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In Vitro Multiparametric Cellular Analysis by Micro Organic Charge-modulated Field-effect Transistor Arrays

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Published on: September 20, 2021

Bioinspired Capillary Transistors.

Xiaojiang Liu^1,2,3, Ming Gao³, Boyuan Li³

¹State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.

Advanced Materials (Deerfield Beach, Fla.)

|August 14, 2024

Summary

This summary is machine-generated.

Researchers developed 3D-printed asymmetric re-entrant structures that significantly enhance unidirectional capillary height to 102.3 mm for water. These structures enable programmable capillary transistors for advanced liquid manipulation in microfluidic devices.

Keywords:

3D printing capillary transistor microfluidics re‐entrant structure unidirectional liquid spreading

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Area of Science:

Microfluidics
Materials Science
Surface Science

Background:

Natural surfaces inspire microfluidic devices for various applications like water collection and separation.
Existing artificial structures often have limited unidirectional capillary height (<30 mm) due to insufficient enhancement of Laplace pressure difference and capillary forces.

Purpose of the Study:

To design and fabricate novel microstructures that overcome the limitations of current designs and achieve significantly enhanced unidirectional capillary heights.
To develop programmable capillary transistors for precise control over liquid behavior in three-dimensional microfluidic systems.

Main Methods:

Fabrication of asymmetric re-entrant structures with long overhangs and connected microchannels using 3D printing.
Investigation of the impact of overhangs on Laplace pressure difference and capillary force.
Design and realization of capillary transistors based on asymmetric and symmetric re-entrant structures.

Main Results:

Achieved a significantly increased unidirectional capillary height of 102.3 mm for water, approaching the theoretical limit.
Demonstrated that overlapping overhangs enhance both Laplace pressure difference and capillary force.
Successfully proposed and realized capillary transistors capable of programmably adjusting capillary direction, height, and width.

Conclusions:

The developed asymmetric re-entrant structures represent a breakthrough in enhancing unidirectional capillary flow in microfluidics.
Programmable capillary transistors offer novel functionalities for advanced liquid manipulation.
These advancements hold promise for applications in liquid patterning, desalination, and biochemical microreactions.