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Gorman BR, McNeil LE. Effect of polymerization on free water in polyacrylamide hydrogels observed with Brillouin spectroscopy. SOFT MATTER 2024; 20:5164-5173. [PMID: 38895797 DOI: 10.1039/d4sm00250d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Brillouin spectroscopy is used to determine the effects of polymer concentration, crosslinking density, and polymerization on the longitudinal storage and loss moduli of polyacrylamide hydrogels. The model established by Chiarelli et al. is implemented to calculate the speed of sound in the free water [Chiarelli et al., The Journal of the Acoustical Society of America, 2010, 127(3), 1197-1207]. The polymer concentration has the greatest effect on the moduli of the polymer matrix. We determined that the crosslink density has no measurable effect on the logitudinal storage or loss modulus of polyacrylamide hydrogels when measurements are made at GHz frequencies, in contrast to measurements made at kHz frequencies as documented by other studies. However, the moduli are independent of monomer concentration if the acrylamide is not polymerized. We show at the GHz frequency that the incorporation of acrylamide polymer chains affects the mechanical properties of the free water. The speed of sound in the free water is reduced by the introduction of polymerized acrylamide. The long polymer chains and their interactions with the bounded water disrupt the bonding organization of the unbound water, causing a reduction of the average hydrogen bond strength between free water molecules. This results in a decreased speed of sound in the free water and an increase in the longitudinal storage modulus of the hydrogel.
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Affiliation(s)
- Britta R Gorman
- Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
| | - L E McNeil
- Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
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Fardis M, Karagianni M, Gkoura L, Papavassiliou G. Self-Diffusion in Confined Water: A Comparison between the Dynamics of Supercooled Water in Hydrophobic Carbon Nanotubes and Hydrophilic Porous Silica. Int J Mol Sci 2022; 23:ijms232214432. [PMID: 36430907 PMCID: PMC9697084 DOI: 10.3390/ijms232214432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/15/2022] [Accepted: 11/17/2022] [Indexed: 11/22/2022] Open
Abstract
Confined liquids are model systems for the study of the metastable supercooled state, especially for bulk water, in which the onset of crystallization below 230 K hinders the application of experimental techniques. Nevertheless, in addition to suppressing crystallization, confinement at the nanoscale drastically alters the properties of water. Evidently, the behavior of confined water depends critically on the nature of the confining environment and the interactions of confined water molecules with the confining matrix. A comparative study of the dynamics of water under hydrophobic and hydrophilic confinement could therefore help to clarify the underlying interactions. As we demonstrate in this work using a few representative results from the relevant literature, the accurate assessment of the translational mobility of water molecules, especially in the supercooled state, can unmistakably distinguish between the hydrophilic and hydrophobic nature of the confining environments. Among the numerous experimental methods currently available, we selected nuclear magnetic resonance (NMR) in a field gradient, which directly measures the macroscopic translational self-diffusion coefficient, and quasi-elastic neutron scattering (QENS), which can determine the microscopic translational dynamics of the water molecules. Dielectric relaxation, which probes the re-orientational degrees of freedom, are also discussed.
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A Physical–Mathematical Approach to Climate Change Effects through Stochastic Resonance. CLIMATE 2019. [DOI: 10.3390/cli7020021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The aim of this work is to study the effects induced by climate changes in the framework of the stochastic resonance approach. First, a wavelet cross-correlation analysis on Earth temperature data concerning the last 5,500,000 years is performed; this analysis confirms a correlation between the planet’s temperature and the 100,000, 41,000, and 23,000-year periods of the Milankovitch orbital cycles. Then, the stochastic resonance model is invoked. Specific attention is given to the study of the impact of the registered global temperature increase within the stochastic model. Further, a numerical simulation has been performed, based on: (1) A double-well potential, (2) an external periodic modulation, corresponding to the orbit eccentricity cycle, and (3) an increased value of the global Earth temperature. The effect of temperature increase represents one of the novelties introduced in the present study and is determined by downshifting the interaction potential used within the stochastic resonance model. The numeric simulation results show that, for simulated increasing values of the global temperature, the double-well system triggers changes, while at higher temperatures (as in the case of the absence of a global temperature increase although with a different threshold) the system goes into a chaotic regime. The wavelet analysis allows characterization of the stochastic resonance condition through the evaluation of the signal-to-noise ratio. On the basis of the obtained findings, we hypothesize that the global temperature increase can suppress, on a large time scale corresponding to glacial cycles, the external periodic modulation effects and, hence, the glacial cycles.
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Bulavin L, Malomuzh N, Shakun K. MD-modeling of the intermediate scattering function for argon-like liquids and water. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Atamas N, Bardik V, Bannikova A, Grishina O, Lugovskoi E, Lavoryk S, Makogonenko Y, Korolovych V, Nerukh D, Paschenko V. The effect of water dynamics on conformation changes of albumin in pre-denaturation state: photon correlation spectroscopy and simulation. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Spiegel DR, Kollie PC, Van Tilburg SJ. Experimental tests of free-volume tracer diffusion in water and other solvents. J Chem Phys 2014; 140:104507. [PMID: 24628182 DOI: 10.1063/1.4867911] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Using forced Rayleigh scattering, the tracer diffusion of methyl red through water and eight other solvents at different temperatures is investigated and the results are compared to the Cohen-Turnbull theory of free-volume diffusion. In seven solvents the effective non-Arrhenius activation energy measured experimentally agrees with the Cohen-Turnbull energy. In water, however, the diffusion can be described mathematically by the free volume model but there is a disagreement of more than an order of magnitude between these energies. We propose that the unique "zero point" free volume forced onto water by the strong hydrogen bonding requires a different mechanism for tracer motion.
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Affiliation(s)
- Daniel R Spiegel
- Department of Physics and Astronomy, Trinity University, San Antonio, Texas 78212-7200, USA
| | - Paulses C Kollie
- Department of Physics and Astronomy, Trinity University, San Antonio, Texas 78212-7200, USA
| | - Scott J Van Tilburg
- Department of Physics and Astronomy, Trinity University, San Antonio, Texas 78212-7200, USA
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Bardik V, Gotsulskii V, Pavlov E, Malomuzh N, Nerukh D, Yanchuk I, Lavoryk S. Light scattering study of human serum albumin in pre-denaturation: Relation to dynamic transition in water at 42°C. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.09.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Qvist J, Mattea C, Sunde EP, Halle B. Rotational dynamics in supercooled water from nuclear spin relaxation and molecular simulations. J Chem Phys 2012; 136:204505. [DOI: 10.1063/1.4720941] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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Fisenko AI, Malomuzh NP. To What Extent Is Water Responsible for the Maintenance of the Life for Warm-Blooded Organisms? Int J Mol Sci 2009; 10:2383-2411. [PMID: 19564955 PMCID: PMC2695283 DOI: 10.3390/ijms10052383] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2009] [Revised: 05/04/2009] [Accepted: 05/13/2009] [Indexed: 11/16/2022] Open
Affiliation(s)
- Anatoliy I. Fisenko
- Oncfec, Inc., 625 Evans Avenue, Suite 1108, Toronto, Ontario, M8W 2W5, Canada
- Author to whom correspondence should be addressed; E-Mail:
; Tel. +1-416-503-9335
| | - Nikolay P. Malomuzh
- Department of Theoretical Physics, Odessa National University, 2 Dvoryaskaja Street, Odessa, 65026, Ukraine; E-Mail:
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Bulavin LA, Lokotosh TV, Malomuzh NP. Role of the collective self-diffusion in water and other liquids. J Mol Liq 2008. [DOI: 10.1016/j.molliq.2007.05.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fisenko A, Malomuzh N, Oleynik A. To what extent are thermodynamic properties of water argon-like? Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2007.11.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Malomuzh NP, Slinchak EL. The cluster structure of dilute aqueous-alcoholic solutions and molecular light scattering in them. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2007. [DOI: 10.1134/s0036024407110106] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Character of the thermal motion of water molecules according to the data on quasielastic incoherent scattering of slow neutrons. J STRUCT CHEM+ 2006. [DOI: 10.1007/s10947-006-0264-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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The nature of anomalous behavior of the Landau–Placzek ratio for supercooled water. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2004.03.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Khoshtariya DE, Zahl A, Dolidze TD, Neubrand A, van Eldik R. Discrimination of Diverse (Pressure/Temperature-Dependent/Independent) Inherent Sub-structures in Liquid Water (D2O) from Difference Vibrational Spectroscopy. J Phys Chem B 2004. [DOI: 10.1021/jp047333t] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dimitri E. Khoshtariya
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstrasse 1, 91058 Erlangen, Germany, and Institute of Molecular Biology and Biophysics, Georgian Academy of Sciences, Gotua 12, Tbilisi 0160, Georgian Republic
| | - Achim Zahl
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstrasse 1, 91058 Erlangen, Germany, and Institute of Molecular Biology and Biophysics, Georgian Academy of Sciences, Gotua 12, Tbilisi 0160, Georgian Republic
| | - Tina D. Dolidze
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstrasse 1, 91058 Erlangen, Germany, and Institute of Molecular Biology and Biophysics, Georgian Academy of Sciences, Gotua 12, Tbilisi 0160, Georgian Republic
| | - Anton Neubrand
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstrasse 1, 91058 Erlangen, Germany, and Institute of Molecular Biology and Biophysics, Georgian Academy of Sciences, Gotua 12, Tbilisi 0160, Georgian Republic
| | - Rudi van Eldik
- Institute for Inorganic Chemistry, University of Erlangen-Nürnberg Egerlandstrasse 1, 91058 Erlangen, Germany, and Institute of Molecular Biology and Biophysics, Georgian Academy of Sciences, Gotua 12, Tbilisi 0160, Georgian Republic
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Bartell LS, Chushak YG. Nucleation of Ice in Large Water Clusters: Experiment and Simulation. WATER IN CONFINING GEOMETRIES 2003. [DOI: 10.1007/978-3-662-05231-0_17] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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GUO GUANGJUN, ZHANG YIGANG, REFSON KEITH, ZHAO YAJUAN. Viscosity and stress autocorrelation function in supercooled water: a molecular dynamics study. Mol Phys 2002. [DOI: 10.1080/00268970210133477] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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