Publications

72. J. Ennist, E. A. Gobrogge, K. H. Schlick, R. A. Walker and M. J. Cloninger, "Cyclodextrin-functionalized Chromatographic Materials Tailored for Reversible Adsorption" submitted to Applied Materials and Interfaces.

71. E. A. Gobrogge and R. A. Walker, "Binary Solvent Organization at Silica/Liquid Interfaces: Preferential Ordering in Acetonitrile-Methanol Mixtures" J. Phys. Chem. Lett. 5 2688-2693 (2014).

70. B. C. Eigenbrodt and R. A. Walker, "In situ Raman measurements of solid oxide fuel cell devices" Spectroscopy. accepted.

69. M. D. McIntyre, J. R. Wambeke, and R. A. Walker, "In situ optical studies of SOFCS operating with dry and humidified methane: mechanisms of coke suppression" submitted to Fuel Cells.

68. K. A. Burbank, R. A. Walker, and B. M. Peyton, "A molecular basis of metal toxicity by Uranium(VI) in bacterial dehydrogenase enzymes" submitted to J. Bioinorganic Chem.

67. R. A. Walker, K. W. Reeping, M. D. McIntyre, D. M. Halat, and J. D. Kirtley, "Electrolyte Dependence on Ni/YSZ Anode Carbon Tolerance Using In Situ Raman Spectroscopy" Electrochemical Society Trans. 61 (1) 57-63 (2014).

66. J. D. Kirtley, D. A. Steinhurst, J. C. Owrutsky, M. B. Pomfret, and R. A. Walker, "In situ optical studies of methane and biogas oxidation on high temperature solid oxide fuel cell anodes" Phys. Chem. Chem. Phys. 16 (1) 227-236 (2014).

65. . Roy1, S. Liu, A. R.Siler, B. L. Woods, J. T. Fourkas, J. D. Weeks and R. A. Walker, "Nonpolar adsorption at the silica methanol interface: Surface mediated polarity and solvent density across a strongly associating solid/liquid boundary" J. Phys. Chem. C. 117 (29) 6224-6233 (2013).

64. J. D. Kirtley, T. P Oswell, A. Singh, D. M. Halat, J. M. Hill and R. A. Walker, "High temperature carbon removal from SOFC Ni cermet anodes with H2O, CO2 and O2: In situ Vibrational Studies" J. Phys. Chem. 117 (49) 25908-25916 (2013).

63. M. D. McIntyre, D. M. Halat, K. L. Reeping, J. D. Kirtley1 and R. A. Walker, "In situ Spectroscopic Studies of Carbon Formation in SOFCs Operating with Syn gas" Electrochemical Society Trans.. 57 (1) 1267-1275 (2013).

62. J. D. Kirtley, M. D. McIntyre, D. M. Halat, and R. A. Walker, "Insights into SOFC Ni/YSZ anode degradation using in situ spectro-chronopotentiometry with solid oxide fuel cell materials" Electrochemical Society Trans. 50 (44) 3-15 (2013).

61. E. A. Gobrogge, B. L. Woods, and R. A. Walker, "Liquid Organization and Solvation Properties at Polar Solid/Liquid Interfaces" Faraday Discussions. 167 (1) 309-327 (2013).

60. B. L. Woods and R. A. Walker, "pH Effects on Molecular Adsorption and Solvation at Silica/Aqueous Interfaces" J. Phys. Chem. A. 117 6224-6233 (2013).

59. M. B. Pomfret, R. A. Walker, and J. C. Owrutsky, "High Temperature Chemistry in Solid Oxide Fuel Cells: In situ Optical Studies" J. Phys. Chem. Lett. 3 3053-3064 (2012).

58. J. D. Kirtley, D. M. Halat, M. D. McIntyre1, B. C. Eigenbrodt1 and R. A. Walker, "High Temperature “Spectro-chrono-potentiometry”: Quantitative Correlations between in Situ Raman Spectroscopy and Electrochemical Performance in Solid Oxide Fuel Cells" Analytical Chemistry. 84 9745-9753 (2012).

57. F. Ding, C. A. Rivera, Q. Zhong, K. Manfred, X. X. He, M. R. Brindza1, R. A. Walker, J. T. Fourkas, "Structure and dynamics of trimethylacetonitrile at silica/vapor, silica/liquid, and liquid vapor interfaces" J. Phys. Chem. C. 116 7000-7009 (2012).

56. F. Ding, Q. Zhong, K. Manfred, X. X. He, J. S. Bender, M. R. Brindza, R. A. Walker, and J. T. Fourkas, "Structure and dynamics of trimethylacetonitrile at silaca/vapor, silica/liquid, and liquid vapor interfaces" J. Phys. Chem. C. 116 4019-4025 (2012).

55. D. Roy, S. Piontek and R. A. Walker "Surface induced changes in coumarin solvation and photochemistry at polar solid/liquid interfaces" Phys. Chem. Chem. Phys. 13 14758-14766 (2011).

54. A. R. Siler and R. A. Walker, "The effects of solvent structure on interfacial polarity across strongly associating silica/alcohol interfaces" J. Phys. Chem. C, 115 9637-9643 (2011).

53. B. C. Eigenbrodt, J. D. Kirtley, and R. A. Walker, "In situ optical studies of solid oxide fuel cells operating with dry and wet oxygenated fuels" Electrochemistry Society Transactions (SOFC XII), 35 (1) 2789 - 2798 (2011).

52. B. C. Eigenbrodt and R. A. Walker, "High Temperature Raman Mapping of Surface Electrolyte Oxide Concentration in Solid Oxide Fuel Cells" Analytical Methods, accepted (2011).

51. J. D. Kirtley, B. C. Eigenbrodt and R. A. Walker, "In situ optical studies of oxidation kinetics of Ni/YSZ cermet anodes" Electrochemistry Society Transactions (NEMCA 8), 33 (40) 25 – 34 (2011).

50. B. C. Eigenbrodt, M. B. Pomfret, D. A. Steinhurst, J. C. Owrutsky and R. A. Walker "Direct, in situ optical studies of solid oxide fuel cells operating with methanol and methane" J. Phys. Chem. C .115 2895-2903 (2011).

49. F. Ding, Z. Hu, Q. Zhong, K. Manfred, R. R. Gattass, M. R. Brindza, J. T. Fourkas, R. A. Walker and J. D. Weeks "Interfacial Organization of Acetonitrile: Experiment and Theory" J. Phys. Chem. C 114 17651-17659 (2010).

48. M. B. Pomfret, J. C. Owrutsky, and R. A. Walker "In situ Optical Studies of Solid Oxide Fuel Cells" Ann. Rev. Anal. Chem., 3 151-174 (2010).

47. M. R. Brindza, F. Ding, J. T. Fourkas and R. A. Walker "n-Alkane Adsorption to Polar Solid Surfaces" J Chem. Phys. 132 114701 (2010).

46. P. Horng, M. R. Brindza, R. A. Walker and J. T. Fourkas "Behavior of Organic Liquids at Bare and Modified Silica Interfaces" J. Phys. Chem. C 114 394-402 (2010).

45. F. Ding, Q. Zhong, M. R. Brindza, J. T. Fourkas, and R. A. Walker "Ti :sapphire, broadband vibrational sum-frequency generation spectrometer with a counter-propagating geometry" Optics Express, 17 14665-14675 (2009).

44. A. R. Siler, M. R. Brindza, and R. A. Walker "Hydrogen bonding molecular ruler surfactants as probes of specific solvation at liquid/liquid interfaces" Analytical and Bioanalytical Chemistry, 395 1063-1069 (2009). (Invited article)

42. M. R. Brindza and R. A. Walker "Evaluating Solvation Mechanisms at Polar Solid Surfaces with Nonlinear Optical Spectroscopy" J. Am. Chem. Soc. 131 6207-6214 (2009).

41. W. H. Steel, J. B. Foresman, Y. Y. Lau, D. K. Burden, and R. A. Walker, "Solvation of Nitrophenol Isomers: Consequences for Solute Electronic Structure and Water/Alkane Partitioning" J. Phys. Chem. B, 113 759-766 (2009).

40. M. B. Pomfret, B. C. Eigenbrodt, and R. A. Walker, "Interfacial Resistivity of Yttria Stabilized Zirconia in Operating Solid Oxide Fuel Cells" Electrochemical Society Transactions, 11 (27) 111-120 (2008).

39. M. B. Pomfret, J. C. Owrutsky, and R. A. Walker "A Mechanistic Understanding of Solid Oxide Fuel Cell Chemistry Through In-Situ Raman Spectroscopy" Electrochemical Society Transactions, 11 (27) 99-109 (2008).

38. S. Z. Can, C. F. Chang and R. A. Walker "Spontaneous formation of DPPC monolayers at aqueous/vapor interfaces and the impact of charged surfactants" Biochmica et Biophysica Acta – Biomembranes, 1778 2368-2377 (2008).

37. M. B. Pomfret, J. Marda, G. S. Jackson, B. W. Eichhorn, A.M. Dean and R. A. Walker "Hydrocarbon fuels in solid oxide fuel cells: In-situ Raman studies of graphite formation and oxidation" J. Phys. Chem. C 112, 5232-5240 (2008).

36. J. T. Fourkas, R. A. Walker, E. Gershgoren, and S. Z. Can "Effects of Reorientation in Vibrational Sum Frequency Spectroscopy" J. Phys. Chem. C 111, 8902-8915 (2007). ( invited article for Kenneth Eisenthal Festschrift)

35. M. B. Pomfret, J. C. Owrutsky, and R. A. Walker "In-situ Studies of Fuel Oxidation in Solid Oxide Fuel Cells" Analytical Chemistry 79 2367-2372 (2007) (Featured in Nature (highlights) 446 (2007) p. 4; featured on cover of Analytical Chemistry, 78 (6) (2007))

34. S. Z. Can, D. D. Mago, O. Esenturk and R. A. Walker "Balancing Hydrophobic and Hydrophilic Forces at the Water/Vapor Interface: Surface Structure of Soluble Alcohol Monolayers" J. Phys. Chem C 111, 8739-8748 (2007). ( invited article for Kenneth Eisenthal Festschrift).

33. W. M. Heiserman, S. Z. Can, R. A. Walker, T. H. Begley, and W. X. Limm, "Interfacial behavior of common food contact polymer additives" J. Colloid and Interface Science, 311 587-594 (2007).

32. M. B. Pomfret, J. C. Owrutsky, and R. A. Walker, "High Temperature Raman Spectroscopy of Solid Oxide Fuel Cell Materials and Processes" J. Phys. Chem. B 110 17305-17308 (2006). (Featured in Photonics Spectra, November, 2006).

31. O. Esenturk and R. A. Walker, "Surface Vibrational Structure at Alkane Liquid/Vapor Interfaces" J. Chem. Phys. 125 Art. No. 174701 (2006).

30. S. Z. Can, D. D. Mago, and R. A. Walker, "Structure and Organization of Hexadecanol Isomers Adsorbed to the Air/Water Interface" Langmuir 22 8043-8049 (2006).

29. M. B. Pomfret, A. M. Sukeshini, O. Demircan and R. A. Walker "Fuel Oxidation Efficiencies and Exhaust Composition in Solid Oxide Fuel Cells" Environ. Sci. Technol . 40 5574-5579 (2006).

28. T. H. Begley, K. White, P. Honigfort, M. L. Twaroski, R. Neches, and R. A. Walker, "Perfluorochemicals: Potential sources of and migration from food packaging" Food Additives and Contaminants 22 1023-1031 (2005).

27. C. L. Beildeck, Milton J. Liu, Michael R. Brindza, and R. A. Walker, "Solvation of p‑nitrophenol at a water/ alkane interface: The roles of ionic strength and salt identity" J. Phys. Chem. B. 109 14604-14610 (2005).

26. A. Mary Sukeshini, Bahman Habibzadeh, Benjamin P. Becker, Michael B. Pomfret, Oktay Demircan, Robert A. Walker, Bryan W. Eichhorn, and Gregory S. Jackson, "CO and CH4 Electrochemical Oxidation on Ni Patterned Anodes" Proceedings of SOFC-IX Symposium Electrochemical Society, 1294-1302 (2005).

25. M. B. Pomfret, C. Stoltz, B. Varughese, and R. A. Walker, "Structural and Compositional Characterization of Yttria Stabilized Zirconia (YSZ): Evidence of Surface Stabilized, Low Valence Metal Species" Analytical Chemistry 77, 1791-1795 (2005).

24. C. L. Beildeck, W. H. Steel, and R. A. Walker, "Surface Charge Effects on Solvation across Liquid/Liquid and Model Liquid/Liquid Interfaces" Faraday Discussions, 129 69‑80 (2005).

23. O. Esenturk and R. A. Walker, "Surface Structure at Hexadecane and Halo-hexadecane Liquid/Vapor Interfaces" J. Phys. Chem. B, 108, 10631-10635 (2004).

11. W. H. Steel, C. L. Beildeck, and R. A. Walker, "Solvent Polarity across Strongly Associating Interfaces" J. Phys. Chem. B, 108, 16107-16116 (2004).

10. W. H. Steel, Y. Y. Lau, C. L. Beildeck and R. A. Walker, "Solvent Polarity Across Weakly Associating Liquid/Liquid Interfaces" J. Phys. Chem. B, 108, 13370-13378 (2004).

9. C. L. Beildeck, W. H. Steel, and R. A. Walker, "Cationic Molecular Rulers: Synthesis, Characterization and Intramolecular Complications" Langmuir, 19, 4933-4939 (2003).

8. O. Esenturk and R. A. Walker, " Indoline – A Versatile Probe of Specific and Non-specific Solvation Forces" Phys. Chem. Chem. Phys., 5, 2020-2026 (2003).

7. W. H. Steel and R. A. Walker, "Measuring Liquid/Liquid Interfacial Width with Molecular Rulers," Nature, 424, 296-299 (2003). (Featured in Chemical and Engineering News “News of the Week” 21 July, 2003, p. 4)

6. W. H. Steel and R. A. Walker, "Solvent Polarity Across an Aqueous/Alkane Interface: The Effect of Solute Identity" J. Am. Chem. Soc., 125, 1132-1133 (2003).

5. X. Zhang, W. H. Steel, and R. A. Walker, "Probing Solvent Polarity Across Strongly Associating Solid/Liquid Interfacces Using Molecular Rulers" J. Phys. Chem. B, 107, 3829-3836 (2003).

4. X. Zhang, M. M. Cunningham, and R. A. Walker, "Solvent Polarity at Polar Solid Surfaces – The Role of Solvent Structure," J. Phys. Chem. B, 107, 3183-3195 (2003).

3. W. H. Steel, R. Nolan, F. Damkaci, and R. A. Walker, "Molecular Rulers: New Families of Molecules for Measuring Interfacial Widths, " J. Am. Chem. Soc., 124, 4824-4831 (2002).

2. X. Zhang, O. Esenturk, and R. A. Walker, "Reduced Polarity in Protic Solvents Near Hydrophobic Solid Surfaces," J. Am. Chem. Soc., 123, 10768-10769 (2001).

1. X. Zhang and R. A. Walker, "Discrete Partitioning of Solvent Permittivity at Liquid - Solid Interfaces," Langmuir, 17, 4486-4489 (2001).