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Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

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Bioinspired Cilia Array Surfaces for Programmable Unidirectional Liquid Transport across Surface Tension Regimes.

Shihao Guo1, Ziwei Guo1, Fuyuan Gui1

  • 1State Key Laboratory of Bioinspired Interfacial Materials Science, School of Chemistry, Beihang University, Beijing 100191, P. R. China.

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|June 30, 2026
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Summary

Bioinspired asymmetric cilia arrays achieve unidirectional liquid transport across an ultrabroad surface-tension range. This breakthrough enables programmable liquid routing by controlling gravity-capillarity dynamics.

Keywords:
capillary forcegravity−capillary balanceprogrammable microfluidicssurface tension regimesunidirectional liquid transport

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Area of Science:

  • Surface science and microfluidics
  • Bioinspired engineering and materials science

Background:

  • Unidirectional liquid transport is crucial for applications like water harvesting and microfluidics.
  • Current methods face limitations with narrow surface-tension ranges, hindering broader applicability.

Purpose of the Study:

  • To design and investigate bioinspired asymmetric cilia arrays (BACAs) for robust unidirectional liquid transport.
  • To explore the influence of surface tension, surface energy, and cilia spacing on transport dynamics.
  • To develop a theoretical framework for predicting and controlling liquid transport modes.

Main Methods:

  • Fabrication of bioinspired asymmetric cilia arrays mimicking *Alchemilla mollis* cilia.
  • Systematic experimental studies on liquid transport across a wide surface-tension range (22.2-72.8 mN m⁻¹).
  • Development of a theoretical model based on bidirectional transport contact angle for quantitative analysis.

Main Results:

  • BACAs achieved unidirectional liquid transport over an ultrabroad surface-tension range.
  • Transport modes (forward, reverse, bidirectional) were observed to be dependent on surface tension, surface energy, and cilia spacing.
  • A predictive framework accurately quantified transport modes, enabling programmable liquid routing.

Conclusions:

  • The developed BACAs offer a versatile platform for controlled liquid transport, overcoming limitations of existing technologies.
  • The theoretical framework provides a valuable tool for designing advanced microfluidic devices and systems.
  • This research opens new avenues for efficient atmospheric water harvesting, microfluidics, and heat transfer applications.