A magnetically responsive Janus (Janus-M) particle was designed and synthesized by sequential adsorption of hydrophobic ethyl cellulose (EC) and hydrophilic carboxymethyl cellulose (CMC) on a magnetic iron oxide nano particle. A Quartz Crystal Microbalance with Dissipation (QCM-D) instrument was used to evaluate and quantify the adsorption of EC and CMC on the iron oxide surfaces. The adsorption of EC and CMC on magnetic nanoparticles was confirmed by zeta potential measurement, thermal gravity analysis (TGA) and Fourier-transform infrared spectroscopy (FTIR). Field Emission Scanning Electron Microscopy (FE-SEM) images revealed a good dispersion of Janus-M particles in both aqueous phase and organic phase. The coalescence time measurement and the crumpling behavior of particles-stabilized droplets along with the measurements of interfacial pressure-area isotherms demonstrated stronger interfacial activities of Janus-M particles and a stiffer interface adsorbed with Janus-M particles as compared with the interfaces stabilized by conventional interfacially active particles of uniform surface properties. The Janus-M particles were shown to be capable of stabilizing multiple oil-in-water emulsions while the microscopy images confirmed successful stabilization of emulsion droplets tagged by Janus-M particles. The magnetically responsive Pickering emulsions stabilized by Janus-M particles have potential applications in food science, drug delivery, biomedical technology, synthesis of functional nanomaterials, oil removal in environmental technology and oil production in petroleum industry.

Synthesis of magnetically responsive Janus particles using biodegradable natural chemicals for functional magnetic emulsions

2019 Spring National Meeting

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