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Mechanical Property of Lipid-Coated Polyelectrolyte Microcapsules

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The deformations of lipid coated polyelectrolyte capsules induced by osmotic pressure were determined in poly(styrene sulfonate, sodium salt) (PSS) solution by making use of the fact that PSS molecules with a molecular weight 70 000 will not penetrate into the capsules. At a critical osmotic pressure the initial spherical capsules changed their shape and became an invagination. The measurements of single particle light scattering provided the wall thickness of the lipid-coated capsules with 25.6 nm while the thickness for pure polyelectrolyte capsules in solution is about 21.6 nm, indicating that the coating lipid layer has about 4 nm thickness. It demonstrates that DMPA forms a bilayer on the surface of polyelectrolyte capsules. With these data, that the elasticity coefficient of the lipid-coated capsules is about 426 Mpa can be obtained.
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Keywords: CAPSULES; DEFORMATION; OSMOTIC PRESSURE; PHOSPHOLIPID; POLYELECTROLYTE

Document Type: Research Article

Publication date: 2006-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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