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Enhancing the stability and redispersibility of o/w Pickering emulsion through polyacryloyl hydrazide-tannic acid synergy

Narukulla, Ramesh, Ojha, Umaprasana, Sharma, Tushar
Colloids and surfaces 2019 v.568 pp. 204-215
colloids, droplet size, emulsifying properties, emulsions, hydrazides, industrial applications, lipid content, nanoparticles, oils, powders, tannins
Stable and redispersible oil powders with minimal solid contents are important for a range of applications. In this contribution, the role of tannic acid (TA) towards stability, re-dispersibility of polyacryloyl hydrazide (PAHz)-Ag nanoparticle (NP) based Pickering emulsions is accessed. Presence of TA (200 μmol/L) in a fairly small amount, reduced the PAHz concentration from 25 wt% to 3 wt% and decreased the droplet size from 6.25 to 2 μm and enhanced the emulsion stability from 30 to 35 days while producing stable oil powders and maintaining the re-dispersion efficiency. The oil powders retained up to ˜97% of initial oil content and the re-dispersion occurred by simply handshaking the oil powders in water. The study revealed that, both TA and PAHz-Ag NP synergistically acted to stabilize the emulsion as well as the resulting oil powders. The total solid content notably decreased from 250 mg/ml to ˜30 mg/ml in presence of TA, while improving the emulsion properties. These new Pickering emulsions with substantially low solid content may is anticipated to be environmental friendly find applications in various cosmetic, pharmaceutical and other industrial applications.