Joseph Tracy

University Faculty Scholar
Professor

University Faculty Scholar
Professor
  • 919-513-2623
  • Engineering Building I (EB1) 3074D
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Many kinds of nanoscale materials have size- and shape-tunable physical properties arising from their reduced dimensions and high surface area to volume ratio. We prepare colloidal magnetic, metallic, and semiconductor nanoparticles using a “bottom-up” approach starting from molecular precursors. Surface functionalization allows for integration with other kinds of materials, such as polymers and biological systems. Applying magnetic fields to suspensions of magnetic nanoparticles drives their assembly into chains, altering their magnetic and mechanical properties. The surface plasmon resonance of noble metal nanoparticles is sensitive to interparticle coupling and is useful for photothermal heating. Semiconductor quantum dots have high fluorescence quantum yields and are not susceptible to photobleaching.

Dr. Tracy’s research interests include the synthesis, characterization, and self-assembly of colloidal magnetic, metallic, and semiconductor nanoparticles, and their applications in composite materials, medicine, and catalysis.

Education

Ph.D. 2005

Physical Chemistry

Massachusetts Institute of Technology

B.S. 2000

Chemistry

University of California, Santa Barbara

Publications

Plasmon-Coupled Gold Nanoparticles in Stretched Shape-Memory Polymers for Mechanical/Thermal Sensing
Yadav, P. R., Rizvi, M. H., Kuttich, B., Mishra, S. R., Chapman, B. S., Lynch, B. B., … Tracy, J. B. (2021), ACS APPLIED NANO MATERIALS, 4(4), 3911–3921. https://doi.org/10.1021/acsanm.1c00309
Reconfigurable Magnetic Origami Actuators with On-Board Sensing for Guided Assembly
Ha, M., Canon Bermudez, G. S., Liu, J. A.-C., Oliveros Mata, E. S., Evans, B. A., Tracy, J. B., & Makarov, D. (2021), ADVANCED MATERIALS, Vol. 5, p. 2008751. https://doi.org/10.1002/adma.202008751
Sulfidation and selenidation of nickel nanoparticles
Lynch, B. B., Kelliher, A. P., Anderson, B. D., Japit, A., Spencer, M. A., Rizvi, M. H., … Tracy, J. B. (2021), CARBON ENERGY, 10. https://doi.org/10.1002/cey2.83
Flexible Cyclic-Poly(phthalaldehyde)/Poly(epsilon-caprolactone) Blend Fibers with Fast Daylight-Triggered Transience
Li, S., Rizvi, M. H., Lynch, B. B., Tracy, J. B., & Ford, E. (2020), MACROMOLECULAR RAPID COMMUNICATIONS, Vol. 42, p. 2000657. https://doi.org/10.1002/marc.202000657
Photothermally Reconfigurable Shape Memory Magnetic Cilia
Liu, J. A.-C., Evans, B. A., & Tracy, J. B. (2020), ADVANCED MATERIALS TECHNOLOGIES, Vol. 5, p. 2000147. https://doi.org/10.1002/admt.202000147
Programmable Anisotropy and Percolation in Supramolecular Patchy Particle Gels
Song, J., Rizvi, M. H., Lynch, B. B., Ilavsky, J., Mankus, D., Tracy, J. B., … Holten-Andersen, N. (2020), ACS Nano, 14(12), 17018–17027. https://doi.org/10.1021/acsnano.0c06389
3D-Printed Silicone Soft Architectures with Programmed Magneto-Capillary Reconfiguration
Roh, S., Okello, L. B., Golbasi, N., Hankwitz, J. P., Liu, J. A.-C., Tracy, J. B., & Velev, O. D. (2019), ADVANCED MATERIALS TECHNOLOGIES, 4(4), 1800528. https://doi.org/10.1002/admt.201800528
Direct electrospinning of titania nanofibers with ethanol
Chapman, B. S., Mishra, S. R., & Tracy, J. B. (2019), DALTON TRANSACTIONS, 48(34), 12822–12827. https://doi.org/10.1039/c9dt01872g
Magnetic Actuators: 3D‐Printed Silicone Soft Architectures with Programmed Magneto‐Capillary Reconfiguration (Adv. Mater. Technol. 4/2019)
Roh, S., Okello, L. B., Golbasi, N., Hankwitz, J. P., Liu, J. A. C., Tracy, J. B., & Velev, O. D. (2019), Advanced Materials Technologies, 4(4), 1970021. https://doi.org/10.1002/ADMT.201970021
Photothermally and magnetically controlled reconfiguration of polymer composites for soft robotics
Liu, J. A.-C., Gillen, J. H., Mishra, S. R., Evans, B. A., & Tracy, J. B. (2019), SCIENCE ADVANCES, 5(8). https://doi.org/10.1126/sciadv.aaw2897

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