A study of the properties of water-in-oil microemulsions in the subzero temperature range by differential scanning calorimetry

2007 ◽  
pp. 66-75 ◽  
Author(s):  
D. Senatra ◽  
Z. Zhou ◽  
L. Pieraccini
Keyword(s):  
Differential Scanning Calorimetry ◽  
Subzero Temperature ◽  
Scanning Calorimetry ◽  
Temperature Range

Specific heats of polymer powders by differential scanning calorimetry

1982 ◽  
Vol 60 (14) ◽  
pp. 1853-1856 ◽  
Author(s):  
Eva I. Vargha-Butler ◽  
A. Wilhelm Neumann ◽  
Hassan A. Hamza
Keyword(s):  
Differential Scanning Calorimetry ◽  
Specific Heat ◽  
Scanning Calorimetry ◽  
Temperature Range ◽  
Specific Heats ◽  
Powdered Form ◽  
Polymer Powders

The specific heats of five polymers were determined by differential scanning calorimetry (DSC) in the temperature range of 300 to 360 K. The measurements were performed with polymers in the form of films, powders, and granules to clarify whether or not DSC specific heat values are dependent on the diminution of the sample. It was found that the specific heats for the bulk and powdered form of the polymer samples are indistinguishable within the error limits, justifying the determination of specific heats of powders by means of DSC.

Dynamic Globularization of α-Phase in Ti6Al4V Alloy during Hot Compression

2014 ◽  
Vol 783-786 ◽  
pp. 584-590 ◽  
Author(s):  
Kalenda Mutombo ◽  
C. Siyasiya ◽  
W.E. Stumpf
Keyword(s):  
Differential Scanning Calorimetry ◽  
Transition Temperature ◽  
Strain Rate ◽  
Alpha Phase ◽  
Ti6al4v Alloy ◽  
Thermodynamic Calculations ◽  
Scanning Calorimetry ◽  
Temperature Range ◽  
Α Phase ◽  
Dsc Thermograms

Ti6Al4V samples were isothermally compressed using a Gleeble(TM) 1500D thermo-mechanical simulator. Differential scanning calorimetry (DSC), microstructural analyses, and thermodynamic calculations were used to investigate the sequence of transformation of β into α or vice-versa and the presence of different phases in the compressed Ti6Al4V sample. Globular alpha phase was revealed in the isothermally compressed sample in addition to martensitic and lamellar α/β structures. The transition temperature range of β into α-phase was determined using the DSC thermograms and thermodynamic calculated diagrams. The fraction of α-phase globulized increased as the strain rate decreased from 0.01s-1 to 10-3s-1, and the spheroidization of the α-phase is only possible in a specific range of deformation temperatures.

Heat Capacity and Thermodynamic Properties of LaBr3 at 300 – 1100 K

2004 ◽  
Vol 59 (11) ◽  
pp. 825-828
Author(s):  
L. Rycerz ◽  
E. Ingier-Stocka ◽  
B. Ziolek ◽  
S. Gadzuric ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Temperature Range

The heat capacity of solid and liquid LaBr3 was measured by Differential Scanning Calorimetry (DSC) in the temperature range 300 - 1100 K. The obtained results were fitted by a polynomial temperature dependence. The enthalpy of fusion of LaBr3 was also measured. By combination of these results with the literature data on the entropy, S0m (LaBr3, s, 298.15 K) and the standard molar enthalpy of formation, ΔformH0m (LaBr3, s, 298.15 K), the thermodynamic functions of lanthanum tribromide were calculated up to 1300 K

scholarly journals 136 DIFFERENTIAL SCANNING CALORIMETRY (DSC) OF AVOCADO AND MANGO FRUITS STORED IN AN INSECTICIDAL ATMOSPHERE

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 448b-448 ◽  
Author(s):  
Elbadi M. Yahia ◽  
Marisela Rivera Dominguez
Keyword(s):  
Differential Scanning Calorimetry ◽  
Scanning Calorimetry ◽  
Fresh Tissue ◽  
Tissue Samples ◽  
Controlled Atmospheres ◽  
Qualitative And Quantitative ◽  
Temperature Range ◽  
Tolerance To Hypoxia

Modified and controlled atmospheres with ≤ 0.5% O2 and/or ≥ 50% CO2 are insecticidal. In previous studies we have found that avocado is very sensitive and mango is very tolerant to these atmospheres. We used DSC to study the differences in response between these two fruits, and to relate that with their sensitivity/tolerance to hypoxia. Fresh or lyophilized tissues of fruits stored in air or in an insecticidal atmosphere were scanned at a temperature range of 10 to 145°C at a rate of 10°C/min. There were qualitative and quantitative differences between thermograms. There were fewer endotherms in thermograms of fresh tissue samples than in lyophilized tissue samples. Avocado thermograms showed a major endotherm at ca 15°C and 2 minor endotherms at ca 105-110°C. In addition, mango heating thermograms showed another major endotherm at ca 80°C. This endotherm was not present in the heating thermograms of avocado. and might represent a contributing factor in the tolerance of mango to insecticidal atmospheres.

scholarly journals Synthesis of Cyanate Esters Based on Mono-O-Methylated Bisphenols with Sulfur-Containing Bridges

Molecules ◽  
2019 ◽  
Vol 24 (1) ◽  
pp. 177
Author(s):  
Andrey Galukhin ◽  
Roman Nosov
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Maldi Mass Spectrometry ◽  
Phenolic Hydroxyl ◽  
Synthetic Approach ◽  
Reaction Enthalpy ◽  
Scanning Calorimetry ◽  
Cyanate Esters ◽  
Temperature Range ◽  
Sulfur Containing

We described a synthetic approach to bisphenol-based monocyanate esters based on mono-O-methylation of parental bisphenols followed by cyanation of the residual phenolic hydroxyl. Structures of the synthesized compounds were determined by the application of IR, NMR 1H and 13C spectroscopies, EI and MALDI mass spectrometry, and purity of the final product was controlled by HPLC. We showed that stability of the cyanate esters depends on the nature of the bridging group. Temperature range of thermally initiated cyclotrimerization of synthesized monocyanate ester, as well as reaction enthalpy, was determined by differential scanning calorimetry (DSC).

scholarly journals Phase Polymorphism of [Mn(DMSO)6](BF4)2 Studied by Differential Scanning Calorimetry

2008 ◽  
Vol 63 (12) ◽  
pp. 808-812 ◽  
Author(s):  
Anna Migdał-Mikuli ◽  
Łukasz Skoczylas
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transitions ◽  
Dmso Molecule ◽  
Formula Unit ◽  
Scanning Calorimetry ◽  
First Order ◽  
Temperature Range ◽  
Phase Polymorphism ◽  
One Step ◽  
Solid Phases

The tetrafluoroborate of hexadimethylsulfoxidemanganese(II) was synthesized and studied by differential scanning calorimetry. Five solid phases of [Mn(DMSO)6](BF4)2 were revealed. Specifically, four phase transitions of the first order were detected between the following solid phases: stable KIb↔stable KIa at TC4 = 215 K; metastable KIII↔overcooled K0 at TC3 = 354 K; metastable KII↔overcooled K0 at TC2 =377 K; stable KIa→stable K0 at TC1 =385 K. [Mn(DMSO)6](BF4)2 starts to decompose at 400 K with a loss of one DMSO molecule per formula unit and forms [Mn(DMSO)5](BF4)2 which next decomposes in one step to MnF2 at the temperature range of 460 - 583 K. From the entropy changes it can be concluded that the phases K0 and metastable KII are orientationally dynamically disordered (ODDIC) crystals. The stable phases KIb and KIa are ordered solid phases.

scholarly journals Enthalpies of Combustion and Formation of Histidine Stereoisomers

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
A. Neacsu ◽  
D. Gheorghe ◽  
I. Contineanu ◽  
A. M. Sofronia ◽  
F. Teodorescu ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystalline State ◽  
Enthalpies Of Formation ◽  
Racemic Mixture ◽  
Group Additivity ◽  
Scanning Calorimetry ◽  
Combustion Energy ◽  
Temperature Range ◽  
Decomposition Reactions ◽  
The Stability

The combustion energy of histidine enantiomers (L and D) and of their racemic mixture was measured experimentally. The following values for the enthalpies of formation corresponding to the crystalline state were derived (L = −451.7, D = −448.7, DL = −451.5 kJ·mol−1), and information concerning their stability was obtained by correlating the values of the above thermochemical quantity with the structure of the molecules by using the group additivity scheme. The samples were characterized using a simultaneous thermogravimetry (TG) coupled with differential scanning calorimetry (DSC) techniques in the temperature range between ambient and beyond melting-decomposition, and the corresponding parameters were calculated. The high values of the decomposition temperatures highlight the stability of the compounds. The decomposition reactions are discussed in terms of DSC and TG data, obtained by us and other researchers.

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