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Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

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Self-organized target and spiral patterns through the "coffee ring" effect.

Yong-Jun Chen¹, Kosuke Suzuki², Kenichi Yoshikawa³

¹Department of Physics, Shaoxing University, Shaoxing, Zhejiang Province 312000, China.

The Journal of Chemical Physics

|September 3, 2015

Summary

This summary is machine-generated.

Fullerene C60 nanocrystal precipitation forms unusual target and spiral patterns, deviating from the typical coffee ring effect. These patterns depend on solution concentration, temperature, and vacuum levels.

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Evaporation of confined liquid bridges is a common method for generating nanocrystal precipitates.
The "coffee ring" effect, where particles deposit at the edge of a drying droplet, is the typically observed pattern.
Understanding precipitation patterns is crucial for controlling nanomaterial morphology and properties.

Purpose of the Study:

To investigate the precipitation patterns of fullerene C60 nanocrystals from a confined liquid bridge.
To identify the key experimental parameters influencing pattern formation and precipitate morphology.
To elucidate the underlying mechanisms of target and spiral pattern generation.

Main Methods:

Generation of fullerene C60 nanocrystals via evaporation of a confined liquid bridge.
Systematic variation of solution concentration, temperature, and vacuum levels.
Microscopic analysis of precipitate morphology and pattern characterization.

Main Results:

Observed target and spiral precipitation patterns, differing from the standard coffee ring.
Demonstrated critical dependence of pattern characteristics and precipitate morphology on concentration, temperature, and vacuum.
Interpreted pattern formation as a two-step rhythmic nucleation and precipitation process during contact line recession.

Conclusions:

Fullerene C60 precipitation is not limited to the coffee ring effect and can form complex target and spiral patterns.
Precise control over experimental parameters allows for tailoring of fullerene C60 nanocrystal precipitation patterns and morphology.
The observed patterns result from symmetric or disturbed contact line motion during liquid bridge evaporation.