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Study of Force Interactions between Nano/Micro/Particles and Surfaces in Various Media

Professor Sokolov and Ph.D. student Quy Ong are investigating the force dependencies by means of the Atomic Force Microscopy (AFM). The AFM allows measuring intermolecular forces with very high precision in air, liquids, and in a vacuum. They study such forces to improve chemical-mechanical planarization (CMP), to enhance bacterial bioremediation, and to create biosensors. See an example of measuring forces acting between SiN AFM tips and a polyurethane pad used in CMP. (Figure 3). In addition Professor Sokolov and M.S. student Mike McGuire are building an automatic extension to the AFM, to allow for simultaneous measurements of topography and electrical conductance/impedance of samples. The modified AFM will be used to study molecular impedance and conductivity, and electrical characteristics of nanowires.

For more information about Professor Igor Sokolov and his research, please call him at 315-268-2375 or send email to isokolov@clarkson.edu

 

Self-Assembly of Nanoporous Glasses for Optics and Material Science

Professor Sokolov and Ph.D. student Yaroslav Kievsky are studying the self-assembly of nanoporous silica shapes for various applications, including assembly of micro-lasers, advanced optical fibers, and fibers for self-healing materials. For example, the micro-lasers are self-assembled fibers that contain molecules of laser organic dye inside the pores. Organic dye lasers allow one to reach almost any wavelength in the near optical range. At the same time, these lasers have a number of problems. The main problems are the short life time and low dye concentration. In their self-assembled system, each dye molecule is separated from the other one by molecules of surfactant preventing dimerization of the dyes. This allows them to obtain a very high concentration of the dye, which is impossible in just liquid. Furthermore, sealing the dye inside glass prevents the dye from photo-oxidation during the laser process. This will significantly prolong the lifetime of the laser.

Members of Otsuka Chemical Company in Japan and of NanoDynamics in Buffalo, NY visit CAMP.

From Left: CAMP Deputy Director Edward McNamara, CEO of NanoDynamics Keith Blakely, Vice Provost / CAMP Director S.V. Babu, and Director and Executive Officer Dr. Michio Sasaoka of Otsuka Chemical Company.)

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