The effects of droplet size on light scattering by polymer-dispersed liquid crystal (PDLC) films have been studied theoretically and experimentally. Rayleigh-Gans calculations predict that, provided the droplets scatter independently, backscattering will be maximum at wavelength lambda when the droplet radius is about lambda/7. noticeable for droplet volume fractions eta above about 0.2 and shift the radius for maximum backscattering to about lambda/5 as eta increases to 0.5. These calculations are consistent with hemispherical transmittance and reflectance measurements on PDLC films in which multiple scattering is known to be important. These measurements indicate that solar attenuation by PDLC films will probably be maximized by choosing droplet size to maximize backscattering of visible radiation. This choice also increases solar attenuation by absorption of radiation trapped inside a PDLC film by total internal reflection.
Journal of Applied Physics
Copyright 1991 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 69, 1605 (1991) and may be found at http://dx.doi.org/10.1063/1.347256.
Montgomery, G, Paul; West, John L; Tamuralis, W (1991). Light-Scattering from Polymer-Dispersed Liquid-Crystal Films - Droplet Size Effects. Journal of Applied Physics 69(3) 1605-1612. doi: 10.1063/1.347256. Retrieved from https://oaks.kent.edu/chempubs/12