New Method for Extracting Diffusion-Controlled Kinetics from Differential Scanning Calorimetry: Application to Energetic Nanostructures

2015 ◽  
pp. 150610143303004 ◽  
Author(s):  
Shijing Lu ◽  
Edward J. Mily ◽  
Douglas L. Irving ◽  
Jon-Paul Maria ◽  
Donald W. Brenner
Keyword(s):  
Differential Scanning Calorimetry ◽  
New Method ◽  
Scanning Calorimetry ◽  
Diffusion Controlled

Diffusion-Controlled Nanocrystallization of the Fe73.5Cu1Nb3Si15.5B7 Finemet Amorphous Alloy

2008 ◽  
Vol 570 ◽  
pp. 120-125
Author(s):  
R.M. Ribeiro ◽  
R.S. de Biasi ◽  
D.R. dos Santos ◽  
Dílson S. dos Santos
Keyword(s):  
Differential Scanning Calorimetry ◽  
Amorphous Alloy ◽  
Small Angle ◽  
Nucleation And Growth ◽  
Amorphous Metallic Alloy ◽  
Scanning Calorimetry ◽  
X Ray ◽  
X Ray Scattering ◽  
Diffusion Controlled

Crystallization of the amorphous metallic alloy Fe73.5 Cu1Nb3 Si8.5 B14 was investigated by ferromagnetic resonance (FMR), small angle in situ X-ray scattering (SAXS/WAXS) and differential scanning calorimetry (DSC). Only one crystalline phase was observed by WAXS and only one peak was observed by DSC. The activation energies, calculated from FMR and DSC data, were 287 kJ.mol-1 and 313.4 kJ.mol-1, respectively. The values calculated for the Avrami exponent were 0.98 (FMR) and 1.4 (DSC). These values correspond to different mechanisms of nucleation and growth; however, the SAXS /WAXS results suggest that the dominant mechanisms are nucleation and growth of crystals from small dimensions.

Phase-transformation kinetics in triphasic cordierite gel

2001 ◽  
Vol 16 (2) ◽  
pp. 451-458 ◽  
Author(s):  
R. Petrović ◽  
Dj. Janacković ◽  
S. Zec ◽  
S. Drmanić ◽  
Lj. Kostić-Gvozdenović
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Silica Sol ◽  
Infrared Spectrometry ◽  
Scanning Calorimetry ◽  
Exchange Method ◽  
Modulated Structure ◽  
Diffusion Controlled ◽  
Modulated Phase ◽  
Surface Transformation

A triphasic cordierite-type gel was prepared from silica sol, boehmite sol, and an aqueous solution of Mg(NO3)2 · 6H2O. The silica sol was obtained from water glass by the ion exchange method, while boehmite sol was obtained by peptization of freshly prepared Al(OH)3. Phase transformations occurring in the gel were studied by differential scanning calorimetry, x-ray diffractometry, and Fourier transform infrared spectrometry. Spinel was observed to crystallize from the gel prior to cristobalite; their reaction subsequently yielded α-cordierite. At higher temperatures, α-cordierite transformed into modulated β-cordierite. Kinetic parameters of α-cordierite formation and α-cordierite to modulated β-cordierite transformation were determined by differential scanning calorimetry under nonisothermal conditions. Formation of a-cordierite was found to be a diffusion-controlled process, with an overall activation energy of Ea = 1242 ± 66 kJ/mol. During the α → β-cordierite transformation, a modulated phase was formed by surface transformation of α-cordierite. The overall activation energy for the formation of the modulated structure is Ea = 583±77 kJ/mol.

A New Method for Estimating Strength Distribution of Noncovalent Bondings in Coal by Differential Scanning Calorimetry

1994 ◽  
Vol 8 (4) ◽  
pp. 874-880 ◽  
Author(s):  
Kouichi Miura ◽  
Kazuhiro Mae ◽  
Shoji Takebe ◽  
Hideyuki Wakiyasu ◽  
Kenji Hashimoto
Keyword(s):  
Differential Scanning Calorimetry ◽  
Strength Distribution ◽  
New Method ◽  
Scanning Calorimetry

Improving the dispersity of detonation nanodiamond: differential scanning calorimetry as a new method of controlling the aggregation state of nanodiamond powders

Nanoscale ◽  
2013 ◽  
Vol 5 (4) ◽  
pp. 1529 ◽  
Author(s):  
Mikhail V. Korobov ◽  
Dmitry S. Volkov ◽  
Natalya V. Avramenko ◽  
Lubov' A. Belyaeva ◽  
Pavel I. Semenyuk ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
New Method ◽  
Detonation Nanodiamond ◽  
Scanning Calorimetry ◽  
Aggregation State

A new method for the measurement of enthalpies of sublimation using differential scanning calorimetry

1988 ◽  
Vol 124 ◽  
pp. 229-233 ◽  
Author(s):  
Luis Alfonso Torres-Gómez ◽  
Guadalupe Barreiro-Rodríguez ◽  
Armando Galarza-Mondragón
Keyword(s):  
Differential Scanning Calorimetry ◽  
New Method ◽  
Scanning Calorimetry ◽  
Enthalpies Of Sublimation

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

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