All publications from the Walker Lab

148. Kim, K. S.; Gilburd, L.; Ho, K.; Trajanoski, D.; Maiti, A.; Halverson, D.; van der Velden, L.; de Beer, S.; Walker, G. C. “The Effect of Adjacent Materials on the Propagation of Phonon Polaritons in Hexagonal Boron Nitride“, J Phys. Chem. Lett., 2017.

147. Gilburd, L.; Kim, K. S.; Ho, K.; Trajanoski, D.; Maiti, A.; Halverson, D.; de Beer, S.; Walker, G. C. “Hexagonal Boron Nitride Self-Launches Hyperbolic Phonon Polaritons”, J Phys. Chem. Lett. 2017, 8, 2158–2162. 

146. Alipour,E.; Halverson,D.; McWhirter, S.; Walker, G. C. “Phospholipid Bilayers: Stability and Encapsulation of Nanoparticles,” Ann. Rev. Phys. Chem201768, 261-283.

145. Li, H.; Walker, G. C. “Twist and Shout: Single-Molecule Mechanochemistry ACS Nano, 2017, 11, 28–3.

144. Gilburd, L.;  Xu, X. G.; Bando,Y. Golberg, D.; Walker, G C. “Surface Phonon Coupling within Boron Nitride Nanotubes Resolved by a Novel Near-Field Infrared Pump-Probe Imaging Technique”, Microsc. Microanal.2016, 22, 366-367.

143. Walker, G. C. “Nanobiotechnology: Net charge of trace proteins,” Nature Nanotechnology 201611, 739–740.

142. Gonzalez-Alvarez, M. J.; Lin, J.; Guerin, G.; Kim, K. S.; Du, V. A.; Walker, G. C.; Manners, I.; Winnik, M. A. “How a Small Modification of the Corona-Forming Block Redirects the Self-Assembly of Crystalline-Coil Block Copolymers in Solution,” Macromolecules, 201649, 7975-7984.

141. Kim, K. S.; Gunari, N.; MacNeil, D.; Finlay, J. A.; Callow, M. E.; Callow, J. C. Walker, G. C. “Aqueous-Based Fabrication of Low-VOC Nanostructured Block Copolymer Films as Potential Marine Antifouling Coatings,” ACS Appl. Mater. Interfaces 20168, 20342–20351.

140. Gilburd, L.; Xu, X. G.; Bando, Y.; Golberg, D.; Walker, G. C. “Near-Field Infrared Pump-Probe Imaging of Surface Phonon Coupling in Boron Nitride Nanotubes,” J. Phys. Chem. Lett. 2016, 7, 289–294.

139. Xu, X. G.; Gilburd, L.; Bando, Y.; Golberg, D.; Walker, G. C. “Defects and Deformation of Boron Nitride Nanotubes Studied by Joint Nanoscale Mechanical and Infrared Near-Field Microscopy,” J. Phys. Chem. C 2016, 120, 1945–1951.

138. Mondal, J.; Halverson, D.; Li, I. T. S.; Stirnemann, G.; Walker, G. C.; Berne, B. J. “How Osmolytes Influence Hydrophobic Polymer Conformations: A Unified View from Experiment and Theory,” Proc. Nat. Acad. Sci. USA 2015, 112, 9270-9275.

137. Bhowmik, D.; Mote, K. R.; MacLaughlin, C. M.; Biswas, N.; Chandra B.; Basu, J. K.; Walker, G. C.; Madhu, P. K.; Maiti, S. “Cell-Membrane-Mimicking Lipid-Coated Nanoparticles Confer Raman Enhancement to Membrane Proteins and Reveal Membrane-Attached Amyloid-β Conformation,” ACS Nano 20159, 9070–9077.

136. Navab, R.; Strumpf, D.; To, C.; Pasko, E.; Kim, K. S.; Park, C. J.; Hai, J.; Liu, J.; Jonkman, J.; Barczyk, M.; Bandarchi, B.; Wang, Y. H.; Venkat, K.; Ibrahimov, E.; Pham, N.-A.; Ng, C.; Radulovich, N.; Zhu, C.-Q.; Pintillie, M.; Wang, D.; Lu, A.; Jurisica, I.; Walker, G. C.; Gullberg, D.; Tsao, M.-S.  “Integrin α11β1 Regulates Cancer Stromal Stiffness and Promotes Tumorigenicity and Metastasis in Non-Small Cell Lung Cancer,” Oncogene 2015, 35, 1899–1908.

135. Stewart, A. F.; Gagnon, B. P.; Walker, G. C. “Forming End-to-End Oligomers of Gold Nanorods Using Porphyrins and Phthalocyanines,” Langmuir 201531, 6902-6908.

134.  Xu, X.; Gilburd, L., Walker, G. C. “Phase Stabilized Homodyne of Infrared Scattering Type Scanning Near-field Optical Microscopy,” Appl. Phys. Lett.,2014105, 263104.

133. Sarvothaman, M. K.; Kim, K. S.; Brodersen, P. M.; Walker, G. C.; Wheeler, A. R. “Dynamic Fluoroalkyl Polyethylene Glycol Co-polymers: A New Strategy for Reducing Protein Adhesion in Lab-on-a-Chip Devices,” Adv. Func. Mater., 2015, 25, 506-515

132.  Xu, X. G.; Jiang, J.-H.; Gilburd, L.; Rensing, R. G.; Burch, K. S.; Zhi, C.; Bando, Y.; Golberg, D.; Walker, G. C.  “Mid-Infrared Polaritonic Coupling Between Boron Nitride Nanotubes and Graphene,” ACS Nano20148, 11305–11312.

131.  Feng, C.; Gonzalez-Alvarez, J. M.; Song, Y.; Li, I.; Zhao, G.; Molev, G.; Guerin, G.; Walker, G. C., Scholes, G. D.; Manners, I.; Winnik, M.A. “Synthesis, Self-assembly and Photophysical Properties of Oligo(2,5-dihexyloxy-1,4-phenylene vinylene)-block-poly(ethylene glycol),” Soft Matter, 2014, 10, 8875 – 8887.

130. Ghamsari, B. G.;  Xu, X. G.; Gilburd, L.;  Walker, G. C.; Berini, P. “Mid-Infrared Surface Phonon Polaritons  in Boron-Nitride Nanotubes,” J. Optics, 2014, 16,114008.

129. Klinkova, A.; Thérien-Aubin, H.; Ahmed, A. ; Nykypanchuk, D.; Choueiri, R. ; Gagnon, B.; Muntyanu,  A.; Gang, O.;  Walker, G. C.; Kumacheva, E. “Structural and Optical Properties of Self-Assembled Chains  of Plasmonic Nanocubes,”  Nano Letters2014,  14,  6314–6321.

128.  Xu, X. G.; Ghamsari, B. G.; Jiang, J-H.; Gilburd, L.; Andreev, G. O.;  Zhi, C., Bando, J.; Golberg, D.;  Berini,P.; Walker, G. C. “One-dimensional Surface Phonon Polaritons in Boron Nitride Nanotubes,” Nature Comm.20145, 4782.

127. Stewart, A.F.; Lee, A.; Ahmed, A.; Ip, S.; Kumacheva, E.; Walker, G.C. “Rational Design for the Controlled Aggregation of Gold Nanorods via Phospholipid Encapsulation for Enhanced Raman Scattering,” ACS Nano20148, 5462-5467.

126.  Jia, L.; Zhao, G.; Shi, W.; Coombs, N.; Gourevich, I.; Walker, G.; Guerin, G.; Manners, I.; Winnik, M.  “A Design Strategy for the Hierarchical Fabrication of Colloidal Hybrid Mesostructures,” Nature Comm20145, 3882.

125.  Molev, G.; Lu, Y.; Kim, K.S.; Majdalani, I.C.; Guerin, G.; Petrov, S.; Walker, G.; Manners, I.; Winnik, M.A.  “Organometallic-Polypeptide Diblock Copolymers: Synthesis by Diels-Alder Coupling and Crystallization-Driven Self-Assembly to Uniform Truncated Elliptical Lamellae,” Macromolecules201447, 2604-2615.

124. Bhowmik, D.; MacLaughlin, C. M; Walker, G. C.; Maiti, S. “pH Changes the Aggregation Propensity of Amyloid-β Without Altering the Monomer Conformation,” Chem Phys Phys Chem, 2014, 16, 885-889.

123.  Sullan, R.M.A.; Shi, W.; Chan, H.; Li, J.K.; Walker, G.C. “Mechanical Stability of Phase-Segregated Multicomponent Lipid Bilayers Enhanced by PS-b-PEO Diblock Copolymers,” Soft Matter, 2013, 9, 6245-6253.

122. Pirotta, S.; Xu, X.; Delfan, A.; Mysore, S.; Maiti, S.; Dacarro, G.; Patrini, M.; Galli, M.; Guizzetti, G.; Bajoni, D.; Sipe, J.; Walker, G.C.; Liscidini, M.  “Surface-Enhanced Raman Scattering in Purely Dielectric Structures via Bloch Surface Waves,” J. Phys. Chem. C, 2013, 117, 6821-6825.

121. Qian, J.; Lu, Y.; Chia, A.; Zhang, M.; Rupar, P. A.; Gunari, N.; Walker, G. C.; Cambridge, G.; He, F.; Guerin, G.; Manners, I.; Winnik, M. A.  “Self-Seeding in One Dimension: A Route to Uniform Fiber-like Nanostructures from Block Copolymers with a Crystallizable Core-Forming Block,” ACS Nano20137, 3754-3766.

120. Xu, X. G.; Tanur, A. E.; Walker, G. C.  “Phase Controlled Homodyne Infrared Near-Field Microscopy and Spectroscopy Reveal Inhomogeneity within and among Individual Boron Nitride Nanotubes,” J. Phys. Chem. A, 2013, 117, 3348-3354.

119.  Zamecnik, C.; Ahmed, A.; Walters, C.; Gordon, R.; Walker, G. C. “SERS using Lipid Encapsulated Plasmonic Nanoparticles and J-Aggregates to Create Locally Enhanced Electric Fields,” J. Phys. Chem. C, 2013, 117, 1879-1886.

118.  Kumachev, A.; Tumarkin, E.; Walker, G. C.; Kumacheva, E. “Characterization of the Mechanical Properties of Microgels Acting as Cellular Microenvironments,”Soft Matter, 2013, 9, 2959-2965.

117.  MacLaughlin, C.; Mullaithilaga, N.; Yang, G.; Ip, S.; Wang, C.; Walker, G. C. “Surface Enhanced Raman Scattering Dye Labeled Au Nanoparticles for Triplexed Detection of Leukemia and Lymphoma Cells and SERS Flow Cytometry,” Langmuir, 2013, 29, 1908-1919.

116.  Tanur, A.; Wang, J.; Leela M.R.A.; Lamont, D.; Yap, Y. K.; Walker, G. C. “Diameter-Dependent Bending Modulus of Individual Multiwall Boron Nitride Nanotubes,” J. Phys. Chem. C., 2013, 117, 4618-4625.

115. Paulite, M.; Walker, G. C.; Zenobi, R. “Full Spectroscopic Tip-enhanced Raman Imaging of Single Nanotapes Formed from Beta-amyloid(1-40) Peptide Fragments,” ACS Nano, 20137, 911-920.

114.  Velasco, D.; Chau, M.; Therien-Aubin, H.; Kumachev, A.; Tumarkin, E.; Walker, G. C.; Jia, Z.; Monteiro, M.; Kumacheva, E.  “Thermoreversible and Nanofibrillar Micellar Microgels,” Soft Matter, 2013, 9, 2380-2383.

113.  MacLaughlin, C.M.; Parker, E.P.K.; Wang, C.; Walker, G.C. “Evaluation of SERS Labeling of CD20 Using Optical Microscopy and Fluorescence Flow Cytometry,” Nanomedicine, 2013, 9, 55–64.

112. MacLaughlin, C.M., Parker, E. P. K., Wang, C., Walker, G.C.  “Polymer Coated Surface-enhanced Raman Scattering (SERS) Gold Nanoparticles for Multiplexed Labeling of Chronic Lymphocytic Leukemia Cells,” Frontiers in Biological Detection: From Nanosensors to Systems IV. Edited by Miller, Benjamin L.; Fauchet, Philippe M. Proceedings of the SPIE, 2012, 8212 821203-821203-11.

111. Ip, S. Y.; MacLaughlin, C. M.; Mullaithilaga, N.;  Joseph, M.; Wala, S.; Wang, C.; Walker, G. C. “Lipid-encapsulation of Surface Enhanced Raman Scattering (SERS) Nanoparticles and Targeting to Chronic Lymphocytic Leukemia (CLL) Cells,” Frontiers in Biological Detection: From Nanosensors to Systems IV. Edited by Miller, Benjamin L.; Fauchet, Philippe M. Proceedings of the SPIE, 2012, 8212, 821204-821204-12.

110. Reddy, A. M. R.; Gupta, B.K.; Narayanan, T. N.; Martí, A.; Ajayan, P.; Walker, G. C. “Probing on Time-Resolved and Photoluminescence Spectroscopy of Ni Encapsulated Ferromagnetic Boron Nitride Nanotubes,” J. Phys. Chem. C, 2012, 116, 12803–12809.

109.  Li, I.T.S.; Walker, G.C. “Single Polymer Studies of Hydrophobic Hydration,” Accounts of Chemical Research, 2012, 45, 2011-2021.

108. Li, I.T.S.; Walker, G.C. “Signature of Hydrophobic Hydration in a Single Polymer,” Proceedings of the National Academy of Sciences, 2011, 108, 16527-16532.

107. Grozea, C.; Li, I.T.S.; Grozea, D.; Walker, G.C. “Microdomain Orientation of Diblock Copolymer Ultrathin Films Solvent Annealed at Low Temperatures,”Macromolecules, 2011, 44, 3901-3909.

106. Ip, S.; MacLaughlin, C. M.; Gunari, N.; Walker, G. C. “Phospholipid membrane encapsulation of nanoparticle for surface enhanced Raman scattering,” Langmuir,2011, 27, 7024-7033.

105. Paulite, M.; Fakhraai, Z.; Li, I.; Gunari, N.; Tanur, A.; Walker, G. “Imaging Secondary Structure of Individual Amyloid Fibrils of a β2 microglobulin Fragment using Near-Field Infrared Spectroscopy,” J. Am. Chem. Soc, 2011, 133, 7376-7383.

104. Gunari, N.; Brewer,L. H.; Bennett, S. M; Sokolova, A.; Kraut, N. D.; Finlay, J. D.; Meyer, A. E.; Walker, G. C.; Wendt, D.E; Callow, M. E.; Callow, J. A.; Bright, F. V.; Detty, M. R. “The Control of Marine Biofouling on Xerogel Surfaces with Nanometer-scale Topography,” Biofouling, 2011, 27, 137-149.

103. Li, J. K; Sullan, R. M. A.; Zou, S.; Li, I. T. S.; Sun, Y.; Walker, G. C. “Polymer Nanomechanics,” in Polymer Science: A Comprehensive Reference, Matyjaszewski, K.; Möller, M. eds. (London: Academic Press), 2012, 377-404.

102. Wang, M.; Zhang, M.; Li, J..; Kumar, S.; Walker, G.C.; Scholes, G.D.; Winnik, M.A. “Self-Assembly of Colloidal Quantum Dots on the Scaffold of Triblock Copolymer Micelles,” ACS Applied Materials & Interfaces, 2010, 2, 3160-3169.

101. Rossky P.J.; Walker G.C. “Paul F. Barbara (1953-2010),” SCIENCE, 2010, 330, 1191-1191.

100. Finlay, J. A.; Bennett, S. M.; Brewer, L. A..; Sokolova, A.; Clay, G.; Gunari, N.; Meyer, A. E.; Walker, G. C.; Wendt, D. E.; Callow, M. E.; Callow, J. A.; Dettey, M. R. “Barnacle Settlement and the Adhesion of Protein and Diatom Microfouling to Xerogel Films with Varying Surface Energy and Water Wettability,” Biofouling, 2010,26, 657-666.

99. Raz, N.; Li, J.; Fiddes, L.; Tumarkin, E.; Walker, G.; Kumacheva, E. “Microgels with an Interpenetrating Network Structure as a Model System for Cell Studies,”Macromolecules, 2010, 43, 7277-7281.

98. Sullan, R.M.A; Li, J.K.; Hao, C.; Walker, G.C.; Zou, S. “Cholesteral Dependant Nanomechanical Stability of Phase-Segregated Multicomponent Lipid Bilayers,”Biophysical Journal, 2010, 99, 507-516.

97. Ip, S.; Li, I.; Walker, G. C. “Phase-segregation of untethered zwitterionic model lipid bilayers observed on mercaptoundecanoic acid-modified Au surfaces by AFM imaging and force mapping,” Langmuir, 2010, 26, 11060-11070.

96. Kofke, M. J; Waldeck, D H.; Walker, G.C. “Composite nanoparticle nanoslit arrays: A novel platform for LSPR mediated subwavelength optical transmission,” Opt. Lett., 2010, 18, 7705-7713.

95. Li, I.T.S.; Walker, G.C. “Interfacial Free Energy Governs Single Polystyrene Chain Collapse in Water and Aqueous Solutions,” J. Amer. Chem. Soc., 2010, 132, 6530-6540.

94. Stebounova, L.; Paulite, M.; Fakhraai, Z.; Walker, G.C. “Biological imaging using near-field scanning microscopy,” in Biological Nanoscience, Vol. 2 , Walker, G. C ; Krueger, B., eds., of Comprehensive Nanoscience and Nanotechnology, Andrews, D.; Scholes, G.; Wiederrecht, G, eds. (Elsevier, London), 2010; 263-285.

93. Nguyen, C.; Nguyen, J.; Rutledge, S.; Zheng, J.; Wang, C.; Walker, G. “Detection of Chronic Lymphocytic Leukemia Cell Surface Markers using Surface Enhanced Raman Scattering Gold Nanoparticles,” Cancer Lett., 2010, , 292, 91-97.

92. Reddy, A.L.M.; Tanur, A. E.; Walker, G. C. “Synthesis and hydrogen storage properties of different types of boron nitride nanostructures,” Int. J. Hydrogen. Energy,2010, 35, 4138-4143.

91. Bennet, S. M.; Finlay, J. A..; Gunari, N., Wells, D. D. Meyer, A. E.; Walker, G. C.; Callow, M. E.; Callow, J. A.; Bright, F. V.; Detty, M. R. “The Role of Surface Energy and Water Wettability in Aminoalkyl/ Fluorocarbon/Hydrocarbon-Modified Xerogel Surfaces in the Control of Marine Biofouling,” Biofouling, 2010, 26, 235-246.

90. Tanur, A. E.; Gunari, N.; Sullan, R. M. A; Kavanagh, C. J., Walker, G. C. “Insights into the composition, morphology, and formation of the calcareous shell of the serpulid Hydroides dianthus,” J. Str. Biol., 2010, 169, 145–160.

89. Weinman, C. J.; Gunari, N.; Krishnan, S.; Don,R.; Paik, M. Y.; Sohn, K. E.; Walker, G. C.;Kramer, E. J; Fischer, D. A.;. Ober, C. K, “Protein Adsorption Resistance of Anti-Biofouling Block Copolymers Containing Amphiphilic Side Chains,” Soft Matter, 2010, 6, 3237-3243.

88. Ip, S.; MacLaughlin, C. M.; Nguyen, Collin, T.; Walker, G. C. “Photonic Nanoparticles for Cellular and Tissular Labeling,” in Biological Nanoscience, Vol. 2 , Walker, G. C ; Krueger, B., eds., of Comprehensive Nanoscience and Nanotechnology, Andrews, D.; Scholes, G.; Wiederrecht, G, eds. (Elsevier, London), 2010; 59-104.

87. Grozea, C. M.; Walker, G. C. “Recent Approaches in Designing Surfaces to Deter Marine Biofouling,” Soft Matter, 2009, 5, 4088 – 4100.

86. Paulite M.; Fakhraai Z.; Akhremitchev B. B.; Walker G. C. “Assembly, Tuning and Use of an Apertureless Near-field Infrared Near Field Microscope for Protein Imaging,” Journal of Visualized Experiments, 2009, 33. http://www.jove.com/index/details.stp?id=1581, doi: 10.3791/158.

85. Grozea, C.; Gunari, N.; Finlay, J.; Grozea, D.; Lu, Z.-H.; Callow, M.; Callow, J.; Walker, G. “Water-Stable Diblock Polystyrene-block-Poly(2-vinyl pyridine) and Diblock Polystyrene-block-Poly(methyl methacrylate) Cylindrical Patterned Surfaces Inhibit Settlement of Zoospores of the Green Alga Ulva,” Biomacromolecules,2009, 10, 1004–1012.

84. Sullan, R.M.A.; Tanur, A, Chan, Y.; Dickenson, G. H.; Orihuela, B.; Rittschof, D.; Walker, G. C. “Nanoscale structures that contribute to the toughness of barnacle cement,” Biofouling, 2009, 25, 263–275.

83. Kofke, M.; Waldeck, D.; Ip, S.; Fakhraai, Z.; Walker, G. C. “The effect of periodicity on the extraordinary optical transmission of annular aperture arrays,” Applied Physics Letters, 2009, 94, 023104.

82. Cheung, J. W. C.; Walker, G. C. “Immuno-Atomic Force Microscopy Characterization of Adsorbed Fibronectin,” Langmuir, 2008, 24, 13842–13849.

81. Wang, M.; Zou, S.; Walker, G. C.; Winnik, M. “A Water-Soluble, pH-Responsive Molecular Brush of Poly(N,N-dimethylaminoethyl methacrylate) Grafted Polythiophene,” Macromol., 2008, 41, 6993-7002.

80. Gunari, N.; Walker, G. “Nanomechanical Fingerprints of Individual Blocks of a Diblock Copolymer Chain,” Langmuir, 2008, 24, 5197-5201.

79. Mueller, K.; Yang, X.; Paulite, M.; Fakhraai, Z.; Walker, G. “Chemical Imaging of the Surface of Self-Assembled Polystyrene-Poly(methyl methachrylate) Diblock Copolymer Films Using Apertureless Near-Field IR Microscopy,” Langmuir, 2008, 24, 6946-6951.

78. Li, J.; Zou, S.; Rider, D,; Manners, I.; Walker, G. C. “Differential Conductivity in Self-Assembled Nanodomains of a Diblock Copolymer Using Polystyrene-block-poly(ferrocenylethylmethylsilane),” Advanced Materials, 2008, 20, 1989-1993.

77. Tivanski, A.; Walker, G. C.; Li. J. “Pressure-Induced Restructuring of a Monolayer Film Nanojunction Produces Threshold and Power Law Conduction,” Langmuir,2008, 24, 2288-2293.

76. Nie, Z.; Fava, D., Kumacheva, E.; Zou, S.; Walker, G. C; Rubinstein, M. “Self-assembly of Metal-Polymer Analogues of Amphiphilic Triblock Copolymers,” Nature Materials, 2007, 6, 609-614.

75. Gunari, N; Balazs, A.; Walker, G. C. “Force Induced Globule-Coil Transition in Single Polystyrene and Polymethylmethacrylate Chains in Water,” J. Am. Chem. Soc., 2007, 129, 10046-10047.

74. Zhang, H.; Tumarkin, E.; Sullan, R. M. A.; Walker, G. C.; Kumacheva, E. “Exploring Microfluidic Routes to Microgels of Biological Polymers,” Rapid Macromol. Comm., 2007, 28, 527-538.

73. Romanov, V.; Walker, G. C. “Infrared Near-Field Detection of a Narrow Resonance Due to Molecular Vibrations in a Nanoparticle,” Langmuir, 2007, 23, 2829-2837.

72. Zou, S.; Hong, R.; Emrick, T.; Walker, G. C. “Ordered CdSe Nanoparticles within Self-Assembled Block Copolymer Domains on Surfaces,” Langmuir, 2007, 23, 1612-1614.

71. Zhang, H.; Tumarkin, E.; Peerani, R.; Nie, Z.; Sullan, R. M. A.; Walker, G. C.; Kumacheva, E. “Microfluidic Production of Biopolymer Microcapsules with Controlled Morphology,” J. Am. Chem. Soc., 2006, 128, 12205-12210.

70. Zou, S. Tivanski, A. Li, J. Walker, G. “Nanoforces in conjugated polymer thin films and self-assembled monolayers by conducting probe AFM,” ACS Polymer Preprints, 2006, 47, 402.

69. Gunari, N. Balazs, A. Walker, G. “Stretching Behavior of Single Diblock Copolymer Chains in Different Solvent Conditions,” ACS Polymer Preprints, 2006, 47, 781-782.

68. Zou, S.; Sullan, R.; Walker, G. “Unfolding and Refolding Behavior of Maltose-Binding Protein by AFM,” ACS Polymer Preprints, 2006, 47, 359.

67. Stebounova, L.; Chen, F.; Schlesinger, T. E.; Ip, S. Walker, G. C. “Field localization in very small aperture lasers studied by apertureless near-field microscopy,”Applied Optics, 2006, 45, 6192-6197.

66. Tivanski, A. V.; Walker, G. C. “Ferrocenylundecanethiol Self-Assembled Monolayer Charging Correlates with Negative Differential Resistance Measured by Conducting Probe Atomic Force Microscopy,” J. Am. Chem. Soc., 2005, 127, 7647-7653.

65. Sun, Y.; Walker, G. C. “Viscoelastic Response of Poly-(dimethylsiloxane) in Adhesive Interaction with AFM tips,” Langmuir, 2005, 21, 8694-8702.

64. Al-Maawali, S.; Bemis, J. E.; Walker, G. “Single-Molecule AFM Study of Polystyrene Grafted at Gold Surfaces,” J. Adhesion, 2005, 81, 1101-1118.

63. Walker, G. C.; Sun, Y.; Guo, S.; Finlay, J. A.; Callow, M. E.; Callow, M. A. “Surface Mechanical Properties of the Spore Adhesive of the Green Alga Ulva,” J. Adhesion, 2005, 81, 1101-1118.

62. Tivanski, A. V.; He, Y,; Borguet, E.; Walker, G. C.; Waldeck, D. H. “Conjugated Thiol Linker for Enhanced Electrical Conduction of Gold-Molecule Contacts,” J. Phys. Chem. B, 2005, 109, 5398-5402.

61. Meadows, P. Y.; Walker, G. C. “Force Microscopy Studies of Fibronectin Adsorption and Subsequent Cellular Adhesion to Substrates with Well-Defined Surface Chemistries,” Langmuir, 2005, 21, 4096-4107.

60. Meadows, P. Y.; Bemis, J. E., Walker, G. C. “Quantifying Adhesion Bond Parameters to Distinguish Interactions of Hydrophilic and Hydrophobic Blocks of Polystyrene-Poly-2-vinylpyridine with a Silicon Nitride Surface,” J. Am. Chem. Soc., 2005, 127, 4136-4137.

59. Meadows, P. Y.; Bemis, J. E.; Maawali, S.; Walker, G. C. “Probing Single Molecules using AFM,” in Applications of Scanned Probe Microscopy to Polymers, Batteas, J. D.; Walker, G. C.; Michaels, C., eds. (Columbus: ACS), 2005, 148-161.

58. Akhremitchev, B. B.; Stebounova, L.; Sun, Y.; Walker, G. C. “Apertureless Near-Field Infrared Microscopy for Chemical Imaging of Thin Films” in Applications of Scanned Probe Microscopy to Polymers, Batteas, J. D.; Walker, G. C.; Michaels, C., eds. (Columbus: ACS), 2005, 51-64.

57. Sun, Y.; Guo, S.; Walker, G. C.; Kavanagh, C. J.; Swain, G. W. “Surface Elastic Modulus of Barnacle Adhesive and Release Characteristics from Silicone Surfaces,” Biofouling, 2004, 20, 279-289.

56. Stebounova, L.; Romanov, S.; Akhremitchev, B. B.; Walker, “Near Field Infrared Microscopy of Polymer Surfaces,” SPE, 2004, 2364 – 2368.

55. Tivanski, A.; Walker, G. C. “The Role of Adhesion Forces in Nanoscale Measurements of Conductive Properties of Organic Surfaces using Conductive Probe AFM,” Proc. SPIE, 2004, 5513, 14-21.

54. Sun, Y.; Akhremitchev, B. B., Walker, G. C. “Using the Adhesive Interaction between Atomic Force Microscopy Tips and Polymer Surfaces to Measure the Elastic Modulus of Compliant Samples,” Langmuir, 2004, 20, 5837-5845.

53. Meadows, P. Y.; Bemis, J. E.; Walker, G. C. “Single Molecule Force Spectroscopy of Isolated and Aggregated Fibronectin Proteins on Negatively Charged Surfaces in Aqueous Liquids,” Langmuir, 2003, 19, 9566-9572.

52. Chen, F.; Stebounova, L.; Itagi, A.; Akhremitchev, B. B.; Bain, J. A. ; Stancil, D. D.; Walker, G. C.; Schlesinger, T.E. “Imaging of Optical Field Confinement in Ridge Waveguides Fabricated on a Very Small Aperture Laser (VSAL),” Appl. Phys. Lett., 2003, 83, 3245-3247.

51. Tivanski, A.; Wang, C.; Walker, G. C. “Vibrational Mode Coupling to Ultrafast Electron Transfer in [(CN)5OsCNRu(NH3)5]- Studied by Femtosecond Infrared Spectroscopy,” J. Phys. Chem. A, 2003, 107, 9051-9058.

50. Akhremitchev, B. B.; Bemis, J. E.; Al-Maawali, S.; Sun, Y.; Stebunouva, L.; Walker, G. C., “Application of Scanning Force and Near Field Microscopies to the Characterization of Minimally Adhesive Polymer Surfaces,” Biofouling, 2003, 19(1), 99-104.

49. Stebunouva, L.; Akhremitchev, B.; Walker, G. C. “Enhancement of the weak scattered signal in apertureless near-field scanning infrared microscopy,” Rev. Sci. Inst., 2003, 74, 3670-3674.

48. Tivanski, A. V.; Bemis, J. E.; Akhremitchev, B. B.; Liu, H.; Walker, G.C. “Adhesion Forces in Conducting Probe Atomic Force Microscopy,” Langmuir, 2003, 19, 1929-1934.

47. Akhremitchev, B. B. and Walker, G. C. “Developing Vibrational Infrared Near Field Spectroscopy to Characterize Polymer Structures on Surfaces,” Bull. Chem. Soc. Japan, 2002, 75, 1011-1018.

46. Akhremitchev, B. B.; Sun, Y.; Stebounova, L.; Walker, G. C. “Monolayer-Sensitive Infrared Imaging of DNA Stripes Using Apertureless Near-Field Microscopy,”Langmuir, 2002, 18, 5325-5328.

45. Chen, J.; Liu, H.; Weimer, W. A.; Halls, M. D.; Waldeck, D. H.; Walker, G. C. “Noncovalent Engineering of Carbon Nanotube Surfaces by Rigid Functional Conjugated Polymers,” J. Am. Chem. Soc., 2002, 124, 9034-9035.

44. Sun, Y.; Walker, G. C. “Two-Dimensional-Self-Assembly of Latex Particles in Wetting Films on Patterned Polymer Surfaces,” J. Phys. Chem. B., 2002, 106(9); 2217-2223.

43. Akhremitchev, B. B; Walker G. C. “Apertureless Scanning Near-Field Infrared Microscopy of Rough Polymeric Surface,” Langmuir, 2001, 17, 2774-2781.

42. Akhremitchev, B. B.; Brown, H.; Walker, G. C. “Force Modulation Mapping of Plastic Embedded, Thin-sectioned Skeletal Muscle,” Micros. Microanal., 2001, 7, 32-38.

41. Al-Mawaali, S.; Bemis, J.; Akhremitchev, B. B.; Janesko, B; Walker,. G. C. “Study of Polydispersity of Grafted PDMS Surfaces Using Single Molecule Atomic Force Microscopy,” J. Phys. Chem. B, 2001, 105, 3965-3971.

40. Walker, G. C., Beratan, D. N. “Electron Transfer”, in Encyclopedia of Chemical Physics and Physical Chemistry, Eds. J. Moore and N. Spencer, (Institute of Physics Publishing, Bristol, UK, 2001). III, 2657-2680. (Invited encyclopedia article)

39. Mohney, B. K.; Petri, E.; Uvarova, V.; Walker, G. C., “Infrared and Ultraviolet‑Circular Dichroism Spectral Studies of Thermally Induced Unfolding of Apomyoglobin,” Appl. Spectr., 2000, 54 ,9-14.

38. Wang, C.; Mohney, B. K.; Akhremitchev, B. B.; Walker, G. C., “Ultrafast Infrared Spectroscopy of Vibrational States Prepared by Photoinduced Electron Transfer in (CN)5FeCNRu(NH3)5-“ J. Phys. Chem. A, 2000, 104, 4314-4320.

37. Gu, Y.; Akhremitchev, B. B.; Walker, G. C.; Waldeck, D. H. “Structural Characterization and Electron Tunneling at n-Si/SiO2/SAM/Liquid Interface,” J. Phys. Chem. B, 1999, 103, 5220-5226.

36. Akhremitchev, B. B.; Walker, G. C. “Effect of Finite Sample Thickness on Elasticity Determination Using Atomic Force Microscopy,” Langmuir,1999, 15, 5630-5643.

35. Bemis, J.; Akhremitchev, B. B.; Walker, G. C. “Single Polymer Chain Elongation by Atomic Force Microscopy,” Langmuir, 1999, 15, 2799-2805.

34. Akhremitchev, B. B.; Mohney, B. K.; Marra, K.; Chapman, T. M.; Walker, G. C. “Atomic Force Microscopy Studies of Hydration of Fluorinated Amide/Urethane Copolymer Film Surfaces,” Langmuir, 1998, 14, 3976.

33. Wang, C.; Mohney, B. K.; Williams, R.; Hupp, J. T.; Walker, G. C. “Solvent Control of Vibronic Coupling upon Intervalence Charge Transfer Excitation of (CN)5FeCNRu(NH3)5- as Revealed by Resonance Raman and Near-Infrared Absorption Spectroscopies,” J. Am. Chem. Soc., 1998, 120, 5848.

32. Zuhulina, E.; Walker, G. C.; Balazs, A. C. “Modeling the Interactions Between AFM Tips and Polymeric Substrates,” Langmuir, 1998, 14, 4615. DOI:10.1021/la980344r

31. Wang, C.; Mohney, B. K.; Walker, G. C. “Photoinduced Release of Nitric Oxide from S-nitrosoglutathione,” in Ultrafast Phenomena X, Zinth, W.; Elssasser, T.; Mourou, G.; Zewail, A., eds. (New York: Springer Verlag), 1998, 603-605. (Refereed book chapter)

30. Mohney, B. K.; Walker, G. C. “Conformational Restriction of Cysteine-Bound NO in Bovine Serum Albumin Revealed by Circular Dichroism,” J. Am. Chem. Soc.,1997, 119, 9311.

29. Wang, C.; Akhremitchev, B. B.; Walker, G. C. “Femtosecond Infrared and Visible Spectroscopy of Photoinduced Intermolecular Electron Transfer Dynamics and Solvent-Solute Reaction Geometries: Coumarin 337 in Dimethylaniline,” J. Phys. Chem. A, 1997, 101, 2735.

28. Wang, C.; Mohney, B. K.; Akhremitchev, B. B.; Walker, G. C. “Femtosecond IR Spectroscopy of Optically Excited Molecules,” in Time-Resolved Vibrational Spectroscopy VII, Woodruff, W. ed. (Los Alamos), 1997. (Refereed book chapter)

27. Akhremitchev, B. B.; Wang, C.; Walker, G. C. “A femtosecond absorption spectrometer tunable from 50 000 to 800 cm−1: Nonlinear optics and pump/probe geometries,” Rev. Sci. Inst., 1996, 67, 3799.

26. Walker, G. C.; Hochstrasser, R. M. “Ultrafast Vibrational Spectroscopy: Methods, Theory, and Applications,” in Laser Techniques in Chemistry, Myers, A. B.; Rizzo, T. R., eds. (New York: Wiley), 1995. (Invited review chapter)

25. Tominaga, K.; Walker, G. C. “Femtosecond Experiments on Solvation Dynamics of an Anionic Probe Molecule in Methanol,” J. Photochem. Photobiol. A: Chemistry, 1995, 87, 127.

24. Diller, R.; Maiti, S.; Walker, G. C.; Cowen, B. R.; Pippenger, R.; Bogomolni; R. A.; Hochstrasser, R. M. “Femtosecond Time Resolved Infrared Study of the J-K Transition of Bacteriorhodopsin,Chem. Phys. Lett., 1995, 241, 109.

23. Maiti, S.; Walker, G. C.; Cowen, B. R.; Moser, C. C.; Dutton, P. L.; Hochstrasser, R. M. “Ultrafast Infrared Spectroscopy of Reaction Center Dynamics,” Proc. Natl. Acad. Sci., 1994, 91, 10360.

22. Walker, G. C.; Maiti, S.; Cowen, B. R.; Moser, C. C.; Dutton, P. L.; Hochstrasser, R. M. “Time Resolution of Electronic Transitions of Reaction Centers in the Infrared,” J. Phys. Chem., 1994, 98, 5778.

21. Walker, G. C.; Maiti, S.; Reid, G. D.; Wynne, K.; Pippenger, R. S.; Moser, C. C.; Cowen, B. R.; Dutton, P. L.; Hochstrasser, R. M. “Vibrational Spectroscopy in the Coherent Regime: Photosynthetic Reaction Centers,” in Ultrafast Phenomena IX, Knox, W. A; Barbara, P. F.; Mourou, G. A.; Zewail, A., eds. (New York: Springer Verlag), 1994. (Refereed book chapter)

20. Johnson, A. E.; Jarzeba, W.; Walker, G. C.; Barbara, P. F. “Ultrafast Torsional Relaxation from the Barrier Region for an Excited State Isomerization in Solution: 9-Carbonyl Anthracences,” Isr. J. Chem., 1993, 32, 199.

19. Hochstrasser, R. M.; Diller, R.; Maiti, S.; Lian, T.; Locke, B. R.; Moser, C. C.; Dutton, P. L.; Cowen, B. R.; Walker, G. C. “Ultrafast Infrared Spectroscopy of Protein Dynamics,” in: Ultrafast Phenomena VIII, eds, J. L. Martin, A. Migus, G. A. Mourou, and A. Zewail, (Springer Verlag, New York, 1993).

18. Johnson, A. E.; Levinger, N. E.; Walker, G. C.; Barbara, P. F. “Ultrafast Studies and Simulations on Direct Photoinduced Electron Transfer in the Betaines,” in: Ultrafast Phenomena VIII, eds, J. L. Martin, A. Migus, G. A. Mourou, and A. Zewail, (Springer Verlag, New York, 1993).

17. Kliner, D. A. V.; Tominaga, K.; Walker, G. C.; Barbara, P. F. “Comparison of Experimental and Theoretical Absolute Rates for Intervalence Electron Transfer,” J. Am. Chem. Soc., 1992, 114, 8323.

16. Levinger, N. E.; Johnson, A. E.; Walker, G. C.; Barbara, P. F. “Specific Excitation of the Solvent Coordinates in the S3-S1 and S1-S0 Radiationless Decay of the Betaines,” Chem. Phys. Lett., 1992, 196, 159.

15. Smith, T. P.; Zaklika, K. A.; Thakur, K.; Walker, G. C.; Tominaga, K.; Barbara, P. F. “Ultrafast Studies on Proton Transfer in Photostabilizers,” Photochem. Photobiol., A, 1992, 65, 165.

14. Akesson, E.; Levinger, N. E.; Johnson, A. E.; Walker, G. C.; DuBruil, T. P.; Barbara, P. F. “Temperature Dependence of the Inverted Regime: Electron Transfer Kinetics of Betaine-30 and the Role of Molecular Modes,” J. Chem. Phys., 1992, 96, 7859.

13. Barbara, P. F.; Walker, G. C.; Smith, T. P.; “Vibrational Modes and the Dynamic Solvent Effect in Electron and Proton Transfer,” Science, 1992, 256, 975.

12. Walker, G. C.; Akesson, E.; Johnson, A. E.; Levinger, N. E.; Barbara, P. F. “Interplay of Solvent Motion and Vibrational Excitation in Electron Transfer Kinetics: Experiment and Theory,” J. Phys. Chem., 1992, 96, 3728.

11. Tominaga, K.; Walker, G. C.; Jarzeba, W.; Barbara, P. F. “Ultrafast Charge Separation in ADMA: Experiment, Simulation and Theoretical Issues,” J. Phys. Chem.,1991, 95, 10475.

10. Tominaga, K.; Walker, G. C.; Kang, T. -J.; Barbara, P. F.; Fonsecas, T. “Reaction Rates in Phenomenological Excited State Electron Transfer Theory,” J. Phys. Chem., 1991, 95, 10485.

9. Smith, T. P.; Zaklika, K. A.; Thakur, K.; Walker, G. C.; Tominaga, K.; Barbara, P. F. “Spectroscopic Studies of Excited State Intramolecular Proton Transfer in 1-(acylamino)anthraquinones,” J. Phys. Chem., 1991, 95, 10465.

8. Akesson, E.; Walker, G. C.; Barbara, P. F. “Dynamic Solvent Effects on Electron Transfer Rates in the Inverted Regime: Ultrafast Studies on the Betaines,” J. Chem. Phys., 1991, 95, 4188.

7. Walker, G. C.; Barbara, P. F.; Doorn, S. K.; Dong, Y.; Hupp, J. T. “Ultrafast Measurements on Direct Photoinduced Electron Transfer in a Mixed-Valence Complex,”J. Phys. Chem., 1991, 95, 5712.

6. Jarzeba, W.; Walker, G. C.; Johnson, A. E.; Barbara, P. F. “Nonexponential Solvation Dynamics of Simple Liquids and Mixtures,” Chem. Phys., 1991, 152, 57.

5. Walker, G. C.; Jarzeba, W.; Kang, T. -J.; Johnson, A. E.; Barbara, P. F. “Ultraviolet Femtosecond Fluorescence Spectroscopy: Techniques and Applications,” J. Opt. Soc. Am. B, 1990, 7, 1521.

4. Papanikolas, J.; Walker, G. C.; Shamamian, V. A.; Christensen, R. L.; Baum, J. C. “Effects of Hydrogen Bonding on the Low Lying Electronic States of a Model Polyene Aldehyde,” J. Am. Chem. Soc., 1990, 112, 1912.

3. Flom, S. R.; Walker, G. C.; Lynch, L. L.; Barbara, P. F. “Degenerate Four-wave Mixing Experiments on Polyacene Quinones,” Chem. Phys. Lett. 1989, 154, 193.

2. Jarzeba, W.; Walker, G. C.; Johnson, A. E.; Kahlow, M. A.; Barbara, P. F. “Femtosecond Solvation Dynamics of Aqueous Solutions,” J. Phys. Chem. 1988, 92, 7039.

1. Barbara, P. F.; Walker, G. C. “Ultrafast Measurements on Excited State Isomerizations,” Rev. Chem. Inter., 1988, 10, 1.