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Summary

Researchers created coatings with vertical composition gradients by drying polymer dispersions. Charged particles moved faster than neutral ones, leading to segregation and a new method for making functionally graded materials (FGMs).

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Area of Science:

Materials Science
Polymer Science
Colloid Science

Background:

Vertical gradients in material composition are challenging to achieve efficiently.
Controlling particle segregation during drying is key for creating advanced materials.
Understanding particle dynamics in drying films is crucial for material design.

Purpose of the Study:

To develop a method for creating vertical composition gradients in polymer coatings.
To investigate the mechanism of particle segregation during the drying of polymer dispersions.
To demonstrate the potential for creating functionally graded materials (FGMs) in a single step.

Main Methods:

Drying an aqueous polymer dispersion containing both charged and neutral particles.
Analyzing the vertical composition profile of the dried films.
Investigating the role of collective diffusivity in particle segregation.

Main Results:

Neutral particles were enriched at the film/air interface after drying.
Spontaneous vertical segregation occurred due to differences in collective diffusivity between charged and neutral particles.
A concentration gradient persisted in the dried film when drying time was optimized.

Conclusions:

Differences in collective diffusivity drive spontaneous vertical segregation of charged and neutral particles during drying.
This phenomenon allows for the creation of functionally graded materials (FGMs) with tunable composition gradients.
The described method offers a single-step approach for producing FGMs, simplifying material fabrication.