BS Textiles, Virginia Tech, 1973
PhD Chemistry, Virginia Tech, 1981
Post-doctoral Fellow, Department of Chemistry, Virginia Tech, 1981-1982

Research Scientist, Union Carbide Corp., 1982-1983
Manager, Materials Division, Thoratec Laboratories, 1983-1985
V.P., Research and Development, Thoratec Laboratories, 1985-1987
Research Scientist and Visiting Assistant Professor, Department of Chemistry, Virginia Tech, 1987-1988
Assistant Professor of Chemistry, Virginia Tech, 1988 - 1994
Associate Professor of Chemistry, Virginia Tech, 1994 - 2000
Professor of Chemistry, Virginia Tech, 2000 - present
Director, Macromolecular Science and Engineering Education, Virginia Tech, 2000 - present

Honors and Awards:
NSF Division of Materials Research Creativity Award, NSF, 2007
Schug Award for Research Excellence, Virginia Tech Chemistry, 2009
Fellow of the Polymeric Materials Division of the ACS, 2009
Fellow of the American Chemical Society, 2010
Virginia Tech College of Science Diversity Award, 2010

Dr. Riffle currently mentors a research group comprised of 12 Ph.D. students and 2 undergraduates. Of these, 9 are women and 4 are underrepresented minority students. Their focus is on the synthesis of functionalized homopolymers and block copolymers and their activity in metal complexation and particle formation; and in understanding structure-property relationships in thermoset copolymer networks.

1. S. Das, J. D. Goff, S. Williams, D. Salas-de la Cruz, J. S. Riffle, T. E. Long, K. I. Winey and G. L. Wilkes, Synthesis and Characterization of Novel Segmented Polyionenes Based on Polydimethylsiloxane Soft Segments, Journal of Macromolecular Science, 47(3), 215- 224 (2010).
2. A. Ranjan, N. Pothayee, M. Seleem, N. Jain, N. Sriranganathan, J. S. Riffle and R. Kasimanickam, Drug delivery using novel nanoplexes against a Salmonella mouse infection model, Journal of Nanoparticle Research, 12, 905-914 (2010).
3. Beth L. Caba, Qian Zhang, Matthew R. J. Carroll, Robert C. Woodward, Timothy G. St. Pierre, Elliot P. Gilbert, J. S. Riffle and Richey M. Davis, Nanostructure of PEO- polyurethane-PEO triblock copolymer micelles in water, Journal of Colloid and Interface Science, 344(1), 81-89 (2010).
4. W. C. Miles, J. D. Goff, P. P. Huffstetler, O. T. Mefford, J. S. Riffle, R. M. Davis, The Design of Well-defined PDMS-Magnetite Complexes, Polymer, 51, 482-491 (2010).
5. A. Ranjan, N. Pothayee, M. N. Seleem, R. D. Tyler, Jr., B. Brenseke, N. Sriranganathan, J. S. Riffle, R. Kasimanickam, Antibacterial efficacy of core-shell nanostructures encapsulating gentamicin against an in vivo intracellular Salmonella model, International Journal of Nanomedicine, 4, 289-297 (2009).
6. W. C. Miles, J. D. Goff, P. P. Huffstetler, C. M. Reinholz, N. Pothayee, B. L. Caba, J. S. Boyd, R. M. Davis and J. S. Riffle, Synthesis and Colloidal Properties of Polyether- Magnetite Complexes in Water and Phosphate Buffered Saline, Langmuir, 25(2), 803-813 (2009).
7. M. Seleem, N. Jain, N. Pothayee, A. Ranjan, J. S. Riffle and N. Sriranganathan, Targeting Brucella melitensis with polymeric nanoparticles containing streptomycin and doxycycline, FEMS Microbiology Letters, 294(1), 24-31 (2009).
8. A. Ranjan, N. Pothayee, M. N. Seleem, N. Sriranganathan, R. Kasimanickam, M. Makris, J. S. Riffle, In-vitro trafficking and efficacy of core-shell nanostructures for treating intracellular Salmonella Infections, Antimicrobial Agents and Chemotherapy, 53(9), 3985- 3988 (2009).
9. U. O. Häfeli, J. S. Riffle, L. Harris, A. Carmichael-Baranauskas, F. Mark, J. P. Dailey, D. Bardenstein, Cell Uptake and In Vitro Toxicity of Magnetic Nanoparticles Suitable for Drug Delivery, Molecular Pharmaceutics, 6(5), 1417-1428 (2009).
10. J. D. Goff, P. P. Huffstetler, W. C. Miles, N. Pothayee, C. M. Reinholz, S. Ball, R. M. Davis, J. S. Riffle, Novel Phosphonate-functional Poly(ethylene oxide)-Magnetite Nanoparticles form Stable Colloidal Dispersions in Phosphate Buffered Saline, Chemistry of Materials, 21, 4784-4795 (2009).