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Department of Radiology Imaging Sciences Grand Rounds Lecture

Department of Radiology Imaging Sciences Grand Rounds Lecture. “Using a Confocal Rheoscope to Image the Mechanical Properties of Soft Squishy Tissues”. Itai Cohen, Ph.D. Associate Professor, Department of Physics Cornell University.

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Department of Radiology Imaging Sciences Grand Rounds Lecture

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  1. Department of Radiology Imaging Sciences Grand Rounds Lecture “Using a Confocal Rheoscope to Image the Mechanical Properties of Soft Squishy Tissues” Itai Cohen, Ph.D. Associate Professor, Department of Physics Cornell University • Dr. Itai Cohen did his graduate and postdoctoral work in the labs of Professors Sidney Nagel (Chicago) and David Weitz (Harvard), respectively. He studies how incorporating structure into fluids at various length scales affects their macroscopic flow properties. The systems studied include Newtonian fluids, liquid crystals, colloidal suspensions, insect wings, and bio-polymer networks. Prof. Cohen has developed a novel confocal rheometer which simultaneously images the 3-D structure of a fluorescent material such as a colloidal suspension or biopolymer network while measuring the amount of force necessary to shear the material. In this way, the link between material structure at the micron scale and the material properties at the macroscopic scale can be investigated quantitatively. • Prof. Cohen’s lab is focusing on four areas at the forefront of this broad field: • Colloidal suspensions – where microscopic and nanoscopic particles or sheets are suspended in a fluid. • Bio-polymer networks – where the properties of natural and artificial tissues comprised of cross-linked polymer networks are investigated. • Fluid-fluid and fluid-membrane interfaces – where fluid flows interact with an interface or flexible membrane. The air flows induced by insect wings are an example of such an interaction. • Liquid-crystals – where the fluid molecules themselves have structure. • Learning the design principles on each of these length scales will lead to fabrication of hybrid materials sensitive to combinations of stimuli and flow configurations. These novel materials will be used to engineer the next generation of products ranging from car seat cushions to lubricants to biological implants. Friday, August 10, 2012 12:00 to 1:00 pm Health Sciences Building, Turner Auditorium, D209 For more information, contact Laura Grant at grantl2@u.washington.edu. To request disability accommodations, contact the Disability Services offices at (206) 543-6452 or dso@u.washington.edu.

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