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arXiv · 2507.10147

Photothermal tuning of microparticle diffusion anisotropy in nematic lyotropic chromonic liquid crystal

Patrycja Kadzialka·Lech Sznitko·Pawel Karpinski
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Abstract

We report a photothermal approach to dynamically tuning the anisotropic diffusion of microparticles suspended in a lyotropic chromonic liquid crystal (LCLC) consisting of a 30 % aqueous solution of Sunset Yellow (SSY). By switching the illumination spectrum between non-absorbing (red) and strongly absorbing (blue) regimes matching the H-aggregate absorption bands of SSY, we demonstrate a significant enhancement in both overall particle mobility and directional diffusion anisotropy (Dx/Dy). While off-resonance illumination yields a standard anisotropy ratio of 3.0, resonant blue-light exposure drives a preferential unbinding along the molecular stacks, elevating the anisotropy ratio to 5.5. This light-dependent diffusion anisotropy offers a straightforward framework for optically controlled microfluidic sorting and active soft matter assembly.

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Patrycja Kadzialka, Lech Sznitko, Pawel Karpinski. 2025-07-14. Photothermal tuning of microparticle diffusion anisotropy in nematic lyotropic chromonic liquid crystal. https://arxiv.org/abs/2507.10147

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