

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摘要

We report a neutron spin echo (NSE) and dynamic light scattering (DLS) study of droplet dynamics in a microemulsion at high droplet packing fraction (Phi(dropplet) similar to62%). NSE measurements in range qr much greater than I allow to investigate the short-range Brownian motion of droplets trapped within the cages formed by their nearest neighbors. For a particular scattering contrast, NSE also reveals, for q values around qr similar to pi, the shape fluctuations of the caged droplets. In range qr much less than 1, DLS correlation functions reveal two independent diffusive modes with well separated decay times. Comparing DLS results with NSE and pulsed-field gradient NMR measurements allows to associate both DLS modes with collective dynamics of 'transient-trapped' droplets, revealing strong similarity to the long-time and short-time diffusion modes observed by light scattering in concentrated colloidal suspensions below the glass transition. (C) 2004 Elsevier B.V. All rights reserved.
机译:我们报告中子自旋回波(NSE)和动态光散射(DLS)在高液滴堆积分数(Phi(dropplet)相似,为62%)的微乳液中的液滴动力学研究。 NSE在qr范围内的测量结果远大于我允许的范围,它研究了由其最近邻居形成的笼中捕获的液滴的近距离布朗运动。对于特定的散射对比度,对于类似于pi的qr附近的q值,NSE还显示了笼状液滴的形状波动。在远小于1的qr范围内,DLS相关函数揭示了两个独立的扩散模式,其衰减时间间隔良好。将DLS结果与NSE和脉冲场梯度NMR测量结果进行比较,可以将两种DLS模式与“瞬态捕获”液滴的集体动力学相关联,从而显示出与通过浓胶体中的光散射观察到的长期和短期扩散模式的强相似性玻璃过渡下方的悬浮液。 (C)2004 Elsevier B.V.保留所有权利。

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