1
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Milovanović MR, Zarić SD. New Aspects of Alcohol-Alcohol and Alcohol-Water Interactions: Crystallographic and Quantum Chemical Studies of Antiparallel O-H/O-H Interactions. J Phys Chem Lett 2024; 15:1294-1304. [PMID: 38284997 DOI: 10.1021/acs.jpclett.3c03399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
New modes of interaction, antiparallel O-H/O-H interactions of alcohol-alcohol dimers and alcohol-water dimers, were studied by analyzing data in the Cambridge Structural Database (CSD) and by calculating potential energy surfaces at a very accurate quantum chemical CCSD(T)/CBS level. The data reveal the existence of antiparallel interactions in crystal structures and significant interaction energies. Data from the CSD for alcohol-alcohol dimers show 49.2% of contacts with classical hydrogen bonds and 10.1% of contacts with antiparallel interactions, while for alcohol-water dimers, 59.4% of contacts are classical hydrogen bonds and only 0.6% of contacts are antiparallel interactions. The calculations were performed on methanol, ethanol, and n-propanol dimers. Classical hydrogen-bonded alcohol-alcohol and alcohol-water dimers have interaction energies of up to -6.2 kcal/mol and up to -5.5 kcal/mol, respectively. Antiparallel interactions in alcohol-alcohol and alcohol-water dimers have interaction energies of up to -4.7 kcal/mol and up to -4.4 kcal/mol, respectively. Symmetry-adapted perturbation theory analysis for antiparallel interactions shows their electrostatic nature.
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Affiliation(s)
- Milan R Milovanović
- Innovative Centre of the Faculty of Chemistry, Studentski trg 12-16, Belgrade 11000, Serbia
| | - Snežana D Zarić
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade 11000, Serbia
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2
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Yang B, Ren P, Xing L, Wang S, Sun C. Roles of hydrogen bonding interactions and hydrophobic effects on enhanced water structure in aqueous solutions of amphiphilic organic molecules. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 296:122605. [PMID: 37004424 DOI: 10.1016/j.saa.2023.122605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 02/15/2023] [Accepted: 03/06/2023] [Indexed: 06/19/2023]
Abstract
Insights into the solute-induced water structural transformations are essential to understand the role of water in biological and chemical reaction processes. Herein, the structural changes in water induced by amphiphilic organic molecules were investigated using concentration-dependent derivative Raman spectroscopy (DRS) combined with two-dimensional Raman correlation spectroscopy (2D Raman-COS). We shall restrict our attention in this work to binary mixtures of water with dimethyl sulfoxide (DMSO), acetone, and isopropanol (IPA), all of which have similar chemical structures. The spectral changes in O:H and OH stretching modes illustrate that the solute molecules induce an enhancement of the water structure in dilute solutions, where the enhanced degree of water structure is closely related to the size of the dipole moment of organic molecules. In addition, the transformations of solute-induced water-specific structures were evaluated by 2D Raman-COS, which shows that the strong hydrogen bond (H-bond) structure of water is more sensitive to organic molecules and induces a transition to the weak H-bond structure of water.
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Affiliation(s)
- Bo Yang
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Panpan Ren
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Lu Xing
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China.
| | - Shenghan Wang
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.
| | - Chenglin Sun
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China; Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.
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3
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Nagasaka M. Carbon K-edge x-ray absorption spectra of liquid alcohols from quantum chemical calculations of liquid structures obtained by molecular dynamics simulations. J Chem Phys 2023; 158:024501. [PMID: 36641387 DOI: 10.1063/5.0131017] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
For reproducing the carbon K-edge x-ray absorption spectra of liquid alcohols, inner-shell quantum chemical calculations based on the Hartree-Fock method were performed with the snapshots of the liquid structures obtained by molecular dynamics simulations. The C K-edge inner-shell spectrum of liquid ethanol (EtOH) was obtained by the summation of one thousand calculated spectra of EtOH molecules including neighbor EtOH molecules within the CH2-CH2 distance of 6 Å. For the C K-edge inner-shell spectrum of liquid methanol (MeOH), we have calculated one thousand spectra of MeOH molecules including neighbor MeOH molecules within the CH3-CH3 distance of 6 Å. The calculated C K-edge inner-shell spectra of liquid alcohols well reproduced the spectral shapes of the experimentally obtained x-ray absorption spectra and the spectral changes from gas to liquid phases.
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Affiliation(s)
- Masanari Nagasaka
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan and SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
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4
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Michael KH, Su ZM, Wang R, Sheng H, Li W, Wang F, Stahl SS, Jin S. Pairing of Aqueous and Nonaqueous Electrosynthetic Reactions Enabled by a Redox Reservoir Electrode. J Am Chem Soc 2022; 144:22641-22650. [PMID: 36451553 PMCID: PMC9900757 DOI: 10.1021/jacs.2c09632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Paired electrolysis methods are appealing for chemical synthesis because they generate valuable products at both electrodes; however, development of such reactions is complicated by the need for both half-reactions to proceed under mutually compatible conditions. Here, a modular electrochemical synthesis (ModES) strategy bypasses these constraints using a "redox reservoir" (RR) to pair electrochemical half-reactions across aqueous and nonaqueous solvents. Electrochemical oxidation reactions in organic solvents, the conversion of 4-t-butyltoluene to benzylic dimethyl acetal and aldehyde in methanol or the oxidative C-H amination of naphthalene in acetonitrile, and the reduction of oxygen to hydrogen peroxide in water were paired using nickel hexacyanoferrate as an RR that can selectively store and release protons (and electrons) while serving as the counter electrode for these reactions. Selective proton transport through the RR is optimized and confirmed to enable the ion balance, and thus the successful pairing, between redox half-reactions that proceed with different rates, on different scales, and in different solvents (methanol, acetonitrile, and water).
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Affiliation(s)
- Katelyn H. Michael
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Zhi-Ming Su
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Rui Wang
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Hongyuan Sheng
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Wenjie Li
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Fengmei Wang
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.,State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Shannon S. Stahl
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Song Jin
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
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5
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Carravetta V, Gomes AHDA, Marinho RDRT, Öhrwall G, Ågren H, Björneholm O, de Brito AN. An atomistic explanation of the ethanol-water azeotrope. Phys Chem Chem Phys 2022; 24:26037-26045. [PMID: 36268753 DOI: 10.1039/d2cp03145k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ethanol and water form an azeotropic mixture at an ethanol molecular percentage of ∼91% (∼96% by volume), which prohibits ethanol from being further purified via distillation. Aqueous solutions at different concentrations in ethanol have been studied both experimentally and theoretically. We performed cylindrical micro-jet photoelectron spectroscopy, excited by synchrotron radiation, 70 eV above C1s ionization threshold, providing optimal atomic-scale surface-probing. Large model systems have been employed to simulate, by molecular dynamics, slabs of the aqueous solutions and obtain an atomistic description of both bulk and surface regions. We show how the azeotropic behaviour results from an unexpected concentration-dependence of the surface composition. While ethanol strongly dominates the surface and water is almost completely depleted from the surface for most mixing ratios, the different intermolecular bonding patterns of the two components cause water to penetrate to the surface region at high ethanol concentrations. The addition of surface water increases its relative vapour pressure, giving rise to the azeotropic behaviour.
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Affiliation(s)
- Vincenzo Carravetta
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy.
| | - Anderson Herbert de Abreu Gomes
- Dept. of Applied Physics, Institute of Physics "Gleb Wataghin", Campinas University, CEP: 13083-859 Campinas, SP, Brazil. .,Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research on Energy and Materials (CNPEM), PO Box 6192, 13083-970, Campinas, SP, Brazil
| | - Ricardo Dos Reis Teixeira Marinho
- Institute of Physics, Federal University of Bahia, 40.170-115, Salvador, BA, Brazil.,Institute of Physics, Brasilia University (UnB), 70.919-970, Brasília, Brazil
| | - Gunnar Öhrwall
- MAX IV Laboratory, Lund University, Box 118, SE-22100 Lund, Sweden
| | - Hans Ågren
- Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Olle Björneholm
- Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Arnaldo Naves de Brito
- Dept. of Applied Physics, Institute of Physics "Gleb Wataghin", Campinas University, CEP: 13083-859 Campinas, SP, Brazil.
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6
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Besford QA, Van den Heuvel W, Christofferson AJ. Dipolar Dispersion Forces in Water-Methanol Mixtures: Enhancement of Water Interactions upon Dilution Drives Self-Association. J Phys Chem B 2022; 126:6231-6239. [PMID: 35976055 DOI: 10.1021/acs.jpcb.2c04638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mixtures of short-chain alcohols and water produce anomalous thermodynamic and structural quantities, including molecular segregation into water-rich and alcohol-rich components. Herein, we used molecular dynamics simulations with polarizable models to investigate interactions that could drive the self-association of water molecules in mixtures with methanol (MeOH). As water was diluted with MeOH, significant changes in the distribution of molecules and solvation properties occurred, where water exhibited a clear preference for self-association. When common structural quantities were analyzed, it was found that there was a clear reduction in water-water hydrogen bonding and tetrahedral order (both in terms of typical bulk behavior), contrary to the observed water self-association. However, when dipolar dispersion forces between all molecules as a function of system composition were analyzed, it was found that water-water dipolar interactions became significantly stronger with dilution (6-fold stronger interaction in 75% MeOH compared to 0% MeOH). This was only observed for water, where MeOH-MeOH interactions became weaker as the systems were more dilute in MeOH. These forces result from specific dipole orientations, likely occurring to adopt lower energy configurations (i.e., head-to-tail or antiparallel). For water, this may result from lost other interactions (e.g., hydrogen bonding), leading to more rotational freedom between the dipole moments. These intriguing changes in dipolar interactions, which directly result from structural changes, can therefore explain, in part, the driving force for water self-association in MeOH-water mixtures.
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Affiliation(s)
- Quinn A Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Willem Van den Heuvel
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, DK-5230 Odense M, Denmark
| | - Andrew J Christofferson
- School of Science, STEM College, RMIT University, Melbourne, Victoria 3001, Australia.,ARC Centre of Excellence in Exciton Science, School of Science, RMIT University, Melbourne, Victoria 3001, Australia
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7
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Dueby S, Dubey V, Indra S, Daschakraborty S. Non-monotonic composition dependence of the breakdown of Stokes-Einstein relation for water in aqueous solutions of ethanol and 1-propanol: explanation using translational jump-diffusion approach. Phys Chem Chem Phys 2022; 24:18738-18750. [PMID: 35900000 DOI: 10.1039/d2cp02664c] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of experimental and simulation studies examined the validity of the Stokes-Einstein relationship (SER) of water in binary water/alcohol mixtures of different mixture compositions. These studies revealed a strong non-monotonic composition dependence of the SER with maxima at the specific alcohol mole fraction where the non-idealities of the thermodynamic and transport properties are observed. The translational jump-diffusion (TJD) approach elucidated the breakdown of the SER in pure supercooled water as caused by the jump translation of molecules. The breakdown of SER in the supercooled water/methanol binary mixture was successfully explained using the same TJD approach. To further generalize the picture, here we focus on the non-monotonic composition dependence of SER breakdown of water in two water/alcohol mixtures (water/ethanol and water/propanol) for a broad temperature range. In agreement with previous studies, maximum breakdown of SER is observed for the mixture with alcohol mole fraction x = 0.2. Diffusion of the water molecules at the maximum SER breakdown point is largely contributed by jump-diffusion. The residual-diffusion, obtained by subtracting the jump-diffusion from the total diffusion, approximately follows the SER for different compositions and temperatures. We also performed hydrogen (H-)bond dynamics and observed that the contribution of jump-diffusion is proportional to the total free energy of activation of breaking all H-bonds that exist around a molecule. This study, therefore, suggests that the more a molecule is trapped by H-bonding, the more likely it is to diffuse through the jump-diffusion mechanism, eventually leading to an increasing degree of SER breakdown.
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Affiliation(s)
- Shivam Dueby
- Department of Chemistry, Indian Institute of Technology Patna, Bihar 801106, India.
| | - Vikas Dubey
- Department of Chemistry, Indian Institute of Technology Patna, Bihar 801106, India.
| | - Sandipa Indra
- Department of Chemistry, Indian Institute of Technology Patna, Bihar 801106, India.
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8
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Nagasaka M, Bouvier M, Yuzawa H, Kosugi N. Hydrophobic Cluster Formation in Aqueous Ethanol Solutions Probed by Soft X-ray Absorption Spectroscopy. J Phys Chem B 2022; 126:4948-4955. [PMID: 35748647 DOI: 10.1021/acs.jpcb.2c02990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrophobic cluster structures in aqueous ethanol solutions at different concentrations have been investigated by soft X-ray absorption spectroscopy (XAS). In the O K-edge XAS, we have found that hydrogen bond structures among water molecules are enhanced in the middle-concentration region by the hydrophobic interaction of the ethyl groups in ethanol. In the C K-edge XAS, the lower energy features arise from a transition from the terminal methyl C 1s electron to an unoccupied orbital of 3s Rydberg character, which is sensitive to the nearest-neighbor intermolecular interactions. From the comparison of C K-edge XAS with the inner-shell calculations, we have found that ethanol clusters are easily formed in the middle-concentration region due to the hydrophobic interaction of the ethyl group in ethanol, resulting in the enhancement of the hydrogen bond structures among water molecules. This behavior is different from aqueous methanol solutions, where the methanol-water mixed clusters are more predominant in the middle-concentration region due to the relatively weak hydrophobic interactions of the methyl group in methanol.
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Affiliation(s)
- Masanari Nagasaka
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
| | - Mathilde Bouvier
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Hayato Yuzawa
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Nobuhiro Kosugi
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
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9
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Demirel HS, Svärd M, Uysal D, Doğan ÖM, Uysal BZ, Forsberg K. Antisolvent crystallization of battery grade nickel sulphate hydrate in the processing of lateritic ores. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120473] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Trabelsi S, Tlili M, Abdelmoulahi H, Bouazizi S, Nasr S, González MA, Bellissent-Funel MC, Darpentigny J. Intermolecular interactions in an equimolar methanol-water mixture: Neutron scattering, DFT, NBO, AIM, and MD investigations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118131] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Yamamura R, Yamazoe K, Miyawaki J, Harada Y, Takahashi O. Identification of Valence Electronic States Reflecting the Hydrogen Bonding in Liquid Ethanol. J Phys Chem B 2022; 126:1101-1107. [PMID: 35104123 DOI: 10.1021/acs.jpcb.1c09272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The temperature-dependent X-ray emission spectra of liquid ethanol were calculated theoretically using a semi-classical approximation to the Kramers-Heisenberg formula, which includes the dynamical effects induced by a core-hole. Soft X-ray emission spectroscopic measurements were performed to discern the changes in the hydrogen bonding (h-bonding) structure of liquid ethanol using a temperature-controlled liquid cell at 241 and 313 K. The relative intensities of the peaks at approximately 526.5 and 527.1 eV varied with temperature, and the corresponding behavior was reproduced theoretically, although the variation with temperature in the calculated spectra were more enhanced than that in the experiment. The two peaks can be attributed to the 3a″ + 10a' mixed state and pure 3a″ state, respectively, depending on the behavior of the local h-bonding structure. The splitting of the 3a″ component occurred because of the h-bonding behavior of liquid ethanol. Furthermore, the size of the ethanol cluster decreased with an increase in temperature, mainly due to the breaking of the one-donor/one-acceptor type h-bonding. Our studies suggest that the electronic state of liquid ethanol reflects several types of h-bonding structures, and the ratios of these h-bonding types vary with temperature.
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Affiliation(s)
- Ryosuke Yamamura
- Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - Kosuke Yamazoe
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.,Synchrotron Radiation Research Organization, University of Tokyo, Sayo-cho, Sayo, Hyogo 679-5198, Japan
| | - Jun Miyawaki
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.,Synchrotron Radiation Research Organization, University of Tokyo, Sayo-cho, Sayo, Hyogo 679-5198, Japan
| | - Yoshihisa Harada
- Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.,Synchrotron Radiation Research Organization, University of Tokyo, Sayo-cho, Sayo, Hyogo 679-5198, Japan
| | - Osamu Takahashi
- Basic Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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12
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Effect of the alkyl chain and composition on the thermodynamics of mixing of small alcohols and water. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Weeraratna C, Amarasinghe C, Lu W, Ahmed M. A Direct Probe of the Hydrogen Bond Network in Aqueous Glycerol Aerosols. J Phys Chem Lett 2021; 12:5503-5511. [PMID: 34087076 DOI: 10.1021/acs.jpclett.1c01383] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The properties of aerosols are of paramount importance in atmospheric chemistry and human health. The hydrogen bond network of glycerol-water aerosols generated from an aqueous solution with different mixing ratios is probed directly with X-ray photoelectron spectroscopy. The carbon and oxygen X-ray spectra reveal contributions from gas and condensed phase components of the aerosol. It is shown that water suppresses glycerol evaporation up to a critical mixing ratio. A dielectric analysis using terahertz spectroscopy coupled with infrared spectroscopy of the bulk solutions provides a picture of the microscopic heterogeneity prevalent in the hydrogen bond network when combined with the photoelectron spectroscopy analysis. The hydrogen bond network is composed of three intertwined regions. At low concentrations, glycerol molecules are surrounded by water forming a solvated water network. Adding more glycerol leads to a confined water network, maximizing at 22 mol %, beyond which the aerosol resembles bulk glycerol. This microscopic view of hydrogen bonding networks holds promise in probing evaporation, diffusion dynamics, and reactivity in aqueous aerosols.
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Affiliation(s)
- Chaya Weeraratna
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Chandika Amarasinghe
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Wenchao Lu
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Musahid Ahmed
- Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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14
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Pothoczki S, Pethes I, Pusztai L, Temleitner L, Ohara K, Bakó I. Properties of Hydrogen-Bonded Networks in Ethanol-Water Liquid Mixtures as a Function of Temperature: Diffraction Experiments and Computer Simulations. J Phys Chem B 2021; 125:6272-6279. [PMID: 34078085 PMCID: PMC8279560 DOI: 10.1021/acs.jpcb.1c03122] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
New X-ray and neutron
diffraction experiments have been performed
on ethanol–water mixtures as a function of decreasing temperature,
so that such diffraction data are now available over the entire composition
range. Extensive molecular dynamics simulations show that the all-atom
interatomic potentials applied are adequate for gaining insight into
the hydrogen-bonded network structure, as well as into its changes
on cooling. Various tools have been exploited for revealing details
concerning hydrogen bonding, as a function of decreasing temperature
and ethanol concentration, like determining the H-bond acceptor and
donor sites, calculating the cluster-size distributions and cluster
topologies, and computing the Laplace spectra and fractal dimensions
of the networks. It is found that 5-membered hydrogen-bonded cycles
are dominant up to an ethanol mole fraction xeth = 0.7 at room temperature, above which the concentrated
ring structures nearly disappear. Percolation has been given special
attention, so that it could be shown that at low temperatures, close
to the freezing point, even the mixture with 90% ethanol (xeth = 0.9) possesses a three-dimensional (3D)
percolating network. Moreover, the water subnetwork also percolates
even at room temperature, with a percolation transition occurring
around xeth = 0.5.
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Affiliation(s)
- Szilvia Pothoczki
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Ildikó Pethes
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - László Pusztai
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary.,International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - László Temleitner
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Koji Ohara
- Diffraction and Scattering Division, JASRI, SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Imre Bakó
- Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
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15
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Mohammady SZ, Aldhayan DM, Hagar M. Preparation and DFT Study for New Three-Ring Supramolecular H-Bonded Induced Liquid Crystal Complexes. Front Chem 2021; 9:679528. [PMID: 34150717 PMCID: PMC8213091 DOI: 10.3389/fchem.2021.679528] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/12/2021] [Indexed: 11/27/2022] Open
Abstract
Supramolecular three-ring Schiff base novel liquid crystal complexes have been prepared and investigated. Schiff bases of para-substituted aniline derivatives and para-pyridine carbaldehyde have been prepared and then mixed in equimolar quantities with para-alkoxy benzoic acids. On one side, the alkoxy chain length varies from 8 to 16 carbon atoms. On the other side, terminal small compact groups substituting aniline with various polarities are used. Hydrogen-bonding interaction was elucidated by FTIR spectroscopy. The mesomorphic thermal and optical characteristics of the samples were obtained by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). All samples exhibit enantiotropic mesophases. Experimental results obtained for the induced mesophases were correlated with density functional theory (DFT) theoretical calculations. The results revealed that both the polar compact groups' polarity and the alkoxy chain lengths contribute strongly to mesomorphic characteristics and thermal stabilities of the mesophases. Surprisingly, the observed values of enthalpy changes associated with the crystalline mesomorphic transitions lie in the range of 2.2-12.5 kJ/mol. However, the enthalpy changes corresponding to the mesomorphic-isotropic transitions vary from 0.9 to 13.9 kJ/mol, depending on the polarity of para-attached groups to the aniline moiety.
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Affiliation(s)
- Sayed Z. Mohammady
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Daifallah M. Aldhayan
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed Hagar
- Chemistry Department, College of Sciences, Taibah University, Yanbu, Saudi Arabia
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
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16
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Hagar M, Ahmed HA, Alnoman RB, Jaremko M, Emwas AH, Sioud S, Abu Al-Ola KA. New Liquid Crystal Assemblies Based on Cyano-Hydrogen Bonding Interactions. Front Chem 2021; 9:679885. [PMID: 34150718 PMCID: PMC8213374 DOI: 10.3389/fchem.2021.679885] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/12/2021] [Indexed: 01/07/2023] Open
Abstract
A new selection of supramolecular liquid crystal complexes based on complementary molecules formed via hydrogen-bonding interactions is reported. All prepared complexes were prepared from 4-n-alkoxybenzoic acid (An) and N-4-cyanobenzylidene-4-n-(hexyloxy)benzenamine (I). FT-IR, temperature gradient NMR, Mass Spectrometer and Chromatography spectroscopy were carried out to confirm the -CN and -COOH H-bonded complexation by observing their Fermi-bands and the effects of the 1H-NMR signals as well as its elution signal from HPLC. Moreover, binary phase diagrams were established for further confirmation. All formed complexes (I/An) were studied by the use of differential scanning calorimetry and their phase properties were validated through the use of polarized optical microscopy Results of mesomorphic characterization revealed that all presented complexes exhibited enantiotropic mesophases and their type was dependent on the terminal lengths of alkoxy chains. Also, the mesomorphic temperature ranges decreased in the order I/A6 > I/A8 > I/A10 > I/A16 with linear dependency on the chain length. Finally, the density functional theory computational modeling has been carried out to explain the experimental findings. The relation between the dimensional parameters was established to show the effect of the aspect ratio on the mesophase range and stability. The normalized entropy of the clearing transitions (∆S/R) was calculated to illustrate the molecular interaction enhancements with the chain lengths.
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Affiliation(s)
- Mohamed Hagar
- College of Sciences, Chemistry Department, Yanbu, Taibah University, Yanbu, Saudi Arabia
- Faculty of Science, Chemistry Department, Alexandria University, Alexandria, Egypt
| | - Hoda A. Ahmed
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
| | - Rua B. Alnoman
- College of Sciences, Chemistry Department, Yanbu, Taibah University, Yanbu, Saudi Arabia
| | - Mariusz Jaremko
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering Division (BESE), Thuwal, Saudi Arabia
| | - Abdul-Hamid Emwas
- King Abdullah University of Science and Technology, Core Labs, Thuwal, Saudi Arabia
| | - Salim Sioud
- King Abdullah University of Science and Technology, Analytical Chemistry Core Lab, Thuwal, Saudi Arabia
| | - Khulood A. Abu Al-Ola
- College of Sciences, Chemistry Department, Madina Monawara, Taibah University, Al-Madina, Saudi Arabia
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17
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18
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Kirschner J, Gomes AHA, Marinho RRT, Björneholm O, Ågren H, Carravetta V, Ottosson N, Brito AND, Bakker HJ. The molecular structure of the surface of water-ethanol mixtures. Phys Chem Chem Phys 2021; 23:11568-11578. [PMID: 33977931 DOI: 10.1039/d0cp06387h] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mixtures of water and alcohol exhibit an excess surface concentration of alcohol as a result of the amphiphilic nature of the alcohol molecule, which has important consequences for the physico-chemical properties of water-alcohol mixtures. Here we use a combination of intensity vibrational sum-frequency generation (VSFG) spectroscopy, heterodyne-detected VSFG (HD-VSFG), and core-level photoelectron spectroscopy (PES) to investigate the molecular properties of water-ethanol mixtures at the air-liquid interface. We find that increasing the ethanol concentration up to a molar fraction (MF) of 0.1 leads to a steep increase of the surface density of the ethanol molecules, and an increased ordering of the ethanol molecules at the surface. When the ethanol concentration is further increased, the surface density of ethanol remains more or less constant, while the orientation of the ethanol molecules becomes increasingly disordered. The used techniques of PES and VSFG provide complementary information on the density and orientation of ethanol molecules at the surface of water, thus providing new information on the molecular-scale properties of the surface of water-alcohol mixtures over a wide range of compositions. This information is invaluable in understanding the chemical and physical properties of water-alcohol mixtures.
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Affiliation(s)
- Johannes Kirschner
- Ultrafast Spectroscopy, AMOLF, 1098 XG Science Park, Amsterdam, The Netherlands.
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19
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Servis MJ, Piechowicz M, Skanthakumar S, Soderholm L. Molecular-scale origins of solution nanostructure and excess thermodynamic properties in a water/amphiphile mixture. Phys Chem Chem Phys 2021; 23:8880-8890. [PMID: 33876047 DOI: 10.1039/d1cp00082a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The molecular and nanoscale origins of nonideality in excess thermodynamic properties are essential to understanding cosolvent mixtures, yet they remain challenging to determine. Here, we consider a binary mixture of water and an amphiphile, N,N,N',N'-tetramethylmalonamide (TMMA), which is characterized by strong hydrogen bonding between the two components and no hydrogen bonding between amphiphiles. Using molecular dynamics simulation, validated with excess volume measurements and X-ray scattering, we identify three distinct solution regimes across the composition range of the binary mixture and find that the transition between two of these regimes, marked by the water percolation threshold, is closely correlated with minima in the excess volume and excess enthalpy. Structural analysis of the simulations reveals an interplay between local interactions and solution nanostructure, determined by the relative strength of the water-water and water-amphiphile hydrogen bonding interactions. By comparison with other amphiphiles, such as linear alcohols, the relative strength of like and unlike interactions between water and amphiphile affects the relationship between thermodynamics and structural regimes. This provides insight into how molecular forces of mutual solvation interact across length scales and how they manifest in excess thermodynamic properties.
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Affiliation(s)
- Michael J Servis
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA.
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20
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Viscosity study of tert-butyl alcohol aqueous solution by Brownian motion and gravimetric capillaries. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114170] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Kamal NS, Alayoubi A, Elfakhri KH, Ibrahim S, Seggel M, Ashraf M, Zidan A. Effects of formulation variables on the in vitro performance of testosterone transdermal gel. Int J Pharm 2020; 590:119951. [PMID: 33035607 DOI: 10.1016/j.ijpharm.2020.119951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 09/21/2020] [Accepted: 10/02/2020] [Indexed: 10/23/2022]
Abstract
The variation in the critical formulation variables during life-cycle of the drug product may result in undesirable changes in product performance. The current study aimed at evaluating the effects of formulation variables on the in vitro performance of carbopol-loaded testosterone gel. The formulation variables included concentrations of permeation enhancers, testosterone, ethanol, carbopol and sodium hydroxide. In vitro evaluation of the product performance included assessment of the rheological and morphological properties, kinetics of ethanol evaporation, and drug permeation through human cadaver skin. The results revealed that carbopol, sodium hydroxide and testosterone concentrations increased the viscosity of the gels significantly (p < 0.05). However, carbopol concentration was the only critical variable to affect the yield stress of the gel. The concentration of ethanol was critical to metamorphosis of the gel due to solvent evaporation upon application to skin with minor contributions from other formulation variables. The increase in concentration of isopropyl myristate or isopropyl palmitate to 5%, ethanol to 70%, and testosterone to 2%, enhanced the testosterone permeation across the skin by ten-folds. Synergistic effects of ethanol and permeation enhancers on testosterone permeation was observed. In conclusion, strict control over the critical formulation variables should be exercised during manufacturing to ensure desired product performance.
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Affiliation(s)
- Nahid S Kamal
- Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Alaadin Alayoubi
- Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Khaled H Elfakhri
- Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Sarah Ibrahim
- Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Mark Seggel
- Office of New Drug Products, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Muhammad Ashraf
- Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA
| | - Ahmed Zidan
- Office of Testing and Research, Office of Pharmaceutical Quality, Center for Drug Evaluation and Research, Food and Drug Administration, MD, USA.
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22
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Al-Mutabagani LA, Alshabanah LA, Naoum MM, Hagar M, Ahmed HA. Experimental and Computational Approaches of Newly Polymorphic Supramolecular H-Bonded Liquid Crystal Complexes. Front Chem 2020; 8:571120. [PMID: 33240841 PMCID: PMC7667271 DOI: 10.3389/fchem.2020.571120] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 09/07/2020] [Indexed: 12/21/2022] Open
Abstract
New 1:2 liquid crystalline supramolecular H-bonded complexes (SMHBCs) were synthesized through double H-bond interactions between 4-(nicotinoyloxy) phenyl nicotinate as the base component and two molecules of 4-n-alkoxybenzoic acid (An). The base component was expected to be in two conformers according to the orientation of the N atom and the carboxylate group, syn conformer (I) and anti-conformer (II). DFT calculations revealed that only one of the two possible conformers of I exists, and the addition of the two molecules of the alkoxy acids (A n) did not affect its conformation. The mesomorphic properties of all of the prepared complexes (I/A n), bearing different terminal flexible alkoxy chains were investigated, and the formation of the H-bonds were confirmed by differential scanning calorimetry (DSC), and the phases were identified by polarized optical microscopy (POM), and FT-IR spectroscopy. Highly thermally stable mesophases possessing broad temperature ranges were observed for all investigated complexes compared to their individual components. Depending on the length of the terminal flexible alkoxy chain, the prepared SMHBCs were shown to exhibit di- or tri-morphic enantiotropic mesophases. The effect of replacing one of the -COO- connecting units by an azo group (-N=N-) in the basic molecule (I), on the mesomorphic properties has been investigated experimentally (via DSC) and theoretically (via DFT). The DFT calculations revealed that the polarizability, the dipole moment, and the aspect ratio of the investigated SMHBCs are lower than those of their corresponding ester/azo analogs. All these factors rationalize the enhanced smectic mesophase ranges of the complexes compared with those of the ester/azo analogs. The high aspect ratios and dipole moments of the SMHBCs of the azo derivative enforces the lateral intermolecular attraction that permits the formation of the more ordered smectic C mesophase with respect to the enhanced polymorphic mesophases of the diester derivative.
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Affiliation(s)
- Laila A. Al-Mutabagani
- Chemistry Department, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
| | | | - Magdi M. Naoum
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
| | - Mohamed Hagar
- Chemistry Department, College of Sciences, Taibah University, Yanbu, Saudi Arabia
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Hoda A. Ahmed
- Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt
- Chemistry Department, College of Sciences, Taibah University, Yanbu, Saudi Arabia
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23
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Menzi S, Knopp G, Al Haddad A, Augustin S, Borca C, Gashi D, Huthwelker T, James D, Jin J, Pamfilidis G, Schnorr K, Sun Z, Wetter R, Zhang Q, Cirelli C. Generation and simple characterization of flat, liquid jets. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:105109. [PMID: 33138597 DOI: 10.1063/5.0007228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 09/21/2020] [Indexed: 06/11/2023]
Abstract
We present an approach to determine the absolute thickness profile of flat liquid jets, which takes advantage of the information of thin film interference combined with light absorption, both captured in a single microscopic image. The feasibility of the proposed method is demonstrated on our compact experimental setup used to generate micrometer thin, free-flowing liquid jet sheets upon collision of two identical laminar cylindrical jets. Stable operation was achieved over several hours of the flat jet in vacuum (10-4 mbar), making the system ideally suitable for soft x-ray photon spectroscopy of liquid solutions. We characterize the flat jet size and thickness generated with two solvents, water and ethanol, employing different flow rates and nozzles of variable sizes. Our results show that a gradient of thickness ranging from a minimal thickness of 2 µm to over 10 µm can be found within the jet surface area. This enables the tunability of the sample thickness in situ, allowing the optimization of the transmitted photon flux for the chosen photon energy and sample. We demonstrate the feasibility of x-ray absorption spectroscopy experiments in transmission mode by measuring at the oxygen K-edge of ethanol. Our characterization method and the description of the experimental setup and its reported performance are expected to expand the range of applications and facilitate the use of flat liquid jets for spectroscopy experiments.
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Affiliation(s)
- Samuel Menzi
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Gregor Knopp
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Andre Al Haddad
- Laboratory for Advanced Photonics, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Sven Augustin
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Camelia Borca
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Dardan Gashi
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Thomas Huthwelker
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Daniel James
- Laboratory of Biomolecular Research, Biology and Chemistry Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Jiaye Jin
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Georgios Pamfilidis
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Kirsten Schnorr
- Laboratory for Advanced Photonics, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Zhibin Sun
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Reto Wetter
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Qiang Zhang
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
| | - Claudio Cirelli
- Laboratory for Synchrotron Radiation and Femtochemistry, Photon Science Division, Paul Scherrer Institut, 5232 Villigen, Switzerland
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24
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Abstract
Experimental and geometrical approaches of new systems of mesomorphic 1:1 supramolecular H-bonded complexes (SMHBCs) of five rings are discussed. The H-bonding between 4-alkoxyphenylimino benzoic acids (An, as proton acceptor) and 4-(4′–pyridylazophenyl) 4′′-alkoxybenzoates (Bm, as proton donor) were investigated. Mesomorphic behaviors were analyzed by differential scanning calorimetry (DSC) and mesophase textures were identified by polarized light microscopy (POM). H-bonded assembly was established by FT-IR spectroscopic measurements via Fermi band discussion. Thermal and theoretical factors were predicted for all synthesized complexes by density functional theory (DFT) predictions. The results revealed that all prepared complexes were monomorphic, with a broad range of smectic A phases with a high thermal stability of enantiotropic mesophase. Furthermore, DFT stimulations illustrated the experimental results in terms of the influence of the chain length either of the acid or the base component. Many parameters, such as the calculated stability, the dipole moment and the polarizability of the H-bonded complexes, illustrate how these parameters work together to enhance the smectic mesophases with the obtained stability and range.
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25
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Pethes I, Pusztai L, Ohara K, Kohara S, Darpentigny J, Temleitner L. Temperature-dependent structure of methanol-water mixtures on cooling: X-ray and neutron diffraction and molecular dynamics simulations. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113664] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Halder R, Jana B. On the Correlation between Pair Hydrophobicity and Mixing Enthalpies in Water–Alcohol Binary Mixtures. J Phys Chem B 2020; 124:8023-8031. [DOI: 10.1021/acs.jpcb.0c05952] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ritaban Halder
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Biman Jana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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27
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Precipitation and Transformation of Vaterite Calcium Carbonate in the Presence of Some Organic Solvents. MATERIALS 2020; 13:ma13122742. [PMID: 32560368 PMCID: PMC7344821 DOI: 10.3390/ma13122742] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/05/2020] [Accepted: 06/15/2020] [Indexed: 12/20/2022]
Abstract
In this paper, the production of CaCO3 particles via the carbonation route in the reaction of CaCl2 and CO2, using NH3 as a promoter of CO2 absorption, was studied. The solvents used as the reaction media for CaCO3 precipitation were aqueous solutions of methanol, isopropanol and dimethyl sulfoxide (DMSO), in a concentration range of 0–20% (v/v). It was found that the presence of an organic additive influenced the precipitation rate, the content of vaterite in the obtained product, the morphology and the size of the precipitated CaCO3 particles, as well as the rate of its transformation into calcite. The presence of all added organic solvents reduced the vaterite concentration in the produced CaCO3 both at the end of the reaction and after incubation in the reaction medium for 1 h. However, the transformation of vaterite particles into calcite in the tested solutions was slower when the 4 h and 24 h procedures were compared. The interactions of solvents with calcite and vaterite were compared using HPLC tests. DMSO molecules interacted with vaterite particles the most strongly, while the interaction of isopropanol with this polymorph was the weakest. The opposite effect was observed for interactions with calcite particles, and the affinity decreased in the series: isopropanol, methanol, DMSO.
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28
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Niebuur BJ, Ko CH, Zhang X, Claude KL, Chiappisi L, Schulte A, Papadakis CM. Pressure Dependence of the Cononsolvency Effect in Aqueous Poly(N-isopropylacrylamide) Solutions: A SANS Study. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bart-Jan Niebuur
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Chia-Hsin Ko
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Xiaohan Zhang
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Kora-Lee Claude
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Leonardo Chiappisi
- Large Scale Structures Group, Institut Laue-Langevin, 71, Avenue des Martyrs, CS 20 156, 38042 Grenoble, France
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany
| | - Alfons Schulte
- Department of Physics and College of Optics and Photonics, University of Central Florida, 4111 Libra Drive, Orlando, Florida 32816, United States
| | - Christine M. Papadakis
- Physik-Department, Fachgebiet Physik weicher Materie, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
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29
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Sapegin D, Kononova S, Gubanova G, Kruchinina E, Saprykina N, Popova E, Vlasova E. Selective facilitated fixed-site carrier transport of methanol through sulfonated copolyimide pervaporation membranes for the separation of methanol/toluene mixtures. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116274] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Alzakia FI, Sun W, Pennycook SJ, Tan SC. Introducing Normalized Centrifugation for a More Accurate Thermodynamic Analysis of Molybdenum Disulfide Dispersions: A Study on Mixed Solvents of Alcohols and Amines with Water. ACS APPLIED MATERIALS & INTERFACES 2020; 12:3096-3103. [PMID: 31847515 DOI: 10.1021/acsami.9b14510] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A more accurate solution thermodynamic analysis of colloidal molybdenum disulfide (MoS2) nanosheets dispersed in 91 combinations of organic solvent (alcohols and amines)/water mixtures is made possible by the application of a viscosity- and density-normalized centrifugation method to the post-sonication stock solution. This centrifugation method accounts the solvent mixture's density and viscosity in order to apply different centrifugation times based on Stoke's law and in effect eliminates the kinetic interferences arising from different densities and viscosities of the solvent mixtures used as the dispersing media. This allows us to reveal that the solvent's molecular size and hydrogen-bonding strength are additional important factors that determine the Gibbs free energy of mixing, other than the matching of the Hansen solubility parameters between the dispersed nanosheet and the dispersing medium. In addition, ζ potential turns out to be a negligible factor for the nanosheet dispersibility since surface charges are mainly localized on the edge sites. This is because restacking mainly occurs via the basal planes, which are virtually chargeless. This study further extends our understanding of the dispersibility mechanism of 2D nanosheets in various solvent/water mixtures.
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Affiliation(s)
- Fuad I Alzakia
- Department of Materials Science and Engineering , National University of Singapore , 9 Engineering Drive 1 , Singapore 117574
| | - Wanxin Sun
- Bruker Nano Surface Division , 11 Biopolis Way #10-10 , The Helios, Singapore 138667
| | - Stephen J Pennycook
- Department of Materials Science and Engineering , National University of Singapore , 9 Engineering Drive 1 , Singapore 117574
| | - Swee Ching Tan
- Department of Materials Science and Engineering , National University of Singapore , 9 Engineering Drive 1 , Singapore 117574
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31
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Bubble Rise Velocity and Surface Mobility in Aqueous Solutions of Sodium Dodecyl Sulphate and n-Propanol. MINERALS 2019. [DOI: 10.3390/min9120743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Aqueous solutions of simple alcohols exhibit many anomalies, one of which is a change in the mobility of the bubble surface. This work aimed to determine the effect of the presence of another surface-active agent on bubble rise velocity and bubble surface mobility. The motion of the spherical bubble in an aqueous solution of n-propanol and sodium dodecyl sulphate (SDS) was monitored by a high-speed camera. At low alcohol concentrations (xP < 0.01), both the propanol and SDS molecules behaved as surfactants, the surface tension decreased and the bubble surface was immobile. The effect of the SDS diminished with increasing alcohol concentrations. In solutions with a high propanol content (xP > 0.1), the SDS molecules did not adsorb to the phase interface and thus, the surface tension of the solution was not reduced with the addition of SDS. Due to the rapid desorption of propanol molecules from the bottom of the bubble, a surface tension gradient was not formed. The drag coefficient can be calculated using formulas for the mobile surface of a spherical bubble.
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32
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Corsaro C, Fazio E, Mallamace D. The Stokes-Einstein relation in water/methanol solutions. J Chem Phys 2019; 150:234506. [DOI: 10.1063/1.5096760] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- C. Corsaro
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno d’ Alcontres, 31, 98166 Messina, Italy
| | - E. Fazio
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno d’ Alcontres, 31, 98166 Messina, Italy
| | - D. Mallamace
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale F. Stagno d’ Alcontres, 31, 98166 Messina, Italy
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33
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Medoš Ž, Plechkova NV, Friesen S, Buchner R, Bešter-Rogač M. Insight into the Hydration of Cationic Surfactants: A Thermodynamic and Dielectric Study of Functionalized Quaternary Ammonium Chlorides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3759-3772. [PMID: 30754971 PMCID: PMC6727610 DOI: 10.1021/acs.langmuir.8b03993] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/11/2019] [Indexed: 05/31/2023]
Abstract
Hydrophobic interactions are one of the main thermodynamic driving forces in self-assembly, folding, and association processes. To understand the dehydration-driven solvent exposure of hydrophobic surfaces, the micellization of functionalized decyldimethylammonium chlorides, XC10Me2N+Cl-, with a polar functional group, X = C2OH, C2OMe, C2OC2OMe, C2OOEt, together with the "reference" compound decyltrimethylammonium chloride, C10Me3N+Cl-, was investigated in aqueous solution by density measurements, isothermal titration calorimetry (ITC), and dielectric relaxation spectroscopy (DRS). From the density data, the apparent molar volumes of monomers and micelles were estimated, whereas the ITC data were analyzed with the help of a model equation, yielding the thermodynamic parameters and aggregation number. From the DRS spectra, effective hydration numbers of the free monomers and micelles were deduced. The comprehensive analysis of the obtained results shows that the thermodynamics of micellization are strongly affected by the nature of the functional group. Surprisingly, the hydration of micelles formed by surfactant cations with a single alkyl chain on quaternary ammonium is approximately the same, regardless of the alkyl chain length or functionalization of the headgroup. However, notable differences were found for the free monomers where increasing polarity lowers the effective hydration number.
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Affiliation(s)
- Žiga Medoš
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia
| | - Natalia V. Plechkova
- QUILL,
The Queen’s University of Belfast, Stranmillis Road, Belfast, Northern Ireland BT9 5AG, U.K.
| | - Sergej Friesen
- Institut
für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Richard Buchner
- Institut
für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Marija Bešter-Rogač
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia
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34
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Paris AR, Bocarsly AB. High-Efficiency Conversion of CO2 to Oxalate in Water Is Possible Using a Cr-Ga Oxide Electrocatalyst. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04327] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aubrey R. Paris
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Andrew B. Bocarsly
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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35
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Furukawa K, Kuronuma S, Judai K. Water fluctuation in methanol, ethanol, and 1-propanol aqueous-mixture probed by Brownian motion. J Chem Phys 2018; 149:244505. [PMID: 30599750 DOI: 10.1063/1.5064750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The origin of the driving force in Brownian motion is the collision between the colloidal particle and the molecules of the surrounding fluid. Therefore, Brownian motion contains information on the local solvent structures of the surrounding colloid. The mean square displacement in a water-ethanol mixture is greater than that anticipated from the macroscopic shear viscosity, indicating that the microscopic movement of Brownian motion involves the local information on the water-ethanol mixture on a molecular level, i.e., an inhomogeneity in the Brownian particle size (∼1 μm). Here, the Brownian motion of mixtures of water and methanol, ethanol, and 1-propanol are systematically investigated. Similar discrepancies between the microscopic and macroscopic viscosities are observed at low alcohol molar concentrations, for all the alcohol mixtures. This means that inhomogeneity with water fluctuation is important in explanation of the unusual Brownian diffusions of alcohol aqueous solutions. The Brownian motion also reveals a thermal energy conversion mechanism between translation and rotation.
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Affiliation(s)
- Kazuki Furukawa
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
| | - Sumito Kuronuma
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
| | - Ken Judai
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
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36
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37
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Basařová P, Pišlová J, Mills J, Orvalho S. Influence of molecular structure of alcohol-water mixtures on bubble behaviour and bubble surface mobility. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2018.07.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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38
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Aguilera-Segura SM, Di Renzo F, Mineva T. Structures, intermolecular interactions, and chemical hardness of binary water-organic solvents: a molecular dynamics study. J Mol Model 2018; 24:292. [PMID: 30244346 DOI: 10.1007/s00894-018-3817-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 08/30/2018] [Indexed: 10/28/2022]
Abstract
The evolution of structural properties, thermodynamics and averaged (dynamic) total hardness values as a function of the composition of binary water-organic solvents, was rationalized in view of the intermolecular interactions. The organic solvents considered were ethanol, acetonitrile, and isopropanol at 0.25, 0.5, 0.75, and 1 mass fractions, and the results were obtained using molecular dynamics simulations. The site-to-site radial distribution functions reveal a well-defined peak for the first coordination shell in all solvents. A characteristic peak of the second coordination shell exists in aqueous mixtures of acetonitrile, whereas in the water-alcohol solvents, a second peak develops with the increase in alcohol content. From the computed coordination numbers, averaged hydrogen bonds and their lifetimes, we found that water mixed with acetonitrile largely preserves its structural features and promotes the acetonitrile structuring. Both the water and alcohol structures in their mixtures are disturbed and form hydrogen bonds between molecules of different kinds. The dynamic hardness values are obtained as the average over the total hardness values of 1200 snapshots per solvent type, extracted from the equilibrium dynamics. The dynamic hardness profile has a non-linear evolution with the liquid compositions, similarly to the thermodynamic properties of these non-ideal solvents. Graphical abstract Computed dynamic total hardness, as a function of the cosolvent mass fraction for water-ethanol (EtOH), water-isopropanol (2PrOH) and water-acetonitrile (AN).
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Affiliation(s)
- Sonia M Aguilera-Segura
- Matériaux Avancés pour la Catalyse et la Santé, UMR 5253 CNRS/UM/ENSCM, Institut Charles Gerhardt de Montpellier (ICGM), 240, Avenue du Professeur Emile Jeanbrau, 34296, Montpellier cedex 5, France
| | - Francesco Di Renzo
- Matériaux Avancés pour la Catalyse et la Santé, UMR 5253 CNRS/UM/ENSCM, Institut Charles Gerhardt de Montpellier (ICGM), 240, Avenue du Professeur Emile Jeanbrau, 34296, Montpellier cedex 5, France
| | - Tzonka Mineva
- Matériaux Avancés pour la Catalyse et la Santé, UMR 5253 CNRS/UM/ENSCM, Institut Charles Gerhardt de Montpellier (ICGM), 240, Avenue du Professeur Emile Jeanbrau, 34296, Montpellier cedex 5, France.
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39
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Muñoz-Muñoz YM, Guevara-Carrion G, Vrabec J. Molecular Insight into the Liquid Propan-2-ol + Water Mixture. J Phys Chem B 2018; 122:8718-8729. [DOI: 10.1021/acs.jpcb.8b05610] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Jadran Vrabec
- Thermodynamics and Energy Technology, University of Paderborn, 33098 Paderborn, Germany
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40
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Lenton S, Rhys NH, Towey JJ, Soper AK, Dougan L. Temperature-Dependent Segregation in Alcohol-Water Binary Mixtures Is Driven by Water Clustering. J Phys Chem B 2018; 122:7884-7894. [PMID: 30039970 DOI: 10.1021/acs.jpcb.8b03543] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Previous neutron scattering work, combined with computer simulated structure analysis, has established that binary mixtures of methanol and water partially segregate into water-rich and alcohol-rich components. It has furthermore been noted that, between methanol mole fractions of 0.27 and 0.54, both components, water and methanol, simultaneously form percolating clusters. This partial segregation is enhanced with decreasing temperature. The mole fraction of 0.27 also corresponds to the point of maximum excess entropy for ethanol-water mixtures. Here, we study the degree of molecular segregation in aqueous ethanol solutions at a mole fraction of 0.27 and compare it with that in methanol-water solutions at the same concentration. Structural information is extracted for these solutions using neutron diffraction coupled with empirical potential structure refinement. We show that ethanol, like methanol, bi-percolates at this concentration and that, in a similar manner to methanol, alcohol segregation, as measured by the proximity of neighboring methyl sidechains, is increased upon cooling the solution. Water clustering is found to be significantly enhanced in both alcohol solutions compared to the water clustering that occurs for random, hard sphere-like, mixing with no hydrogen bonds between molecules. Alcohol clustering via the hydrophobic groups is, on the other hand, only slightly sensitive to the water hydrogen bond network. These results support the idea that it is the water clustering that drives the partial segregation of the two components, and hence the observed excess entropy of mixing.
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Affiliation(s)
- Samuel Lenton
- School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , U.K
| | - Natasha H Rhys
- School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , U.K
| | - James J Towey
- School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , U.K
| | - Alan K Soper
- ISIS Facility , STFC Rutherford Appleton Laboratory , Harwell Campus , Didcot OX11 0QX , U.K
| | - Lorna Dougan
- School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , U.K
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41
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Pothoczki S, Pusztai L, Bakó I. Variations of the Hydrogen Bonding and Hydrogen-Bonded Network in Ethanol–Water Mixtures on Cooling. J Phys Chem B 2018; 122:6790-6800. [DOI: 10.1021/acs.jpcb.8b02493] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Szilvia Pothoczki
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, Konkoly Thege M. út 29-33., H-1121 Budapest, Hungary
| | - László Pusztai
- Wigner Research Centre for Physics, Hungarian Academy of Sciences, Konkoly Thege M. út 29-33., H-1121 Budapest, Hungary
- International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, 860-8555 Kumamoto, Japan
| | - Imre Bakó
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2., H-1117 Budapest, Hungary
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42
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Furukawa K, Judai K. Brownian motion probe for water-ethanol inhomogeneous mixtures. J Chem Phys 2017; 147:244502. [DOI: 10.1063/1.5007813] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Kazuki Furukawa
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
| | - Ken Judai
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
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43
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Smith JW, Saykally RJ. Soft X-ray Absorption Spectroscopy of Liquids and Solutions. Chem Rev 2017; 117:13909-13934. [DOI: 10.1021/acs.chemrev.7b00213] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jacob W. Smith
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, United States
| | - Richard J. Saykally
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, United States
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44
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Abstract
Whisky is distilled to around 70% alcohol by volume (vol-%) then diluted to about 40 vol-%, and often drunk after further slight dilution to enhance its taste. The taste of whisky is primarily associated with amphipathic molecules, such as guaiacol, but why and how dilution enhances the taste is not well understood. We carried out computer simulations of water-ethanol mixtures in the presence of guaiacol, providing atomistic details on the structure of the liquid mixture. We found that guaiacol is preferentially associated with ethanol, and, therefore, primarily found at the liquid-air interface in mixtures that contain up to 45 vol-% of ethanol. At ethanol concentrations of 59 vol-% or higher, guaiacol is increasingly surrounded by ethanol molecules and is driven to the bulk. This indicates that the taste of guaiacol in the whisky would be enhanced upon dilution prior to bottling. Our findings may apply to other flavour-giving amphipathic molecules and could contribute to optimising the production of spirits for desired tastes. Furthermore, it sheds light on the molecular structure of water-alcohol mixtures that contain small solutes, and reveals that interactions with the water may be negligible already at 89 vol-% of ethanol.
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45
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Anomalous propagation and scattering of sound in 2-propanol water solution near its singular point. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.040] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Sulaiman MI, Yang S, Ellis AM. Infrared Spectroscopy of Methanol and Methanol/Water Clusters in Helium Nanodroplets: The OH Stretching Region. J Phys Chem A 2017; 121:771-776. [DOI: 10.1021/acs.jpca.6b11170] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Media I. Sulaiman
- Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, U.K
| | - Shengfu Yang
- Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, U.K
| | - Andrew M. Ellis
- Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, U.K
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47
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Yamaguchi A, Muramatsu N, Mimura N, Shirai M, Sato O. Intramolecular dehydration of biomass-derived sugar alcohols in high-temperature water. Phys Chem Chem Phys 2017; 19:2714-2722. [DOI: 10.1039/c6cp06831f] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intramolecular dehydration of biomass-derived sugar alcohols d-sorbitol, d-mannitol, galactitol, xylitol, ribitol, l-arabitol, erythritol, l-threitol, and dl-threitol was investigated in high-temperature water at 523–573 K without the addition of any acid catalysts.
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Affiliation(s)
- Aritomo Yamaguchi
- Research Institute for Chemical Process Technology
- National Institute of Advanced Industrial Science and Technology (AIST)
- Sendai 983-8551
- Japan
- JST
| | - Natsumi Muramatsu
- Research Institute for Chemical Process Technology
- National Institute of Advanced Industrial Science and Technology (AIST)
- Sendai 983-8551
- Japan
| | - Naoki Mimura
- Research Institute for Chemical Process Technology
- National Institute of Advanced Industrial Science and Technology (AIST)
- Sendai 983-8551
- Japan
| | - Masayuki Shirai
- Research Institute for Chemical Process Technology
- National Institute of Advanced Industrial Science and Technology (AIST)
- Sendai 983-8551
- Japan
- Department of Chemistry and Biological Sciences
| | - Osamu Sato
- Research Institute for Chemical Process Technology
- National Institute of Advanced Industrial Science and Technology (AIST)
- Sendai 983-8551
- Japan
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