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Related Experiment Video

Updated: Oct 11, 2025

Pattern Generation for Micropattern Traction Microscopy

Pattern Generation for Micropattern Traction Microscopy

Published on: February 17, 2022

Dynamic pattern selection in polymorphic elastocapillarity.

Jonghyun Ha¹, Yun Seong Kim¹, Ryan Siu¹

¹Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. tawfick@illinois.edu.

|December 2, 2021

Summary

This summary is machine-generated.

Drying hair bundles causes unique shape changes like stars or polygons due to liquid drainage. This study reveals the mechanism behind these dynamic self-assembly patterns in fibers.

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Last Updated: Oct 11, 2025

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Area of Science:

Physics of soft matter
Fluid dynamics
Materials science

Background:

Drying of fine hairs and fibers leads to significant capillary-driven deformation.
Observed peculiar self-assembly of hair bundles into distinct patterns based on bundle length and liquid drain rate.

Purpose of the Study:

Propose a mechanism for pattern selection in self-assembling hair bundles.
Derive and validate theoretical scaling laws for polymorphic self-assembly.
Investigate the physics of dynamic elastocapillarity during drying.

Main Methods:

Experiments involving submerging hair bundles in a liquid bath and then draining the liquid.
Observation of bundle morphing into stars, polygons, or circles based on drain rates and fiber length.
Analysis of a two-stage self-assembly mechanism in the high drain rate regime.

Main Results:

Identified distinct self-assembly patterns (stars, polygons, circles) driven by liquid drainage dynamics.
Described a two-stage mechanism for high drain rates: initial corner compression and subsequent tight packing.
Characterized a slow drainage regime where fibers aggregate without initial dynamic rearrangement.

Conclusions:

The study elucidates the mechanism of dynamic elastocapillarity in fiber drying.
Findings offer insights into the complex physics of wet granular drying.
Theoretical scaling laws were derived and validated for polygonal hair bundle self-assembly.