MECHANICAL PROPERTIES, SPECIFIC RELEASE, AND MOTILITY OF PATCHY colloidosomes - AN EMERGING CLASS OF STRUCTURES.
Within the project, I will study patchy colloidal capsules initially made on a surface of liquid droplets. The investigation will concern the mechanical properties; specific direction and targeted release of encapsulated species; and the motility of such heterogeneous colloidal capsules (patchy colloidosomes). The main objectives of this project proposal are: to further develop fabrication methods of patchy colloidosomes and hybrid patchy colloidal capsules on the bases of my recent pioneering work in this field; to understand the mechanism of complex deformation of patchy colloidal capsules; to develop routes for specific and targeted release of encapsulated species from patchy colloidosomes; and research on the guided-motion, self-propulsion and collective behaviour of patchy colloidosomes.
MECHANICAL PROPERTIES AND INSTABILITY OF PICKERING FILMS AND EMULSIONS.
This is a research project in experimental soft matter physics focused on understanding the mechanics and rheology of monolayered colloidal capsules and instabilities of Pickering droplets probed by electrically induced stress. Within the project, we study colloidal capsules (composed of jammed particles) made on a surface of oil droplets. The investigation concerns the viscoelastic deformation, crumbling, rotation or tank-treading of a single capsule due to applied external E-fields. We also monitor changes of mechanical properties of droplets as the Pickering emulsion is being produced. This work is conducted in collaboration with the group at NTNU, Trondheim.
A NEW APPROACH TO FABRICATING VARIOUS COLLOIDAL SHELLS AND PICKERING EMULSIONS.
This project focuses on new methods of fabrication of Colloidosomes/Janus/Patchy/Arrested shells. We also produce an active colloidal armor, i.e. a pupil-like shell that contracts and expands in presence of E-fields. We study silicone oil droplets, containing different particles (including clay, PE. PS or conductive beads), that are submerged in immiscible organic oil, and we observe particle movement, oil circulation and drop deformation when an electric field is applied. Results show how electric field strength, electrohydrodynamics, dielectric and conductive properties determine the fluid flow, particle organization and drop deformation. Adsorption and assembly of colloidal particles at the surface of liquid droplets is the basis for particle-stabilized Pickering emulsions and colloidosome capsules.
SORPTION AND MIGRATION OF CO2 IN POROUS MEDIA
The project is a collaboration within the COMPLEX-network ("www.complexphysics.org"), and involves experimental studies as well as numerical studies focused on the behavior of CO2 in general porous materials, and near surfaces made out of clays. At NTNU the project involves synchrotron X-ray scattering techniques (WAXS/SAXS) and rheometry, at IFE we use neutron scattering techniques (SANS), and at UiO we study the flow of CO2 in model porous media. The project is relevant both for capturing and storage of CO2. In particular it is important to understand the interactions between clay particles, and CO2 in the context of CO2 storage in underground reservoirs, since the cap-rock in such systems contains large amounts of clays, i.e. the project will work on understanding CO2 near and inside material from the nano scientific point of view, and then focus on how to upscale the nanophysics, to the macrophysics scale.
SELF ASSEMBLY FROM SELECTED PARTICLES IN SUSPENSION
The research involves studies of general physical processes and phenomena in electrorheological (ER) and magnetorheological (MR) systems by means of experimental methods such as x-ray scattering (WAXS/SAXS), atomic force microscopy (AFM), scanning electron microscopy (SEM), rheometry, etc. In addition to working with these techniques at laboratories at NTNU, experiments are scheduled to be performed at X-ray synchrotron sources, and in collaboration with, foreign laboratories and research groups: France "(ESRF)", Sweden "(MAX-LAB)", Brazil "(LNLS)", South-Korea "(PLS)" and other countries.