Levich Institute Seminar Announcement, 04/29/2014
Tuesday, 04/29/2014
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Joan Brennecke
University of Notre Dame
Department of Chemical and Biomolecular Engineering

"Tuning the Properties of Ionic Liquids and Ionic Liquid Mixtures "

ABSTRACT


Ionic liquids are low melting salts, which have garnered significant attention for a wide variety of applications, including as electrolytes in batteries, supercapacitors, solar cells and fuel cells, as lubricants, as heat transfer fluids, and as solvents for reactions and separations. The choice of cation, anion and substituents dramatically affects the thermodynamic and transport properties of the fluids relevant to the various applications. These properties include melting point, glass transition temperature, decomposition temperature, density, viscosity, thermal conductivity and electrical conductivity. We will explore how these properties can be controlled by design of the ionic liquid and development of a fundamental understanding of the intermolecular interactions. The viscosity and electrical conductivity are of particular interest since in many applications the goal is to reduce the viscosity and increase the conductivity. We make use of the Walden Plot analysis, which examines the equivalent conductivity as a function of the fluidity (inverse viscosity), and sheds light on the apparent ionicity, or degree of dissociation, of the IL. We also focus on mixtures of ionic liquids, especially those the exhibit nonideal thermodynamic behavior and do not follow common mixing rules for viscosities of binary mixtures.

BRIEF ACADEMIC/EMPLOYMENT HISTORY
  • B.S. Chemical Engineering, University of Texas (1984)
  • M.S. University of Illinois (1987)
  • Ph.D. University of Illinois (1989)

RECENT RESEARCH INTERESTS

Joan Brennecke's interests are in the development of environmentally benign solvents and processes. Of particular interest is the use of ionic liquids and carbon dioxide for extractions, separations, and reactions.



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