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Multicompartment Microparticles with Patchy Topography through Solvent-Adsorption Annealing.

Xiaolian Qiang¹, Xuezhi Dai¹, Andrea Steinhaus¹

¹Physical Chemistry and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany.

ACS Macro Letters

|May 27, 2022

Summary

Evaporation-induced confinement assembly (EICA) creates multicompartment microparticles from block terpolymers. Changing surfactants during annealing transforms these into spheres with unique patchy surfaces.

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Area of Science:

Polymer Science
Materials Science
Nanotechnology

Background:

Block terpolymers self-assemble into complex morphologies.
Controlling microparticle shape and surface topography is crucial for advanced materials.

Purpose of the Study:

To investigate the morphological evolution of polystyrene-block-polybutadiene-block-poly(methyl methacrylate) (PS-b-PB-b-PMMA) microparticles.
To explore the use of evaporation-induced confinement assembly (EICA) for generating multicompartment and patchy microparticles.

Main Methods:

Utilized evaporation-induced confinement assembly (EICA) with PS-b-PB-b-PMMA triblock terpolymers.
Employed solvent vapor annealing with sequential surfactant exchange (CTAB to PVA) using chloroform.
Analyzed microparticle morphology and surface topography evolution.

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Main Results:

Initially formed elliptic microparticles with axially stacked PS/PB/PMMA morphology using CTAB.
Transformed microparticles into spheres with concentric morphology upon PVA surfactant exchange.
Observed a simultaneous transformation initiating at poles and progressing equatorially, yielding patchy topography.
Demonstrated the generality of the mechanism across different PB fractions.

Conclusions:

EICA is a versatile method for creating multicompartment microparticles.
Surfactant exchange during solvent annealing drives significant morphological changes.
The EICA process effectively generates microparticles with tunable patchy surfaces.