TY  - JOUR
AU  - Gupta, S.
AU  - Fischer, J. K. H.
AU  - Lunkenheimer, P.
AU  - Loidl, A.
AU  - Novak, E.
AU  - Jalarvo, N.
AU  - Ohl, M.
TI  - Effect of adding nanometre-sized heterogeneities on the structural dynamics and the excess wing of a molecular glass former
JO  - Scientific reports
VL  - 6
SN  - 2045-2322
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2016-07446
SP  - 35034 -
PY  - 2016
AB  - We present the relaxation dynamics of glass-forming glycerol mixed with 1.1 nm sized polyhedral oligomeric silsesquioxane (POSS) molecules using dielectric spectroscopy (DS) and two different neutron scattering (NS) techniques. Both, the reorientational dynamics as measured by DS and the density fluctuations detected by NS reveal a broadening of the α relaxation when POSS molecules are added. Moreover, we find a significant slowing down of the α-relaxation time. These effects are in accord with the heterogeneity scenario considered for the dynamics of glasses and supercooled liquids. The addition of POSS also affects the excess wing in glycerol arising from a secondary relaxation process, which seems to exhibit a dramatic increase in relative strength compared to the α relaxation.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000385063300001
C6  - pmid:27725747
DO  - DOI:10.1038/srep35034
UR  - https://juser.fz-juelich.de/record/824950
ER  -