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Timothy Stephens

Adjunct Faculty

University of North Texas

Department of Chemistry

Email: TimothyStephens@my.unt.edu

Education

  • GAC, University of North Texas, 2022
    Major: Data Analytics
  • PhD, University of North Texas, 2014
    Major: Chemistry
    Specialization: Analytical Chemistry
    Dissertation: Characterization of Ionic Liquid Solvents using a Temperature Independent, Ion Specific Abraham Parameter Model
  • BA, University of Arizona, 2008
    Major: Chemistry

Professional Positions

  • Teaching Assistant, University of North Texas. University of North Texas. (2010 - Present).
  • Teaching Fellow, University of North Texas. University of North Texas. (2013 - 2013).
  • Chemistry Resource Center Tutor, University of North Texas. University of North Texas. (2012 - 2012).

    • Academic - Post-Secondary

  • Grader, University of North Texas. University of North Texas. (2009 - 2013).

Professional Memberships

  • American Chemical Society. (2013 - Present).
  • Mean Green Chemistry Demo Team. (2010 - 2014).
  • Kappa Kappa Psi. (2006 - 2008).

Teaching

Teaching Experience

    University of North Texas

  • CHEM 1360 - Context of Chemistry, 3 courses.
  • CHEM 1410 - General Chemistry for Science Majors, 11 courses.
  • CHEM 1420 - General Chemistry for Science Majors, 4 courses.
  • CHEM 1430 - Laboratory Sequence for General Chemistry, 300 courses.
  • CHEM 1440 - Laboratory Sequence for General Chemistry., 124 courses.
  • CHEM 3451 - Quantitative Analysis, 1 course.
  • CHEM 3452 - Quantitative Analysis Laboratory, 4 courses.

Awards and Honors

  • Robert Wade Brown Award, UNT Chemistry Department. (2012).

Research

Published Intellectual Contributions

    Book Chapter

  • Stephens, T., George, A., Ford, R., Mason, D. (2015). Profiling Texas Vodka: Laboratory and Field Experiences.
  • Stephens, T.W., George, A., Ford, R.L., Mason, D. (2015). Chemical Profile of Texas Vodka. Ethanol and Education: Alcohol as a Theme for Teaching Chemistry. 159-179.

    • Journal Article

  • Brumfield, M., Wadawadigi, A., Kuprasertkul, N., Mehta, S., Stephens, T.W., Barrera, M., De La Rosa, J., Kennemer, L., Meza, J., Acree, W.E., Abraham, M.H. (2015). Determination of Abraham model solute descriptors for three dichloronitrobenzenes from measured solubilities in organic solvents. Physics and Chemistry of Liquids. (53) 163-173.
  • Stephens, T.W., Hart, E., Kuprasertkul, N., Mehta, S., Wadawadigi, A., Acree, W.E., Abraham, M.H. (2014). Abraham Model Correlations for Describing Solute Transfer into Ionic Liquid Solvents: Calculation of Ion-Specific Equation Coefficients for the 4,5-Dicyano-2-(trifluoromethyl)imidazolide Anion. Physics and Chemistry of Liquids. (52) 777-791.
  • Acree, W.E., Stephens, T.W. (2014). Comments Concerning “Study of Molecular Interaction in Binary Liquid Mixtures of Ethyl Acetoacetate with Chloroform and Dimethylsulphoxide Using Excess Acoustic Parameters and Spectroscopic Methods”. Physics and Chemistry of Liquids. (52) 452-455.
  • Mutele, F., Alonso, D., Stephens, T.W., Acree, W., Baker, G. (2014). Infinite Dilution Activity Coefficients of Solutes Dissolved in Two Trihexy(tetradecyl)phosphonium Ionic Liquids Containing Chiral Anions. Journal of Chemical and Engineering Data. (59) 1877-1885.
  • Stephens, T.W., Chou, V., Quay, A.N., Shen, C., Dabadge, N., Tian, A., Loera, M., Willis, B., Wilson, A., Acree, W.E., Twu, P., Anderson, J.L., Abraham, M.H. (2014). Thermochemical Investigations of Solute Transfer into Ionic Liquid Solvents: Updated Abraham Model Equation Coefficients for Solute Activity Coefficient and Partition Coefficient Predictions. Physics and Chemistry of Liquids. (52) 488-518.
  • Jiang, R., Anderson, J.L., Stephens, T.W., Acree, W.E., Abraham, M.H. (2013). Abraham Model Correlations for Predicting Gas-to-Liquid Partition Coefficients and Activity Coefficients of Organic Solutes Dissolved in 1-(2-Methoxyethyl)-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate.. European Chemical Bulletin. 2 (741-751)
  • Mutelet, F., Hassan, E.R., Stephens, T.W., Acree, W., Baker, G. (2013). Activity Coefficients at Infinite Dilution for Organic Solutes Dissolved in Three 1-Alkyl-1-methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquids Bearing Short Linear Alkyl Side Chains of Three to Five Carbons.. Journal of Chemical and Engineering Data. (58) 2210-2218.
  • Acree, W.E., Stephens, T.W. (2013). Comments Regarding ‘Density, Speed of Sound, Refractive Index and Derivatives Properties of the Binary Mixture n-Hexane + n-Heptane (or n-Octane or n-Nonane), T = 288.15 K – 313.15 K.’. Physics and Chemistry of Liquids. (51) 429-431.
  • S, T.W., Willis, B., Dabadge, N., Tian, A., Acree, W.E., Abraham, M.H. (2013). Correlations of Solute Partitioning and Enthalpies of Solvation for Organic Solutes in Ionic Liquids Using a Temperature Independent Free Energy Relationship.. European Chemical Bulletin. (2) 887-897.
  • Twu, P., Anderson, J.L., Stephens, T.W., Lu, H., Satish, K., Shan, D., Acree, W.E., Abraham, M.H. (2013). Determination of the Solubilizing Character of 1-(2-Hydroxyethyl)-1-methylimidazolium tris(pentafluoroethyl)trifluorophosphate Based on the Abraham Solvation Parameter Model.. European Chemical Bulletin. (2) 954-964.
  • Bowen, K.R., Stephens, T.W., Lu, H., Satish, K., Shan, D., Acree, W.E., Abraham, M.H. (2013). Experimental and Predicted Solubilites of 3,4-dimethoxybenzoic acid in Select Organic Solvents of Varying Polarity and Hydrogen-Bonding Character.. European Chemical Bulletin. (2) 577-583.
  • T. W. Stephens, A. N. Quay, V. Chou, M. Loera, C. Shen, A. Wilson, W. E. Acree Jr., M. H. Abraham. (2012). Correlation of Solute Transfer into Alkane Solvents from Water and from the Gas Phase with Updated Abraham Model Equations.. Global Journal of Physical Chemistry. 3 1/1-1/42.
  • T. W. Stephens, A. Wilson, N. Dabadge, A. Tian, H. J. Hensley, M. Zimmerman, W. E. Acree Jr., M. H. Abraham. (2012). Correlation of Solute Transfer into Isooctane from Water and from the Gas Phase Based on the Abraham Model.. Global Journal of Physical Chemistry. 3 9/1-9/16.
  • T. W. Stephens, W. E. Acree, Jr., P. Twu, J. L. Anderson, G. A. Baker and M. H. Abraham. (2012). Correlation of the Solubilizing Abilities of 1-Butyl-1-methylpiperidinium bis(Trifluoromethylsulfonyl)imide and 1-Butyl-1-methylpyrrolidinium Tetracyanoborate.. Journal of Solution Chemistry. (41) 1165-1184.
  • P. Twu, J. L. Anderson, T. W. Stephens, W. E. Acree, Jr., M. H. Abraham. (2012). Determination of the Solubilizing Character of 1-Methoxyethyl-1-methylpiperidinium tris(pentafluoroethyl)trifluorophosphate Based on the Abraham Solvation Parameter Model. European Chemical Bulletin. (1) 212-222.
  • A. Wilson, T. W. Stephens, W. E. Acree, Jr.. (2012). Using Spectroscopy Experiments in Laboratory to Facilitate Learning in Chemistry Lecture.. (XXXIV-3) 409-413.
  • T. W. Stephens, N. E. De La Rosa, M. Saifullah, S. Ye, V. Chou, A. N. Quay, W. E. Acree Jr., M. H. Abraham. (2011). Abraham model correlations for solute partitioning into o-xylene, m-xylene and p-xylene from both water and the gas phase.. Fluid Phase Equilibria. (308) 64-71.
  • T. W. Stephens, N. E. De La Rosa, M. Saifullah, S. Ye, V. Chou, A. N. Quay, W. E. Acree Jr., M. H. Abraham. (2011). Abraham Model Correlations for Transfer of Neutral Molecules and Ions to Sulfolane.. Fluid Phase Equilibria. (309) 30-35.
  • T. W. Stephens, M. Loera, A. N. Quay, V. Chou, C. Shen, A. Wilson, W. E. Acree, Jr., M. H. Abraham. (2011). Correlation of Solute Transfer Into Toluene and Ethylbenzene from Water and from the Gas Phase Based on the Abraham Model.. (5) 104-121.
  • T. W. Stephens, M. Loera, M. Calderas, R. Diaz, N. Montney, W. E. Acree Jr., M. H. Abraham. (2011). Determination of Abraham Model Solute Descriptors for Benzoin based on Measured Solubility Ratios.. Physics and Chemistry of Liquids. (50) 254-265.
  • T. W. Stephens, V. Chou, A. N. Quay, W. E. Acree Jr., M. H. Abraham. (2011). Enthalpy of solvation correlations for organic solutes and gases dissolved in 1-propanol and tetrahydrofuran.. Thermochimica Acta. 519 103-113.
  • T. W. Stephens, N. E. De La Rosa, M. Saifullah, S. Ye, V. Chou, A. N. Quay, W. E. Acree Jr., M. H. Abraham. (2011). Enthalpy of Solvation Correlations for Organic Solutes and Gases Dissolved in 2-Propanol, 2-Butanol, 2-Methyl-1-propanol and Ethanol.. Thermochimica Acta.

Presentations Given

    Oral Presentation

  • Stephens, T.W. (Author & Presenter), Mason, D. (Author), Ford, R.L. (Author), George, A. (Author), Acree, W.E. (Author), 247th ACS National Meeting & Exposition, Shaken not Stirred, Y’all: A Comparison of Texas Vodkas, American Chemical Society, Dallas, TX, United States of America. (2014).
  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), Abraham, M.H. (Author), 247th ACS National Meeting & Exposition, Correlations of Solute Partitioning for Organic Solutes in Two Ionic Liquids Based on the 1-(2-methoxyethyl)-1-methylpiperidinum Cation Using a Temperature Independent Free Energy Relationship Based on the Abraham Solvation Model, American Chemical Society, Dallas, TX, United States of America. (2014).
  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), 69th ACS Southwest Regional Meeting, Determination and Correlation of Molar Entropies of Solvation for Three Piperidinium Based Ionic Liquids with the Abraham Model, American Chemical Society, Waco, TX, United States of America. (2013).
  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), Abraham, M.H. (Author), 245th ACS National Meeting & Exposition, Correlations of solute partitioning and enthalpies of solvation for organic solutes in two morpholinium ionic liquids using a temperature independent free energy relationship., American Chemical Society, New Orleans, LA, United States of America. (2013).
  • Stephens, T.W. (Author & Presenter), Willis, B. (Author), Dabadge, N. (Author), Tian, A. (Author), Acree, W.E. (Author), Abraham, M.H. (Author), 68th ACS Southwest Regional Meeting, Correlations of solute partitioning and enthalpies of solvation for organic solutes in the ionic liquids 1-hexyl-3-methylimidazolium tetracyanoborate, 1-(2-methoxyethyl)-1-methylpiperidinium bis(trifluoromethylsulfonyl)imide, and 1-(2-methoxyethyl)-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide using a temperature independent free energy relationship., American Chemical Society, Baton Rouge, LA, United States of America. (2012).

    • Poster

  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), Abraham, M.H. (Author), 247th ACS National Meeting & Exposition, Determination of Gas-to-Ionic Liquid Partition Coefficients for Ionic Liquids Using Two Temperature Independent Group Contribution Methods, American Chemical Society, Dallas, TX, United States of America. (2014).
  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), Abraham, M.H. (Author), 44th ACS Western Regional Meeting, Temperature independent free energy relationships for three ionic liquids based on the trifluorotris(perfluoroethyl)phosphate anion., American Chemical Society, Santa Clara, CA, United States of America. (2013).
  • Stephens, T.W. (Author & Presenter), Acree, W.E. (Author), Abraham, M.H. (Author), 245th ACS National Meeting & Exposition, Temperature independent cation-specific and anion-specific Abraham model coefficients for predicting the gas-to-ionic liquid partition coefficient., New Orleans, LA, United States of America. (2013).

    • Scholarly Meeting Contribution

  • Stephens, T. (Author), Robbyn, R. (Author), George, A. (Author & Presenter), Mason, D. (Author), 23rd Biennial Conference on Chemical Education, Profiling Texas Vodka: Laboratory and Field Experiences, United States of America. (2014 - 2014).
  • Stephens, T. (Author & Presenter), Ford, R. (Author), George, A. (Author), Mason, D. (Author), 247th Annual American Chemical Society National Meeting, Shaken not stirred, y'all: A comparison of select Texas vodkas, United States of America. (2014 - 2014).

Media Contributions

    Internet

  • "‘Salted not stirred y’all?’ Texas sold on salty vodka," (March 20, 2014).
  • "Texans Turn To A New Kind Of Spirit – Salty Vodkas," (March 20, 2014).
  • "Texans are turning to a different kind of spirit – vodka – and saltier is better," (March 19, 2014).

    • Magazine

  • "Texas Vodka, California Picnics," Chemical & Engineering News. (April 2014).

    • Newspaper

  • "UNT researchers shed light on Texas vodka," NT Daily. (April 3, 2014).