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Related Experiment Video

Updated: Aug 6, 2025

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Continuous flow microfluidics for colloidal particle assembly on porous substrates.

Varun Lochab1, E Daniel Ewim1, Shaurya Prakash1

  • 1Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, 43210, OH, USA. prakash.31@osu.edu.

Soft Matter
|March 21, 2023
PubMed
Summary

A novel template-free method enables rapid self-assembly of colloidal particles into high-aspect ratio structures using continuous flow and porous substrates. This technique offers a faster, more versatile alternative to traditional templating and solvent evaporation methods for bottom-up fabrication.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Colloidal particle self-assembly is crucial for bottom-up fabrication in diverse applications like energy and biosensing.
  • Existing methods like substrate templating and solvent evaporation have limitations in terms of substrate preparation, assembly time, and environmental control.

Purpose of the Study:

  • To demonstrate a template-free, continuous flow process for self-assembling colloidal particles.
  • To achieve rapid formation of high-aspect ratio structures using this novel method.

Main Methods:

  • A continuous flow process utilizing continuous solvent drainage through porous substrates was employed.
  • Colloidal particles were assembled on both polymeric and metallic porous membranes.

Main Results:

  • High-aspect ratio colloidal particle structures (aspect ratio >10^3) were successfully fabricated.
  • Rapid assembly times were achieved compared to conventional methods.
  • Linear arrays and grid structures were formed using the template-free approach.

Conclusions:

  • The demonstrated continuous flow process offers an efficient and rapid method for colloidal particle self-assembly.
  • This template-free technique overcomes limitations of previous methods, enabling versatile fabrication of complex structures.
  • The process is applicable to various porous substrates, expanding its potential applications.