Structural and microscopic relaxations in a colloidal glass.
作者： Flavio Augusto de Melo Marques , Roberta Angelini , Emanuela Zaccarelli , Bela Farago , Beatrice Ruta
DOI: 10.1039/C4SM02010C
关键词: Neutron spin echo 、 Wave vector 、 Range (particle radiation) 、 Relaxation (NMR) 、 Glass transition 、 Materials science 、 Scaling 、 Condensed matter physics 、 Dynamic light scattering 、 Molecular dynamics
摘要: The aging dynamics of a colloidal glass has been studied by multiangle dynamic light scattering, neutron spin echo, X-ray photon correlation spectroscopy and molecular simulations. two relaxation processes, microscopic (fast) structural (slow), have investigated in an unprecedentedly wide range time length scales covering both ergodic nonergodic regimes. remains diffusive at all across the transition scaling with wavevector Q as Q−2. length-scale dependence changes from diffusive, characterized Q−2-dependence early stages aging, to Q−1-dependence full regime which marks discontinuous hopping dynamics. Both regimes are associated stretched behaviour functions. We expect these findings provide general description relaxations transition.
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