Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Poster: Glass Transition and Dynamics of Liquids

CPP 22.5: Poster

Tuesday, March 15, 2011, 18:00–20:00, P2

Molecular dynamics of glass forming liquids under geometrical nano-confinement — •Wycliffe Kipnusu¹, Ciprian Iacob¹, Joshua Sangoro¹, Roger Gläser², and Friedrich Kremer¹ — ¹Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany — ²Institute of Chemical Technology, University of Leipzig, Leipzig, Germany

Translational and rotational dynamics in glass forming liquids confined in porous silica membranes having parallel cylindrical pores with diameters ranging between 5-12nm is studied by Broadband Dielectric Spectroscopy (BDS). Molecular dynamics, as reflected on the microscopic scale by the rotational and translation diffusion, exhibit deviations from the bulk behaviour when glass forming liquids are under mesoscopic confinement. The deviation is a result of interplay between surface effects due to interaction of the molecules with the pore walls and confinement effects pressumably caused by a change in packing density of the constrained molecules.

References:

[1]C. Iacob et al., Phys.Chem.Chem.Phys.11, 913-916, (2010).

[2]J. Sangoro et al., Phys.Chem.Chem.Phys. 12, 13798-13803, (2009).