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Röwekamp L, Moch K, Gainaru C, Böhmer R. Predicting Dielectric and Shear-Rheology Properties of Glass-Forming Pharmaceutical Liquids from Each Other: Applications and Limitations. Mol Pharm 2022; 19:1586-1597. [PMID: 35405077 DOI: 10.1021/acs.molpharmaceut.2c00077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Acetaminophen, nicotine, and lidocaine hydrochloride were investigated in their deeply supercooled liquid states using oscillatory shear rheology. The mechanical spectra of these drugs are presented in modulus, compliance, as well as fluidity formats. Their frequency profiles can be described via models adapted from the field of charge transport. Inspired by the success of this approach, the Barton-Nakajima-Namikawa relation, best known from the same field, was also tested. When adapted to rheology, this approach interrelates static and dynamic characteristics of viscous flow and was found to work excellently. The temperature dependence of the characteristic shear frequencies was checked against the shoving model, which relates them to the temperature-dependent instantaneous shear modulus and acceptable agreement was found. Combined with shear mechanical literature data on ibuprofen and indomethacin, a modified version of the phenomenological model by Gemant, DiMarzio, and Bishop (GDB) was employed to successfully predict the shape and amplitude of the dielectric spectra for all studied liquids, except for lidocaine hydrochloride. For the latter, the modified GDB model is suggested to aid in mapping out the reorientational part of the dielectric response, while the experimental results are strongly superimposed by ionic conduction phenomena. The reverse transformation, the calculation of rheological spectra based on dielectric ones, is also successfully demonstrated. For the example of acetyl salicylic acid, it is shown how dielectric spectra can be used to even predict rheological ones. The limits of the central parameter governing these mutual transformations, the electroviscoelastic material constant, and indications for its correlation with the dielectric relaxation strength are discussed. For pharmaceuticals characterized by a strong dynamical decoupling of the electrical from the mechanical degrees of freedom, the modified GDB model is not expected to be applicable.
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Affiliation(s)
- Lara Röwekamp
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Kevin Moch
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Catalin Gainaru
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany.,Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Roland Böhmer
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
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2
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Weeber R, Kreissl P, Holm C. Magnetic field controlled behavior of magnetic gels studied using particle-based simulations. PHYSICAL SCIENCES REVIEWS 2021. [DOI: 10.1515/psr-2019-0106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Abstract
This contribution provides an overview of the study of soft magnetic materials using particle-based simulation models. We focus in particular on systems where thermal fluctuations are important. As a basis for further discussion, we first describe two-dimensional models which demonstrate two deformation mechanisms of magnetic gels in a homogeneous field. One is based on the change of magnetic interactions between magnetic particles as a response to an external field; the other is the result of magnetically blocked particles acting as cross-linkers. Based on the qualitative behavior directly observable in the two-dimensional models, we extend our description to three-dimensions. We begin with particle-cross-linked gels, as for those, our three-dimensional model also includes explicitly resolved polymer chains. Here, the polymer chains are represented by entropic springs, and the deformation of the gel is the result of the interaction between magnetic particles. We use this model to examine the influence of the magnetic spatial configuration of magnetic particles (uniaxial or isotropic) on the gel’s magnetomechanical behavior. A further part of the article will be dedicated to scale-bridging approaches such as systematic coarse-graining and models located at the boundary between particle-based and continuum modeling. We will conclude our article with a discussion of recent results for modeling time-dependent phenomena in magnetic-polymer composites. The discussion will be focused on a simulation model suitable for obtaining AC-susceptibility spectra for dilute ferrofluids including hydrodynamic interactions. This model will be the basis for studying the signature of particle–polymer coupling in magnetic hybrid materials. In the long run, we aim to compare material properties probed locally via the AC-susceptibility spectra to elastic moduli obtained for the system at a global level.
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Affiliation(s)
- Rudolf Weeber
- Institute for Computational Physics, University of Stuttgart , Stuttgart , Germany
| | - Patrick Kreissl
- Institute for Computational Physics, University of Stuttgart , Stuttgart , Germany
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart , Stuttgart , Germany
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3
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Kreissl P, Holm C, Weeber R. Frequency-dependent magnetic susceptibility of magnetic nanoparticles in a polymer solution: a simulation study. SOFT MATTER 2021; 17:174-183. [PMID: 33165470 DOI: 10.1039/d0sm01554g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magnetic composite materials i.e. elastomers, polymer gels, or polymer solutions with embedded magnetic nanoparticles are useful for many technical and bio-medical applications. However, the microscopic details of the coupling mechanisms between the magnetic properties of the particles and the mechanical properties of the (visco)elastic polymer matrix remain unresolved. Here we study the response of a single-domain spherical magnetic nanoparticle that is suspended in a polymer solution to alternating magnetic fields. As interactions we consider only excluded volume interactions with the polymers and hydrodynamic interactions mediated through the solvent. The AC susceptibility spectra are calculated using a linear response Green-Kubo approach, and the influences of changing polymer concentration and polymer length are investigated. Our data is compared to recent measurements of the AC susceptibility for a typical magnetic composite system [Roeben et al., Colloid Polym. Sci., 2014, 2013-2023], and demonstrates the importance of hydrodynamic coupling in such systems.
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Affiliation(s)
- Patrick Kreissl
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
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4
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Buchenau U. Eshelby description of highly viscous flow—Half model, half theory. J Chem Phys 2018; 149:044508. [DOI: 10.1063/1.5042361] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- U. Buchenau
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
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5
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Abstract
The highly viscous flow is due to thermally activated Eshelby transitions which transform a region of the undercooled liquid to a different structure with a different elastic misfit to the viscoelastic surroundings. A self-consistent determination of the viscosity in this picture explains why the average structural relaxation time is a factor of eight longer than the Maxwell time. The physical reason for the short Maxwell time is the very large contribution of strongly strained inherent states to the fluidity (the inverse viscosity). At the Maxwell time, the viscous no-return processes coexist with the back-and-forth jumping retardation processes.
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Affiliation(s)
- U Buchenau
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), 52425 Jülich, Germany
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6
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Jensen MH, Gainaru C, Alba-Simionesco C, Hecksher T, Niss K. Slow rheological mode in glycerol and glycerol–water mixtures. Phys Chem Chem Phys 2018; 20:1716-1723. [DOI: 10.1039/c7cp06482a] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Glycerol–water mixtures were studied at molar concentrations ranging from xgly = 1 (neat glycerol) to xgly = 0.3 using shear mechanical spectroscopy.
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Affiliation(s)
- M. H. Jensen
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
- Laboratoire Léon Brillouin, CNRS CEA-UMR 12, CEA Saclay
- 91191 Gif-sur-Yvette Cedex
| | - C. Gainaru
- Fakultät Physik, Technische Universität Dortmund
- 44221 Dortmund
- Germany
| | - C. Alba-Simionesco
- Laboratoire Léon Brillouin, CNRS CEA-UMR 12, CEA Saclay
- 91191 Gif-sur-Yvette Cedex
- France
| | - T. Hecksher
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
| | - K. Niss
- Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University
- DK-4000 Roskilde
- Denmark
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7
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Buchenau U. Pragmatical access to the viscous flow of undercooled liquids. Phys Rev E 2017; 95:062603. [PMID: 28709203 DOI: 10.1103/physreve.95.062603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Indexed: 11/07/2022]
Abstract
The paper derives a relation for the viscosity of undercooled liquids on the basis of the pragmatical model concept of Eshelby relaxations with a finite lifetime. From accurate shear relaxation data in the literature, one finds that slightly less than half of the internal stresses relax directly via single Eshelby relaxations; the larger part dissolves at the terminal lifetime, which is a combined effect of many Eshelby relaxations.
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Affiliation(s)
- U Buchenau
- Jülich Center for Neutron Science, Forschungszentrum Jülich Postfach 1913, D-52425 Jülich, Federal Republic of Germany
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8
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Hecksher T, Olsen NB, Dyre JC. Model for the alpha and beta shear-mechanical properties of supercooled liquids and its comparison to squalane data. J Chem Phys 2017; 146:154504. [PMID: 28433033 DOI: 10.1063/1.4979658] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This paper presents data for supercooled squalane's frequency-dependent shear modulus covering frequencies from 10 mHz to 30 kHz and temperatures from 168 K to 190 K; measurements are also reported for the glass phase down to 146 K. The data reveal a strong mechanical beta process. A model is proposed for the shear response of the metastable equilibrium liquid phase of supercooled liquids. The model is an electrical equivalent-circuit characterized by additivity of the dynamic shear compliances of the alpha and beta processes. The nontrivial parts of the alpha and beta processes are each represented by a "Cole-Cole retardation element" defined as a series connection of a capacitor and a constant-phase element, resulting in the Cole-Cole compliance function well-known from dielectrics. The model, which assumes that the high-frequency decay of the alpha shear compliance loss varies with the angular frequency as ω-1/2, has seven parameters. Assuming time-temperature superposition for the alpha and beta processes separately, the number of parameters varying with temperature is reduced to four. The model provides a better fit to the data than an equally parametrized Havriliak-Negami type model. From the temperature dependence of the best-fit model parameters, the following conclusions are drawn: (1) the alpha relaxation time conforms to the shoving model; (2) the beta relaxation loss-peak frequency is almost temperature independent; (3) the alpha compliance magnitude, which in the model equals the inverse of the instantaneous shear modulus, is only weakly temperature dependent; (4) the beta compliance magnitude decreases by a factor of three upon cooling in the temperature range studied. The final part of the paper briefly presents measurements of the dynamic adiabatic bulk modulus covering frequencies from 10 mHz to 10 kHz in the temperature range from 172 K to 200 K. The data are qualitatively similar to the shear modulus data by having a significant beta process. A single-order-parameter framework is suggested to rationalize these similarities.
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Affiliation(s)
- Tina Hecksher
- "Glass and Time," IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Niels Boye Olsen
- "Glass and Time," IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Jeppe C Dyre
- "Glass and Time," IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
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9
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Abstract
The crossover from back-and-forth jumps between structural minima to the no-return jumps of the viscous flow is modeled in terms of an ensemble of double-well potentials with a finite decay probability. The ensemble is characterized by the Kohlrausch-exponent β of the time dependence t(β) of the response at short times. The model is applied to shear and dielectric data from the literature.
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Affiliation(s)
- U Buchenau
- Jülich Center for Neutron Science, Forschungszentrum Jülich, Postfach 1913, D-52425 Jülich, Federal Republic of Germany
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10
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Roed LA, Niss K, Jakobsen B. Communication: High pressure specific heat spectroscopy reveals simple relaxation behavior of glass forming molecular liquid. J Chem Phys 2015; 143:221101. [PMID: 26671349 DOI: 10.1063/1.4936867] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The frequency dependent specific heat has been measured under pressure for the molecular glass forming liquid 5-polyphenyl-4-ether in the viscous regime close to the glass transition. The temperature and pressure dependences of the characteristic time scale associated with the specific heat is compared to the equivalent time scale from dielectric spectroscopy performed under identical conditions. It is shown that the ratio between the two time scales is independent of both temperature and pressure. This observation is non-trivial and demonstrates the existence of specially simple molecular liquids in which different physical relaxation processes are both as function of temperature and pressure/density governed by the same underlying "inner clock." Furthermore, the results are discussed in terms of the recent conjecture that van der Waals liquids, like the measured liquid, comply to the isomorph theory.
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Affiliation(s)
- Lisa Anita Roed
- DNRF Centre "Glass and Time," IMFUFA, Department of Sciences, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Kristine Niss
- DNRF Centre "Glass and Time," IMFUFA, Department of Sciences, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Bo Jakobsen
- DNRF Centre "Glass and Time," IMFUFA, Department of Sciences, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
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11
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Garcia-Bernabé A, Lidón-Roger JV, Sanchis MJ, Díaz-Calleja R, del Castillo LF. Interconversion algorithm between mechanical and dielectric relaxation measurements for acetate of cis- and trans-2-phenyl-5-hydroxymethyl-1,3-dioxane. Phys Rev E 2015; 92:042307. [PMID: 26565240 DOI: 10.1103/physreve.92.042307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Indexed: 11/07/2022]
Abstract
The dielectric and mechanical spectroscopies of acetate of cis- and trans-2-phenyl-5-hydroxymethyl-1,3-dioxane are reported in the frequency domain from 10(-2) to 10(6)Hz. This ester has been selected in this study for its predominant α relaxation with regard to the β relaxation, which can be neglected. This study consists of determining an interconversion algorithm between dielectric and mechanical measurements, given by using a relation between rotational and translational complex viscosities. These important viscosities were obtained from measures of the dielectric complex permittivity and by dynamic mechanical analysis, respectively. The definitions of rotational and translational viscosities were evaluated by means of fractional calculus, by using the fit parameters of the Havriliak-Negami empirical model obtained in the dielectric and mechanical characterization of the α relaxation. This interconversion algorithm is a generalization of the break of the Stokes-Einstein-Debye relationship. It uses a power law with an exponent defined as the shape factor, which modifies the translational viscosity. Two others factors are introduced for the interconversion, a shift factor, which displaces the translational viscosity in the frequency domain, and a scale factor, which makes equal values of the two viscosities. In this paper, the shape factor has been identified as the relation between the slopes of the moduli of the complex viscosities at higher frequency. This is interpreted as the degree of kinetic coupling between the molecular rotation and translational movements. Alternatively, another interconversion algorithm has been expressed by means of dielectric and mechanical moduli.
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Affiliation(s)
- A Garcia-Bernabé
- Departamento de Termodinámica Aplicada, Universitat Politècnica de València, 46022-Valencia, Spain
| | - J V Lidón-Roger
- Departamento de Ingeniería Electrónica, Universitat Politècnica de València, 46022-Valencia, Spain.,Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Universitat Politècnica de València, 46022-Valencia, Spain
| | - M J Sanchis
- Departamento de Termodinámica Aplicada, Universitat Politècnica de València, 46022-Valencia, Spain.,Instituto de Tecnología Eléctrica, Avenida Juan de la Cierva 24, 46980 Paterna-Valencia, Spain
| | - R Díaz-Calleja
- Instituto de Tecnología Eléctrica, Avenida Juan de la Cierva 24, 46980 Paterna-Valencia, Spain
| | - L F del Castillo
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ap. Postal 70-360, Coyoacán, México Distrito Federal 04510, Mexico
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12
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Richert R. Supercooled Liquids and Glasses by Dielectric Relaxation Spectroscopy. ADVANCES IN CHEMICAL PHYSICS 2014. [DOI: 10.1002/9781118949702.ch4] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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13
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Hecksher T, Jakobsen B. Communication: Supramolecular structures in monohydroxy alcohols: Insights from shear-mechanical studies of a systematic series of octanol structural isomers. J Chem Phys 2014; 141:101104. [DOI: 10.1063/1.4895095] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Tina Hecksher
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - Bo Jakobsen
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
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14
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15
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Adrjanowicz K, Kaminski K, Wlodarczyk P, Grzybowska K, Tarnacka M, Zakowiecki D, Garbacz G, Paluch M, Jurga S. Molecular Dynamics of the Supercooled Pharmaceutical Agent Posaconazole Studied via Differential Scanning Calorimetry and Dielectric and Mechanical Spectroscopies. Mol Pharm 2013; 10:3934-45. [DOI: 10.1021/mp4003915] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Adrjanowicz
- NanoBioMedical
Centre, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland
| | - K. Kaminski
- Institute
of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - P. Wlodarczyk
- Institute of Non-Ferrous Metals, ul. Sowinskiego 5, 44-100 Gliwice, Poland
| | - K. Grzybowska
- Institute
of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - M. Tarnacka
- Institute
of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - D. Zakowiecki
- Pharmaceutical Works “Polpharma”, Pelpińska 19, 83-200 Starogard Gdański, Poland
| | - G. Garbacz
- University of Greifswald, Institute of Pharmacy, Friedrich-Ludwig-Jahn-Strasse 17, Greifswald, Germany
| | - M. Paluch
- Institute
of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - S. Jurga
- NanoBioMedical
Centre, Adam Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland
- Department
of Macromolecular Physics, Adam Mickiewicz University, ul. Umultowska
85, 61-614 Poznan, Poland
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16
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Klieber C, Hecksher T, Pezeril T, Torchinsky DH, Dyre JC, Nelson KA. Mechanical spectra of glass-forming liquids. II. Gigahertz-frequency longitudinal and shear acoustic dynamics in glycerol and DC704 studied by time-domain Brillouin scattering. J Chem Phys 2013; 138:12A544. [DOI: 10.1063/1.4789948] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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17
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Preuß M, Gainaru C, Hecksher T, Bauer S, Dyre JC, Richert R, Böhmer R. Experimental studies of Debye-like process and structural relaxation in mixtures of 2-ethyl-1-hexanol and 2-ethyl-1-hexyl bromide. J Chem Phys 2012; 137:144502. [DOI: 10.1063/1.4755754] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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18
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Gainaru C, Hecksher T, Olsen NB, Böhmer R, Dyre JC. Shear and dielectric responses of propylene carbonate, tripropylene glycol, and a mixture of two secondary amides. J Chem Phys 2012; 137:064508. [DOI: 10.1063/1.4740236] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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19
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Buchenau U. Bulk and shear relaxation in glasses and highly viscous liquids. J Chem Phys 2012; 136:224512. [DOI: 10.1063/1.4726459] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Niss K, Gundermann D, Christensen T, Dyre JC. Dynamic thermal expansivity of liquids near the glass transition. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:041501. [PMID: 22680477 DOI: 10.1103/physreve.85.041501] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Indexed: 06/01/2023]
Abstract
Based on previous works on polymers by Bauer et al. [Phys. Rev. E 61, 1755 (2000)], this paper describes a capacitative method for measuring the dynamical expansion coefficient of a viscous liquid. Data are presented for the glass-forming liquid tetramethyl tetraphenyl trisiloxane (DC704) in the ultraviscous regime. Compared to the method of Bauer et al., the dynamical range has been extended by making time-domain experiments and by making very small and fast temperature steps. The modeling of the experiment presented in this paper includes the situation in which the capacitor is not full because the liquid contracts when cooling from room temperature down to around the glass-transition temperature, which is relevant when measuring on a molecular liquid rather than a polymer.
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Affiliation(s)
- Kristine Niss
- DNRF Centre Glass and Time, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
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21
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Jakobsen B, Hecksher T, Christensen T, Olsen NB, Dyre JC, Niss K. Communication: Identical temperature dependence of the time scales of several linear-response functions of two glass-forming liquids. J Chem Phys 2012; 136:081102. [DOI: 10.1063/1.3690083] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Abstract
The asymmetry model for the highly viscous flow postulates thermally activated jumps from a practically undistorted ground state to strongly distorted, but stable structures, with a pronounced Eshelby backstress from the distorted surroundings. The viscosity is ascribed to those stable distorted structures which do not jump back, but relax by the relaxation of the surrounding viscoelastic matrix. It is shown that this mechanism implies a description in terms of the shear compliance, with a viscosity which can be calculated from the cutoff of the retardation spectrum. Consistency requires that this cutoff lies close to the Maxwell time. The improved asymmetry model compares well with experiment.
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Affiliation(s)
- U Buchenau
- Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, D-52425 Jülich, Federal Republic of Germany.
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23
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Sağlanmak N, Nielsen AI, Olsen NB, Dyre JC, Niss K. An electrical circuit model of the alpha-beta merging seen in dielectric relaxation of ultraviscous liquids. J Chem Phys 2010; 132:024503. [DOI: 10.1063/1.3270164] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Neslihan Sağlanmak
- Department of Sciences, DNRF Center Glass and Time, IMFUFA, Roskilde University, Universitetsvej 1, Roskilde 4000, Denmark
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25
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Huang W, Richert R. Dynamics of glass-forming liquids. XIII. Microwave heating in slow motion. J Chem Phys 2009; 130:194509. [DOI: 10.1063/1.3139519] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Torchinsky DH, Johnson JA, Nelson KA. A direct test of the correlation between elastic parameters and fragility of ten glass formers and their relationship to elastic models of the glass transition. J Chem Phys 2009; 130:064502. [DOI: 10.1063/1.3072476] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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27
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Maggi C, Jakobsen B, Christensen T, Olsen NB, Dyre JC. Supercooled Liquid Dynamics Studied via Shear-Mechanical Spectroscopy. J Phys Chem B 2008; 112:16320-5. [DOI: 10.1021/jp805097r] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Claudio Maggi
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - Bo Jakobsen
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - Tage Christensen
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - Niels Boye Olsen
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
| | - Jeppe C. Dyre
- DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
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Niss K, Dalle-Ferrier C, Giordano VM, Monaco G, Frick B, Alba-Simionesco C. Glassy properties and viscous slowing down: An analysis of the correlation between nonergodicity factor and fragility. J Chem Phys 2008; 129:194513. [DOI: 10.1063/1.3005646] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jakobsen B, Maggi C, Christensen T, Dyre JC. Investigation of the shear-mechanical and dielectric relaxation processes in two monoalcohols close to the glass transition. J Chem Phys 2008; 129:184502. [DOI: 10.1063/1.3007988] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Mandanici A, Huang W, Cutroni M, Richert R. Dynamics of glass-forming liquids. XII. Dielectric study of primary and secondary relaxations in ethylcyclohexane. J Chem Phys 2008; 128:124505. [PMID: 18376941 DOI: 10.1063/1.2844797] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dynamics of ethylcyclohexane are investigated by high resolution dielectric spectroscopy aiming to characterize the relevant relaxational features of this simple system in its fluid, supercooled liquid, and glassy states. The dielectric signature of structural relaxation is a primary loss peak with amplitude Deltaepsilon=0.01, and a secondary loss process is found in the glassy state. This beta relaxation is compared with a "slow" process revealed by ultrasonics and with previously found gamma and chi processes in similar materials containing the cyclohexyl group. The results suggest that this secondary process is an intramolecular mode rather than a Johari-Goldstein process, consistent with its persistence in the liquid state at slow relaxation times which exceed those of the alpha process. The dielectric activity of such a slow process requires that the dipole magnitude changes with the intramolecular transition, whereas a change in dipole direction only would be masked by the faster structural relaxation.
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Affiliation(s)
- Andrea Mandanici
- Dipartimento di Fisica, Università di Messina, 98100 Messina, Italy
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Wang LM, Liu R, Wang WH. Relaxation time dispersions in glass forming metallic liquids and glasses. J Chem Phys 2008; 128:164503. [DOI: 10.1063/1.2904559] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Buchenau U, Ohl M, Wischnewski A. A new interpretation of dielectric data in molecular glass formers. J Chem Phys 2006; 124:94505. [PMID: 16526865 DOI: 10.1063/1.2176618] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Literature dielectric data of glycerol, propylene carbonate, and ortho-terphenyl show that the measured dielectric relaxation is a decade faster than the Debye expectation but still a decade slower than the breakdown of the shear modulus. From a comparison of time scales, the dielectric relaxation seems to be due to a process which relaxes not only the molecular orientation but also the entropy, the short range order, and the density. On the basis of this finding, we propose an alternative to the Gemant-DiMarzio-Bishop extension of the Debye picture.
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Affiliation(s)
- U Buchenau
- Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, D-52425 Jülich, Federal Republic of Germany.
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