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Free Content Physical states of aqueous solutions of oxyethylated glycerol with polymerization degree of n = 30 at temperatures lower than 283 K

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A binary system water–oxyethylated glycerol with polymerization degree of n=30 (OEGn=30) is studied over the concentration range of 0-100% (w/w) and the temperature range of 123 -283 K by differential scanning calorimetry (DSC). A phase diagram of this system is constructed at the average cooling rate of 200 min−1 and the warming rate of 0.5 min−1. Ice crystallization occurs and 70% (w/w) unfrozen residues remain during cooling in the OEGn=30 concentration range of 0-45% (w/w). The system hardens in the amorphous state during cooling and ice crystallization occurs during warming in the range of 46-62% (w/w). Crystallization is observed neither during the cooling nor the subsequent warming in the range of 63-74% (w/w). OEGn=30 crystallization occurs in the range of 75-100% (w/w). Each OEGn=30 molecule can strongly bind to 48 water molecules. In parallel with DSC study, the water–OEGn=30 system is investigated by cryomicroscopy in the temperature range of 173-283. Cryomicrographs of the solidified solutions representing each of the four concentration bands mentioned above are given.

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Keywords: CRYOMICROSCOPY; DSC; GLASS TRANSITION; LOW TEMPERATURES; OXYETHYLATED GLYCEROL; PHASE TRANSITIONS

Document Type: Research Article

Publication date: July 1, 2007

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  • CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation

    The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.

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