研究目的
Understanding the effects of chlorine ion on water structure from a Raman spectroscopic investigation up to 573 K.
研究成果
Cl? breaks the tetrahedral hydrogen bonding structure and bonds with water molecules in non-tetrahedral configurations, particularly the single donor form. KCl reduces hydrogen bonding at low temperatures but promotes it at temperatures above ~413 K, as indicated by spectral shifts and fitting analysis.
研究不足
The interpretation scheme is approximated as the effects of Na+/K+ ions on water structure cannot be completely neglected but are not effectively analyzed by Raman spectral data. The study does not constrain the coordination number of water molecules around ions.
1：Experimental Design and Method Selection:
The study uses Raman spectroscopy to investigate the OH stretch band features of aqueous KCl-H2O solutions at temperatures from 303 to 573 K. The method is selected for its sensitivity to local water molecule environments.
2：Sample Selection and Data Sources:
Aqueous KCl-H2O solutions with KCl concentrations from 0 to 4.0 mol/kg were prepared using second deionized water and KCl (A.R.) purchased from Sinopharm Chemical Reagent Co., Ltd.
3：0 mol/kg were prepared using second deionized water and KCl (A.R.) purchased from Sinopharm Chemical Reagent Co., Ltd.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Fused silica capillary tubes (FSCT) with 650 μm OD, 200 μm ID; Linkam THMS 600 heating-cooling stage; JY/Horiba XploRA PLUS Raman system with a 532.16 nm laser, 50× long-work-distance Olympus objective, and 1200-groove/mm grating; software GRAMS/AI and Jandel Scientific PeakFit for data analysis.
4：16 nm laser, 50× long-work-distance Olympus objective, and 1200-groove/mm grating; software GRAMS/AI and Jandel Scientific PeakFit for data analysis.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Samples were sealed in FSCT tubes, placed in the heating stage, and Raman spectra were collected in the range of ~1800-4000 cm?1 with acquisition times of 60-100 seconds and two accumulations per spectrum. Temperature was controlled with ±0.1 K accuracy.
5：1 K accuracy.
Data Analysis Methods:
5. Data Analysis Methods: Spectra were fitted using Gaussian components with software to determine peak positions, intensities, and hydrogen bonding parameters.
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