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Reuhl M, Monnard P, Vogel M. Confinement effects on glass-forming mixtures: Insights from a combined experimental approach to aqueous ethylene glycol solutions in silica pores. J Chem Phys 2022; 156:084506. [DOI: 10.1063/5.0082406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We perform nuclear magnetic resonance, broadband dielectric spectroscopy, and differential scanning calorimetry studies to ascertain the dynamical behaviors of aqueous ethylene glycol (EG) solutions in silica pores over broad temperature ranges. Both translational and rotational motions are analyzed, and the pore diameter (2.4–9.2 nm) and the EG concentration (12–57 mol. %) are varied, leading to fully liquid or partially crystalline systems. It is found that the translational diffusion coefficient strongly decreases when the diameter is reduced, resulting in a slowdown of nearly three orders of magnitude in the narrowest pores, while the confinement effects on the rotational correlation times are moderate. For the fully liquid solutions, we attribute bulk-like and slowed down reorientation processes to the central and interfacial pore regions, respectively. This coexistence is found in all the studied pores, and, hence, the range of the wall effects on the solution dynamics does not exceed ∼1 nm. Compared to the situation in the bulk, the concentration dependence is reduced in confinements, implying that the specific interactions of the molecular species with the silica walls lead to preferential adsorption. On the other hand, bulk-like structural relaxation is not observed in the partially frozen samples, where the liquid is sandwiched between the silica walls and the ice crystallites. Under such circumstances, there is another relaxation process with a weaker temperature dependence, which is observed in various kinds of partially frozen aqueous systems and denoted as the x process.
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Affiliation(s)
- Melanie Reuhl
- Institute of Condensed Matter Physics, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany
| | - Philipp Monnard
- Institute of Condensed Matter Physics, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany
| | - Michael Vogel
- Institute of Condensed Matter Physics, Technische Universität Darmstadt, Hochschulstr. 6, 64289 Darmstadt, Germany
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Musumeci V, Goracci G, Sanz Camacho P, Dolado JS, Aymonier C. Correlation between the Dynamics of Nanoconfined Water and the Local Chemical Environment in Calcium Silicate Hydrate Nanominerals. Chemistry 2021; 27:11309-11318. [PMID: 33999438 DOI: 10.1002/chem.202100098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Indexed: 11/07/2022]
Abstract
Calcium silicate hydrates are members of a large family of minerals with layered structures containing pendant CaOH and SiOH groups that interact with confined water molecules. To rationalize the impact of the local chemical environment on the dynamics of water, SiOH- and CaOH-rich model nanocrystals were synthesized by using the continuous supercritical hydrothermal method and then systematically studied by a combination of spectroscopic techniques. In our comprehensive analysis, the ultrafast relaxation dynamics of hanging hydroxy groups can be univocally assigned to CaOH or SiOH environments, and the local chemical environment largely affects the H-bond network of the solvation water. Interestingly, the ordered "ice-like" solvation water found in the SiOH-rich environments is converted to a disordered "liquid-like" distribution in the CaOH-rich environment. This refined picture of the dynamics of confined water and hydroxy groups in calcium silicate hydrates can also be applied to other water-containing materials, with a significant impact in many fields of materials science.
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Affiliation(s)
- Valentina Musumeci
- CNRS, Université de Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France.,Centro de Física de Materiales (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain
| | - Guido Goracci
- Centro de Física de Materiales (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain.,BASKRETE-Euskampus Fundazioa, Ed. Rectorado Barrio Sarriena s/n, 48940, Leioa, Spain
| | - Paula Sanz Camacho
- CNRS, Université de Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
| | - Jorge S Dolado
- Centro de Física de Materiales (CSIC-UPV/EHU)-Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018, San Sebastián, Spain.,Donostia International Physics Center (DIPC), Paseo Manuel Lardizábal 4, 20018, Donostia-San Sebastián, Spain
| | - Cyril Aymonier
- CNRS, Université de Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 33600, Pessac, France
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Demuth D, Reuhl M, Hopfenmüller M, Karabas N, Schoner S, Vogel M. Confinement Effects on Glass-Forming Aqueous Dimethyl Sulfoxide Solutions. Molecules 2020; 25:E4127. [PMID: 32917011 PMCID: PMC7570821 DOI: 10.3390/molecules25184127] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/04/2020] [Accepted: 09/05/2020] [Indexed: 11/17/2022] Open
Abstract
Combining broadband dielectric spectroscopy and nuclear magnetic resonance studies, we analyze the reorientation dynamics and the translational diffusion associated with the glassy slowdown of the eutectic aqueous dimethyl sulfoxide solution in nano-sized confinements, explicitly, in silica pores with different diameters and in ficoll and lysozyme matrices at different concentrations. We observe that both rotational and diffusive dynamics are slower and more heterogeneous in the confinements than in the bulk but the degree of these effects depends on the properties of the confinement and differs for the components of the solution. For the hard and the soft matrices, the slowdown and the heterogeneity become more prominent when the size of the confinement is reduced. In addition, the dynamics are more retarded for dimethyl sulfoxide than for water, implying specific guest-host interactions. Moreover, we find that the temperature dependence of the reorientation dynamics and of the translational diffusion differs in severe confinements, indicating a breakdown of the Stokes-Einstein-Debye relation. It is discussed to what extent these confinement effects can be rationalized in the framework of core-shell models, which assume bulk-like and slowed-down motions in central and interfacial confinement regions, respectively.
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Affiliation(s)
| | | | | | | | | | - Michael Vogel
- Institute of Condensed Matter Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany; (D.D.); (M.R.); (M.H.); (N.K.); (S.S.)
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Mhanna R, Catrou P, Dutta S, Lefort R, Essafri I, Ghoufi A, Muthmann M, Zamponi M, Frick B, Morineau D. Dynamic Heterogeneities in Liquid Mixtures Confined in Nanopores. J Phys Chem B 2020; 124:3152-3162. [DOI: 10.1021/acs.jpcb.0c01035] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ramona Mhanna
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
- Institut Laue-Langevin, 71 avenue des Martyrs, F-38000 Grenoble, France
| | - Pierre Catrou
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
| | - Sujeet Dutta
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
| | - Ronan Lefort
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
| | - Ilham Essafri
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
| | - Aziz Ghoufi
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
| | - Matthias Muthmann
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Michaela Zamponi
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Bernhard Frick
- Institut Laue-Langevin, 71 avenue des Martyrs, F-38000 Grenoble, France
| | - Denis Morineau
- Institute of Physics of Rennes, CNRS−University of Rennes 1, UMR 6251, F-35042 Rennes, France
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Dutta S, Srikantamurthy S, Mukherjee PK, Krishna Prasad S. Nanometer Confinement-Driven Promotion and Stabilization of a Hexatic Phase Intervening between Ordered Rotator Phases. J Phys Chem B 2018; 122:10953-10963. [PMID: 30422650 DOI: 10.1021/acs.jpcb.8b09017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bulk phase binary mixture of two rotator phase forming alkanes, n-tricosane (C23H48) and n-octacosane (C28H58), has been previously studied. C23H48 exists in the RII and RI phases, whereas C28H58 exists in the RIII and RIV phases. Over a certain range of composition, this binary mixture was found to exist in RII, RI and an intervening mesophase was reported to be the hexatic phase, wherein the long-range two-dimensional in-plane hexagonal lattice order of the RII is lost and what remains is molecules present in hexagonal geometry without long-range positional correlation between individual hexagons. Upon confinement in cylindrical anodized alumina pores 200 nm wide, on the one hand, the temperature range of the hexatic phase was found to extend, and on the other hand, it underwent increased molecular ordering compared to the hexatic phase in bulk, exhibiting two counter-reacting behaviors in confinement. We provide here a temperature-dependent X-ray diffraction study and a theoretical approach combining the Landau and Flory-Huggins theories to, first, understand the underlying mechanism leading to emergence of the hexatic phase and then to explain the effect of confinement on it in the light of finite size and interfacial interaction between the alkanes and alumina pores.
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Affiliation(s)
- Sujeet Dutta
- Centre for Nano and Soft Matter Sciences , Bengaluru 560013 , India
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Dutta S, Prasad SK. Confinement-driven radical change in a sequence of rotator phases: a study on n-octacosane. Phys Chem Chem Phys 2018; 20:24345-24352. [PMID: 30215085 DOI: 10.1039/c8cp03603a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rotator-phase forming n-alkanes have been studied extensively in both their bulk state and in nanoconfinement. While some alkanes maintain their bulk-state rotator phases in nanoconfinement albeit with increased disorder, there are others exhibiting new rotator phases upon confinement. We present here a temperature dependent X-ray diffraction (XRD) and differential scanning calorimetric (DSC) study on n-octacosane (C28H58), which almost completely loses its bulk state RIV phase and undergoes complete disappearance of its RIII phase. In their place, when confined in cylindrical anodized alumina nanopores, a phase highly resembling the hexatic mesophase is formed at a higher temperature and the RI rotator phase at a lower temperature. The effects of finite size, interfacial interactions with the host matrix and alkyl chain flexibility are used to provide an explanation for such unexpected behaviour.
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Affiliation(s)
- Sujeet Dutta
- Centre for Nano and Soft Matter Sciences, Bengaluru, Karnataka, India.
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Abstract
Abstract
Effects of interfaces on hydrogen-bonded liquids play major roles in nature and technology. Despite their importance, a fundamental understanding of these effects is still lacking. In large parts, this shortcoming is due to the high complexity of these systems, leading to an interference of various interactions and effects. Therefore, it is advisable to take gradual approaches, which start from well designed and defined model systems and systematically increase the level of intricacy towards more complex mimetics. Moreover, it is necessary to combine insights from a multitude of methods, in particular, to link novel preparation strategies and comprehensive experimental characterization with inventive computational and theoretical modeling. Such concerted approach was taken by a group of preparative, experimentally, and theoretically working scientists in the framework of Research Unit FOR 1583 funded by the Deutsche Forschungsgemeinschaft (German Research Foundation). This special issue summarizes the outcome of this collaborative research. In this introductory article, we give an overview of the covered topics and the main results of the whole consortium. The following contributions are review articles or original works of individual research projects.
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Affiliation(s)
- Gerd Buntkowsky
- Institut für Physikalische Chemie , Technische Universität Darmstadt , 64287 Darmstadt , Germany
| | - Michael Vogel
- Institut für Festkörperphysik , Technische Universität Darmstadt , 64295 Darmstadt , Germany
| | - Roland Winter
- Fakultät für Chemie und Chemische Biologie , Technische Universität Dortmund , 44227 Dortmund , Germany
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Mhanna R, Abdel Hamid AR, Dutta S, Lefort R, Noirez L, Frick B, Morineau D. More room for microphase separation: An extended study on binary liquids confined in SBA-15 cylindrical pores. J Chem Phys 2017; 146:024501. [DOI: 10.1063/1.4972126] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Geske J, Vogel M. Creating realistic silica nanopores for molecular dynamics simulations. MOLECULAR SIMULATION 2016. [DOI: 10.1080/08927022.2016.1221072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Julian Geske
- Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany
| | - Michael Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, Darmstadt, Germany
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Dutta S, Lefort R, Morineau D, Mhanna R, Merdrignac-Conanec O, Saint-Jalmes A, Leclercq T. Thermodynamics of binary gas adsorption in nanopores. Phys Chem Chem Phys 2016; 18:24361-9. [PMID: 27532892 DOI: 10.1039/c6cp01587e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
MCM-41 nanoporous silicas show a very high selectivity for monoalcohols over aprotic molecules during adsorption of a binary mixture in the gas phase. We present here an original use of gravimetric vapour sorption isotherms to characterize the role played by the alcohol hydrogen-bonding network in the adsorption process. Beyond simple selectivity, vapour sorption isotherms measured for various compositions help to completely unravel at the molecular level the step by step adsorption mechanism of the binary system in the nanoporous solid, from the first monolayers to the complete liquid condensation.
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Affiliation(s)
- Sujeet Dutta
- Institut de Physique de Rennes, University of Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes, France.
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Schmitz R, Müller N, Ullmann S, Vogel M. A molecular dynamics simulations study on ethylene glycol-water mixtures in mesoporous silica. J Chem Phys 2016; 145:104703. [DOI: 10.1063/1.4962240] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Rebecca Schmitz
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Niels Müller
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Svenja Ullmann
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Michael Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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