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Science 1 November 2002:
Vol. 298. no. 5595, pp. 1006 - 1009
DOI: 10.1126/science.1074868
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Reports
Colloidosomes: Selectively Permeable Capsules Composed of Colloidal Particles
A. D. Dinsmore,1*
Ming F. Hsu,1
M. G. Nikolaides,1
Manuel Marquez,2
A. R. Bausch,1*
D. A. Weitz1*
We present an approach to fabricate solid capsules with precise
control of size, permeability, mechanical strength, and compatibility. The capsules are fabricated by the self-assembly of colloidal particles
onto the interface of emulsion droplets. After the particles are locked
together to form elastic shells, the emulsion droplets are transferred
to a fresh continuous-phase fluid that is the same as that inside the
droplets. The resultant structures, which we call "colloidosomes,"
are hollow, elastic shells whose permeability and elasticity can be
precisely controlled. The generality and robustness of these structures
and their potential for cellular immunoisolation are demonstrated by
the use of a variety of solvents, particles, and contents.
1 Department of Physics and DEAS, Harvard
University, Cambridge, MA 02138, USA.
2 Los Alamos
National Laboratory, Chemistry Division, Los Alamos, NM 87545, USA, and
The Nanotechnology Lab, Kraft Foods R&D, 801 Waukegan Road, Glenview,
IL 60025, USA.
*
To whom correspondence should be addressed. E-mail:
dinsmore{at}physics.umass.edu (A.D.D.); abausch{at}ph.atum.de (A.R.B.);
weitz{at}deas.harvard.edu (D.A.W.)
Present address: Department of Physics, University of
Massachusetts, Amherst, MA 01003-4525, USA.
Present address: Lehrstuhl für Biophysik
- E22, Technische Universität München, 85747 Garching,
Germany.
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