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  • Title: Neutron reflectivity measurements of the translational motion of tris(naphthylbenzene) at the glass transition temperature.
    Author: Swallen SF, Mapes MK, Kim YS, McMahon RJ, Ediger MD, Satija S.
    Journal: J Chem Phys; 2006 May 14; 124(18):184501. PubMed ID: 16709120.
    Abstract:
    The translational dynamics of the low molecular weight glass-former tris(naphthylbenzene) have been studied on the length scale of a few nanometers at the glass transition temperature Tg. Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor deposition. Deposition with the substrate held at Tg-6 K allows observation of dynamics characterizing the equilibrium supercooled liquid. The diffusion coefficient measured at q = 0.03 A(-1) was determined to be 1x10(-17) cm2/s at 342 K (Tg). The self-part of the intermediate scattering function I(s)(q,t) decays exponentially. Samples deposited well below Tg show a substantial thermal history effect during subsequent translational motion at Tg.
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