Brownian fluctuations, hydrodynamics and elasticity of a microhelix

Silvio Bianchi; Viridiana Carmona Sosa; Gaszton Vizsnyiczai; Roberto Di Leonardo

doi:10.1117/12.2570778

22 August 2020 Brownian fluctuations, hydrodynamics and elasticity of a microhelix

Silvio Bianchi, Viridiana Carmona Sosa, Gaszton Vizsnyiczai, Roberto Di Leonardo

Proceedings Volume 11463, Optical Trapping and Optical Micromanipulation XVII; 114630X (2020) https://doi.org/10.1117/12.2570778
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

We use optical tweezers to study the mechanic and hydrodynamic properties of micro-fabricated helices suspended in a fluid. In rigid helices we track Brownian fluctuations around mean values with a high precision and over a long observation time. Through the statistical analysis of fluctuations in translational and rotational coordinates we recover the full mobility matrix of the micro-helix including the off diagonal terms related with roto-translational coupling. Exploiting the high degree of spatial control provided by optical trapping, we can systematically study the effect of a nearby wall on the roto-translational coupling, and conclude that a rotating helical propeller moves faster near a no-slip boundary. We also study the relaxation dynamics of deformable micro-helices stretched by optical traps. We find that hydrodynamic drag only weakly depends on elongation resulting in an exponential relaxation to equilibrium.

Conference Presentation

Citation Download Citation

Silvio Bianchi, Viridiana Carmona Sosa, Gaszton Vizsnyiczai, and Roberto Di Leonardo "Brownian fluctuations, hydrodynamics and elasticity of a microhelix", Proc. SPIE 11463, Optical Trapping and Optical Micromanipulation XVII, 114630X (22 August 2020); https://doi.org/10.1117/12.2570778

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