4.8 Article

Transformable Colloidal Polymer Particles with Ordered Internal Structures

Journal

SMALL
Volume 17, Issue 4, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202006132

Keywords

3D soft confinement; block copolymers; colloidal particles; morphological transformation; solvent annealing

Funding

  1. National Natural Science Foundation of China [51525302, 51811540404]
  2. Fundamental Research Funds for the Central Universities [2020kfyXJJS011]

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Based on studies combining experiments and simulations, researchers presented internally ordered colloidal particles capable of morphological transformations in both shape and internal structure. By controlling solvent selectivity and annealing time, the morphology of the particles can be well controlled. The study offers potential applications in areas such as photonic crystal, drug delivery, sensor and smart coating design.
Based on studies combining experiments and simulations, internally ordered colloidal particles that are able to undergo morphological transformations both in shape and internal structure are presented. The particles are prepared by emulsion solvent evaporation-induced 3D soft confined assembly of di-block copolymer polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP). Control over the solvent selectivity leads to a dramatic change in shape and internal structure for particles. Pupa-like particles of lamellar morphology are obtained when using a non-selective solvent, while patchy particles possessing a plum pudding structure formed when the solvent is selective for PS-block. More interestingly, 3D soft confined annealing drives order-order morphological transformation of the particles. The morphology of reshaped particles can be well controlled by varying the solvent selectivity, annealing time, and interfacial interaction. The experimental results can be explained based on simulations. This study can offer considerable scope for the design of new stimuli-responsive colloidal particles for potential applications in photonic crystal, drug delivery and release, sensor and smart coating, etc.

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