Effects of ball-milling on the glass transition of wheat flour constituents

2008 ◽  
Vol 89 (3) ◽  
pp. 430-435 ◽  
Author(s):  
Pariya Thanatuksorn ◽  
Kiyoshi Kawai ◽  
Kazuhito Kajiwara ◽  
Toru Suzuki
Keyword(s):  
Glass Transition ◽  
Ball Milling ◽  
Wheat Flour

Mechanically induced solid-state reaction for synthesizing glassy Co75Ti25 soft magnet alloy powders with a wide supercooled liquid region

2002 ◽  
Vol 17 (9) ◽  
pp. 2447-2456 ◽  
Author(s):  
M. Sherif El-Eskandarany ◽  
Wei Zhang ◽  
A. Inoue
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Ball Milling ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
Supercooled Liquid ◽  
High Energy ◽  
Supercooled Liquid Region ◽  
Liquid Region

A single phase of glassy Co75Ti25 alloy powders was synthesized by high-energy ball milling the elemental powders at room temperature, using the mechanical alloying method. The final product of the glassy alloy, which is obtained after ball milling for 86 ks, exhibits soft magnetic properties with polarization and coercivity values of 0.67 T and 2.98 kA/m, respectively. This binary glassy alloy, in which its glass transition temperature (Tg) lies at a rather high temperature (833 K), transforms into face-centered-cubic Co3Ti (ordered phase) at 889 K through a single sharp exothermic reaction with an enthalpy change of crystallization (ΔHx) of −2.35 kJ/mol. The supercooled liquid region before crystallization ΔTx of the synthesized glassy powders shows an extraordinary high value (56 K) for a metallic binary system. The reduced glass transition temperature [ratio between Tg and liquidus temperatures, Tl (Tg/Tl)] was 0.56. We also demonstrated postannealing experiments of the mechanically deformed Co/Ti multilayered composite powders. The results show that annealing of the powders at 710 K leads to the formation of a glassy phase (thermally enhanced glass formation reaction). Its heat formation was measured directly and found to be −0.56 kJ/mol. The similarity in the crystallization and magnetization behaviors between the two classes of as-annealed and as-mechanically alloyed glassy powders implies the formation of the same glassy phase.

The implication of the glass transition in the formation of trehalose/mannitol molecular alloys by ball milling

2007 ◽  
Vol 144 (7-8) ◽  
pp. 288-292 ◽  
Author(s):  
V. Caron ◽  
J.F. Willart ◽  
F. Danède ◽  
M. Descamps
Keyword(s):  
Glass Transition ◽  
Ball Milling

scholarly journals Influence of the Polymer Glass Transition Temperature and Molecular Weight on Drug Amorphization Kinetics Using Ball Milling

Pharmaceutics ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 483 ◽  
Author(s):  
Camilla Asgreen ◽  
Matthias Manne Knopp ◽  
Jeppe Skytte ◽  
Korbinian Löbmann
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Ball Milling ◽  
Molecular Mobility ◽  
Polymer Molecular Weight ◽  
Polymer Glass

In this study, the putative correlation between the molecular mobility of a polymer and the ball milling drug amorphization kinetics (i.e., time to reach full drug amorphization, ta) was studied using different grades of dextran (Dex) and polyvinylpyrrolidone (PVP) and the two model drugs indomethacin (IND) and chloramphenicol (CAP). In general, IND had lower ta values than CAP, indicating that IND amorphized faster than CAP in the presence of the polymers. In addition, an increase in polymer molecular weight (Mw) also led to an increase in ta for all systems investigated up to a critical Mw for each polymer, which was in line with an increase of the glass transition temperature (Tg) up to the critical Mw of each polymer. Hence, the increase in ta seemed to correlate well with the Tg/Mw of the polymers, which indicates that the polymers’ molecular mobility had an influence on the drug amorphization kinetics during ball milling.

Glass transition for dipolar hard spheres: a mode-coupling approach

1998 ◽  
Vol 77 (2) ◽  
pp. 305-311 ◽  
Author(s):  
Thomas Scheidsteger, Rolf Schilling
Keyword(s):  
Glass Transition ◽  
Mode Coupling ◽  
Hard Spheres ◽  
Coupling Approach
Sign in / Sign up

Export Citation Format

Share Document