Topic
Differential scanning calorimetry
About: Differential scanning calorimetry is a research topic. Over the lifetime, 50315 publications have been published within this topic receiving 1152335 citations. The topic is also known as: DSC.
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TL;DR: In this paper, the authors measured the reaction heat of the mixture of Mg(NH2)2 and 2LiH in a differential scanning calorimeter, and the overall reaction heat measured in the differential scan was 44.1 kJ/mol H 2, while the heat-of-desorption of H2 in the higher pressure plateau was 38.9kJ/m H 2.
255 citations
TL;DR: The phase transition of gels containing N-isopropylacrylamide (NIPA) was investigated by differential scanning calorimetry (DSC) and swelling measurements as discussed by the authors.
Abstract: The phase transition of gels containing N-isopropylacrylamide (NIPA) was investigated by differential scanning calorimetry (DSC) and swelling measurements. The enthalpy of dissociation of the hydro...
255 citations
TL;DR: The experimental heat capacity of liquid PLA can be expressed by Cp(liquid)=(12017+0076T) J(lactic acid)−K−1−1··−mol−1 and has been compared to the ATHAS Data Bank, using contributions of other polymers with the same constituent groups.
255 citations
TL;DR: In this paper, the segmental orientation in unoriented polyester films induced by argon ion laser irradiation has been followed and an irradiation-dependent order parameter for the cyanoazobenzene mesogens calculated.
Abstract: New side-chain liquid crystalline polyesters have been prepared by melt transesterification of diphenyl tetradecanedioate and a series of mesogenic 2-[ω-[4-[(4-cyanophenyl)azo]phenoxy]alkyl]-1,3-propanediols, where the alkyl spacer is hexa-, octa-, and decamethylene in turn. The polyesters have molecular masses in the range 5000-89 000. Solution 13 C NMR spectroscopy has been employed to identify carbons of polyester repeat units and of both types of end groups. Polyester phases and phase transitions have been investigated in detail by polarizing optical microscopy and differential scanning calorimetry for the hexamethylene spacer architecture with different molecular masses. Using FTIR polarization spectroscopy, the segmental orientation in unoriented polyester films induced by argon ion laser irradiation has been followed and an irradiation-dependent order parameter for the cyanoazobenzene mesogens calculated. FTIR is also utilized to follow the temperature-dependent erasure of the induced orientation. Optical storage properties of thin unoriented polyester films are examined through measurements of polarization anisotropy and holography. A resolution of over 5000 lines/mm and diffraction efficiencies of about 40% have been achieved. Lifetimes greater than 30 months for information stored have been obtained, even though the glass transition temperatures are about 20 °C. Complete erasure of the information can be obtained by heating the films to about 80 °C, and the films can be reused many times without fatigue.
254 citations
TL;DR: In this article, the effect of pH on the heat stability of fababean protein was studied using differential scanning calorimetry (DSC), and the irreversibility of this phenomenon in the alkaline region was demonstrated by DSC of alkaline extracted, isoelectrically precipitated Fababean proteins isolates.
Abstract: Heat denaturation of several proteins from plant sources was studied using differential scanning calorimetry (DSC). Differences in temperatures of denaturation (Td), overall thermal transitions (ΔH), and half band widths (HBW) were noted for these proteins, with oats having the highest Td (112°C) and ΔH (4.45 cal·g −1 ) and the lowest HBW (9.2°C). Vital gluten, on the other hand, did not exhibit a characteristic thermogram so these parameters could not be measured. Using fababean protein as a model system, heat denaturation was shown to be irreversible. The effect of pH on the heat stability of the fababean protein indicated decreases in Td and ΔH on either side of the isoelectric point to a situation where the protein was believed to be completely denatured if the pH were taken below pH 2.5 or above 11.5. The irreversibility of this phenomenon in the alkaline region was demonstrated by DSC of alkaline extracted, isoelectrically precipitated fababean protein isolates.
254 citations