Details

Autor(en) / Beteiligte

• Swallen, Stephen F
• Mapes, Marie K
• Kim, Yong Seol
• McMahon, Robert J
• Ediger, M D
• Satija, Sushil

Titel

Neutron reflectivity measurements of the translational motionof tris(naphthylbenzene) at the glass transition temperature

Ist Teil von

• The Journal of chemical physics, 2006-05, Vol.124 (18), p.184501-184501-9

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2006

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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 T g . Neutron reflectivity was used to measure isotopic interdiffusion of multilayer samples created by physical vapor deposition. Deposition with the substrate held at T g − 6 K allows observation of dynamics characterizing the equilibrium supercooled liquid. The diffusion coefficient measured at q = 0.03 Å − 1 was determined to be 1 × 10 − 17 cm 2 ∕ s at 342 K ( T g ) . The self-part of the intermediate scattering function I s ( q , t ) decays exponentially. Samples deposited well below T g show a substantial thermal history effect during subsequent translational motion at T g .