Polymer hollow particles with controllable holes in their surfaces

Sang Hyuk Im; Unyong Jeong; Younan Xia

doi:10.1038/nmat1448

Polymer hollow particles with controllable holes in their surfaces

Sang Hyuk Im, Unyong Jeong, Younan Xia

Research output: Contribution to journal › Article › peer-review

537 Citations (Scopus)

Abstract

Colloidal particles with hollow interiors play important roles in microencapsulation - a process that has found widespread use in applications such as controlled release of drugs, cosmetics, inks, pigments or chemical reagents; protection of biologically active species; and removal of pollutants. The hollow particles are most commonly prepared by coating the surfaces of colloidal templates with thin layers of the desired material (or its precursor), followed by selective removal of the templates by means of calcination or chemical etching. This simple and straightforward approach works for a variety of materials that include polymers, ceramics, composites and metals. For polymers, methods such as emulsion polymerization, phase separation, crosslinking of micelles and self-assembly have also been demonstrated for generating hollow structures. However, diffusion through these closed shells with pores < 10 nm is often a slow process. To solve this problem, macroporous capsules have been fabricated by organizing colloids around liquid droplets to form colloidosomes or by controlling the mixing of liquid droplets. Here we report the preparation of another class of macroporous capsules - polymer shells with controllable holes in their surfaces. After loading of functional materials, the holes can be closed by means of thermal annealing or solvent treatment.

Original language	English
Pages (from-to)	671-675
Number of pages	5
Journal	Nature Materials
Volume	4
Issue number	9
DOIs	https://doi.org/10.1038/nmat1448
Publication status	Published - 2005 Sept
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported in part by an AFOSR-MURI grant on smart skin materials awarded to the University of Washington and a fellowship from the David and Lucile Packard Foundation. Y.X. is a Camille Dreyfus Teacher Scholar (2002–2007). S.H.I. and U.J. were also partially supported by the Post-Doctoral Fellowship Program of the Korean Science and Engineering Foundation (KOSEF). This work used the Nanotech User Facility at the University of Washington, a member of the National Nanotechnology Infrastructure Network funded by the NSF. Correspondence and requests for materials should be addressed to Y.X. Supplementary Information accompanies this paper on www.nature.com/naturematerials.

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1038/nmat1448

Cite this

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abstract = "Colloidal particles with hollow interiors play important roles in microencapsulation - a process that has found widespread use in applications such as controlled release of drugs, cosmetics, inks, pigments or chemical reagents; protection of biologically active species; and removal of pollutants. The hollow particles are most commonly prepared by coating the surfaces of colloidal templates with thin layers of the desired material (or its precursor), followed by selective removal of the templates by means of calcination or chemical etching. This simple and straightforward approach works for a variety of materials that include polymers, ceramics, composites and metals. For polymers, methods such as emulsion polymerization, phase separation, crosslinking of micelles and self-assembly have also been demonstrated for generating hollow structures. However, diffusion through these closed shells with pores < 10 nm is often a slow process. To solve this problem, macroporous capsules have been fabricated by organizing colloids around liquid droplets to form colloidosomes or by controlling the mixing of liquid droplets. Here we report the preparation of another class of macroporous capsules - polymer shells with controllable holes in their surfaces. After loading of functional materials, the holes can be closed by means of thermal annealing or solvent treatment.",

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Polymer hollow particles with controllable holes in their surfaces

Abstract

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