Below is a summary of current research topics in Chemical Engineering.
See also my
Prior Research in Applied Mathematics.
I. Electrochemical Energy Systems
Non-equilibrium thermodynamics of lithium intercalation in
composite porous electrodes, phase separation dynamics in LiFePO4 nanoparticles,
mosaic instability and
macroscopic phase transformations in porous electrodes,
elastic coherency strain effects on Faradaic reactions, impedance spectroscopy,
double layer effects,
capacity fade, accelerated aging, and lifetime statistics.
See also the Battery Modeling Group at MIT (an NSF-sponsored Focused Research Group).
Nonlinear dynamics of capacitive charging and Faradaic reactions in porous electrodes, impedance, cyclic voltammetry,
double-layer structure and reactions in room temperature ionic liquids and molten salts,
application to energy storage in electric double layer supercapacitors
and hybrid "pseudocapacitors" (which also include Faradaic reactions).
Double layer effects, impedance, transients, transport phenomena in
fuel cells. In the lab, we are building novel microfluidic fuel cells
to enable high power-density elelectrochemical reactions. We are also working onthe fundamental theory of solid oxide fuel cells,
supported by Saint Gobain Ceramics and Plastics.
II. Electrochemical Microfluidics
Over-limiting current to membranes and electrodes,
(sharp, propagating salt concentration gradients)
in microstructures, concentration polarization
and electro-osmotic convection
in micro/nanochannels and in micro/nanoporous media, homogenization (volume averaging) for ion transport in microstructures,
applications to water purification and desalination by "shock electrodialysis". This work involves both theory and experiments
and is supported by
Weatherford International, through the MIT Energy Initiative.
Nonlinear dynamics of capacitive desalination and selective
ion adsorption by porous electrodes, transport phenomena, effects of Faradaic reactions.
Fundamental theory of "ICEO" at large voltages, microfluidic applications,
AC electro-osmotic micropumps and mixers,
induced-charge electrophoresis and electrodiffusiophoresis of polarizable particles, ICEO flows around biological membranes.
See also Nonlinear Electrokinetics @ MIT
We are developing "membraneless" microfluidic flow batteries exploiting halogen electrochemistry to achieve high power density (W/cm2) and reduce costs. (Collaboration with Cullen Buie.)
- Sorption/desorption hysteresis in nanoporous media (e.g. hydration of cement paste)
. This work is supported by the MIT Concrete Sustainability Hub
- Tensorial slip, transverse flow, and electrokinetics of textured, superhydrophobic surfaces.
- Breakdown phenomena, statistics of structural failure and dielectric breakdown
- Electrochemical dynamics of pulse propation in nerve cells
- Dynamics of receding glaciers
- Applications of conformal mapping
- Random walks, Central Limit Theorem