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Gradient stretching to produce variable aspect ratio colloidal ellipsoids.

Samuel Trevenen¹, Peter J Beltramo¹

¹Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA.

Journal of Colloid and Interface Science

|October 4, 2020

Summary

This study introduces a novel film-stretching technique to rapidly synthesize polymer colloids with varying aspect ratios. This method allows for precise control over particle dimensions, crucial for developing advanced functional materials.

Keywords:

Anisotropic particles Colloids Complex fluids Ellipsoids Materials Polymer microparticles Self-assembly

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Area of Science:

Polymer Science
Materials Science
Colloid Chemistry

Background:

Developing shape-anisotropic polymer colloids is critical for creating novel functional materials.
Understanding how particle size and aspect ratio influence macroscopic properties requires extensive screening.
Existing methods lack efficiency in producing a wide range of aspect ratios simultaneously.

Purpose of the Study:

To present a new synthetic method for producing a broad range of polymer ellipsoid aspect ratios in a single step.
To enable the systematic study of how microscopic particle characteristics affect macroscopic material responses.
To facilitate the selective harvesting of ellipsoids with desired dimensions.

Main Methods:

Adaptation of the traditional film-stretching technique by introducing a gradient in strain and film cooling.
Creation of varying degrees of particle stretching based on controlled film characteristics.
Empirical calibration of the device to predict final particle elongation from film properties.

Main Results:

Simultaneous production of polymer ellipsoid samples with a wide range of aspect ratios from a single synthetic step.
Successful application to seed particle diameters ranging from 500 nm to 10 μm.
Enabling selective harvesting and isolation of ellipsoids based on desired dimensions and aspect ratios.

Conclusions:

The described technique offers a rapid and efficient method for synthesizing variable aspect ratio polymer particles.
This advancement is vital for systematic investigations into anisotropic particle behavior in functional materials.
The ability to precisely control particle dimensions opens new avenues for materials design and application.