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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Published on: May 15, 2017

Shape-dependent orientation of thermophoretic forces in microsystems.

Qi Li¹, Tengfei Liang, Wenjing Ye

¹Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 16, 2013

Summary

Microparticle manipulation is enhanced by a novel thermophoretic force sensitive to object shape. This shape-dependent force allows for tunable orientation, enabling new microparticle separation techniques.

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Last Updated: May 7, 2026

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Area of Science:

Physics and Applied Physics
Microfluidics and Nanotechnology

Background:

Classical thermophoresis is generally insensitive to microparticle shape.
Microfabrication techniques have introduced new types of thermophoretic forces.

Purpose of the Study:

To investigate the influence of microparticle shape on a specific type of thermophoretic force.
To reveal the underlying mechanism of shape-dependent thermophoresis in microsystems.
To explore the potential for tuning thermophoretic force orientation through shape design.

Main Methods:

Asymptotic analysis of the Boltzmann equation.
Theoretical investigation of thermophoretic phenomena in microscale systems.

Main Results:

A type of thermophoretic force highly sensitive to object shape was identified.
The orientation of this force can be tuned by designing the microparticle's shape.
The mechanism distinguishing this force from classical thermophoresis was elucidated.

Conclusions:

Microparticle shape is a critical factor in controlling thermophoretic force orientation in microsystems.
This shape-tunable thermophoretic force offers potential for advanced microparticle manipulation and separation technologies.