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Ethanol and water are the primary components of liquor. In this study, molecular dynamics (MD) simulations and density functional theory (DFT) were used to model ethanol-water clusters and infer possible structures of ethanol-water solutions. Nuclear magnetic resonance (NMR) and density of states analysis were employed to confirm the existence of clusters and further describe their properties. By comparing binding energies and calculating coordination numbers, we found that the ethanol-water solution with a molecular ratio of 1:2 forms three stable clusters. Under ideal conditions, the cluster ratio is approximately 1:1:6. Generally, the clusters undergo continuous splitting and recombination.
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http://dx.doi.org/10.1016/j.jmgm.2024.108864 | DOI Listing |
J Phys Chem A
July 2025
School of Life and Health Sciences, Hubei University of Technology, Nanli Road 28, Hongshan District, Wuhan 430068, China.
Conventional solvents such as water and ethanol exhibit anomalous physicochemical properties in binary ethanol-water solutions, including negative relative partial molar volumes and maxima viscosity, which challenge classical equilibrium thermodynamics. While prior studies have attempted to explain these phenomena through hydrogen-bonding network behavior, experimental evidence remains insufficient. This study investigates structure characteristics of ethanol self-assembly clusters driven by hydrogen bonding, employing ethanol dehydrogenase assays, electrochemical voltammetry, electrospray ionization-mass spectrometry (ESI-MS), and micro-oxygen bomb calorimetry to verify structural features across self-assembling ethanol molecules.
View Article and Find Full Text PDFPharmaceutics
April 2025
Department of Chemistry, College of Sciences, Persian Gulf University, Boushehr 75168, Iran.
Hydrophobic ion pairing is a technique for reducing the hydrophilicity of charged molecules (drugs) by pairing them with oppositely charged hydrophobic counterions. This method is used to control the solubility of charged molecules in a solvent and is of particular importance in drug delivery. Dissipative particle dynamics simulations were performed to provide a microscopic understanding of hydrophobic ion pairing in polymyxin B (PMB) and oleate (OA) ions.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002.
Separation of ethanol/water or benzene/methanol azeotrope mixtures presents significant challenges, not only due to the limitations of conventional distillation techniques but also because of the constraints in developing and utilizing of new generation adsorbents. Porous organic molecular frameworks constructed via noncovalent π-interactions are emerging as novel adsorbents with vast potential in gas adsorption and molecular separation. Herein, we report a permanent two-dimensional porous structure, namely TDTBA-1, which consists of two different kinds of pores through π-stacking of a single organic molecule with highly T symmetry.
View Article and Find Full Text PDFJ Mol Graph Model
December 2024
Key Laboratory of Brewing Biotechnology and Application of Sichuan Province, Yibin, 644000, China.
Biomacromolecules
September 2024
Cluster for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
Reversible addition-fragmentation chain transfer (RAFT) dispersion polymerization-induced self-assembly (PISA) was conducted in the presence of poly(methyl methacrylate) (PMMA) stabilizer in ethanol/water mixture (80/20 by volume). Two different systems were explored by utilizing (i) 2-ethylhexyl methacrylate (EHMA) and (ii) -butyl methacrylate (BMA). The morphology transitions of these systems were investigated by varying the polymerization conditions, i.
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