Experimental elastic-scattering characteristics of single evaporating liquid microdroplet of solution and suspension are
reported. The microdroplets studied were composed of: (i) silica (SiO2) nanoparticles (225 nm radius) dispersed in
diethylene glycol (DEG) liquid suspension (ii) DEG and Sodium dodecyl sulfate (SDS) solution, and (iii) SiO2
nanoparticles dispersed in DEG and SDS solution. We observed regular Mie type fringes from (i), (ii) and (iii) at the
initial stages of the evaporation process followed by intensity fluctuations (speckles) for (i) and surface reflections
(blinking of scattered light intensities) for (ii) during the inclusions surface layer formation. For (iii), Mie-type fringes,
and a mixture of surface reflections (blinking of scattered light intensities) and intensity fluctuations (speckles) was
observed. The changes in the intensities and polarization of the scattered light showed characteristic stages of
evaporation driven processes occurring at the droplet surface. The observed phenomenon carry information about the
inclusions’ mean distances, size, and stages of aggregation of SiO2 nanoparticles and crystallization of SDS
nanocrystallites on the droplet surface. Additionally, we deposited samples of the final dried composite microobject on a
silicon substrate and analyzed with SEM. The study provide different surface diagnostic methods of configuration
changes in complex systems of nano-and microparticles evolving at the sub-wavelength scale and serves as an alternative
method for studying stages of droplet with submicron inclusions evaporation processes.
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