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Updated: May 21, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
Published on: September 8, 2016
Observation of anisotropic diffusion of light in compacted granular porous materials
Erik Alerstam1, Tomas Svensson
1Department of Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden. erik.alerstam@fysik.lth.se
Abstract:
By analyzing spatio-temporal characteristics of short optical pulses diffusively transmitted through compacted granular materials, we reveal that powder compaction can give rise to strongly anisotropic light diffusion. Our disclosure represents a revision of the understanding of optics of powder compacts. Routes to material characterization and investigation of compression-induced structural anisotropy are opened, and the falsification of isotropic models have implications for quantitative spectroscopy of powder compacts (e.g., pharmaceutical tablets).

