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 | |
| Publication status | Published - 2005 Jan 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Polymer hollow particles with controllable holes in their surfaces. / Im, Sang Hyuk; Jeong, Unyong; Xia, Younan.
In: Nature Materials, Vol. 4, No. 9, 01.01.2005, p. 671-675.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Polymer hollow particles with controllable holes in their surfaces
AU - Im, Sang Hyuk
AU - Jeong, Unyong
AU - Xia, Younan
PY - 2005/1/1
Y1 - 2005/1/1
N2 - 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.
AB - 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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UR - http://www.scopus.com/inward/citedby.url?scp=26944467652&partnerID=8YFLogxK
U2 - 10.1038/nmat1448
DO - 10.1038/nmat1448
M3 - Article
C2 - 16086022
AN - SCOPUS:26944467652
VL - 4
SP - 671
EP - 675
JO - Nature Materials
JF - Nature Materials
SN - 1476-1122
IS - 9
ER -