posted on 2022-01-19, 10:13authored byMizuho Ono, Yoshimune Nonomura, Hiroki Gonome
A significant number of studies have
been conducted on particle
adhesion phenomena as pertaining to the oil–water interface
of droplets and the air–liquid interface of bubbles, known
as Pickering emulsions and Pickering foams, respectively. However,
few of the literature reports have discussed the optical properties
of these materials. In this study, the optical properties of Pickering
particles were calculated by using an electromagnetic field analysis
via a finite element method, and their optical responses are discussed.
The changes in scattering due to the differences in the number of
adhering particles and particle size are compared for three composition
systems: an oil-in-water Pickering emulsion, a water-in-oil Pickering
emulsion, and a Pickering foam. It was determined that changes in
the amount of scattering are due to the mixing of the phases in the
scattering field. This effect is more pronounced when the size of
the scatterer is significantly smaller than the wavelength. For systems
with particles larger than the wavelength, changes in the amount of
scattering were suppressed because of destructive interference of
the electromagnetic waves. This work revealed that the variation in
the amount of scattering due to the constituent material and size
of the Pickering particles is affected by two different factors, and
the change in the amount of scattering is 10 times greater than in
a uniformly dispersed system.