title: Effect of bulk aging on surface diffusion of glasses.
abstract: The effect of physical aging on surface diffusion has been determined for two organic glasses, Indomethacin and Nifedipine. The two systems exhibit similar aging kinetics typical of organic glasses. Surface diffusivity remains unchanged despite significant bulk aging that nearly equilibrates the systems and increases the bulk relaxation time by orders of magnitude. The finding is relevant for understanding the stability of amorphous materials and the formation of low-energy glasses by vapor deposition.
authors: Department of Chemistry and School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
authors: Caleb W
authors: CW
authors: Brian
authors: Department of Chemistry and School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
authors: Lei
authors: L
authors: Zhu
authors: Department of Chemistry and School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
authors: Lian
authors: L
authors: Yu