60th Annual Report on Research 2015

In another experiment, silica-polymer micropraticles wre synthesized using anionic silica nanoparticlea and cationic polymer PEI( polyethylenemine). Their ability to improve the oxidative barrier properties of oil-in-water emulsion was investigated using previously established protocols. It was found that consistent with Si-SI microparticles and Si-polylysine microparticles that we explored previously, Si-PEI microparticles also significantly improved the oxidative barrier properties of the emulsion compared to the emulsion stabilized by silica nanoparticles alone. We observed that this this effect was largely due to thicker interface rendered by larger size of Si-PEI aggregates and the ability of PEI to quench the free radicals before they permeate into the oil phase.

Preliminary experiments were performed to investigate the ability of silica microparticles and silica-polymer microparticles to improve the oxidative barrier properties of dodecane in water, model emulsion. However, the results were incolnclusive.