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Title

Modulating size and surface charge of ethylcellulose nanoparticles through the use of cationic nano-emulsion templates

AuthorsCalderó, Gabriela ; Leitner, S.; García-Celma, María José; Solans, Conxita
KeywordsAlkylamidoammonium
PIC Method
Cationic nanoparticles
Ethylcellulose
Nano-emulsion
zeta potential
Issue Date1-Dec-2019
PublisherElsevier
CitationCarbohydrate Polymers 115201 (2019)
AbstractEthylcellulose nano-emulsions have been obtained by the low-energy phase inversion composition method in the Water / [Alkylamidoammonium: Cremophor WO7] / [6% ethylcellulose in ethyl acetate] system at 25 °C. It is shown that nano-emlulsions’ composition variables (oil-to-surfactant ratio, cationic: nonionic surfactant ratio and polymer and water content) produce changes in their droplet diameter, surface charge and colloidal stability following defined trends. Nano-emulsions with good stability, droplet diameters between about 120 and 200 nm and surface charge from about 10 to 50 mV have been obtained. Nano-emulsions are further used as templates for nanoparticle dispersions preparation, which show sizes and surface charges typically smaller and similar respectively to their nano-emulsion templates. Cationic: nonionic surfactant ratio has the highest influence on both, size and surface charge, followed by oil-to-surfactant ratio and water content. Interestingly, the positive charge of the nanoparticles can be depleted under diluting conditions in a time-dependent manner. © 2019 Elsevier Ltd
Publisher version (URL)https://doi.org/10.1016/j.carbpol.2019.115201
URIhttp://hdl.handle.net/10261/192456
DOIhttp://dx.doi.org/10.1016/j.carbpol.2019.115201
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