We applied the dynamic light scattering (DLS) technique for studying single microdroplets of dispersions of ${\mathrm{SiO}}_2$ and ${\mathrm{TiO}}_2$ nanoparticles. The evaporating microdroplets were levitating in an electrodynamic quadrupole trap. Exponentially decaying autocorrelation functions (ACFs) were obtained for the light scattered by evaporating microdroplets as well as for microaggregates of nanoparticles formed at the end of the evaporation process. It was found that the temporal variation of the ACF generally reflects the evolution of the microdroplet of dispersion. At the initial stage of the evaporation, apart from the optical morphology resonances of the droplet (dielectric sphere), it was possible to identify the characteristic times corresponding to the Brownian motion of the dispersed nanoparticles. At the end of evolution, when the drying microdroplet transforms into a (non-rigid) microaggregate, the Brownian motion of the dispersed nanoparticles was masked by the rotational Brownian motion of the microaggregate as a whole.

我们应用动态光散射（DLS）技术来研究单个微滴的分散体 ${\mathrm{二氧化硅}}_2$ 和 ${\mathrm{二氧化钛}}_2$纳米粒子。蒸发的微滴悬浮在电动四极阱中。对于通过蒸发微滴散射的光以及在蒸发过程结束时形成的纳米颗粒的微聚集体，获得了指数衰减的自相关函数（ACF）。发现ACF的时间变化通常反映分散体的微滴的演变。在蒸发的初始阶段，除了液滴（介电球）的光学形态共振外，还可以确定与分散的纳米粒子的布朗运动相对应的特征时间。在进化的最后，当干燥的微滴转变成（非刚性的）微骨料时，