Decoupling between the interfacial and core molecular dynamics of salol in 2D confinement
PBN-AR
Instytucja
Wydział Matematyki, Fizyki i Chemii (Uniwersytet Śląski w Katowicach)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Journal of Physical Chemistry C
ISSN
1932-7447
EISSN
1932-7455
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2015
Numer zeszytu
25
Strony od-do
4366–14374
Numer tomu
119
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Autorzy
Pozostali autorzy
+ 4
Autorzy przekładu
(liczba autorów przekładu: 0)
Streszczenia
Język
angielski
Treść
Dielectric spectroscopy and differential scanning calorimetry (DSC) were applied to study the molecular dynamics and thermal properties of a low-molecular-weight glass-forming liquid, salol (phenyl salicylate), confined in anodic aluminum oxide membranes of different pore diameters (100–13 nm). On increasing the geometrical confinement, the glass transition temperature shifts toward lower temperatures, while at the same time broadening of the shape of the structural relaxation is observed. This was attributed to the interplay between surface and confinement effects leading to the transition from Vogel–Fulcher–Tammann-like to Arrhenius-like dependence of the structural relaxation times. We have noticed that the temperature of such crossover agrees with the endothermic process detected by DSC. Combined dielectric and calorimetric data have indicated that this phenomenon is related to the decoupling of the dynamics of molecules attached to the pore walls and those at the center. The enhancement of the structural relaxation of the core molecules increases with decreasing pore size possibly due to changes in the packing density. This finding gives a new insight into the behavior of glass-forming liquids under confinement and helps in the understand of the characteristic shift of the dynamic glass transition temperature with decreasing of the pore diameter.
Inne
System-identifier
0192600118045
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