Studies on the Temperature Dependent Fluorescence of Poly-N-Vinylcarbazole Films up to the Glass Transition: Role of the Excimer Forming Sites

1988 ◽  
Vol 156 (1) ◽  
pp. 319-329 ◽  
Author(s):  
Gabriele Giro ◽  
Piergiulio Di Marco ◽  
Francesco Barigelletti
Keyword(s):  
Glass Transition ◽  
Temperature Dependent

The role of long relaxation times in a simple model with massless modes

2018 ◽  
Vol 96 (8) ◽  
pp. 912-918 ◽  
Author(s):  
R. Timmons ◽  
K. De’Bell
Keyword(s):  
Monte Carlo ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Relaxation Times ◽  
Critical Ratio ◽  
Nearest Neighbour ◽  
Temperature Dependent ◽  
Dependent Behaviour

The next-nearest-neighbour Ising model with competing nearest-neighbour (nn) and next-nearest-neighbour (nnn) interactions, provides an example of a system in which massless modes destroy order at any finite temperature. This occurs only at a critical ratio, Kc, of the nnn and nn interactions. In this paper we investigate the role of long relaxation times in determining the behaviour of the system when the ratio of the nnn and nn interactions, K, is at and close to this critical ratio. Despite the absence of an order–disorder transition in systems with K = Kc, in Monte Carlo simulations reported here the temperature-dependent behaviour of the relaxation times indicates the existence of a glass transition with a glass transition temperature of Tg ≈ 0.26 in a model with nn interaction J = kB = 1.

Investigating the role of GeO2 in enhancing the thermal stability and proton mobility of proton-conducting phosphate glasses

2021 ◽  
Author(s):  
Takahisa Omata ◽  
Aman Sharma ◽  
Takuya Kinoshita ◽  
Issei Suzuki ◽  
Tomohiro Ishiyama ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Phosphate Glasses ◽  
Proton Mobility ◽  
Proton Conducting

In this study, the effect of GeO2 on the thermal stability and proton mobility (μH) of proton-conducting phosphate glasses was experimentally investigated using 22HO1/2−3NaO1/2−(12−x)LaO3/2−xGeO2−63PO5/2 glasses. Increasing glass transition temperature (Tg)...

Ambient temperature-dependent thermoregulatory role of REM sleep

2012 ◽  
Vol 37 (5) ◽  
pp. 392-396
Author(s):  
Deependra Kumar ◽  
Velayudhan Mohan Kumar ◽  
Hruda Nanda Mallick
Keyword(s):  
Ambient Temperature ◽  
Rem Sleep ◽  
Temperature Dependent

scholarly journals Role of entropy in the thermodynamic evolution of the time scale of molecular dynamics near the glass transition

2015 ◽  
Vol 91 (6) ◽  
Author(s):  
K. Grzybowska ◽  
A. Grzybowski ◽  
S. Pawlus ◽  
J. Pionteck ◽  
M. Paluch
Keyword(s):  
Molecular Dynamics ◽  
Glass Transition ◽  
Time Scale

Observation of the Pinning-Induced Crystal-Hexatic-Glass Transition in Two-Dimensional Colloidal Suspensions

2021 ◽  
Vol 38 (10) ◽  
pp. 106101
Author(s):  
Xiaoyan Sun ◽  
Huaguang Wang ◽  
Hao Feng ◽  
Zexin Zhang ◽  
Yuqiang Ma
Keyword(s):  
Glass Transition ◽  
Colloidal Suspensions ◽  
Two Dimensional ◽  
Colloidal Systems ◽  
Fundamental Understanding ◽  
New Strategy ◽  
Glassy Materials ◽  
Colloidal Glass ◽  
Orientational Correlation

Identification of the glass formation process in various conditions is of importance for fundamental understanding of the mechanism of glass transitions as well as for developments and applications of glassy materials. We investigate the role of pinning in driving the transformation of crystal into glass in two-dimensional colloidal suspensions of monodisperse microspheres. The pinning is produced by immobilizing a fraction of microspheres on the substrate of sample cells where the mobile microspheres sediment. Structurally, the crystal-hexatic-glass transition occurs with increasing the number fraction of pinning ρ pinning, and the orientational correlation exhibits a change from quasi-long-range to short-range order at ρ pinning = 0.02. Interestingly, the dynamics shows a non-monotonic change with increasing the fraction of pinning. This is due to the competition between the disorder that enhances the dynamics and the pinning that hinders the particle motions. Our work highlights the important role of the pinning on the colloidal glass transition, which not only provides a new strategy to prevent crystallization forming glass, but also is helpful for understanding of the vitrification in colloidal systems.

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