William Ducker
635 Prices Fork Rd.
Blacksburg, VA 24061
Links
- Ph.D., Australian National University,1992
- B.Sc. (Hons), First Class, Australian National University, Australia, 1986
Research Interests:
Research link
- Lubrication in thin films
- Peptide, polymer and surfactant adsorption and self-assembly
- Colloidal stability
- Surface forces
- Enantioselectivity in adsorption
- Nanobubbles
- Hydrogen storage
Bacterial Interactions with Solids: Topography
We are interested in the general problem of how bacteria respond to surface topography when they adsorb. The chief application of this research is to understand how to make materials resist the formation of bacterial biofilms. Biofilms are three-dimensional collections of bacteria, usually coated in a polymer matrix, that adsorb to surfaces. These biofilms form on medical devices, such as catheters, and are a serious health problem. One possible way of delaying bacterial adsorption, surface transport and biofilm formation is to prepare a solid with surface features that are similar to the scale of the bacterium (µm). Compared to chemical treatments, or nanoscale roughness such surfaces cannot be easily “covered up” by adsorption of polymers from solution—the micron scale is just too large. Our expectation is that “topographical surfaces” will have a much longer antibiofilm lifetime or could be used in conjunction with chemical treatments. The important questions are: do they work, and which topography is optimal? In recent work, we have examined whether deposition of colloidal crystals inhibits the attachment of bacteria and the growth into biofilms.
Fluorescence images showing that when there are many bacteria (red) on a flat surface there are fewer when that surface is coated in 450 nm particles and even fewer when the surface is coated with 1550 nm particles.
SEM image of dehydrated bacteria(green)on colloidal crystal(purple) showing that the bacteria usually adsorb in the gaps between the particles.
Fluorescence Image showing bacteria in the gaps between colloidal particles (particles not shown)
Our research on the bacterium Pseudomonas Aeruginosa shows that:
- (a) fewer bacteria adsorb to colloidal crystals
- (b) the progression to a biofilm is delayed on colloidal crystals.
- (c) the bacteria that do adsorb, do so in the gaps between particles.
Publications on this topic:
Preventing Bacterial Colonization using Colloidal Crystals Kargar, M.; Ducker, W. A. J. Materials Chemistry B., 2014, 2, 5962-5971. DOI 10.1039/C4TB00835A
Antimicrobial Surfaces Using Covalently Bound Polyallylamine, Dmitri D. Iarikov, D. D.; Kargar, M.; Sahari, A.;Russel, L.; Gause, K. T.; Behkam, B.; Ducker, W. A. Biomacromolecules, 2014, 15, 169–176. DOI: 10.1021/bm401440h,
Thermal Rectifiers and Interfacial Resistance
It is well known that, whatever the medium, heat only travels from a hot object to a cold object. However, if the hot and cold object are switched, it is not obvious whether the heat will meet the same resistance going in the opposite direction. If the resistance is different, then the object is called a thermal rectifier, which is analogous to an electrical rectifier, which has a different electric resistance in opposite directions. We are currently performing research to build and understand thermal rectifiers. The main application is heat management. For example, it would be great if a house on a winter day could allow heat in but on a winter night would not allow heat out. Our research in this area also examines heat transfer in thin films.
Publication on this Topic:
The Influence of Interface Bonding on Thermal Transport through Solid–Liquid Interfaces, Harikrishna, H.; Ducker, W. A.; Huxtable, S. T. Applied Physics Letters 2013, 102, 251606.
Interfacial Nanobubbles
Recently it has been found that small bubbles exist at the interface between water and hydrophobic solids. We have been investigating the structure, chemistry and stability of these bubbles. The relationship between interfacial and bulk nanobubbles is being studied in collaboration with the company, Revalesio. Our research has focused on trying to determine whether the features really are in the gas state. In the image to the right, the bright spots show tiny air bubbles under water.
Optical images of nanobubbles. The left image is reflection interference contrast microscopy (RICM). The right image is a fluorescence image where fluorescence is quenched wherever there is water. The bright spots show air pockets that are nanobubbles.
Publications on this Topic:
Phase State of Interfacial Nanobubbles, Seo, D; German, S. R.; Mega, T. L.; Ducker. W.A., Journal of Physical Chemistry C., 2015, 119, 14262-14266
123. Fabrication of Stabilized Colloidal Crystal Monolayers, Chan, Y.-R.; Taylor, S.; Duncan, S. Mazilu, D.A., Ritter, A. L., Colloids and Surfaces A, 2017, 514, 185–191.
122. A liquid-state thermal diode, Gaddam, P.R.; Huxtable, S.T.; Ducker, W. A., International Journal of Heat and Mass Transfer, 2016.
121. Dynamics of single-stranded DNA tethered to a solid, Radiom, M.; Paul, M. R.; Ducker, W.A. Nanotechnology, 2016, 27, 255701.
120. Colloidal Crystals Delay Formation of Early Stage Bacterial Biofilms, Kargar, M.; Chang, Y.R. Hoseinabad, H.K.; Pruden, A.; Ducker, W.A. ACS Biomaterials Science & Engineering, 2016, 2, 1039-1048.
119. Forces between extended hydrophobic solids: Is there a long-range hydrophobic force? Mastropietro and Ducker, Current Opinion in Colloid & Interface Science, 2016, 22, 51–58
118. Phase State of Interfacial Nanobubbles, Seo, D.; German, S. R.; Mega, T. L.; Ducker. W.A., Journal of Physical Chemistry C., 2015, 119, 14262-14266.
117. Hydrodynamic Interactions between Two Nearly-Touching Brownian Spheres in a Stiff Potential: Effect of Fluid Inertia, Radiom, M.; Robbins, B.A.; Paul, M; Ducker, W.A., Physics of Fluids 2015, 27 , 022002.
116. The Stochastic Dynamics Of Tethered Microcantilevers In A Viscous Fluid, Robbins, B.A. Radiom, M.; Ducker, W.A.; Walz, J.Y.; Paul, M. Journal of Applied Physics, 2014, 116, 164905.
115. Effect of Gas Species on Gas−Monolayer Interactions: Tangential Momentum Accommodation, Seo, D.; Ducker, W. A., Journal of Physical Chemisty C, 2014, 118, 20275–20282.
114. Preventing Bacterial Colonization using Colloidal Crystals Kargar, M.; Ducker, W. A. J. Materials Chemistry B., 2014, 2, 5962-5971.
113. Control of Gas Flow in Narrow Channels Using an Electric Field To Modify the Flow Boundary Condition, Seo, D.; Ducker, W. A., Journal of Physical Chemistry C, 2014, 118, 7480-7488.
112. Direct Measurement of Field-Induced Polarization Forces between Particles in Air, Chiu, C.-W.; Ducker, W. A. Langmuir, 2014, 30, 140-148.
111. Antimicrobial Surfaces Using Covalently Bound Polyallylamine, Dmitri D. Iarikov, D. D.; Kargar, M.; Sahari, A.;Russel, L.; Gause, K. T.; Behkam, B.; Ducker, W. A. Biomacromolecules, 2014, 15, 169–176.
110. In Situ Control of Gas Flow by Modification of Gas-Solid Interactions, Seo, D.; Ducker, W. A., Physical Review Letters, 2013, 111, 174502.
109. Flow of Water Adjacent to Smooth Hydrophobic Solids, Bowles, A. P.; Ducker, W. A., Journal of Physical Chemistry C, 2013, 117, 14007-14013.
108. The Influence of Interface Bonding on Thermal Transport through Solid–Liquid Interfaces, Harikrishna, H.; Ducker, W. A.; Huxtable, S. T. Applied Physics Letters 2013, 102, 251606.
107. Effect of Grafted Oligopeptides on Friction, Dmitri D. Iarikov, D. D.; Ducker, W.A, Langmuir, 2013, 29, 5760–5769.
106. Gas Flows near Solids Coated with Thin Water Films, Seo, D. J.; Mastropietro, D.; Ducker, W. A. Journal of Physical Chemistry C., 2013, 117, 6235–6244.
105. Effects of surfactants on the formation and the stability of interfacial nanobubbles, Zhang, X. H.; Uddin, M. H.; Ducker, W. A.; Meada, N. Langmuir, 2012, 28, 10471–10477.
104. A Correlation Force Spectrometer for Single Molecule Measurements under Tensile Load, by Milad Radiom, Christopher D. F. Honig, John Y. Walz, Mark R. Paul and William A. Ducker, Journal of Applied Physics, 2013, 113, 013503.
103. A Pressure Gauge based on Gas Density Measurement from Analysis of the Thermal Noise of an AFM Cantilever, Seo, D.; Paul, M. R.; Ducker, W. A. Review of Scientific Instruments, 2012, 83, 055005.
102. Selective Adsorption to Particular Crystal Faces of ZnO, Nicholas, N. J.; Ducker, W. A.; Franks, G. V. Langmuir 2012, 28, 7189-7196.
101. Differential Etching of ZnO Native Planes under Basic Conditions
Nicholas, N. J.; Ducker, W. A.; Franks, G. V. Langmuir 2012, 28, 5633-5641.
100. Forces Between Hydrophobic Solids in Concentrated Aqueous Salt Solution, Mastropietro, D.; Ducker, W. A. Physical Review Letters 2012, 108, 106101.
99. Rheology of Fluids Measured by Correlation Force Spectroscopy, Radiom, M.; Robbins, B.; Honig, C. D. F.; Walz, J.Y.; Paul, M. R. Ducker, W. A. Review of Scientific Instruments,2012 83, 043908.
98. Correlations between the Thermal Vibrations of Two Cantilevers: Validation of Deterministic Analysis via the Fluctuation-Dissipation Theorem, Honig, C. D. F.; Radiom, M.; Robbins, B.; Walz, J.Y.; Paul, M. R. Ducker, W. A. Applied Physics Letters 2012, 100, 053121.
97. A deliberation on nanobubbles at surfaces and in bulk, Seddon, J. R. T.; Lohse, D.; Ducker, W. A. and Craig, V. S. J. ChemPhysChem 2012
96. The Mechanism for Hydrothermal Growth of Zinc Oxide, Nicholas, N. J.; Franks, G. V.; Ducker, W. A. CrystEngComm, 2012, 14, 1232 – 1240.
95. Gas Flow near a Smooth Plate, Bowles, A.P.; Ducker, W.A. Physical Review E, 2011, 83, 056328.
94. No-Slip Boundary Condition for Weak Solid-Liquid Interactions. Bowles A.P.; Honig, C. D. F.; Ducker, W. A. Journal of Physical Chemistry C 2011, 115, 8613-8621.
93. Enantiospecific Wetting, Rapp M.; Ducker, W. A. Journal of the American Chemical Society. 2010, 132, 18051–18053.
92. Effect of Molecularly-Thin Films on Lubrication Forces and Accommodation Coefficients in Air, Christopher D. F. Honig and William A. Ducker Journal of Physical Chemistry C, 2010, 114, 20114–20119.
91. Hindered Rotation of Water near C60 Wi, S.; Spano, J.; Ducker, W. A. Journal of Physical Chemistry C 2010, 114, 14986-14991.
90. Enantioselective Adsorption of Surfactants monitored by ATR-FTIR
Häbich, A; Qiao, G.G.; Ducker, W. A. Langmuir, 2010, 26, 13944-13953.
89. Lubrication forces in air and accommodation coefficient measured by a thermal damping method using an atomic force microscope Honig, C. D. F.; Sader, J. E. ; Mulvaney, P. E.; Ducker, W. A. Physical Review E 2010, 81, 056305.
88. Do Stable Nanobubbles Exist in Mixtures of Organic Solvents and Water?
Annette Häbich, William Ducker, Dave E. Dunstan and Xuehua Zhang
J. Phys. Chem. B, 2010, 114 6962-6967.
87. Formation of Nanodents by Deposition of Nanodroplets at the Polymer−Liquid Interface, Xuehua Zhang, Xiaoxuan Wei and William Ducker, Langmuir, 2010, 26, 4776–4781
86. Complexity in Nanoparticle Assembly and Function by Direct-Grafted Peptides, Mosse,W. K. J.; Koppens, M.L.; Gras, S. L.; Ducker, W.A.. Langmuir 2010 26, 1013-1018
85. The formation of hydrophobic films on silica with alcohols, Dion, M.; Rapp, M.; Rorrer, N.; Shin, D.-H.; Martin, S. M.; Ducker, W. A. Colloids and Surfaces A, 2010, 362, 65-70.
84. Shear flow promotes amyloid-beta fibrilization Dunstan DE, Hamilton-Brown P, Asimakis P.; Ducker, W, Protein engineering design & selection, 2009, 22, 741-746.
83. Pectins influence microfibril aggregation in celery cell walls: An atomic force microscopy study, Thimm, J. C. ,Burritt, D. J., Ducker, W.A., Melton, L.D. Journal of Structural Biology, 2009, 168, 337-344.
82. Shear-induced structure and mechanics of beta-lactoglobulin amyloid fibrils, Dunstan, D.E.; Hamilton-Brown, P.; Asimakis, P.; Ducker, W.; and Bertolini, J., Soft Matter 2009, 5, 5020-5028.
81. Contact Angle and Stability of Interfacial Nanobubbles Ducker, W. A. Langmuir, 2009, 25 8907-8910.
80. Nanoscale Patterning of Ionic Self-Assembled Multilayers, Tulpar, A.; Wang, Z.; Jang, C.-H.; Jain, V.; Heflin, J.R.; Ducker, W. A. Nanotechnology, 2009, 20, 155301‑155305.
79. Simple Method for Controlled Association of Colloidal-Particle Mixtures using pH-Dependent Hydrogen Bonding, Starck, P.; Ducker, W. A., Langmuir,2009, 25, 2114–2120.
78. Peptides Grafted from Solids for the Control of Interfacial Properties, Mosse,W. K. J.; Koppens, M.L.; Gengenbach, T. R.; Scanlon, D. B.; Gras, S. L.; Ducker, W.A.. Langmuir, 2009, 25, 1488–1494.
77. How Does Shear Affect Aβ Fibrillogenesis? Hamilton-Brown, P.; Bekard, I.;Ducker, W. A. Dunstan, D. E. Journal of Physical Chemistry. B, 2008, 112, 16249–16252.
76. Squeeze Film Lubrication in Silicone Oil: Experimental Test of the No-Slip Boundary Condition at Solid-Liquid Interfaces, Honig, C. D. F.; Ducker, W. A., Journal of Physical Chemistry C, 2008, 112, 17324-17330.
75. Approximate prediction of adhesion between two solids immersed in surfactant solution based on adsorption to an isolated solid, Lokar, W. J.; Ducker, W. A., Colloid and Surfaces A. 2008, 322, 256-260.
74. Nanobubbles at the interface between water and a hydrophobic solid, Zhang, X. H.; Quinn, A.; Ducker, W. A., Langmuir, 2008, 24, 4756-4764.
73. Influence of atomic force microscope cantilever tilt and induced torque on force measurements, Edwards, S. A.; Ducker, W. A.; Sader, J. E., Journal of. Applied Physics, 2008, 103, 064513.
72. Thin film lubrication for large colloidal particles: Experimental test of the no-slip boundary condition, Honig, C. D. F.; Ducker, W. A., Journal of Physical Chemistry C, 2007, 111, 16300-16312.
71. Interfacial Oil Droplets, Zhang, X. H.; Ducker, W. A. Langmuir, 2007, 24, 110-115.
70. Formation of Interfacial Nanodroplets through Changes in Solvent Quality, Zhang, X. H.; Ducker, W. A. Langmuir, 2007 23, 12478–12480.
69. Surface chemistry and rheology of polysulfobetaine-coated silica, Starck, P.; Mosse, W. K. J.; Nicholas, N. J.; Spiniello, M.; Tyrrell, J.; Nelson, A.; Qiao, G. G.; Ducker, W. A., Langmuir, 2007, 23, 7587-7593.
68. A Nanoscale Gas State, Zhang, X. H., Khan, A., Ducker, W.A. Physical Review Letters, 2007, 98, 136101.
67. No slip hydrodynamic boundary condition for hydrophilic particles, Honig, C. D. F.; Ducker, W. A. Physical Review Letters, 2007, 98, 028305.
66. Flip-flop in adsorbed bilayers, Khan A, Ducker WA, Mao M, Journal of Physical Chemistry B 2006, 110, 23365-23372. Times cited: 0
65. Measurement of the absolute separation for atomic force microscopy measurements in the presence of adsorbed polymer, McKee, C.T. *, Mosse, W.K.J. *, Ducker, W.A. †, Review of Scientific Instruments, 2006, 77, Art. No. 053706.
64. An atomic force microscope tip as a light source, Lulevich, V., Honig, C. *, Ducker, W.A. †, Review of Scientific Instruments, 2005, 76, Art. No. 123704.
63. Refractive index of thin, aqueous films between hydrophobic surfaces studied using evanescent wave atomic force microscopy, McKee, C.T. *, Ducker, W.A., Langmuir, 2005, 21, 12153-12159.
62. Modeling of confinement-induced phase transitions for surfactant layers on amphiphilic surfaces, Leermakers, F.A.M., Koopal, L.K., Lokar, W.J., Ducker, W.A., Langmuir, 2005, 21, 11534-11545.
61. Scanning near-field optical microscopy utilizing silicon nitride probe photoluminescence, Lulevich, V., Ducker, W.A., Applied Physics Letters, 2005, 87, Art. No. 214107.
60. Confinement-induced phase transition and hysteresis in colloidal forces for surfactant layers on hydrophobic surfaces, Koopal, L.K., Leermakers, F.A.M., Lokar, W.J., Ducker, W.A., Langmuir, 2005, 21, 10089-10095.
59. Cloning strategy for producing brush-forming protein-based polymers, Henderson, D.B., Davis, R.M., Ducker, W.A., Van Cott, K.E., Biomacromolecules, 2005, 6, 1912-1920.
58. Relationship between scattered intensity and separation for particles in an evanescent field, McKee, C.T., Clark, S.C., Walz, J.Y., Ducker, W.A., Langmuir, 2005, 21, 5783-5789.
57. Effect of Degassing and Ionic Strength on AFM Force Measurements in Octadecyltrimetylammonium Chloride Solutions, Zhang, J., Yoon, R-H., Ducker, W.A., Langmuir, 2005, 21, 5831-5841.
56. Unnatural Proteins for the Control of Surface Forces, Tulpar, A., Henderson, D.B., Mao, M., Caba, B., Davis, R.M., Van Cott, K.E., Ducker, W.A., Langmuir 2005, 21, 1497-1506.
55. Confinement-induced phase behavior and adsorption regulation of ionic surfactants in the aqueous film between charged solids, Lokar, WJ, Koopal, LK, Leermakers, F.A.M, Ducker, W.A., Journal of Physical Chemistry B 2004, 108, 15033-15042.
54. Atomic force microscopy colloid-probe measurements with explicit measurement of particle-solid separation, Clark, S.C, Walz, J.Y, Ducker, W.A., Langmuir 2004, 20, 7616-7622.
53. Forces between glass surfaces in mixed cationic-zwitterionic surfactant systems, Lokar, W.J, Ducker, W.A., Langmuir 2004, 20 (11): 4553-4558.
52. Self-consistent field analysis of ionic surfactant adsorption regulation in the aqueous film between two neutral solids, Lokar, W.J., Koopal, L.K., Leermakers, FAM., Ducker, W.A., Journal of Physical Chemistry B 2004, 108, 3633-3643.
51. Is there a thin film of air at the interface between water and smooth hydrophobic solids?; Mao, M., Zhang, J., Yoon, R., Ducker, W.A., Langmuir 2004, 20, 1843-1849.
50. Surfactant Adsorption at Solid-Aqueous Interfaces Containing Fixed Charges; Experiments revealing the role of Surface Charge Density and Surface Charge Regulation. Tulpar, A; Ducker, WA, Journal of Physical Chemistry B. 2004, 108 1667-1676.
49. Proximal Adsorption at Glass Surfaces: Ionic Strength, pH, Chain length Effects, Lokar, W. J. Ducker, W. A. 2004, 20, 378-388.
48. Surfactant self-assembly at the barite-solution interface, Bokern, D. G., Ducker, W.A., Hunter, K. A. Mcgrath, K. M. Colloid Surface A 2003, 229, 43-53.
47. Exchange Rates and Kinetics of Desorption of Surfactant at the Solid-Liquid Interface Clark, S. P.; Ducker, W. A. J. Phys. Chem. B. 2003 107 9011-9021.
46. Forces between Colloid Particles in Natural Waters, Mosely, L. M., Hunter, K. H., Ducker, W. A. Journal of Environmental Science and Technology 2003, 37, 3303-3308.
45. A strategy for the Sequential Patterning of Proteins; Catalytically Active Multi-protein Nanofabrication Jang, C.-H.*; Calter, M. A. †; Ducker, W. A. † Nanoletters 2003, 3, 691-693.
44. Surface Imaging Of A Natural Mineral Surface Using Scanning-Probe Microscopy, Bokern D. G. *; Ducker, W. A.; Hunter, K. A. ‡; McGrath, K. M. ‡† Journal of Crystal Growth 2002, 246, 139-149.
43. Immobilized Enzymes as Catalytically-Active Tools for Nanofabrication, Jang, C.-J*; Stevens, B. D.†; Carlier, P. R.‡; Calter, M. A. ‡; Ducker, W. A.† Journal of the American Chemical Society 2002, 124, 12114-12115.
42. Celery (Apium Graveolens) Parenchyma Cell Walls: Cell Walls with Minimal Xyloglucan, Thimm, J. C. *; Burritt, D. J. ‡; Sims, I. M.; Newman, R. H.; Ducker, W. A.; Melton, L. D. ‡† Physiologia Plantarum 2002, 116, 164–171.
41. Proximal adsorption of dodecyltrimethylammonium bromide to the silica-electrolyte solution interface Lokar, W. J.*; Ducker, W. A. † Langmuir 2002, 18 3167-3175.
40. AFM Study of Adsorption of Cationic Surfactants and Cationic Polyelectrolytes at the Silica–Water Interface, Liu§, J.-F. ,Min*, G.; Ducker†, W. A. Langmuir 2001, 17 4895-4903.
39. Decay Lengths of Double-layer Forces in Solutions of Partly Associated Ions, Tulpar*, A.; Subramanian§, V.; Ducker†, W. Langmuir 2001, 17 8451-8454.
38. Proximal Adsorption of Cationic Surfactant on Silica at Equilibrium, Subramanian§, V; Ducker†, W. A Journal of Physical Chemistry B 2001, B 105, 1389–1402.
37. Some Fundamental Differences in the Adhesion and Friction of Rough versus Smooth Surfaces Israelachvili†, J.; Giasson‡, S.; Kuhl, T.; Drummond, C.; Berman, A.;Luengo, J.;Pan, M.; Heuberger, M.; Ducker, W.; Alcantar, N. Tribological Series 2000, 38, 3-12.
36. Celery (Apium Graveolins L.) Parenchyma Cell Walls Examined by Atomic Force Microscopy: Effect of Dehydration on Cellulose Microfibrils, Thimm*, J. C.; Burritt‡†, D. J.; Ducker, W. A.; Melton‡, L. D. Planta 2000, 212, 25–32.
35. Aggregation of hydroxy Quaternary Ammonium Bolaform Surfactants, Davey*, T. W.; Ducker†, W. A.; Hayman‡ A. R. Langmuir 2000, 16, 2430–2435.
34. Counterion Effects on Adsorbed Micellar Shape: Experimental Study of the Role of Polarizability and Charge, Subramanian§, V.; Ducker†, W. A. Langmuir 2000, 16, 4447–4454.
33. Self-Assembled Supramolecular Structures of Charged Polymers at the Graphite/Liquid Interface, Liu§, J.-F., Ducker†, W. A. Langmuir 2000, 16, 3467–3473.
32. Surface-Induced Phase Behavior of Alkyltrimethylammonium Bromide Surfactants Adsorbed to Mica, Silica, and Graphite, Liu§, J.-F.; Ducker†, W. A. Journal of Physical Chemistry B 1999, 103, 8558–8567.
31. Adsorption of Hexadecyltrimethylammonium Bromide to Mica: Nanometer-Scale Study of Binding-Site Competition, Ducker†; W. A.; Wanless§, E. J. Langmuir 1999, 15, 160–168.
30. Surface-Induced Transformations for Surfactant Aggregates, Lamont*, R. E.; Ducker†, W. A., Journal of the American Chemical Society 1998, 120, 7062–7067.
29. Krafft Temperature Depression in Quaternary Ammonium Bromide Surfactants, Davey*, T. W.; Ducker, W. A.; Hayman†‡, A. R.; Simpson‡, J., Langmuir 1998, 14, 3210–3213.
28. Nanometer-Scale Organization of Ethylene Oxide Surfactants on Graphite, Hydrophobic Silica, and Hydrophobic Silica, Grant*, L. M.; Tiberg‡, F.; Ducker†, W. A. Journal of Physical Chemistry B 1998, 102, 4288–4294.
27. Surface-Aggregate Phase Transition, Wanless§, E. J.; Davey*, T. W.; Ducker†, W. A., Langmuir 1997, 16, 4223–4228.
26. Effect of Substrate Hydrophobicity on Surface-Aggregate Geometry: Zwitterionic and Non-ionic Surfactants, Grant*, L. M.; Ducker†, W. A., Journal of Physical Chemistry B 1997, 101, 5337–5345.
25. Organized Structure of Lithium Perfluorooctanesulfonate at the Graphite-Solution Interface, Lamont*, R. E.; Ducker†, W. A., Journal of Colloid Interface Science 1997, 191, 303–311.
24. Weak Influence of Divalent Ions on Anionic Surfactant Surface Aggregation, Wanless§, E. J.; Ducker†, W. A., Langmuir 1997, 13, 1463–1474.
23. Effect of Zwitterionic Surfactants on Interparticle Forces, Rheology and Particle Packing of Silicon Nitride Slurries, Ducker, W. A.; Luther, E. P.; Clarke, D. R. †; Lange, F. F., Journal of the American Ceramics Society 1997, 80, 575–583.
22. Surface-Aggregate Shape Transformation, Wanless§, E. J.; Ducker†, W. A., Langmuir 1996, 12, 5915–5920.
21. Effect of Substrate Hydrophobicity on Surfactant Surface-Aggregate Geometry, Ducker†, W. A.; Grant*, L. M., Journal of Physical Chemistry B 1996, 100, 11507–11510.
20. The Organization of Sodium Dodecylsulfate at the Graphite-Solution Interface, Wanless§, E. J.; Ducker, W. A. †, Journal of Physical Chemistry B 1996, 100, 3207–3214.
19. Adsorption of Dipolar (Zwitterionic) Surfactants to Dipolar Surfaces, Chavez, P.; Ducker, W. A.; Israelachvili†, J. N.; Maxwell, K., Langmuir 1996, 12, 4111–4115.
18. Forces between Crystalline Alumina (Sapphire) Surfaces in Aqueous Dodecylsulfate Surfactant Solutions, Xu, Z.; Ducker, W. A.; Israelachvili† J. N., Langmuir 1996, 12, 2263–2270.
17. Measuring Surface Forces in Aqueous Electrolyte Solution with the Atomic Force Microscope, Butt†‡, H.-J.; Jaschke, M.; Ducker, W. A.; Bioelectroncs and Bioenergetics 1995, 38, 191–201.
16. Origin and Characterization of Different Stick-Slip Mechanisms, Berman, A. D.; Ducker, W. A.; Israelachvili†, J. N., Langmuir 1996, 12, 4559–4563.
15. Measurement of Hydrophobic and DLVO Forces in Bubble-Surface Interactions in Aqueous Solutions, Ducker†, W. A.; Xu, Z.; Israelachvili, J. N., Langmuir 1994, 10, 3270–3289.
14. The Forces between Alumina Surfaces in Salt Solutions: Non-DLVO Forces and their Effect on Colloidal Processing. Ducker†, W. A.; Xu, Z.; Israelachvili, J. N., Clarke, D. R., Journal of the American Ceramics Society 1994, 77, 437–443.
13. Experimental Determination of Spring Constants in Atomic Force Microscopy, Senden, T. J.; Ducker†, W. A., Langmuir 1994, 10, 1003–1005.
12. Controlled Modification of Silicon Nitride Interactions in Water via Zwitterion Surfactant Adsorption, Ducker†, W. A.; Clarke, D. R., Colloids and Surfaces A 1994, 94, 275–292.
11. Lateral, Normal and Longitudinal Spring Constants of Atomic Force Microscopy Cantilevers, Neumeister†, J. N.; Ducker, W. A., Review of Scientific Instruments 1994, 65, 2527–2531.
10. Van der Waals Epitaxial Growth of -Alumina Nanocrystals on Mica, Steinberg, S.; Ducker, W. A.; Vigil, G.; Hyukjin, C.; Frank, C.; Tseng, W.; Clarke, D. R.; Israelachvili†, J. N., Science 1993, 260, 656–659.
9. Measurement of Forces in Liquids Using a Force Microscope, Ducker†, W. A.; Senden, T. J.; Pashley, R. M., Langmur 1992, 8, 1831–1836.
8. Forces between Mica Surfaces in the Presence of Rod-Shaped Divalent Counter-ions, Ducker†, W. A.; Pashley, R. M., Langmuir 1992, 8, 109–112.
7. The Surface Roughness of Plasma Treated Mica, Senden, T. J.; Ducker†, W. A., Langmuir 1992,8, 733–734.
6. Direct Measurement of the Forces on a Colloid Particle using an Atomic Force Microscope, Ducker†, W. A.; Senden, T. J.; Pashley, R. M., Nature 1991, 353, 239–241.
5. Rapid Measurement of Static and Dynamic Surface Forces, Ducker†, W. A.; Cook, R. F., Applied Physics Letters 1990, 56, 2408–2410.
4. Force Measurement using an AC Atomic Force Microscope, Ducker†, W. A.; Cook, R. F.; Clarke, D. R., Journal of Applied Physics 1990, 67, 4045–4052.
3. Multilayer Adsorption of Cytochrome C on Mica around the Isoelectric pH, Kekicheff†, K., Ducker, W. A.; Ninham, B. W.; Pelini, M.-P., Langmuir 1990, 6, 1704–1708.
2. The Forces between Mica Surfaces in Ammonium Chloride Solutions, Ducker, W. A. †; Pashley, R. M., Journal of Colloid and Interface Science 1989, 131, 433– 436.
1. The Flotation of Quartz using a Double-Chained Cationic Surfactant, Ducker, W. A.; Pashley†, R. M.; Ninham, B. W., Journal of Colloid and Interface Science. 1989, 128, 66–75.