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Volkov NA, Eroshkin YA, Shchekin AK, Koltsov IN, Tretyakov NY, Turnaeva EA, Volkova SS, Groman AA. Molecular Dynamics of Decane Solubilization and Diffusion of Aggregates Consisting of Surfactant and Decane Molecules in Aqueous Solutions. COLLOID JOURNAL 2021. [DOI: 10.1134/s1061933x21040141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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Durand-Vidal S, Bernard O, Medoš Ž, Bešter-Rogač M. Theoretical interpretation of conductivity data below and above the CMC: The case of alkaline ion decanoate solutions. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112968] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sharker KK, Yusa SI, Phan CM. Micellar formation of cationic surfactants. Heliyon 2019; 5:e02425. [PMID: 31538114 PMCID: PMC6745450 DOI: 10.1016/j.heliyon.2019.e02425] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 07/17/2019] [Accepted: 09/02/2019] [Indexed: 11/28/2022] Open
Abstract
The micellar structure of six alkyl trimethylammonium halides was studied via conductivity. It was found that the aggregation number increased with the decreasing carbon chain length. Furthermore, Br− significantly enhanced the micellar formation over Cl−. However, the aggregation number and ionization degree remain similar for both anions. The modelling results validate that the counter-anions affect micellar formation via equilibrium constants, instead of their hydration size. In particular, the association constants between surfactant (both monomer and micelle) and Br− are significantly higher than Cl−. This is consistent with the qualitative description of hydrated Br− in the literature. The experimental and modelling results confirm that micelles are formed via “ion-paring/hydration” structure, instead of the conventional “packing” concept.
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Affiliation(s)
- Komol Kanta Sharker
- Graduate School of Engineering, University of Hyogo, Shosha, Himeji, 671-2280, Japan
| | - Shin-Ichi Yusa
- Graduate School of Engineering, University of Hyogo, Shosha, Himeji, 671-2280, Japan
| | - Chi Minh Phan
- Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam
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Dahirel V, Zhao X, Jardat M. Comparison of different coupling schemes between counterions and charged nanoparticles in multiparticle collision dynamics. Phys Rev E 2016; 94:023317. [PMID: 27627422 DOI: 10.1103/physreve.94.023317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Indexed: 11/07/2022]
Abstract
We applied the multiparticle collision dynamics (MPC) simulation technique to highly asymmetric electrolytes in solution, i.e., charged nanoparticles and their counterions in a solvent. These systems belong to a domain of solute size which ranges between the electrolyte and the colloidal domains, where most analytical theories are expected to fail, and efficient simulation techniques are still missing. MPC is a mesoscopic simulation method which mimics hydrodynamics properties of a fluid, includes thermal fluctuations, and can be coupled to a molecular dynamics of solutes. We took advantage of the size asymmetry between nanoparticles and counterions to treat the coupling between solutes and the solvent bath within the MPC method. Counterions were coupled to the solvent bath during the collision step and nanoparticles either through a direct interaction force or with stochastic rotation rules which mimic stick boundary conditions. Moreover, we adapted the simulation procedure to address the issue of the strong electrostatic interactions between solutes of opposite charges. We show that the short-ranged repulsion between counterions and nanoparticles can be modeled by stochastic reflection rules. This simulation scheme is very efficient from a computational point of view. We have also computed the transport coefficients for various densities. The diffusion of counterions was found in one case to increase slightly with the volume fraction of nanoparticles. The deviation of the electric conductivity from the ideal behavior (solutes at infinite dilution without any direct interactions) is found to be strong.
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Affiliation(s)
- Vincent Dahirel
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234, PHENIX, F-75005 Paris, France
| | - Xudong Zhao
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234, PHENIX, F-75005 Paris, France
| | - Marie Jardat
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234, PHENIX, F-75005 Paris, France
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Diffusivities of species in ionic micellar solutions: Molecular dynamic simulation. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.10.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ancian B, Bernard O, Chevalet J, Dahirel V, Devilliers D, Dubois E, Dufrêche JF, Durand-Vidal S, Groult H, Jardat M, Lantelme F, Malikova N, Marry V, Mériguet G, Perzynski R, Rollet AL, Rotenberg B, Salanne M, Simon C. Pierre Turq, an inspirational scientist in charge and at interfaces. Mol Phys 2014. [DOI: 10.1080/00268976.2014.885094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Lucas I, Durand-Vidal S, Bernard O, Dahirel V, Dubois E, Dufrêche J, Gourdin-Bertin S, Jardat M, Meriguet G, Roger G. Influence of the volume fraction on the electrokinetic properties of maghemite nanoparticles in suspension. Mol Phys 2014. [DOI: 10.1080/00268976.2014.906672] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Batôt G, Dahirel V, Mériguet G, Louis AA, Jardat M. Dynamics of solutes with hydrodynamic interactions: comparison between Brownian dynamics and stochastic rotation dynamics simulations. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:043304. [PMID: 24229301 DOI: 10.1103/physreve.88.043304] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Indexed: 06/02/2023]
Abstract
The dynamics of particles in solution or suspension is influenced by thermal fluctuations and hydrodynamic interactions. Several mesoscale methods exist to account for these solvent-induced effects such as Brownian dynamics with hydrodynamic interactions and hybrid molecular dynamics-stochastic rotation dynamics methods. Here we compare two ways of coupling solutes to the solvent with stochastic rotation dynamics (SRD) to Brownian dynamics with and without explicit hydrodynamic interactions. In the first SRD scheme [SRD with collisional coupling (CC)] the solutes participate in the collisional step with the solvent and in the second scheme [SRD with central force coupling (CFC)] the solutes interact through direct forces with the solvent, generating slip boundary conditions. We compare the transport coefficients of neutral and charged solutes in a model system obtained by these simulation schemes. Brownian dynamics without hydrodynamic interactions is used as a reference to quantify the influence of hydrodynamics on the transport coefficients as modeled by the different methods. We show that, in the dilute range, the SRD CFC method provides results similar to those of Brownian dynamics with hydrodynamic interactions for the diffusion coefficients and for the electrical conductivity. The SRD CC scheme predicts diffusion coefficients close to those obtained by Brownian dynamic simulations without hydrodynamic interactions, but accounts for part of the influence of hydrodynamics on the electrical conductivity.
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Affiliation(s)
- G Batôt
- UPMC Univ Paris 06, UMR CNRS 7195 PECSA, F-75005 Paris, France
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Jardat M, Hribar-Lee B, Dahirel V, Vlachy V. Self-diffusion and activity coefficients of ions in charged disordered media. J Chem Phys 2012; 137:114507. [DOI: 10.1063/1.4752111] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Pagonabarraga I, Rotenberg B, Frenkel D. Recent advances in the modelling and simulation of electrokinetic effects: bridging the gap between atomistic and macroscopic descriptions. Phys Chem Chem Phys 2010; 12:9566-80. [DOI: 10.1039/c004012f] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dahirel V, Jardat M, Dufrêche JF, Turq P. Two-scale Brownian dynamics of suspensions of charged nanoparticles including electrostatic and hydrodynamic interactions. J Chem Phys 2009; 131:234105. [DOI: 10.1063/1.3273871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Roger GM, Durand-Vidal S, Bernard O, Turq P. Electrical conductivity of mixed electrolytes: Modeling within the mean spherical approximation. J Phys Chem B 2009; 113:8670-4. [PMID: 19485401 DOI: 10.1021/jp901916r] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The purpose of this study is to predict the electrical conductivity of an electrolyte solution containing several simple ionic species. Explicit equations of the MSA-transport theory for the electrical conductivity in this complex solution are given. The theoretical conductivity of simple salts is first compared to experimental results of the literature to deduce the sizes of the ions. These sizes allow us to calculate the conductivity for a mixture of several ionic species without any additional parameter. We have also measured the electrical conductivity of solutions of LiCl, NaCl, and KCl and of KBr and MgCl(2) at 25 degrees C. A very good agreement between theoretical calculations and experimental values is obtained for each studied system.
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Roger GM, Durand-Vidal S, Bernard O, Turq P, Perger TM, Bester-Rogac M. Interpretation of conductivity results from 5 to 45 degrees C on three micellar systems below and above the CMC. J Phys Chem B 2008; 112:16529-38. [PMID: 19368011 DOI: 10.1021/jp804971c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Electrical conductivity has been used at different temperatures to study three micellar systems: tetradecyltrimethylammonium chloride (TTACl), dodecyltrimethylammonium chloride (DTACl), and decyltrimethylammonium chloride (DeTACl). A phenomenon of premicellization is observed for DeTACl and DTACl below the critical micellar concentration (CMC). Association constants are introduced in the MSA-transport theory to correctly reproduce experimental conductivity and also calculate the effective charge of the micelles and their degree of dissociation. Various mechanisms are considered to explain premicellization. The formation of a neutral pair followed by an association involving two monomers and a counterion appears to be the most probable first step in the premicellization process.
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Affiliation(s)
- G M Roger
- Laboratoire Liquides loniques et Interfaces Chargées, Université Pierre et Marie Curie-Paris 6, UMR CNRS 7612, case courrier 51, 4 place Jussieu F-75252 Paris Cedex 05, France.
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Dufrêche JF, Jardat M, Turq P, Bagchi B. Electrostatic Relaxation and Hydrodynamic Interactions for Self-Diffusion of Ions in Electrolyte Solutions. J Phys Chem B 2008; 112:10264-71. [DOI: 10.1021/jp801796g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J.-F. Dufrêche
- Laboratoire Liquides Ioniques et Interfaces Chargées, case courrier 51, Université P. et M. Curie - Paris 6, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France and Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India 560012
| | - M. Jardat
- Laboratoire Liquides Ioniques et Interfaces Chargées, case courrier 51, Université P. et M. Curie - Paris 6, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France and Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India 560012
| | - P. Turq
- Laboratoire Liquides Ioniques et Interfaces Chargées, case courrier 51, Université P. et M. Curie - Paris 6, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France and Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India 560012
| | - B. Bagchi
- Laboratoire Liquides Ioniques et Interfaces Chargées, case courrier 51, Université P. et M. Curie - Paris 6, CNRS, 4 place Jussieu, 75252 Paris Cedex 05, France and Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, India 560012
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Jardat M, Turq P. Brownian Simulations Contribution to the Study of Ionic Dynamics in Aqueous Solutions. Z PHYS CHEM 2008. [DOI: 10.1524/zpch.218.6.699.33458] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
We review some results concerning the dynamics of ionic solutions that we have recently obtained by Brownian dynamics simulations; we also present new results concerning the dynamical behavior of asymmetrical electrolytes (1–10 and 2–20 electrolytes). The Brownian dynamics treats the solution in the framework of the continuous solvent model, with a ‘soft-core’ version of the primitive model. Both direct interactions and hydrodynamic interactions between solutes are taken into account in the calculations. The method allows one to obtain the self-diffusion coefficient of each ion and the electrical conductivity of the solution. The computed transport coefficients are in good agreement with experimental determinations in various cases (in aqueous solutions of 1–1 electrolytes as well as in aqueous solutions of micelles). We show that hydrodynamic interactions must be taken into account to obtain electrical conductivities in agreement with experiments. The effect of hydrodynamic interactions on the self-diffusion is also striking, especially in solutions of asymmetrical electrolytes. If this effect remains weak in simple electrolyte solutions and for small ions in 1–20 and 2–20 electrolyte solutions, it is great for macroions in latter solutions (increase of about 15 to 40%).
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Dahirel V, Jardat M, Dufrêche JF, Lucas I, Durand-Vidal S, Turq P. Coarse-graining in suspensions of charged nanoparticles. PURE APPL CHEM 2008. [DOI: 10.1351/pac200880061229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A coarse-grain description of nanocolloidal suspensions in the presence of an added salt is presented here. It enables us to simulate trajectories of the nanoparticles from effective functions that depend on average densities of salt ions. In practice, the ion-averaged effective potential is used as input of a Brownian dynamics (BD) simulation. This potential may be derived by various methods, ranging from purely analytical to fully numerical ones. For the description of dynamical properties, this simulation also requires an effective diffusion coefficient that must be calculated or experimentally determined, and that accounts for the effects of microions on the mobility of the nanoparticles. The different versions of our coarse-graining procedure are applied to the case of a maghemite suspension, for which an explicit description of all ions would be very time-consuming.
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Affiliation(s)
- Vincent Dahirel
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
| | - Marie Jardat
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
| | - Jean-François Dufrêche
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
| | - Ivan Lucas
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
| | - Serge Durand-Vidal
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
| | - Pierre Turq
- 1Ionic Liquids and Charged Interfaces Laboratory, Université Pierre et Maire Curie-Paris 6, UMR CNRS 761 2, case courrier 51, 4 place Jussieu F-75005 Paris Cedex 05, France
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Jardat M, Hribar-Lee B, Vlachy V. Self-diffusion coefficients of ions in the presence of charged obstacles. Phys Chem Chem Phys 2008; 10:449-57. [DOI: 10.1039/b711814g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dahirel V, Jardat M, Dufrêche JF, Turq P. New coarse-graining procedure for the dynamics of charged spherical nanoparticles in solution. J Chem Phys 2007; 126:114108. [PMID: 17381197 DOI: 10.1063/1.2710254] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A multiscale strategy based on the Brownian dynamics (BD) simulation method is presented here. It leads to an approximate but realistic reproduction of the dynamics of charged nanoparticles in suspension. This method is particularly suited to systems containing highly dissymmetric electrolytes with added salts, such as micellar suspensions or protein solutions. The coarse-graining procedure leads to a description where only the translational degrees of freedom of the nanoparticles are left, all the degrees of freedom related to the smallest solutes being rigorously averaged out. The authors' contribution aims at quantitatively evaluating the influence of the eliminated forces on the dynamics of the nanoparticles. For this purpose, an effective diffusion coefficient has to be calculated. In practice, this effective diffusion coefficient is taken as an input of a coarse-grained simulation that uses the potential of mean force between nanoparticles. The procedure has been validated by the quantitative comparison between the coarse-grained calculations and BD simulations at the "microscopic" level of description (which explicitly include microions). For a model of aqueous solutions of 10-1 electrolyte with a 1-1 added salt, the agreement is found to be excellent. This new method allows us to compute the diffusion coefficients of nanoparticles with a computation time at least one order of magnitude lower than with explicit BD.
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Affiliation(s)
- Vincent Dahirel
- Laboratoire Liquides Ioniques et Interfaces Chargées, Université Pierre et Marie Curie-Paris 6, UMR CNRS 7612, case courrier 51, 4 place Jussieu F-75252 Paris Cedex 05, France
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Jardat M, Dahirel V, Durand-Vidal S, Lucas I, Bernard O, Turq P. Effective charges of micellar species obtained from Brownian dynamics simulations and from an analytical transport theory. Mol Phys 2006. [DOI: 10.1080/00268970600997564] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Durand-Vidal S, Jardat M, Dahirel V, Bernard O, Perrigaud K, Turq P. Determining the Radius and the Apparent Charge of a Micelle from Electrical Conductivity Measurements by Using a Transport Theory: Explicit Equations for Practical Use. J Phys Chem B 2006; 110:15542-7. [PMID: 16884277 DOI: 10.1021/jp062956n] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We propose here a procedure which combines experiments and simple analytical formulas that allows us to determine good estimations of the size and charge of ionic micelles above the critical micellar concentration (cmc). First, the conductivity of n-tetradecyltrimethylammonium bromide and chloride (TTABr and TTACl, respectively) aqueous solutions was measured at 25 degrees C, before and above their cmc. Then, an analytical expression for the concentration dependence of the conductance of an ionic mixture with three species (monomers, micelles, and counterions) was developed and applied to the analysis of the experiments. The theoretical calculations use the mean spherical approximation (MSA) to describe equilibrium properties. Here, we propose new expressions for the electrical conductivity, adapted to the case of electrolytes that are dissymmetric in size, and applicable up to a total surfactant concentration of 0.1 mol L(-1). Moreover, we show that they are good approximations of the corresponding numerical results obtained from Brownian dynamics simulations. Since the analytical formulas given in the present paper involve a small number of unknown parameters, they allow one to derive the size and charge of macroions in solution from conductivity measurements.
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Affiliation(s)
- S Durand-Vidal
- UMR CNRS 7612, case courrier 51, Laboratoire Liquides Ioniques et Interfaces Chargées, Université Pierre et Marie Curie-Paris 6, 4 place Jussieu, F-75252 Paris Cedex 05, France.
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Mériguet G, Jardat M, Turq P. Structural properties of charge-stabilized ferrofluids under a magnetic field: A Brownian dynamics study. J Chem Phys 2004; 121:6078-85. [PMID: 15367036 DOI: 10.1063/1.1784434] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present Brownian dynamics simulations of real charge-stabilized ferrofluids, which are stable colloidal dispersions of magnetic nanoparticles, with and without the presence of an external magnetic field. The colloidal suspensions are treated as collections of monodisperse spherical particles, bearing point dipoles at their centers and undergoing translational and rotational Brownian motions. The overall repulsive isotropic interactions between particles, governed by electrostatic repulsions, are taken into account by a one-component effective pair interaction potential. The potential parameters are fitted in order that computed structure factors are close to the experimental ones. Two samples of ferrofluid differing by the particle diameter and consequently by the intensity of the magnetic interaction are considered here. The magnetization and birefringence curves are computed: a deviation from the ideal Langevin behaviors is observed if the dipolar moment of particles is sufficiently large. Structure factors are also computed from simulations with and without an applied magnetic field H: the microstructure of the repulsive ferrofluid becomes anisotropic under H. Even our simple modeling of the suspension allows us to account for the main experimental features: an increase of the peak intensity is observed in the direction perpendicular to the field whereas the peak intensity decreases in the direction parallel to the field.
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Affiliation(s)
- G Mériguet
- Laboratoire Liquides Ioniques et Interfaces Chargées, UMR CNRS 7612, Université Pierre et Marie Curie, case 51, 4 place Jussieu, 75252 Paris, France
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