日本京都大学化工系�谷 公教授学术报告通知

Abstract:The stability of colloidal particles in solutions depends on the interaction forces between

 their surfaces. It is well known that the long-range force between particles is expressed by the 

classical DLVO theory, in which the electrostatic repulsive and van der Waals attractive forces

 are taken into account, but it is also known that the short-range interaction forces cannot be 

explained by the DLVO theory. This short-range non-DLVO force is often called "solvation force" 

or "structured force" [1]. On this short-range force, a large number of investigations have been

 conducted, using the atomic force microscope (AFM) and the surface force apparatus (SFA), 

and it was clarified that a few adsorbed layers of water molecules, cations and solvated cations

 do exist on the particle surface and influence greatly the macroscopic behavior of particles, such 

as their stability, adhesive forces and friction forces. In this talk, it will be shown how directly the

 molecular-scale structures at the interface between the particle and medium affect the behavior 

of colloidal dispersions macroscopically, by introducing our experimental results measured with 

the atomic force microscopes (AFM), as well as the results estimated by computer simulations [2].

[1] J. N. Israelachvili, in: Intermolecular & Surfaces Forces, 2nd ed. Academic Press, NY, (1992).

[2] H. Shinto H, et al., Langmuir 16: 3361-3371 (2000)