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Colloquium: November 18, 2015

Jens Biegert*
Mid-IR-driven Electron Recollision: Molecular Diffraction Imaging and Attosecond soft-X-rays
Day Time Place
November 18, 2015 Wednesday 15:40 EE 01

Host: Giovanni Volpe

ABSTRACT — When one slides two surfaces in contact against each other, work has to be done against the force of friction. As an engineering challenge, the reduction of the dissipated energy has been studied for centuries. But what are the microscopic processes underlying the dissipation of kinetic energy into heat? The experimental methods of nanoscience, in particular atomic force microscopy, allow us to study processes of friction on the molecular scale. We will discuss results for three different exciting new materials. Graphene, a strong single layer of carbon, has been found to reduce friction and protect metals surfaces. Ionic liquids are considered as promising lubricants, where the lubrication can be changed by an electrochemical potential. Finally, we have developed a supramolecular surface functionalization for the control of adhesion and friction, where friction can be switched between high and low by external light stimuli.

*ICFO – The Institute of Photonic Sciences, Barcelona, Spain

The Physics Colloquia are designed to address a non-specialist, broad audience and introduce topics of contemporary research through lectures by leading experts. We warmly invite all members of the student body, including undergraduates enrolled in any programme.

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