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Abstract
金沢大学新学術創成研究機構ナノ生命科学研究所
Sodium chloride (NaCl) aqueous solution becomes NaCl hydrate, NaCl·2H2O, at low temperature, which is different from potassium chloride and is a typical complex model for studying the freeze-drying process in foods and pharmaceuticals. Here, we detected unit-cell-sized NaCl particles in ice as precursor substances of NaCl·2H2O during freezing of NaCl solution by using terahertz (THz) spectroscopy. In the freezing process, Na+ and Cl– ions form two types of metastable unit-cell-sized NaCl particles on the pathway to the well-known NaCl·2H2O crystal production, which are not listed in the phase diagram of freezing of NaCl solution but have absorption peaks in THz spectra. This finding of single unit-cell-sized particles signifies the importance of studying the freeze-drying process in-depth and offers a new possibility for the development of freeze-drying technology for the manufacture of nanometer-sized particles such as ultrafine pharmaceutical powders, which more readily dissolve in water.
Embargo Period 12 months
Journal
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- Journal of the American Chemical Society
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Journal of the American Chemical Society 140 (42), 13793-13797, 2018-10-12
American Chemical Society
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Details 詳細情報について
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- CRID
- 1390572175152381312
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- NII Article ID
- 120006602137
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- NII Book ID
- AA00692602
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- ISSN
- 00027863
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- Web Site
- http://hdl.handle.net/2297/00053805
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- CiNii Articles