36. Butt, H.J., Electrostatic Interaction in Atomic Force Microscopy. Biophysical
Journal, 1991. 60(4): p. 777-785.
37. Ducker, W. A., T. J. Senden, and R.M. Pashley, Direct Measurement of Colloidal
Forces Using an Atomic Force Microscope. Nature, 1991. 353(6341): p. 239-241.
38. Ducker, W.A., T. J. Senden, and R.M. Pashley, Measurement of Forces in Liquids
Using a Force Microscope. Langmuir, 1992. 8(7): p. 1831-1836.
39. Li, Y.Q., et al., Direct Measurement of Interaction Forces between Colloidal
Particles Using the Scanning Force Microscope. Langmuir, 1993. 9(3): p. 637-
641.
40. Drummond, C. J. and T.J. Senden, Examination of the Geometry of Long-Range
Tip Sample Interaction in Atomic-Force Microscopy. Colloids and Surfaces a-
Physicochemical and Engineering Aspects, 1994. 87(3): p. 217-234.
41. Manne, S., et al., Direct Visualization of Surfactant Hemimicelles by Force
Microscopy of the Electrical Double-Layer. Langmuir, 1994. 10(12): p. 4409-
4413.
42. Rotsch, C. and M. Radmacher, Mapping local electrostatic forces with the atomic
force microscope. Langmuir, 1997. 13(10): p. 2825-2832.
43. Heinz, W.F. and J.H. Hoh, Relative surface charge density mapping with the
atomic force microscope. Biophysical Journal, 1999. 76(1): p. 528-538.
44. Czajkowsky, D.M., et al., Direct visualization of surface charge in aqueous
solution. Ultramicroscopy, 1998. 74(1-2): p. 1-5.
45. Johnson, A.S., et al., Fluid electric force microscopy for charge density mapping
in biological systems. Langmuir, 2003. 19(24): p. 10007-10010.
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