Polymer Phase Separation in a Microcapsule Shell
Autor: | David A. Weitz, Weichao Shi |
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Rok vydání: | 2017 |
Předmět: |
Materials science
Polymers and Plastics Nuclear Theory Shell (structure) Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Physics::Fluid Dynamics Inorganic Chemistry Physics::Atomic and Molecular Clusters Materials Chemistry Osmotic pressure Janus Microscale chemistry chemistry.chemical_classification Component (thermodynamics) Organic Chemistry Polymer 021001 nanoscience & nanotechnology Biodegradable polymer 0104 chemical sciences Condensed Matter::Soft Condensed Matter chemistry Chemical engineering Mechanical stability 0210 nano-technology |
Zdroj: | Macromolecules. 50:7681-7686 |
ISSN: | 1520-5835 0024-9297 |
Popis: | Phase separation has been used for engineering microscale fluids and particles with designed structures. But it is challenging to use phase separation to create complicated microcapsules because phase separation in the shell correlates with applied osmotic pressure and affects capsule stability significantly. Here we employ two biodegradable polymers to study the phase separation in microcapsule shells and its effect on the mechanical stability. The dynamic process reveals that phase separation creates a patchy shell with distinct regions transiently, then transports the discrete domains across the shell, and coalesces them at the surface. The equilibrium structure with balanced osmotic pressure is a Janus shell, where one component forms the shell and the other component dewets on the surface. Under slight osmotic pressure to the shell, phase separation reaches a different Janus shape, which consists of two partial shells of each component. We can in further take advantage of phase separation and osmotic... |
Databáze: | OpenAIRE |
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