Simultaneous XRD-DSC Measurements of Water-2-Propanol at Sub-Zero Temperatures

Nishimoto, Yuko; Kaneki, Yoichi; Kishi, Akira

doi:10.2116/analsci.20.1079

Cited by 12 publications

(13 citation statements)

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“…The results cited above applied to MC hydrogel containing salt. Fig.6 shows the DSC melting curves of eutectics of water and alkali chloride 6,7 . The melting temperature of eutectic in the MC-salt -water system was agreed with that of eutectic in the salt-water system.…”

Section: Experimaentalmentioning

confidence: 99%

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Water State in Methyl cellulose Thermo Reversible Hydrogels Containing Salt and Polyethylene Glycol

Uehara

Shimoda

Iitaka

et al. 2013

Trans. Mat. Res. Soc. Japan

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Methyl cellulose (MC) and Polyethylene Glycol (PEG) were considered to be environmentally and biologically friendly materials, and have been applied to industrial or biological use as a highly hydrophilic and viscous polymer. PEG-water systems in various molar ratios of ethylene oxide (constitutional repeating unit of PEG) to H2O were investigated by DSC, NIR (Near infrared spectroscopy) and 17 O NMR, in order to investigate the behavior of water molecules in PEG hydrogel. The melting behavior of eutectic of PEG and water by DSC shows good agreement with those of NIR, NMR measurements. Alkali chloride aqueous solution forms a eutectic at low temperature. In this study, we focused on the MC -PEG-water system and MC-alkali chloride-water system at the water-rich region. The water state or the dynamic mechanical property was investigated. The PEG-MC-water system and MC-alkali chloride-water system form thermo reversible gel in the heating process. We found that the memory of the gel state was kept for 3 days after gelation at room temperature. The period of keeping the memory of the gel state after gelation agreed with the strength of PEG or Alkali chloride -water interaction. It was found that the interaction was detectable by DSC.

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Section: Experimaentalmentioning

confidence: 99%

“…PEG-water system forms a eutectic of PEG and water at lower temperature 4 . In the case of ethanol or 1-propanol aqueous solutions, the water-alcohol interaction can be detected by examining the melting enthalpy of a eutectic of alcohol and water 5,6 . Alkali chloride-MC-water system forms a thermo reversible gel in heating too.…”

Section: Introductionmentioning

confidence: 99%

Water State in Methyl cellulose Thermo Reversible Hydrogels Containing Salt and Polyethylene Glycol

Uehara

Shimoda

Iitaka

et al. 2013

Trans. Mat. Res. Soc. Japan

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“…5, 24.1, 25.8, 33.4, 39.8 [deg] were observed during the experiment. All diffraction peaks could be indexed to the standard hexagonal ice (Nishimoto, Y.;Kaneki, Y. & Kishi, A.…”

Section: Simultaneous Xrd-dsc Analysismentioning

confidence: 99%

Glass Transition Behavior of Aqueous Solution of Sugar-Based Surfactants

Ogawa¹,

Osanai²

2012

Supercooling

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“…22 In the case of ethanol or 1-propanol aqueous solutions, the water-alcohol interaction can be detected by the examination of the melting enthalpy of a eutectic of alcohol and water. 23,24 With heating, the MC-alkali chloride-water system forms a thermo-reversible gel. Alkali chloride aqueous solutions form a eutectic of alkali chloride and water, and amino acids, sugars, and some organic compounds dissolved in eutectics of salt and water.…”

Section: Introductionmentioning

confidence: 99%