Browsing Chemistry Faculty Research, Publications and Presentations by Title

Now showing items 99-118 of 233

  • Intramolecular Nucleophilic-Substitution by Phosphinate and Thiophosphinate Anions - Relative Rates of Formation of 5-Membered and 6-Membered Rings 

    CHAUDHRY, A., MJP HARGER, P. SHUFF, and A. THOMPSON. 1995. "Intramolecular Nucleophilic-Substitution by Phosphinate and Thiophosphinate Anions - Relative Rates of Formation of 5-Membered and 6-Membered Rings." Journal of the Chemical Society-Chemical Communications: 83-84.
    No abstract available.

  • Investigation of factors affecting crystallization of cyclopentane clathrate hydrate 

    Reproduced from Whitman, Catherine A., Roman Mysyk, and Mary Anne White. 2008. "Investigation of factors affecting crystallization of cyclopentane clathrate hydrate." Journal of Chemical Physics 129(17): 174502-174502, with the permission of AIP Publishing.
    We report the results of systematic investigations of the influence of thermal history and other factors on crystallization of a model clathrate hydrate (cyclopentane hydrate) studied as water-in-oil and oil-in-water ...

  • An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes 

    Yidan Cao, Benjamin Scott, R.A. Dunlap, Jun Wang and M.N. Obrovac, An Investigation of the Fe-Mn-Si System for Li-Ion Battery Negative Electrodes, J. Electrochem. Soc., 166 (2019) A21-A26. doi: 10.1149/2.1111816jes
    Fe-Mn-Si alloys prepared by ball milling were investigated as negative electrodes for Li-ion batteries. X-ray diffraction and room temperature 57Fe Mössbauer measurements were used to characterize alloy structure, which ...

  • Investigation of the NaNixMn1-xO2 (0 ≤ x ≤ 1) System for Na-ion Battery Cathode Materials (Preprint) 

    Published Version: R. Fielden and M. N. Obrovac, Investigation of the NaNixMn1-xO2 (0 ≤ x ≤ 1) System for Na-Ion Battery Cathode Materials, J. Electrochem. Soc., 162 (2015), A453-A459. https://doi.org/10.1149/2.0551503jes
    Layered NaNixMn1-xO2 (0 ≤ x ≤ 1) oxides were prepared via solid state reactions. Different reaction conditions were required to obtain phase pure samples, depending on the value of x. The 0 ≤ x ≤ 0.1 compositions were ...

  • Investigations into the nucleophilic meso-substitution of F-BODIPYs and improvements to the synthesis of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene. 

    Crawford, Sarah M., and Alison Thompson. 2011. "Investigations into the nucleophilic meso-substitution of F-BODIPYs and improvements to the synthesis of 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene." Heterocycles 83(2): 311-322.
    A series of three F-BODIPYs, with varying levels of steric crowding about the meso-position were selected to investigate nucleophilic meso-substitution of F-BODIPYs. The synthesis of one of these F-BODIPYs, 4,4-difluor ...

  • Investigations regarding the utility of prodigiosenes to treat leukemia 

    Smithen, Deborah A., A. Michael Forrester, Dale P. Corkery, Graham Dellaire, et al. 2013. "Investigations regarding the utility of prodigiosenes to treat leukemia." Organic & Biomolecular Chemistry 11(1): 62-68.
    Prodigiosenes, possessing a 4-methoxypyrrolyldipyrrin skeleton, are known for their anti-cancer activity. Structural modification of the C-ring resulted in a series of prodigiosenes that displayed promising activity against ...

  • The ionic versus metallic nature of 2D electrides: A density-functional description 

    Dale, Stephen; and Johnson, Erin. (2017). The ionic versus metallic nature of 2D electrides: A density-functional description. Physical Chemistry Chemical Physics, 19, 27343-27352. https://doi.org/10.1039/C7CP04825D

  • Isolation and characterization of a novel tetrahydro-[2,2 ']bipyrrolyl dimer as an impurity from a Knorr reaction 

    Thompson, A., Y. Alattar, CS Beshara, RK Burley, et al. 2004. "Isolation and characterization of a novel tetrahydro-[2,2 ']bipyrrolyl dimer as an impurity from a Knorr reaction." Journal of Heterocyclic Chemistry 41(5): 777-781.
    A novel dimer, tetraethyl 2,2',3,3'-tetramethyl-1,1',2,2'-tetrahydro-4H,4'H-2,2'-bipyrrolyi-5,5,5',5'-tetracarboxylate, has been isolated as an impurity (0.4% yield) from a Knorr reaction for the synthesis of ...

  • Isothermal Calorimetry Evaluation of Metallurgical Silicon as a Negative Electrode Material for Li-Ion Batteries 

    Chevrier, Zilai Yan, Stephen L. Glazier, M. N. Obrovac and L.J. Krause. Isothermal Calorimetry Evaluation of Metallurgical Silicon as a Negative Electrode Material for Li-Ion Batteries. J. Electrochem. Soc. (2021), 168 (3), 030504.
    The structural evolution of Si during lithiation and delithiation is uniquely dependent on the cycling conditions and can show either reversible or path dependent behavior. In this paper, metallurgical Si (large crystalline ...

  • Lab-scale chemical vapor deposition onto powders 

    113. Jun Wang and M.N Obrovac. Lab-scale Chemical Vapor Deposition onto Powders. AIP Advances, 12 (2022) 075209. doi: https://doi.org/10.1063/5.0095882
    In this paper, a laboratory chemical vapor deposition (CVD) reactor is described, which features an opposing screw rotating fluidized bed. The reactor efficiently concentrates powdered reactants in the reaction zone while ...

  • Li Insertion in Ball Milled Si-Mn Alloys 

    Yidan Cao, J.C. Bennett, R.A. Dunlap and M.N. Obrovac, Li Insertion in Ball Milled Si-Mn Alloys, J. Electrochem. Soc., 165 (2018) A1734-A1740.
    Si1-xMnx (0 ≤ x ≤0.5, x=0.05)alloyswereprepared by ball milling and studied as negative electrode materials in Li cells. These alloys were found to be unique amongtransition metals. When x ≤ 0.35, the alloys are essentially ...

  • Li-ion Battery Negative Electrodes Based on the FexZn1-x Alloy System (Preprint) 

    Published Version: L. MacEachern, R.A. Dunlap and M.N. Obrovac, Li-ion Battery Negative Electrodes Based on the FexZn1−x Alloy System, J. Non-Cryst. Solids, 409 (2015), 183-190. https://doi.org/10.1016/j.jnoncrysol.2014.11.026
    Thin-film Fe-Zn libraries were investigated as negative electrode materials for Li-ion batteries using combinatorial and high-throughput techniques. X-ray diffraction, Mössbauer effect spectroscopy and electron microprobe ...

  • Li15Si4 Formation in Silicon Thin Film Negative Electrodes 

    D.S. Iaboni and M.N. Obrovac, Li15Si4 Formation in Silicon Thin Film Negative Electrodes, J. Electrochem. Soc., 163 (2016), A255-A261.
    The conditions for Li15Si4 formation in Si thin film negative electrodes was studied during charge and discharge cycling in lithium cells. It was found that Li15Si4 formation can be suppressed during cycling of Si thin ...

  • LiF as an Alloy Component or Slurry Additive in Si-Alloy Anodes 

    Robert S. Young, Benjamin Scott, Congxiao Wei and M. N. Obrovac. LiF as an Alloy Component or Slurry Additive in Si-Alloy Anodes. J. Electrochem. Soc. (2020), 167 (16), 160524.
    Electrolyte additives are commonly used to improve electrochemical performance in Li-ion cells. The use of solids as electrolyte additives is far less common. Here, Si40'(FeSi2)(60−x)'(LiF)(x)' (' = volume percent) alloys ...

  • Lithium Insertion in Nanostructured Si1-xTix Alloys 

    Yukun Wang, Simeng Cao, Mariya Kalinina, Lituo Zheng, Linjun Li, Min Zhu and M.N. Obrovac, Lithium Insertion in Nanostructured Si1-xTix Alloys, J. Electrochem. Soc., 164 (2017) A3006-A3010.
    Nanostructured Si1-xTix alloys (0 ≤ x ≤ 0.3) prepared by ball milling were studied as negative electrode materials in Li cells. The alloys comprised a nanocrystalline andamorphousSiphaseandananocrystallineC49TiSi2 phase. ...

  • Low thermal conductivity of the negative thermal expansion material, HfMo2O8 

    Kennedy, Catherine A., Mary Anne White, Angus P. Wilkinson, and Tamas Varga. 2007. "Low thermal conductivity of the negative thermal expansion material, HfMo2O8." Applied Physics Letters 90(15): 151906-151906.
    The thermal conductivity of the cubic polymorph of hafnium molybdate, HfMo2O8, was determined over the temperature range of 2-400 K. The values of thermal conductivity were low (0.64 +/- 0.15 W m(-1) K-1 at T=300 K for a ...

  • Measuring the Geometric Component of the Transition-Probability in a 2-Level System 

    ZWANZIGER, JW, SP RUCKER, and GC CHINGAS. 1991. "Measuring the Geometric Component of the Transition-Probability in a 2-Level System." Physical Review a 43(7): 3232-3240. doi:10.1103/PhysRevA.43.3232
    We describe the measurement of a component of the nonadiabatic transition probability in a two-level system that depends only on the path through parameter space followed by the Hamiltonian, and not on how fast the path ...

  • Mechanical–Structural Investigation of Ion-Exchanged Lithium Silicate Glass using Micro-Raman Spectroscopy 

    Mechanical–Structural Investigation of Ion-Exchanged Lithium Silicate Glass using Micro-Raman Spectroscopy Courtney Calahoo, J. W. Zwanziger, and Ian S. Butler The Journal of Physical Chemistry C 2016 120 (13), 7213-7232 DOI: 10.1021/acs.jpcc.6b01720
    Micro-Raman spectroscopy was used to determine the structural modifications occurring in a simple ion-exchanged glass. The base lithium silicate composition 30Li2O–70SiO2 was studied as it underwent ion exchange, Li+ ↔ K+, ...

  • Microwave-accelerated synthesis of benzyl 3,5-dimethyl-pyrrole-2-carboxylate 

    Regourd, Jasmine, Ian M. Comeau, Cory S. Beshara, and Alison Thompson. 2006. "Microwave-accelerated synthesis of benzyl 3,5-dimethyl-pyrrole-2-carboxylate." Journal of Heterocyclic Chemistry 43(6): 1709-1714.
    Benzyl 3,5-dimethyl-pyrrole-2-carboxylate, a very useful pyrrole in porphyrin and dipyrromethene synthesis, can be synthesized via the Knorr-type reaction, but in low yield. Alternative routes to benzyl 3,5-dimethyl-pyrr ...

  • Microwave-assisted reduction of F-BODIPYs and dipyrrins to generate dipyrromethanes 

    Melanson, J. A., Smithen, D. A., Cameron, T. S., & Thompson, A. (2013). Microwave-assisted reduction of F-BODIPYs and dipyrrins to generate dipyrromethanes. Canadian Journal of Chemistry, 92(8), 688-694. doi: https://doi.org/10.1139/cjc-2013-0341
    The reduction of BODIPYs and dipyrrins to dipyrromethanes, via a reaction involving ethylene glycol and sodium methoxide, is reported. When benzyl alcohol is used in place of ethylene glycol, the addition of 2,4-dinitrop ...