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Do depletant stabilized water-in-oil microemulsions have implications for nanoencapsulation?
Leggins Abraham, , Moorthi Pichumani
Published in Elsevier B.V.
2019
Volume: 577
   
Pages: 440 - 448
Abstract
The physico-chemical mechanisms associated with surfactant-free depletant stabilized water-in-oil microemulsion based shell encapsulation processes merit detailed investigation owing to the possibility of a direct correlation between encapsulation and the stable water-in-oil microemulsion system. The presence of core nanoparticles is expected to influence the formation of stable water-in-oil microemulsion system wherein polyethylene glycol (PEG) is used as depletant material. The depletant is expected to play a dual role: on one hand, it reduces the surface tension of de-ionized water during the synthesis of core while on the other hand, it helps to form stable water-in-oil microemulsion system (surfactant free) and the subsequent organization of silica coating over magnetite and systematic measurements have implications on nano encapsulation. The water-in-oil microemulsion system stabilized by depletant material is formulated with the presence of core-nanoparticles. The stability of the water-in-oil microemulsion is quantified by measuring the average hydrodynamic diameter. The presence of silica coating on core nanoparticles is robustly demonstrated using (a) small angle X-ray scattering data and Guinier plot analysis, (b) isoelectric point measurement, (c) high-resolution transmission electron microscopy, and (d) infrared spectroscopy. When the concentration of PEG and water-particles mixture (WP mixture) increases, the average hydrodynamic diameter of water-in-oil microemulsion decreases. Multiple magnetite nanoparticles are accommodated within each water droplet, without the occurrence of instability/agglomeration event. This ensures a higher yield via this process. Breakdown of stable water-in-oil microemulsion hinders the shell coating process and this is a first attempt to form the surfactant-free depletant stabilized water-in-oil microemulsion systems. The effects observed in this work have important implications for the development of new approaches to the formation of water-in-oil microemulsion systems and subsequent encapsulation processes. © 2019 Elsevier B.V.
About the journal
JournalData powered by TypesetColloids and Surfaces A: Physicochemical and Engineering Aspects
PublisherData powered by TypesetElsevier B.V.
Open AccessNo
Concepts (35)
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    Coatings
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    Encapsulation
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    High resolution transmission electron microscopy
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    Hydrodynamics
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    Infrared spectroscopy
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    Magnetite
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    Magnetite nanoparticles
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    Mixtures
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    Silica
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    Surface active agents
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    X ray scattering
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    Core shell
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    DEPLETION FORCE
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    ENCAPSULATION PROCESS
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    Hydrodynamic diameter
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    PHYSICO-CHEMICAL MECHANISMS
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    SAXS
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    WATER IN OIL MICROEMULSION SYSTEM
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    Water-in-oil microemulsions
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    Microemulsions
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    Macrogol
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    Magnetite nanoparticle
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    Nanoparticle
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    WATER OIL CREAM
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    Article
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    Controlled study
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    DISPERSION
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    Isoelectric point
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    Microemulsion
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    Nanoencapsulation
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    Physical chemistry
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    Priority journal
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    Surface tension
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    Synthesis
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    X ray diffraction