{"title":"Calorimetric analysis of aqueous alcohol solutions up to 450 MPa","authors":"Jacobo Troncoso","doi":"10.1016/j.molliq.2025.127357","DOIUrl":null,"url":null,"abstract":"<div><div>Aqueous solutions of the fully miscible monohydric alcohols, namely, methanol, ethanol, 1-propanol, 2-propanol and <em>tert</em>-butanol are studied using a calorimeter able to work at pressures as high as 450 MPa. Heat capacities of the solutions are determined from the experiments. Apparent heat capacity is calculated from these data. The sharp enhancement of this quantity at low concentrations, typical of amphiphiles such as alcohols, is analyzed against pressure and temperature. Solid-liquid phase equilibria are detected at high pressure for the heaviest alcohols. Remarkably, strong increments in the melting temperature, as compared with those found for atmospheric pressure, are found for solutions at 450 MPa. The results are discussed in terms of the interactions between water and alcohols and the role that hydrophobicity plays in these solutions.</div></div>","PeriodicalId":371,"journal":{"name":"Journal of Molecular Liquids","volume":"426 ","pages":"Article 127357"},"PeriodicalIF":5.2000,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Molecular Liquids","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167732225005240","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/10 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Aqueous solutions of the fully miscible monohydric alcohols, namely, methanol, ethanol, 1-propanol, 2-propanol and tert-butanol are studied using a calorimeter able to work at pressures as high as 450 MPa. Heat capacities of the solutions are determined from the experiments. Apparent heat capacity is calculated from these data. The sharp enhancement of this quantity at low concentrations, typical of amphiphiles such as alcohols, is analyzed against pressure and temperature. Solid-liquid phase equilibria are detected at high pressure for the heaviest alcohols. Remarkably, strong increments in the melting temperature, as compared with those found for atmospheric pressure, are found for solutions at 450 MPa. The results are discussed in terms of the interactions between water and alcohols and the role that hydrophobicity plays in these solutions.
期刊介绍：
The journal includes papers in the following areas:
– Simple organic liquids and mixtures
– Ionic liquids
– Surfactant solutions (including micelles and vesicles) and liquid interfaces
– Colloidal solutions and nanoparticles
– Thermotropic and lyotropic liquid crystals
– Ferrofluids
– Water, aqueous solutions and other hydrogen-bonded liquids
– Lubricants, polymer solutions and melts
– Molten metals and salts
– Phase transitions and critical phenomena in liquids and confined fluids
– Self assembly in complex liquids.– Biomolecules in solution
The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include:
– Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.)
– Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.)
– Light scattering (Rayleigh, Brillouin, PCS, etc.)
– Dielectric relaxation
– X-ray and neutron scattering and diffraction.
Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.
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