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Dr.  Silvina Gatica

Howard University

Wednesday April 21, 3:30 PM

Thirkield Hall (Physics), room 103 

Trapped Matter

Atoms and molecules are trapped in nano-porous materials or on nano-structured surfaces by weak physical adsorption, i.e. without bonds being formed. These atoms form phases of matter that are unique and sometimes commensurate with the host substrate.

In this talk I will discuss the thermal and structural properties of trapped matter. For example, atoms inside bundles of nanotubes condense at a lower temperature than in bulk; xenon on top of a 2D C60 array condenses at a very low temperature to commensurate 2D lattice; helium-3 can form a 1D or 2D bound state with help from the substrate while such a fluid does not condense if the substrate is rigid.  The effective-dimensionality of these systems is non trivial. For example, atoms adsorbed on a 1D-channel behave as  1D, 2D…11/2D, depending on the temperature.

Refreshments will be served at 3:15 PM.