Authors:
T. Furuki Tokyo Institute of Technology Center for Biological Resources and Informatics B-62 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8501 Japan

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R. Abe Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan

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H. Kawaji Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan

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T. Atake Tokyo Institute of Technology Materials and Structures Laboratory 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8503 Japan

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M. Sakurai Tokyo Institute of Technology Center for Biological Resources and Informatics B-62 4259 Nagatsuta-cho, Midori-ku Yokohama 226-8501 Japan

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Abstract  

The phase transitions of α,α-trehalose dihydrate (Th) were investigated by either differential thermal analysis (DTA) with an in-house apparatus of variable-pressure type equipped with an open sample holder or commercially available TG (thermal gravimetry)-DTA apparatus for comparison under the same experimental conditions as to the heating rate (2°C min−1), the type of pan (open), and the particle size of Th (63 μm). The former DTA measurements were carried out under five different total pressures, 101, 75, 61, 48 and 35 kPa, which provided quite helpful information necessary for confirmative assignments of the endothermic peaks due to either melting or dehydration of Th. The usage of largely different amount of Th, 126 and 14 mg for the DTA and TG-DTA measurements respectively, led to their different DTA traces, showing that there were largely different extents of the influence by the measured sample surface exposed to the surrounding atmosphere on its dehydration behavior. In addition the high thermal sensitivity achieved with such mass of Th gave rise to an interesting discovery of an unidentified thermal event at 92°C prior to either melting or dehydration of Th.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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