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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 28371.0, MPI für Polymerforschung / MPI Polymerforschung
Deformation properties of nonadhesive polyelectrolyte microcapsules studied with the atomic force microscope
Authors:Lulevich, V. V.; Radtchenko, I. L.; Sukhorukov, G. B.; Vinogradova, Olga I.
Date of Publication (YYYY-MM-DD):2003-03-27
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Issue / Number:12
Start Page:2735
End Page:2740
Review Status:not specified
Audience:Not Specified
Abstract / Description:We study the deformation of nonadhesive polyelectrolyte microcapsules under applied load using an atomic force microscope (AFM)-related force measuring device. Both "hollow" (water inside) and "filled" (water-polyanion solution inside) microcapsules are explored. The "filled" capsules were found to be much stiffer than "hollow" ones. The load-deformation profiles always included two regimes, characterized by different behavior. In the first regime, with a low applied load, capsule deformation is elastic and reversible. Above a certain load, capsules deform substantially and partly irreversibly. In this regime, the "hollow" capsules show variability in the reversibility, as well as in load - deformation profiles, which include different sectors (from substantial deformation at quasiconstant load to noisy regions). The "filled" capsules do not reveal such variability and become stiffer when the load is increased. After substantial deformation the "hollow" capsules enter a third region, in which major damage is caused by higher load. We show that the dramatic changes of the capsule's mechanical properties after filling with polyelectrolyte reflect a combined effect of excess osmotic pressure inside them, changes in the shell stiffness, and possibly a formation inside capsules of an electrostatically stabilized 3D net structure.
Comment of the Author/Creator:Date: 2003, MAR 27
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Russian Acad Sci, Inst Phys Chem, Lab Phys Chem Modified Surfaces, Moscow 117915, Russia; Max Planck Inst Colloid & Interface Res, D-14424 Potsdam, Germany
Identifiers:ISI:000181717600016 [ID No:1]
ISSN:1520-6106 [ID No:2]
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