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High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

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Published on: September 2, 2009

Inverse Lehmann effects can be used as a microscopic pump.

Daniel Svensek¹, Harald Pleiner, Helmut R Brand

¹Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1111 Ljubljana, Slovenia. daniel.svensek@fmf.uni-lj.si

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

|October 15, 2008

Summary

Researchers predict that creating spatial patterns in chiral liquid crystals can generate particle and ion currents. This inverse Lehmann effect may also produce heat and electric currents, offering new possibilities for microscale transport.

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Area of Science:

Condensed matter physics
Soft matter physics
Chiral materials science

Background:

The Lehmann effect describes the rotation of helical superstructures in cholesteric and chiral smectic liquid crystals under external fields.
Macroscopic chirality is a key property shared by various systems, including liquid crystals and Langmuir monolayers.

Purpose of the Study:

To predict the inverse Lehmann effect, leading to particle and ion pumping.
To explore the generation of concentration currents in chiral systems.
To investigate accompanying heat and electric currents under specific experimental conditions.

Main Methods:

Theoretical prediction of particle and ion transport.
Analysis of spatial pattern generation in freely suspended smectic C* films.
Investigation of conditions for generating concentration, heat, and electric currents.

Main Results:

Spatial patterns, such as phase winding or spiral patterns, can induce a concentration current.
This concentration current can be accompanied by heat and/or electric currents.
The effect is predicted for various chiral systems, including smectic F*, I*, and Langmuir monolayers.

Conclusions:

The inverse Lehmann effect offers a mechanism for microscale pumping of particles and ions.
Chiral liquid crystals and related systems can be utilized to generate coupled mass, heat, and charge transport.
This research opens avenues for novel applications in microfluidics and energy harvesting.