The effects of polymer concentration and a pore-forming agent (PVP) on HEMA-MMA microcapsule structure and permeability
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Development of high reusability trifunctional polyethersulfones microspheres for the removal of methyl orange
2023, Journal of Water Process EngineeringCitation Excerpt :Therefore, there was negligible difference in the removal of MO between microspheres synthesized with 10 and 15 wt% PES polymer. Higher PES polymer concentration is usually not recommended for the synthesis of microspheres [43]. Besides being difficult to handle due to high viscosity, high concentration of PES polymer might also lead to the dissipation of positive surface charge on PDDA/Fe3O4 NPs through charge migration [44].
Fabrication of zeolite NaX-doped electrospun porous fiber membrane for simultaneous ammonium recovery and organic carbon enrichment
2020, Journal of Membrane ScienceCitation Excerpt :To fabricate a stable membrane and further improve the contact efficiency between ammonium and zeolite NaX active sites, the second strategy (Fig. 1, method 2) was attempted to introduce pores on Z-PEFM by dissolving PVP. PVP as one of the most commonly used pore-forming agents can efficiently enhance the mass transfer process [36,37]. By dissolving PVP, the surface of zeolites previously occupied by PVP may be exposed, although the PVDF components on the doped zeolites of Z-EPFM cannot be removed during post-processing.
Gradual PVP leaching from PVDF/PVP blend membranes and its effects on membrane fouling in membrane bioreactors
2019, Separation and Purification TechnologyCitation Excerpt :When additives (such as water, polyethylene glycol, salts, polyvinylpyrrolidone (PVP), etc.) are used, they steer the phase inversion mechanism towards instantaneous demixing and thus result in a more porous membrane structure [7]. PVP is one of the most used additives for membrane fabrication via phase inversion, and is commonly reported as a good pore forming agent [8]. In addition, its presence also increases the viscosity of the casting solution, thus improves commonly applied casting conditions [9].
Study on preparation of β-cyclodextrin encapsulation tea extract
2011, International Journal of Biological MacromoleculesCitation Excerpt :Microcapsules have found numerous applications in various fields, such as pharmaceutical, chemical, textile, biomedical, environmental, petroleum and pesticide industries [6–8]. Common techniques for fabricating hollow microcapsules with dense or porous membranes include interfacial polymerization, in situ polymerization, and interfacial precipitation [6–16]. Tea is the most widely consumed beverage in the world, and its polyphenolic compounds have been found to possess widespread biologic functions and health benefits [17].
Liquid-liquid two-phase systems for the production of porous hydrogels and hydrogel microspheres for biomedical applications: A tutorial review
2011, Acta BiomaterialiaCitation Excerpt :Red blood cells were encapsulated in the large microcapsules by co-extrusion in a coaxial geometry. The walls of the microcapsules generally had smooth-surfaced skins with finger-like macrovoids within the walls (Fig. 15) [212,213]. Such structures are typical in membranes formed by immersion precipitation.
A microfluidic approach to fabricate monodisperse hollow or porous poly(HEMA-MMA) microspheres using single emulsions as templates
2009, Journal of Colloid and Interface Science