Chemistry Temporary Faculty
Education
B.S. Chemical Engineering, M.I.T. (1965)
Ph.D. Chemical Engineering & Materials Science, Rensselaer Polytechnic Institute (1971)
Visiting Scholar, U. of Michigan (1977)
Contact Information
344 Dow Hall, Dept. Chemistry
Phone: (989) 774-3268
e-mail:falen1jr@ cmich.edu
Research Fields
Rheology of Electroviscous fluids consisting of dendrimer suspensions
Current Research Projects
We have investigated suspensions of amine functional dendrimers on the surface of silica suspended in silicone oil. We have noted a surprisingly strong correlation of the electrorheological effect with the level of maximum stress during oscillatory dynamic mechanical measurements. This is consistent with a picture where polar or polarizable particles line up in an electric field. The drive toward alignment must overpower the Brownian motion and/or mechanical perturbation. Dielectric properties of the suspended particles will favor alignment – but the resistivity of the suspended particles must be high enough to avoid excessive current flow.
Selected Publications
G. Li, S. Hirschi, L. Rakesh, J. Falender, North American Thermal Analysis Society, Williamsburg, VA; Oct., 2004, “Electrorheology of Surface Modified Micro and Nano Particles In Silicone Oil.”
G. Li, S. Hirschi, L. Rakesh, J. Falender, Proc. ASME International Mechanical Engineering Congress and Expo, 13-19 Nov., 2004, Anaheim, CA, “Electrorheology of Micro and Nano Suspensions.”
G. Li, S. Hirschi, L. Rakesh, J. Falender, 79Th American Chemical Society Colloid and Surface Science Symposium, June 12, 2005, Potsdam, NY., “Rheological Behavior of Nano-Dendrimers/Silica Suspensions.”
J. Falender, S. Hirschi, L. Rakesh, G. Li, The Fourth International Dendrimer Symposium, Mount Pleasant, MI, May 18, 2005, “Structure-Property Relationships In Electrorheological Experiments Involving Suspensions of Dendrimers and Silica In Silicone Oil.”
Figure below: Inside Rheology Laboratory
