We generate insights on the dynamics of complex systems through experiments, theoretical analysis, and simulation. Aims of the research include enabling the efficient control and processing of these systems which are used in a wide range of industries, products, and emerging technologies.
Dmitry KopelevichAssociate Professor
OUR RESEARCH FOCUSES ON THEORETICAL & COMPUTATIONAL investigation of transport phenomena and non-equilibrium processes in nano- and microscale systems. We apply various simulation methods, such as molecular and Brownian dynamics, as well as theoretical tools to various systems whose understanding is of significant scientific and technological importance.
SELF-ASSEMBLED SURFACTANT SYSTEMS
Surfactants (or amphiphiles) are molecules that contain both hydrophobic and hydrophilic segments. In aqueous solutions, surfactants spontaneously self-assemble into a variety of microstructures that find use in numerous applications, including drug delivery vehicles and templates for advanced nanostructured materials. In addition to their industrial uses, self-assembled structures of amphiphilic molecules, such as lipid bilayers, are building blocks for various biological systems. In all of these systems, the dynamics of self-assembly and transitions between different self-assembled structures plays an important role. Our goal is to understand molecular mechanisms of these transitions. In particular, we investigate mechanisms of formation and break-up of micelles and dynamics of lipid membranes.
TRANSPORT IN SELF-ASSEMBLED SYSTEMS
The process of mass transfer across surfactant-covered microemulsion interfaces and lipid bilayers plays an important role in numerous applications, including separations, reactions, drug delivery, and detoxification. We investigate the molecular mechanisms of solute transport across an interface composed of tightly packed amphiphilic molecules and assess various factors that affect this transport.
Particle suspensions in liquids have a wide array of applications, ranging from pharmaceutical to oil industries. When suspended particles are sufficiently large, thermal Brownian forces acting on them are negligible. Nevertheless, the particles are observed to undergo diffusive motion, which is qualitatively similar to the Brownian motion. In this project we, in collaboration with Prof. Jason Butler, apply tools of statistical mechanics to investigate fundamental mechanisms of diffusion in such non-Brownian suspensions. In particular, we aim to explain some counterintuitive experimental observations, for example, that increasing particle roughness leads to decrease of their diffusivity.
Ph.D., 2002, University of Notre Dame
Awards & Distinctions
- National Science Foundation CAREER Award
- Ahn, Y. N., Gupta, A., Chauhan, A., and Kopelevich, D. I. “Molecular transport through surfactant-covered oil-water interfaces: Role of physical properties of solutes and surfactants in creating energy barriers for transport”, Langmuir 27 (2011), 2420-2436.
- Gupta, A., Chauhan, A. and Kopelevich, D. I. “Molecular Transport across Fluid Interfaces: Coupling between Solute Dynamics and Interface Fluctuations”, Phys. Rev. E 78 (2008), 041605.
- Chen, C.-Y. and Kopelevich, D.I., “Phonon Interactions in Zeolites Mediated by Anharmonicity and Adsorbed Molecules,” Mol. Simulat., 34 (2008) 155.
- Mohan, G. and Kopelevich, D.I., “A Multi-Scale Model for Kinetics of Formation and Disintegration of Spherical Micelles,” J. Chem. Phys., 128 (2008) 044905.
- May, E.R., Narang, A. and Kopelevich, D.I., “Role of Molecular Tilt in Thermal Fluctuations of Lipid Membranes,” Phys. Rev. E, 76 (2007) 021913.