Types of Materials We Study

Applications of Interest to Us

Self-Assemblies of Amphiphiles

Our primary area of expertise is in the self-assembly of surfactant and lipid molecules, in water or organic solvents. Self-assembly refers to the spontaneous organization of the molecules into nanoscale structures such as spherical or wormlike micelles (long, flexible chains), vesicles and liposomes (container structures), helical tubules and gel networks. The ability to tune self-assembly using external stimuli such as light, pH or temperature is of particular interest.

Polymers & Biopolymers

Polymers and biopolymers are integral components of our research. We are studying the self-assembly of amphiphilic polymers in conjunction with biological cells. Polymer hydrogels (networks of chains swollen with solvent) and capsules are being synthesized at both micro and nano scales using bulk or microfluidic methods. We often combine polymeric materials with nanoparticles to form nanocomposites that can have unique properties.

Colloids & Nanoparticles

A range of micro- and nano-sized particles are used in our studies. Nanoplatelets or nanodiscs of clay, as well as carbon nanotubes and nanofibers are used to make polymer nanocomposites. Nanoparticles are being synthesized by templating or self-assembly methods and their surfaces are being tailored to include biological ligands. Assembly of particles into larger-scale structures under the guidance of external stimuli such as light or magnetic fields is also being studied.

Drug Delivery, Nanomedicine, Sensors

We are developing pH, light, or temperature-responsive "smart" gels, capsules, and self-assemblies for the controlled and triggered delivery of drugs, proteins, or cosmetics. Nanoparticles are being developed for use in MRI-imaging of cancer tumors. Thermogelling or photogelling "smart" fluids are under investigation for use in fire-fighting and in microfluidic sensors and valves. Superabsorbent hydrogels are being employed as temperature sensors. Vesicle-coated polymers are being studied as "smart" surfaces for biological assays.

Biomaterials, Biomimetic Systems

In conjunction with Remedium Technologies, we are developing a new class of hemostatic bandages and sprays, i.e., materials that can rapidly stop the loss of blood from severe wounds. Vesicle-bearing polymer films are being studied as advanced dressings for treating chronic wounds. Composites of amphiphilic polymers and carbon particles are being evaluated as bio-adhesives and lubricants. We are also using microfluidics to construct biomimetic soft robots, resembling an earthworm, that can be actuated by an external magnetic field.

Materials for Oil Recovery, Energy Storage

Viscoelastic fluids based on wormlike micelles are being designed for use in hydraulic fracturing operations, a key step in tertiary oil recovery. Phase-selective gelators of oil are being developed, and these are likely to find application in the clean-up of oil spills and in the reclamation of the oil. We are also interested in materials for energy-related applications, including advanced electrolytes and electrodes for use in rechargeable lithium-ion batteries.

Experimental Techniques that We Use Frequently