Klingenberg, Daniel J.

"Magnetorheology: Applications and Challenges," invited article, AIChE J., 47, 246-249 (2001).
"Surface Forces and Friction Between Cellulose Surfaces in Aqueous Media", (with S. Zauscher), Nordic Pulp and Paper Research Journal, in press, 2001.
"Magnetorheology and Magnetostriction of Isolated Chains of Nonlinearly Magnetizable Spheres," (with Y. M. Shkel), J. Rheol., 45, 351-368 (2001).
"Friction Between Cellulose Surfaces Measured with Colloidal Probe Microscopy," (with S. Zauscher), Coll. Surf. A, 178, 213-229 (2001).
"Normal Forces Between Cellulose Surfaces Measured With Colloidal Probe Microscopy," (with S. Zauscher), J. Coll. Int. Sci., 229, 497-510 (2000).
"Simulation of Fiber Flocculation: Effects of Fiber Properties and Interfiber Friction," (with C. F. Schmid and L. H. Switzer), J. Rheol., 44, 781-809 (2000).
"Properties of Fiber Flocs with Frictional and Attractive Interfiber Forces," (with C. F. Schmid), J. Coll. Int. Sci., 226, 136-144 (2000).
"Mechanical Flocculation in Flowing Fiber Suspensions," (with C. F. Schmid), Phys. Rev. Lett., 84, 290-293 (2000).
"Pulp Extrusion at Ultra-high Consistencies: a New Processing Method for Recycling Wastepapers and Papermill Sludges," (with S. Zauscher, C. T. Scott, and J. L. Willet), TAPPI J., 83, 62 (2000).
"Magnetorheology in Viscoplastic Media," (with P. J. Rankin and A. T. Horvath), Rheol. Acta, 38, 471-477 (1999).
"A Continuum Approach to Electrorheology," (with Y. M. Shkel), J. Rheol., 43, 1307-1322 (1999).
"Model of a Magnetizable Elastic Material," (with V. A. Naletova , V. A. Turkov and Y. M. Shkel), J. Magnetism and Magnetic Mat., 202(2-3), 570-573 (1999).
"Large Amplitude Oscillatory Shear of Electrorheological Suspensions," (with M. Parthasarathy), J. Non-Newt. Fluid Mech., 81 83-104 (1999).
"Electro-and Magneto-rheology," (with P.J. Rankin and J.M. Ginder), invited article, Curr. Opin. Coll. Int. Sci., 4 373-381 (1998).
"Simulation of Flowing Wood Fiber Suspensions," (with R.F. Ross), J. Pulp and Paper Sci., 24 388-392 (1998).
"Electrostriction of Polarizable Media: Comparison of Models with Experimental Data," (with Y.M. Shkel), J. Appl. Phys., 83 7834-7843 (1998).
"Simulation of Single Fiber Dynamics," (with P. Skjetne and R.F. Ross), J. Chem. Phys., 107 2108-2121 (1997).
"Electrorheology: Mechanisms and Models," (with M. Parthasarathy), Mat. Sci. Eng. R, invited review paper, R17 57-103 (1996).

Selected Awards, Honors and Societies

Polygon Outstanding Instructor Award (1993)
NSF CAREER Award (1995)

Summary

Our research concentrates on understanding the fundamental chemistry and physics of transport processes of heterogeneous media, particularly the role of colloidal and interfacial properties on the mechanical and rheological properties of materials. Applications of this area of research are quite broad, ranging from synthesizing new materials to understanding diseases in the human body. Many new and interesting systems suffer from a lack of fundamental understanding and experimental data, inhibiting development and applications. Our research program contains both an experimental effort and the analytical work required to fully understand the controlling factors. Our ultimate goal is to understand the underlying chemistry and physics in order to improve processes and material properties. Examples of our research projects follow.

Fiber Suspension Rheology: The behavior of fiber suspensions is important to many industrial processes, from papermaking to processing reinforced composites. Our approach focuses on understanding the relationships between fiber properties and interactions, suspension structure and rheological properties of non-Brownian fiber suspensions. We combine experiments probing the microstructure and rheology, "molecular" simulation techniques, and theoretical development to probe the above relationships. Particular problems that we address include the role of fiber flexibility and concentration on the entanglement and flocculation of fibers, the rheological response of entangled networks, and the evolution of anisotropy in these suspensions.

Electrorheological Suspensions: The electrorheological (ER) response is the dramatic variation in suspension rheological properties due to large applied electric fields. Development of proposed applications, including ER clutches, brakes, engine mounts and robotic actuators, is currently limited by a lack of understanding of the underlying mechanisms and by the inability to produce effective, stable suspensions. Our research addresses each of these issues.

We investigate the dynamic response and its relationship with suspension structure, and probe the role of surfactants in enhancing ER activity. Results from this work will have a direct impact on current and future application development.

Electrostrictive Polymeric Films: The ability of thin polymer films to change their volume or shape in electric fields has many applications in transducers, sensors and actuators. However, very little is known about the mechanisms that produce this electrostrictive behavior. As a result, design and optimization of materials and devices is limited. Our research focuses on understanding the fundamental mechanisms that produce electrostriction in polymer films, and on determining the properties that can be controlled to optimize material responses and applications.

Copyright 2009 The Board of Regents of the University of Wisconsin System
Date last modified: 28-Jan-2009
Content by: klingen@engr.wisc.edu
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