Nanocapsules templated on liquid cores stabilized by graft amphiphilic polyelectrolytes

Nanoscale
Joanna SzafraniecSzczepan Zapotoczny

Abstract

A surfactant-free method of preparation of nanocapsules templated on liquid cores using amphiphilic graft polyelectrolytes was developed. A model photoactive copolymer, poly(sodium 2-acrylamido-2-methyl-1-propanesulfonate) with grafted poly(vinylnaphthalene) chains (PAMPS-graft-PVN) was used to stabilize toluene droplets in an aqueous emulsion. The macromolecules, due to their amphiphilic character and the presence of strong ionic groups, tend to undergo intramolecular aggregation in water but at the water-oil interface less compact conformation is preferred with PVN grafts anchoring in the oil phase and the charged PAMPS main chains residing in the aqueous phase, thus stabilizing the nanoemulsion droplets. Formation of such nanocapsules was confirmed by dynamic light scattering measurements as well as SEM and cryo-TEM imaging. Grafting density and content of the chromophores in the graft copolymers were varied in order to achieve high stability of the coated nanodroplets. It was shown that the capsules are better stabilized by the copolymers with many short hydrophobic grafts than with fewer but longer ones. Use of photoactive polyelectrolytes enabled spectroscopic investigation of the relationship between conformation of the ...Continue Reading

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Citations

Sep 6, 2020·Polymers·Joanna Szafraniec-SzczęsnySzczepan Zapotoczny
Dec 29, 2020·ACS Applied Materials & Interfaces·Karolina Chojnacka-GórkaSzczepan Zapotoczny
Feb 28, 2019·ACS Applied Materials & Interfaces·Joanna OdrobińskaSzczepan Zapotoczny
Nov 5, 2021·Macromolecular Bioscience·Chengbin YangChih-Kuang Chen

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