Journal
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
Volume 47, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colcom.2022.100592
Keywords
Poly acrylic acid; Polyelectrolyte; Nanoemulsion; Magnetic chaining technique; Colloidal force; Inter-droplet force
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The inter-droplet force and conformational changes of stabilizing moieties in poly acrylic acid (PAA) stabilized magnetic nanoemulsions are investigated using magnetic chaining technique. The results show that the inter-droplet spacing increases with higher PAA concentration and decreases with time.
Emulsions are stabilized with surfactants, polymers, or polyelectrolytes to extend their shelf-life and colloidal stability. Electro-steric interaction in polyelectrolyte stabilized emulsions makes them ideal systems for probing the conformational dynamics. Here, magnetic chaining technique is exploited for inter-droplet force measure-ment in poly acrylic acid (PAA) stabilized magnetic nanoemulsions, and to probe the conformational changes of the stabilizing moieties as a function of time and PAA concentration. Force measurement studies indicate an increased inter-droplet spacing for higher concentration of PAA due to an increase in osmotic pressure with concentration. Further, for a fixed concentration, the inter-droplet spacing decreases with time due to the slow diffusion of the polymer chains resulting in conformational changes. This is the first experimental report on conformational dynamics of PAA stabilized oil-in-water magnetic nanoemulsions. The obtained results are beneficial for understanding the nature of colloidal interaction forces in polyelectrolyte stabilized nanoemulsions.
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