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Peredo-Ortiz R, Zubieta Rico PF, Cortés-Morales EC, Pérez-Ángel GG, Voigtmann T, Medina-Noyola M, Elizondo-Aguilera LF. Non-equilibrium relaxation and aging in the dynamics of a dipolar fluid quenched towards the glass transition. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:084003. [PMID: 34798621 DOI: 10.1088/1361-648x/ac3b75] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 11/19/2021] [Indexed: 06/13/2023]
Abstract
The recently developed non-equilibrium self-consistent generalized Langevin equation theory of the dynamics of liquids of non-spherically interacting particles [2016J. Phys. Chem. B1207975] is applied to the description of the irreversible relaxation of a thermally and mechanically quenched dipolar fluid. Specifically, we consider a dipolar hard-sphere liquid quenched (attw= 0) from full equilibrium conditions towards different ergodic-non-ergodic transitions. Qualitatively different scenarios are predicted by the theory for the time evolution of the system after the quench (tw> 0), that depend on both the kind of transition approached and the specific features of the protocol of preparation. Each of these scenarios is characterized by the kinetics displayed by a set of structural correlations, and also by the development of two characteristic times describing the relaxation of the translational and rotational dynamics, allowing us to highlight the crossover from equilibration to aging in the system and leading to the prediction of different underlying mechanisms and relaxation laws for the dynamics at each of the glass transitions explored.
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Affiliation(s)
- Ricardo Peredo-Ortiz
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava 6, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, Mexico
| | - Pablo F Zubieta Rico
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava 6, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, Mexico
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States of America
| | - Ernesto C Cortés-Morales
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava 6, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, Mexico
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States of America
| | - Gabriel G Pérez-Ángel
- Departamento de Física Aplicada, CINVESTAV del IPN, A. P. 73 'Cordemex', 97310 Mérida, Yucatán, Mexico
| | - Thomas Voigtmann
- Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR), Linder Höhe 51170 Köln, Germany
- Department of Physics, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Magdaleno Medina-Noyola
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava 6, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, Mexico
| | - Luis F Elizondo-Aguilera
- Instituto de Física, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava 6, Zona Universitaria, 78290 San Luis Potosí, San Luis Potosí, Mexico
- Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft-und Raumfahrt (DLR), Linder Höhe 51170 Köln, Germany
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2
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Structural, Thermodiffusive and Thermoelectric Properties of Maghemite Nanoparticles Dispersed in Ethylammonium Nitrate. CHEMENGINEERING 2020. [DOI: 10.3390/chemengineering4010005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ethylammonium nitrate (ionic liquid) based ferrofluids with citrate-coated nanoparticles and Na + counterions were synthesized for a wide range of nanoparticle (NP) volume fractions ( Φ ) of up to 16%. Detailed structural analyses on these fluids were performed using magneto-optical birefringence and small angle X-ray scattering (SAXS) methods. Furthermore, the thermophoretic and thermodiffusive properties (Soret coefficient S T and diffusion coefficient D m ) were explored by forced Rayleigh scattering experiments as a function of T and Φ . They were compared to the thermoelectric potential (Seebeck coefficient, Se) properties induced in these fluids. The results were analyzed using a modified theoretical model on S T and Se adapted from an existing model developed for dispersions in more standard polar media which allows the determination of the Eastman entropy of transfer ( S ^ NP ) and the effective charge ( Z 0 e f f ) of the nanoparticles.
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Wei N, Déjardin PM, Kalmykov YP, Coffey WT. External dc bias-field effects in the nonlinear ac stationary response of dipolar particles in a mean-field potential. Phys Rev E 2016; 93:042208. [PMID: 27176294 DOI: 10.1103/physreve.93.042208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 06/05/2023]
Abstract
External dc bias-field effects on the nonlinear dielectric relaxation and dynamic Kerr effect of a system of permanent dipoles in a uniaxial mean-field potential are studied via the rotational Brownian motion model postulated in terms of the infinite hierarchy of differential-recurrence equations for the statistical moments f_{n}(t)=〈P_{n}〉(t) (the expectation value of the Legendre polynomials P_{n}). By solving these equations, the nonlinear dielectric and Kerr-effect ac stationary responses are evaluated for arbitrary dc field strength via perturbation theory in the ac field. Simple analytic equations based on the large separation of the time scales of the fast intrawell and slow overbarrier (interwell) relaxation processes are also derived.
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Affiliation(s)
- Nijun Wei
- Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland
| | - Pierre-Michel Déjardin
- Laboratoire de Mathématiques et de Physique (LAMPS, EA4217), Université de Perpignan Via Domitia, F-66860, Perpignan, France
| | - Yuri P Kalmykov
- Laboratoire de Mathématiques et de Physique (LAMPS, EA4217), Université de Perpignan Via Domitia, F-66860, Perpignan, France
| | - William T Coffey
- Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland
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Mamusa M, Sirieix-Plénet J, Perzynski R, Cousin F, Dubois E, Peyre V. Concentrated assemblies of magnetic nanoparticles in ionic liquids. Faraday Discuss 2015; 181:193-209. [DOI: 10.1039/c5fd00019j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Maghemite (γ-Fe2O3) nanoparticles (NPs) can be successfully dispersed in a protic ionic liquid, ethylammonium nitrate (EAN), by transfer from aqueous dispersions into EAN. As the aqueous systems are well controlled, several parameters can be tuned. Their crucial role towards the interparticle potential and the structure of the dispersions is evidenced: (i) the size of the NPs tunes the interparticle attraction monitoring dispersions to be either monophasic or gas–liquid-like phase separated; (ii) the nature of the initial counterion in water (here sodium, lithium or ethylammonium) and the amount of added water (<20 vol%) modulate the interparticle repulsion. Very concentrated dispersions with a volume fraction of around 25% are obtained thanks to the gas–liquid-like phase separations. Such conclusions are derived from a fine structural and dynamical study of the dispersions on a large range of spatial scales by coupling several techniques: chemical analyses, optical microscopy, dynamic light scattering, magneto-optic birefringence and small angle scattering.
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Affiliation(s)
- Marianna Mamusa
- Université Pierre et Marie Curie – Paris 6 – PHENIX UMR CNRS 8234
- Paris
- France
- Consorzio per lo Sviluppo dei Sistemi Grande Interfase (CSGI)
- FI
| | | | - Régine Perzynski
- Université Pierre et Marie Curie – Paris 6 – PHENIX UMR CNRS 8234
- Paris
- France
| | - Fabrice Cousin
- Lab. Léon Brillouin
- UMR CNRS 12
- CE Saclay
- Gif sur Yvette
- France
| | - Emmanuelle Dubois
- Université Pierre et Marie Curie – Paris 6 – PHENIX UMR CNRS 8234
- Paris
- France
| | - Véronique Peyre
- Université Pierre et Marie Curie – Paris 6 – PHENIX UMR CNRS 8234
- Paris
- France
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Jabbari-Farouji S, Wegdam GH, Bonn D. Aging of rotational diffusion in colloidal gels and glasses. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:041401. [PMID: 23214583 DOI: 10.1103/physreve.86.041401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Indexed: 06/01/2023]
Abstract
We study the rotational diffusion of aging Laponite suspensions for a wide range of concentrations using depolarized dynamic light scattering. The measured orientational correlation functions undergo an ergodic to nonergodic transition that is characterized by a concentration-dependent ergodicity-breaking time. We find that the relaxation times associated with rotational degree of freedom as a function of waiting time, when scaled with their ergodicity-breaking time, collapse on two distinct master curves. These master curves are similar to those previously found for the translational dynamics; the two different classes of behavior were attributed to colloidal gels and glasses. Therefore, the aging dynamics of rotational degree of freedom provides another signature of the distinct dynamical behavior of colloidal gels and glasses.
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Affiliation(s)
- S Jabbari-Farouji
- LPTMS, CNRS and Université Paris-Sud, UMR8626, Bat. 100, 91405 Orsay, France
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Li JLW, Ong WL, Zheng KHR. Anisotropic scattering effects of a gyrotropic sphere characterized using the T-matrix method. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:036601. [PMID: 22587196 DOI: 10.1103/physreve.85.036601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Indexed: 05/31/2023]
Abstract
Solutions for characterizing both electromagnetic wave propagation in, and scattering by, a gyrotropic sphere are obtained based on some recently published literature. Both gyrotropic permittivity and permeability tensors are considered herein, and both transmitted internal fields and scattered external fields are derived theoretically. Compared with problems of a uniaxial sphere, a gyroelectric sphere, and a gyromagnetic sphere, the scattering problem considered here is found to be astonishingly complicated but more generalized in formulation and solution procedure. Numerical validations are made by reducing our results to a gyromagnetic sphere and comparing them with the results obtained using the Fourier transform method, where excellent agreements are observed. Then, radar cross sections (RCSs) versus electric and magnetic gyrotropy ratios are computed, while hybrid effects due to both electric and magnetic gyrotropies are studied extensively, where some special cases of uniaxial spheres are demonstrated. It is shown that characteristics of gyrotropy parameters in Cartesian coordinates may lead to considerably large variations in RCS values, elucidating physical significance of gyrotropy and anisotropy ratios in scattering control. The generalized formulation of the problem is expected to have wide practical applications, while some features of this gyrotropic sphere may help other researchers or engineers to understand more physical insight. In addition, some critical mistakes made in literature were corrected.
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Affiliation(s)
- Joshua Le-Wei Li
- Institute of Electromagnetics and School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, China 611731
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Kinetic analyses and performance of a colloidal magnetic nanoparticle based immunoassay dedicated to allergy diagnosis. Anal Bioanal Chem 2011; 400:3395-407. [DOI: 10.1007/s00216-011-5021-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Revised: 04/12/2011] [Accepted: 04/12/2011] [Indexed: 11/26/2022]
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