Jonathan W. Bender - Physics

More documents

Recommendations

Info

Jonathan W. Bender October, 2001 page 2 of 4 nanometer scale resolution in GaN-based semiconductors. • Developed techniques to selectively etch materials in GaN-based semiconductors using a photoelectrochemical process. • Discovered that GaN oxidizes under the strong electric fields present during STM scanning. Colloidal suspension rheology • Discovered that electric fields suppress the shear thickening of concentrated suspensions. Received NSF GOALI funding for continued study. • Characterized flowing colloidal suspension microstructure using light and neutron scattering to verify statistical mechanical theories of rheological behavior. • Developed a new stress-optical relation between optical dichroism and the thermodynamic shear stress. Paper cited 43 times. • Experimentally verified the microstructural origins of shear thinning and shear thickening in concentrated colloidal suspensions. Paper cited 47 times. Lubricant formulation and tribology • Clearly demonstrated that rampant oxidative wear led to early magnetorheological (MR) fluid failure in aggressive energy dissipation environments. • Investigated metallurgical coatings technologies to provide a high friction, low wear interface for MR fluid magnetic powders. • Investigated/identified mechanisms of silicone fluid polymerization in aggressive shearing environments. • Conceptualized/designed experiments to relate lubricant frictional and viscometric properties to metal belt transmission (CVT) noise, oil retention, wear, and torque transfer. BUSINESS CONTRIBUTIONS Magnetorheological (MR) fluids • Solved MR fluid durability problems using alternative metallurgies, increased the life of one emerging product 10-fold; product generating $300K/year. • Determined commercial feasibility of a MR-controlled clutch in joint effort with major automotive supplier. • Showcased MR technology by designing/developing 5 custom machines to evaluate application feasibility and improve formulations. • Identified best combination of mechanical design/fluid formulation for seal-less MR devices, invented new fluid-retentive matrices. Automotive Transmission Fluids (ATF) • Reformulated additive package for Ford factory-fill transmission fluid, extended transmission durability and eliminated shudder. Exxon won $50 million in business. • Developed new ASTM test for measuring air entrainment in automotive transmission fluids, a common cause of automotive fires, saving Exxon $150,000/year in failed transmission tests. Plant Commissioning • Supervised 50 technicians and operators in the commissioning of 7 new industrial gas and first-of-a-kind ultra-high purity gas plants (~ $750 million in capital); trained operators, verified safe operability. • Operated biological waste-water treatment pilot plants. TEACHING/TRAINING/MENTORING EXPERIENCE • Lectured NCSU undergraduates in Chemical Engineering Thermodynamics (2001) • Lectured NCSU doctoral candidates in basic colloid rheology (1999)
• Mentored 3 recent engineering graduates (1997-2000) • Hired and trained 3 engineering interns (1996-1999) • Designed two rheology projects for grad students (1996-1998) • Managed 4 research technicians (1995-1999) • Teaching Assistant for Statistical Mechanics course (1994) Jonathan W. Bender October, 2001 page 3 of 4 PATENT "Field-induced shear thickening fluids," J.W. Bender, patent submitted 2000 PUBLICATIONS J. W. Bender and J. Krim, “Nanotribology: Experimental Techniques and Applications,” in Encyclopedia of Nanoscience and Nanotechnology, ed. H. Nalwa, in preparation M. Abdelmaksoud, J. W. Bender, J. Krim, “Nanotribology of a vapor-phase lubricant: A quartz crystal microbalance study of tricresylphosphate (TCP) uptake on iron and chrome,” in preparation J. W. Bender and J. Krim, “Applications of the Piezoelectric Quartz Crystal Microbalance to Microdevice Development,” in Micro- and Nano-Scale Diagnostic Techniques, ed. K. Breuer, submitted (2001) J. W. Bender and P. E. Russell, “Combined AFM and STM of cross-sectioned GaN LEDs,” submitted to Scanning (2001) J. W. Bender, S. S. Shenoy, and N. J. Wagner, “Electric field effects on the shear thickening transition of concentrated colloidal suspensions,” submitted to Phys. Rev. Lett. (2001) M. R. Jolly, J. W. Bender, and J. D. Carlson, “Properties and applications of commercial magnetorheological fluids,” J. Intel. Mat. Sys. T. Str. 10(1) 5-13 (1999) M. R. Jolly, J. W. Bender, and R. T. Mathers, “Indirect measurements of microstructure development in magnetorheological fluids,” Int. J. Mod. Phys. B 13(14-16) 2036-2043 (1999) J. W. Bender and N. J. Wagner, “Reversible shear thickening in monodisperse and bidisperse colloidal suspensions,” J. Rheol. 40(5) 899-916 (1996) R. J. Butera, M. S. Wolfe, J. W. Bender, N. J. Wagner, “Formation of a highly ordered colloidal microstructure upon flow cessation from high shear rates,” Phys. Rev. Lett. 77(10) 2117-2120 (1996) J. W. Bender and N. J. Wagner, “Optical measurements of the contribution of colloidal forces to the rheology of concentrated suspensions,” J. Coll. Interf. Sci. 172, 171-184 (1995) J. W. Bender and N. J. Wagner, “Shear thinning properties of dense suspensions: rheology and flow dichroism,” MRS Proceedings 1993 PRESENTATIONS M. Abdelmaksoud, J. W. Bender, and J. Krim, “Nanotribology of a vapor-phase lubricant: A quartz crystal microbalance study of tricresylphosphate (TCP) uptake on iron and chrome,” AIChE Annual Meeting, Reno, NV 2001 J. W. Bender and P. E. Russell, “Combined AFM and STM of cross-sectioned GaN LEDs,” AIChE Annual Meeting, Reno, NV 2001 J. W. Bender, “Insight into mechanical limitations of MR fluid metal particles; a case for hard-casing,” Annual Technology Review, Lord Corporation 1999 J. W. Bender, “Prospects of the use of water atomized iron particles in MR fluid dampers,” Annual Technology Review, Lord Corporation 1998 J. W. Bender and N. J. Wagner, “Reversible shear thickening in monodisperse and bidisperse colloidal suspensions,” 68 th Annual Meeting Society of Rheology, Galveston, TX 1997 J. W. Bender and R. F. Watts, “Technical issues in developing a lubricating fluid for continuously variable
Page 1: Jonathan W. Bender NC State Univers

Jonathan W. Bender - Physics

Create successful ePaper yourself

Delete template?

Save as template?