Joseph Tracy

Professor

University Faculty Scholar
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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

Quantification of Interface-Dependent Plasmon Quality Factors Using Single-Beam Nonlinear Optical Interferometry
Zhao, T., Steves, M. A., Chapman, B. S., Tracy, J. B., & Knappenberger, K. L. (2018), ANALYTICAL CHEMISTRY, 90(22), 13702–13707. https://doi.org/10.1021/acs.analchem.8b04101
Understanding and Controlling the Morphology of Silica Shells on Gold Nanorods
Rowe, L. R., Chapman, B. S., & Tracy, J. B. (2018), CHEMISTRY OF MATERIALS, 30(18), 6249–6258. https://doi.org/10.1021/acs.chemmater.8b00794
Heteroaggregation approach for depositing magnetite nanoparticles onto silica-overcoated gold nanorods
Chapman, B. S., Wu, W. C., Lo, Q. C., Holten-Andersen, N., & Tracy, J. B. (2017), Chemistry of Materials, 29(24), 10362–10368.
Chained Iron Microparticles for Directionally Controlled Actuation of Soft Robots
Schmauch, M. M., Mishra, S. R., Evans, B. A., Velev, O. D., & Tracy, J. B. (2017), ACS Applied Materials & Interfaces, 9(13), 11895–11901. https://doi.org/10.1021/acsami.7b01209
Direct monitoring of pulmonary disease treatment biomarkers using plasmonic gold nanorods with diffusion-sensitive OCT
Blackmon, R. L., Kreda, S. M., Sears, P. R., Chapman, B. S., Hill, D. B., Tracy, J. B., … Oldenburg, A. L. (2017), Nanoscale, 9(15), 4907–4917.
Enhanced Electrochemical Lithium-Ion Charge Storage of Iron Oxide Nanosheets
Niu, S., McFeron, R., Godı́nez-Salomón, F., Chapman, B. S., Damin, C. A., Tracy, J. B., … Rhodes, C. P. (2017), Chemistry of Materials, 29(18), 7794–7807. https://doi.org/10.1021/acs.chemmater.7b02315
Microwave Enhancement of Autocatalytic Growth of Nanometals
Ashley, B., Vakil, P. N., Lynch, B. B., Dyer, C. M., Tracy, J. B., Owens, J., & Strouse, G. F. (2017), ACS Nano, 11(10), 9957–9967. https://doi.org/10.1021/acsnano.7b04040
Nanoscale steady-state temperature gradients within polymer nanocomposites undergoing continuous-wave photothermal heating from gold nanorods
Maity, S., Wu, W.-C., Tracy, J. B., Clarke, L. I., & Bochinski, J. R. (2017), Nanoscale, 9(32), 11605–11618.
Size and Composition Control of {CoNi} Nanoparticles and Their Conversion into Phosphides
Marusak, K. E., Johnston-Peck, A. C., Wu, W.-C., Anderson, B. D., & Tracy, J. B. (2017). Size and Composition Control of CoNi Nanoparticles and Their Conversion into Phosphides. Chemistry of Materials, 29(7), 2739–2747. https://doi.org/10.1021/acs.chemmater.6b04335,
Imaging Extracellular Matrix Remodeling In Vitro by Diffusion-Sensitive Optical Coherence Tomography
Blackmon, R. L., Sandhu, R., Chapman, B. S., Casbas-Hernandez, P., Tracy, J. B., Troester, M. A., & Oldenburg, A. L. (2016), Biophysical Journal, 110(8), 1858–1868.
Selective and directional actuation of elastomer films using chained magnetic nanoparticles
Mishra, S. R., Dickey, M. D., Velev, O. D., & Tracy, J. B. (2016), Nanoscale, 8(3), 1309–1313.
Silica Overcoating of CdSe/CdS Core/Shell Quantum Dot Nanorods with Controlled Morphologies
Anderson, B. D., Wu, W.-C., & Tracy, J. B. (2016), Chemistry of Materials, 28(14), 4945–4952.
A dual wavelength-activatable gold nanorod complex for synergistic cancer treatment
Pacardo, D. B., Neupane, B., Rikard, S. M., Lu, Y., Mo, R., Mishra, S. R., … Gu, Z. (2015), Nanoscale, 7(28), 12096–12103.
Large-Scale Silica Overcoating of Gold Nanorods with Tunable Shell Thicknesses
Wu, W.-C., & Tracy, J. B. (2015), Chemistry of Materials, 27(8), 2888–2894.
Photochemical synthesis of size-tailored hexagonal ZnS quantum dots
Gonzalez, C. M., Wu, W.-C., Tracy, J. B., & Martin, B. (2015), Chemical Communications, 51(15), 3087–3090.
Thermal Stability of Gold Nanoparticles Embedded within Metal Oxide Frameworks Fabricated by Hybrid Modifications onto Sacrificial Textile Templates
Padbury, R. P., Halbur, J. C., Krommenhoek, P. J., Tracy, J. B., & Jur, J. S. (2015), Langmuir, 31(3), 1135–1141.
Aerosynthesis: Growth of Vertically-aligned Carbon Nanofibres with Air DC Plasma
Kodumagulla, A., Varanasi, V., Pearce, R. C., Wu, W. C., Hensley, D. K., Tracy, J. B., … Melechko, A. V. (2014), Nanomaterials and Nanotechnology, 4.
Control of Branching in Ni3C1-x Nanoparticles and Their Conversion into Ni12P5 Nanoparticles
Sarac, M. F., Wu, W.-C., & Tracy, J. B. (2014), Chemistry of Materials, 26(10), 3057–3064.
Large-scale silica overcoating of gold nanorods and their thermal stability
Wu, W.-C., & Tracy, J. B. (2014), Abstracts of Papers of the American Chemical Society, 248.
Large-scale silica overcoating of gold nanorods with tunable shell thicknesses
Wu, W.-C., & Tracy, J. B. (2014), Abstracts of Papers of the American Chemical Society, 248.
Nanoparticle conversion chemistry: Kirkendall effect, galvanic exchange, and anion exchange
Anderson, B. D., & Tracy, J. B. (2014), Nanoscale, 6(21), 12195–12216.
Probing biological nanotopology via diffusion of weakly constrained plasmonic nanorods with optical coherence tomography
Chhetri, R. K., Blackmon, R. L., Wu, W.-C., Hill, D. B., Button, B., Casbas-Hernandez, P., … Oldenburg, A. L. (2014), Proceedings of the National Academy of Sciences of the United States of America, 111(41), E4289–E4297.
Spatial temperature mapping within polymer nanocomposites undergoing ultrafast photothermal heating via gold nanorods
Maity, S., Wu, W.-C., Xu, C., Tracy, J. B., Gundogdu, K., Bochinski, J. R., & Clarke, L. I. (2014), Nanoscale, 6(24), 15236–15247.
Thermal stability of silica-coated and uncoated gold nanorods in different environments
Wu, W.-C., & Tracy, J. B. (2014), Abstracts of Papers of the American Chemical Society, 248.
Large-scale synthesis of gold nanorods through continuous secondary growth
Kozek, K. A., Kozek, K. M., Wu, W. C., Mishra, S. R., & Tracy, J. B. (2013), Chemistry of Materials, 25(22), 4537–4544.
Magnetic field-directed self-assembly of magnetic nanoparticles
Tracy, J. B., & Crawford, T. M. (2013), MRS Bulletin, 38(11), 915–920.
Airbrushed Nickel Nanoparticles for Large-Area Growth of Vertically Aligned Carbon Nanofibers on Metal (Al, Cu, Ti) Surfaces
Sarac, M. F., Anderson, B. D., Pearce, R. C., Railsback, J. G., Oni, A. A., White, R. M., … Tracy, J. B. (2013), Acs Applied Materials & Interfaces, 5(18), 8955–8960.
Airbrushed nickel nanoparticles for large-area growth of vertically aligned carbon nanofibers on metal surfaces and their transfer into polydimethylsiloxane (PDMS) films for impalefection
Sarac, M. F., Pearce, R. C., Anderson, B. D., Railsback, J. G., Hensley, D. K., McKnight, T. E., … Melechko, A. V. (2013), Abstracts of Papers of the American Chemical Society, 245.
Anisotropic Thermal Processing of Polymer Nanocomposites via the Photothermal Effect of Gold Nanorods
Maity, S., Kozek, K. A., Wu, W.-C., Tracy, J. B., Bochinski, J. R., & Clarke, L. I. (2013), Particle & Particle Systems Characterization, 30(2), 193–202.
Bulky adamantanethiolate and cyclohexanethiolate ligands favor smaller gold nanoparticles with altered discrete sizes
Krommenhoek, P. J., Wang, J., Hentz, N., Johnston-Peck, A. C., Kozek, K. A., Kalyuzhny, G., & Tracy, J. B. (2013), Abstracts of Papers of the American Chemical Society, 245.
Composition-Mediated Order-Disorder Transformation in FePt Nanoparticles
Johnston-Peck, A. C., Cullen, D. A., & Tracy, J. B. (2013), Particle & Particle Systems Characterization, 30(8), 678–682.
Control of branching in dendritic Ni3C1-x nanoparticles and their conversion into phosphides
Sarac, M. F., Wu, W.-C., & Tracy, J. B. (2013), Abstracts of Papers of the American Chemical Society, 246.
Large-Scale Synthesis of Gold Nanorods through Continuous Secondary Growth
Kozek, K. A., Kozek, K. M., Wu, W.-C., Mishra, S. R., & Tracy, J. B. (2013), Chemistry of Materials, 25(22), 4537–4544.
Magnetic Field-Directed Self-Assembly of Magnetic Nanoparticle Chains in Bulk Polymers
Krommenhoek, P. J., & Tracy, J. B. (2013), Particle & Particle Systems Characterization, 30(9), 759–763.
Magnetic field-directed self-assembly of magnetic nanoparticle chains in bulk polymers
Krommenhoek, P. J., Spontak, R. J., & Tracy, J. B. (2013), Abstracts of Papers of the American Chemical Society, 245.
Magnetic field-directed self-assembly of magnetic nanoparticles
Tracy, J. B., & Crawford, T. M. (2013), Mrs Bulletin, 38(11), 915–920.
Motility-, autocorrelation-, and polarization-sensitive optical coherence tomography discriminates cells and gold nanorods within 3D tissue cultures
Oldenburg, A. L., Chhetri, R. K., Cooper, J. M., Wu, W.-C., Troester, M. A., & Tracy, J. B. (2013), Optics Letters, 38(15), 2923–2926.
Nanostructural transformations during the reduction of hollow and porous nickel oxide nanoparticles
Medford, J. A., Johnston-Peck, A. C., & Tracy, J. B. (2013), Nanoscale, 5(1), 155–159.
Transfer of Vertically Aligned Carbon Nanofibers to Polydimethylsiloxane (PDMS) While Maintaining their Alignment and Impalefection Functionality
Pearce, R. C., Railsback, J. G., Anderson, B. D., Sarac, M. F., McKnight, T. E., Tracy, J. B., & Melechko, A. V. (2013), Acs Applied Materials & Interfaces, 5(3), 878–882.
Bulky Adamantanethiolate and Cyclohexanethiolate Ligands Favor Smaller Gold Nanoparticles with Altered Discrete Sizes
Krommenhoek, P. J., Wang, J., Hentz, N., Johnston-Peck, A. C., Kozek, K. A., Kalyuzhny, G., & Tracy, J. B. (2012), Acs Nano, 6(6), 4903–4911.
Enabling of nanoparticle application and function on the surface of fibrous textiles by atomic layer deposition
Halbur, J., Krommenhoek, P. J., Everitt, H. O., Tracy, J. B., & Jur, J. S. (2012), Abstracts of Papers of the American Chemical Society, 243.
Large-scale synthesis of gold nanorods through continuous secondary growth
Kozek, K. A., Kozek, K. M., Wu, W.-C., & Tracy, J. B. (2012), Abstracts of Papers of the American Chemical Society, 244.
Laterally patterned magnetic nanoparticles
Jie, Y., Niskala, J. R., Johnston-Peck, A. C., Krommenhoek, P. J., Tracy, J. B., Fan, H., & You, W. (2012), Journal of Materials Chemistry, 22(5), 1962–1968.
Long-range alignment of gold nanorods in electrospun polymer nano/microfibers
Kozek, K. A., Roskov, K. E., Wu, W.-C., Chhetri, R. K., Oldenburg, A. L., Spontak, R. J., & Tracy, J. B. (2012), Abstracts of Papers of the American Chemical Society, 243.
Phase transformation of alumina-coated FePt nanoparticles
Johnston-Peck, A. C., & Tracy, J. B. (2012), Journal of Applied Physics, 111(7).
Coating Alumina on Catalytic Iron Oxide Nanoparticles for Synthesizing Vertically Aligned Carbon Nanotube Arrays
Wang, X., Krommenhoek, P. J., Bradford, P. D., Gong, B., Tracy, J. B., Parsons, G. N., … Zhu, Y. T. (2011), Acs Applied Materials & Interfaces, 3(11), 4180–4184.
Effects of Ligand Monolayers on Catalytic Nickel Nanoparticles for Synthesizing Vertically Aligned Carbon Nanofibers
Sarac, M. F., Wilson, R. M., Johnston-Peck, A. C., Wang, J., Pearce, R., Klein, K. L., … Tracy, J. B. (2011), Acs Applied Materials & Interfaces, 3(4), 936–940.
Formation and Grain Analysis of Spin-Cast Magnetic Nanoparticle Monolayers
Johnston-Peck, A. C., Wang, J. W., & Tracy, J. B. (2011), Langmuir, 27(8), 5040–5046.
H-1, C-13 and P-31 NMR study of precursor evolution in the synthesis of magic-size II-VI semiconductor nanocrystals
Rachtman, E., Jung, M., Johnston-Peck, A. C., Tracy, J. B., & Kalyuzhny, G. (2011), Abstracts of Papers of the American Chemical Society, 241.
Imaging three-dimensional rotational diffusion of plasmon resonant gold nanorods using polarization-sensitive optical coherence tomography
Chhetri, R. K., Kozek, K. A., Johnston-Peck, A. C., Tracy, J. B., & Oldenburg, A. L. (2011), Physical Review E, 83(4).
Long-Range Alignment of Gold Nanorods in Electrospun Polymer Nano/Microfibers
Roskov, K. E., Kozek, K. A., Wu, W.-C., Chhetri, R. K., Oldenburg, A. L., Spontak, R. J., & Tracy, J. B. (2011), Langmuir, 27(23), 13965–13969.
Silver nanoparticles stabilized by sterically-bulky ligands
Kozek, K. A., Johnston-Peck, A. C., Wang, J., & Tracy, J. B. (2011), Abstracts of Papers of the American Chemical Society, 242.
Sinter-free phase conversion and scanning transmission electron microscopy of FePt nanoparticle monolayers
Johnston-Peck, A. C., Scarel, G., Wang, J., Parsons, G. N., & Tracy, J. B. (2011), Nanoscale, 3(10), 4142–4149.
Synthesis and optical properties of nanocrystals, nanowires, and nanoplates of ZnSe and ZnTe
Gong, K., Johnston-Peck, A. C., Tracy, J. B., & Kalyuzhny, G. (2011), Abstracts of Papers of the American Chemical Society, 241.
Synthesis of Au(Core)/Ag(Shell) Nanoparticles and their Conversion to AuAg Alloy Nanoparticles
Shore, M. S., Wang, J. W., Johnston-Peck, A. C., Oldenburg, A. L., & Tracy, J. B. (2011), Small, 7(2), 230–234.
Synthesis of ligand-stabilized CoNi nanoparticles with tunable sizes and compositions
Marusak, K. E., Johnston-Peck, A. C., & Tracy, J. B. (2011), Abstracts of Papers of the American Chemical Society, 242.
Nanostructural transformations during reactions of metal nanoparticles
Tracy, J. B. (2010), Abstracts of Papers of the American Chemical Society, 239.
Size-Dependent Nanoscale Kirkendall Effect During the Oxidation of Nickel Nanoparticles
RAILSBACK, J. G., JOHNSTON-PECK, A. C., WANG, J. W., & TRACY, J. B. (2010), ACS NANO, 4(4), 1913–1920.
COLL 111-Formation and grain analysis of magnetic nanoparticle monolayers
Johnston-Peck, A. C., Wang, J., & Tracy, J. B. (2009), Abstracts of Papers of the American Chemical Society, 238.
Nickel Phosphide Nanoparticles with Hollow, Solid, and Amorphous Structures
WANG, J. W., JOHNSTON-PECK, A. C., & TRACY, J. B. (2009), CHEMISTRY OF MATERIALS, 21(19), 4462–4467.
Synthesis and Structural and Magnetic Characterization of Ni(Core)/NiO(Shell) Nanoparticles
JOHNSTON-PECK, A. C., WANG, J. W., & TRACY, J. B. (2009), ACS NANO, 3(5), 1077–1084.
Tandem Mass Spectrometry of Thiolate-Protected Au Nanoparticles NaxAu25(SC2H4Ph)(18-y)(S(C2H4O)(5)CH3)(y)
FIELDS-ZINNA, C. A., SAMPSON, J. S., CROWE, M. C., TRACY, J. B., PARKER, J. F., DENEY, A. M., … MURRAY, R. W. (2009), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 131(38), 13844–13851.
Gold nanoparticles with perfluorothiolate ligands
DASS, A., GUO, R., TRACY, J. B., BALASUBRAMANIAN, R., DOUGLAS, A. D., & MURRAY, R. W. (2008), LANGMUIR, 24(1), 310–315.
INOR 620-Exchange bias and the magnetic properties of oxidized nickel nanoparticles
WANG, J. W., JOHNSTON-PECK, A. C., & TRACY, J. B. (2008), ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 236.
Incorporation of iron oxide nanoplarticles and quantum dots into silica microspheres
INSIN, N., TRACY, J. B., LEE, H., ZIMMER, J. P., WESTERVELT, R. M., & BAWENDI, M. G. (2008), ACS NANO, 2(2), 197–202.
NUCL 27-Magnetic and metallic monolayer-protected nanoparticles
TRACY, J. B. (2008), ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 236.
Nanoparticle MALDI-TOF mass spectrometry without fragmentation: Au-25(SCH2CH2Ph)(18) and mixed monolayer Au-25(SCH2CH2Ph)(18-x)(L)(x)
DASS, A., STEVENSON, A., DUBAY, G. R., TRACY, J. B., & MURRAY, R. W. (2008), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 130(18), 5940–5946.
Size limitations for the formation of ordered striped nanoparticles
CARNEY, R. P., DEVRIES, G. A., DUBOIS, C., KIM, H., KIM, J. Y., SINGH, C., … STELLACCI, F. (2008), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 130(3), 798-+.
COLL 242-Nanoparticle-based optical probes for chemical imaging
Tracy, J. B., Crowe, M. C., Fields-Zinna, C. A., Parker, J. F., Kalyuzhny, G., Menard, L. D., … Murray, R. W. (2007), Abstracts of Papers of the American Chemical Society, 233.
COLL 270-Fluorinated gold thiolate nanoparticles by Brust synthesis and ligand exchange
Dass, A., Gao, R., Balasubramanian, R., Douglas, A. D., Tracy, J. B., & Murray, R. W. (2007), Abstracts of Papers of the American Chemical Society, 234.
Electrospray ionization mass spectrometry of uniform and mixed monolayer nanoparticles: Au-25[S(CH2)(2)Ph](18) and Au-25[S(CH2)(2)Ph](18-x)(SR)(x)
TRACY, J. B., CROWE, M. C., PARKER, J. F., HAMPE, O., FIELDS-ZINNA, C. A., DASS, A., & MURRAY, R. W. (2007), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129(51), 16209–16215.
Fully ferrocenated hexanethiolate monolayer-protected gold clusters
WOLFE, R. L., BALASUBRAMANIAN, R., TRACY, J. B., & MURRAY, R. W. (2007), LANGMUIR, 23(4), 2247–2254.
INOR 434-Incorporation of magnetic nanoparticles and quantum dots into silica microspheres
Insin, N., Tracy, J. B., Lee, H., Zimmer, J. P., Westervelt, R. M., & Bawendi, M. G. (2007), Abstracts of Papers of the American Chemical Society, 234.
Poly(ethylene glycol) ligands for high-resolution nanoparticle mass spectrometry
TRACY, J. B., KALYUZHNY, G., CROWE, M. C., BALASUBRAMANIAN, R., CHOI, J. P., & MURRAY, R. W. (2007), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129(21), 6706-+.
Preparation and characterization of bimetal thiolate monolayer protected clusters (MPCs)
Fields-Zinna, C. A., Tracy, J. B., Crowe, M. C., & Murray, R. W. (2007), Abstracts of Papers of the American Chemical Society, 234.
Arylthiolate-protected silver quantum dots
BRANHAM, M. R., DOUGLAS, A. D., MILLS, A. J., TRACY, J. B., WHITE, P. S., & MURRAY, R. W. (2006), LANGMUIR, 22(26), 11376–11383.
COLL 236-Characterization of small Au monolayer protected clusters using electrospray mass spectrometry
Tracy, J. B., Kalyuzhny, G., Menard, L. D., Balasubramanian, R., Choi, J.-P., Crowe, M. C., … Murray, R. W. (2006), Abstracts of Papers of the American Chemical Society, 232.
Chemistry of metal and metal oxide nanoparticles: Characterization of small Au nanoparticles using electrospray mass spectrometry
Tracy, J. B., Kalyuzhny, G., Menard, L. D., Balasubramanian, R., Choi, J.-P., Crowe, M. C., … Murray, R. W. (2006), Abstracts of Papers of the American Chemical Society, 232, 18.
Defects in CoO in oxidized cobalt nanoparticles dominate exchange biasing and exhibit anomalous magnetic properties
TRACY, J. B., & BAWENDI, M. G. (2006), PHYSICAL REVIEW B, 74(18).
Engineering InAsxP1-x/InP/ZnSe III-V alloyed core/shell quantum dots for the near-infrared
KIM, S. W., ZIMMER, J. P., OHNISHI, S., TRACY, J. B., FRANGIONI, J. V., & BAWENDI, M. G. (2005), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127(30), 10526–10532.
Exchange biasing and magnetic properties of partially and fully oxidized colloidal cobalt nanoparticles
TRACY, J. B., WEISS, D. N., DINEGA, D. P., & BAWENDI, M. G. (2005), PHYSICAL REVIEW B, 72(6).
Phosphine oxide polymer for water-soluble nanoparticles
KIM, S. W., KIM, S., TRACY, J. B., JASANOFF, A., & BAWENDI, M. G. (2005), JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 127(13), 4556–4557.
Preparation, characterization and applications of free-standing single walled carbon nanotube thin films
HENNRICH, F., LEBEDKIN, S., MALIK, S., TRACY, J., BARCZEWSKI, M., ROSNER, H., & KAPPES, M. (2002), PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 4(11), 2273–2277.
The effect of oxidation state and speciation on XANES spectra of plutonium.
VEIRS, D. K., CONRADSON, S. D., CLARK, D. L., KEOGH, D. W., NEU, M. P., REILLY, S. D., … TRACY, J. B. (1999), ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 217, U59.

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