Tu Haohua, Ray Asit K
Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, IL 61801, USA.
Appl Opt. 2006 Oct 10;45(29):7652-6. doi: 10.1364/ao.45.007652.
Two pairs of immiscible liquid compounds are chosen to prepare levitated layered droplets with and without density difference between core and layer phases. The droplets are examined by light scattering along two orthogonal directions. A layered droplet without phase density difference is unambiguously identified as a concentric sphere by matching the observed scattering spectra with those calculated from the Aden-Kerker extension of Mie theory. For layered droplets with phase density difference, only the scattering spectrum from one of the scattering directions can be matched theoretically. These observations suggest that a static layered droplet is predominantly eccentric even though the embedded core is large by volume, as predicted from fluid mechanics. The consistency of the light-scattering characterization with the diffusion theory governing the evaporation of concentrically and eccentrically layered droplets is also established.
选择两对不混溶的液体化合物来制备核相和层相之间有或没有密度差的悬浮层状液滴。通过沿两个正交方向的光散射来检查这些液滴。通过将观察到的散射光谱与根据米氏理论的阿登 - 克尔克扩展计算出的光谱进行匹配，明确将没有相密度差的层状液滴识别为同心球体。对于具有相密度差的层状液滴，理论上只能匹配来自其中一个散射方向的散射光谱。这些观察结果表明，即使嵌入的核在体积上很大，静态层状液滴也主要是偏心的，这正如流体力学所预测的那样。还建立了光散射表征与控制同心和偏心层状液滴蒸发的扩散理论之间的一致性。
