scholarly journals Local elastic expansion model for viscous-flow activation energies of glass-forming molecular liquids

1996 ◽  
Vol 53 (5) ◽  
pp. 2171-2174 ◽  
Author(s):  
Jeppe C. Dyre ◽  
Niels Boye Olsen ◽  
Tage Christensen
Keyword(s):  
Viscous Flow ◽  
Activation Energies ◽  
Molecular Liquids ◽  
Glass Forming ◽  
Flow Activation ◽  
Expansion Model

Effects of viscous flow activation energies and viscosities on waterborne light-diffusion dip-coatings

2019 ◽  
Vol 48 (5) ◽  
pp. 415-420
Author(s):  
Tian Fang ◽  
Daiyong Ye
Keyword(s):  
Shear Rate ◽  
Viscous Flow ◽  
Activation Energies ◽  
Rotational Viscometer ◽  
Acrylic Emulsion ◽  
Environment Friendly ◽  
Content Type ◽  
Shear Rates ◽  
Flow Activation ◽  
Light Diffusion

Purpose This paper aims to prepare good waterborne light-diffusion dip-coatings (WLDDC) for the glass lampshade inner walls of LED lamp tubes, the effects of viscosities and viscous flow activation energies on these dip-coatings were investigated. Design/methodology/approach The WLDDC were prepared using white pigments, light-diffusion agents, additives and an acrylic emulsion. The dip-coatings were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and a digital rotational viscometer, respectively. The effects of shear rates, temperatures and solids contents on the viscosities of the dip-coatings were studied. The viscous flow activation energies of these dip-coatings and the emulsion were calculated, compared and studied, respectively. Findings The results showed that the non-Newtonian behaviors of these dip-coatings were more prominent than that of the acrylic emulsion. When the temperature was maintained to be a constant and the shear rate was increased, the viscosity decreased and the shear stress increased. When the shear rate was maintained to be a constant, the viscosity decreased with increasing temperatures. The viscous flow activation energies of these dip-coatings decreased with the increasing shear rates. The higher solid contents of WLDDC were, the more its viscosity would decrease with the increasing shear rates, the more prominent its non-Newtonian behaviors would show. Practical implications A sample of good WLDDC with balanced properties was illustrated. Originality/value This investigation benefits to investigate waterborne environment-friendly dip-coatings for the inner glass walls of lamp tubes. This research provides an approach to optimize the viscosity parameters of light-diffusion dip-coatings.

Crystal nucleation rates in glass-forming molecular liquids: D-sorbitol, D-arabitol, D-xylitol, and glycerol

2018 ◽  
Vol 149 (5) ◽  
pp. 054503 ◽  
Author(s):  
Chengbin Huang ◽  
Zhenxuan Chen ◽  
Yue Gui ◽  
Chenyang Shi ◽  
Geoff G. Z. Zhang ◽  
...  
Keyword(s):  
Crystal Nucleation ◽  
Molecular Liquids ◽  
Glass Forming

Experimental Study of the Liquid-Glass Transition in an Inorganic Polymer Li0.5Na0.5PO3

1995 ◽  
Vol 407 ◽  
Author(s):  
B. Rufflé ◽  
S. Beaufils ◽  
Y. Délugeard ◽  
G. Coddens ◽  
J. Etrillard ◽  
...  
Keyword(s):  
Experimental Study ◽  
Glass Transition ◽  
Raman Scattering ◽  
Viscous Flow ◽  
Liquid Glass ◽  
Low Frequency ◽  
Glass Forming ◽  
Scattering Spectra ◽  
Temperature Ranges ◽  
Raman Scattering Spectra

ABSTRACTNew experimental results obtained with various techniques on a less-studied glass-forming system are presented. At low frequency, a secondary βslow-process, decoupled from the viscous flow, is observed by 3 1P NMR. Raman scattering spectra and coherent neutron scattering spectra has been obtained in wide frequency and temperature ranges showing the same qualitative features for the Boson peak while the quasielastic contribution seems to differ markedly.

Secondary relaxation dynamics in rigid glass-forming molecular liquids with related structures

2015 ◽  
Vol 143 (10) ◽  
pp. 104505 ◽  
Author(s):  
Xiangqian Li ◽  
Meng Wang ◽  
Riping Liu ◽  
Kia L. Ngai ◽  
Yongjun Tian ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Molecular Liquids ◽  
Secondary Relaxation ◽  
Glass Forming

Surface diffusion and flow activation energies of perfluoropolyalkylether

1995 ◽  
Vol 1 (2-3) ◽  
Author(s):  
TeresaM. O'Connor ◽  
MyungS. Jhon ◽  
CharlesL. Bauer ◽  
ByungG. Min ◽  
DoY. Yoon ◽  
...  
Keyword(s):  
Surface Diffusion ◽  
Activation Energies ◽  
Flow Activation
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