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Updated: Jun 12, 2026
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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
Published on: November 4, 2021
Coffee-ring effect-based three dimensional patterning of micro/nanoparticle assembly with a single droplet.
Sun Choi1, Stefano Stassi, Albert P Pisano
1Berkeley Sensor and Actuator Center, University of California at Berkeley, Berkeley, California 94720, USA. sunchoi@eecs.berkeley.edu
Langmuir : the ACS Journal of Surfaces and Colloids
|June 10, 2010
Summary
Researchers developed a novel 3D patterning technique using evaporative self-assembly and the coffee-ring effect. This method efficiently creates diverse micro and nanoparticle patterns without sintering.
Area of Science:
- Materials Science and Engineering
- Nanotechnology
- Surface Chemistry
Background:
- Micro and nanoparticle assembly is crucial for advanced materials.
- Existing methods often require complex steps like sintering.
- Evaporative self-assembly offers a potential route for pattern fabrication.
Purpose of the Study:
- To develop a novel patterning technique for 3D micro and nanoparticle assembly.
- To investigate the underlying principles and key parameters influencing the process.
- To demonstrate the versatility of the technique with various particle types.
Main Methods:
- Utilized evaporative self-assembly driven by the coffee-ring effect.
- Performed theoretical analysis using scaling laws for process parameters.
- Studied the influence of suspension volume, concentration, and surface treatment.
Main Results:
- Successfully generated 3D patterns of silica, TiO(2), ZnO, and Ag nanoparticles.
- Achieved pattern formation using low-concentration suspensions (1.25-5 wt %) without sintering.
- Demonstrated fine control over pattern geometry by adjusting process parameters.
Conclusions:
- The novel evaporative self-assembly technique enables efficient 3D patterning of diverse micro and nanoparticles.
- The process is controllable and scalable, offering a versatile platform for material fabrication.
- This method provides a simplified approach to creating complex particle assemblies.
