Interactions, structural ordering and phase transitions in colloidal dispersions

Arora, Akhi̇lesh; Tata, B. V. R.

doi:10.1016/s0001-8686(98)00061-x

Cited by 96 publications

(94 citation statements)

References 181 publications

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“…In a typical inhomogeneous phase, the stable voids are coexisting with ordered structures. Such phase transition has been observed both in experiment and in MC simulations, which is suggested to prove the existence of a long-range attraction in the interparticle interaction [32]. Fig.…”

Section: Resultssupporting

confidence: 53%

“…Later experiments on charged colloidal suspensions seems to confirm this by showing voids coexisting with dense amorphous regions [33]. Such agreement between experiments and simulations is considered to be a proof that SI potential can explain the reentrant phase transition of charge stabilized colloidal dispersions by varying the charge density [32,34]. As mentioned already, the number of particles used in MC simulations is only N = 432.…”

Section: Resultsmentioning

confidence: 60%

“…The variations of size and charge from particle to particle can greatly influence the phase behaviors of the colloidal suspension. For instance, some studies have shown that beyond a critical polydispersity the colloidal crystals spontaneously transform to an amorphous structure [32,35]. (3) The effect of many-body interaction.…”

Section: Resultsmentioning

confidence: 99%

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Molecular dynamics study of homogeneous and inhomogeneous phase in charged colloids: The influence of surface charge density

Ouyang

Zhou

et al. 2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• Investigate the dynamic process of crystallization and voids formation in charged colloids.• Influence of surface charge density on homogeneous to inhomogeneous phase transition.• Finite size effects on the phase behavior of charged colloids.• Show that Sogami and Ise theory cannot explain the reentrant transition of highly charged colloidal systems. Compared with previous Mote Carlo (MC) simulations with 432 particles, molecular dynamics (MD) simulations with much larger number of particles have been carried out to investigate the dynamic process of the structural ordering and voids formation in charge stabilized colloidal suspensions. Sogami and Ise (SI) potential which has a long-range attraction is used to represent the interaction between colloidal particles. As increasing the surface charge density on the colloidal particles, the data obtained from the simulations, such as the crystallization, bcc-fcc phase transition, homogeneous to inhomogeneous transition and the voids formation, are in agreement with previous observations of MC simulations and experiments. The effects of particle number used in the simulations are studied in detail. MD simulations in highly charged colloidal system with small sizes show very few crystallized particles, in accord with the results of MC simulations. However, the structure in the system with larger number of particles is always the voids coexisting crystallites instead of a glasslike or disordered inhomogeneous phase, indicating that the glasslike or disordered phase region obtained at very high charge density in small system is an artifact produced by very limited number of particles used in the simulations. Therefore, SI potential is not applicable for explaining the reentrant transition of highly charged colloidal systems.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 60%

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Molecular dynamics study of homogeneous and inhomogeneous phase in charged colloids: The influence of surface charge density

Ouyang

Zhou

et al. 2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The freezing and melting of charge-stabilized colloidal suspensions has been studied extensively by representing the colloidal system as a simple Yukawa fluid; many excellent review articles are available [83,84,85,86,87]. The phase-behavior has been investigated analytically [85,88,89,90] and by computer simulation [81,82,91,92,93,94].…”

Section: The Solid-liquid Phase Behavior Of a Simple Yukawa Fluidmentioning

confidence: 99%

Many-body interactions and the melting of colloidal crystals

Dobnikar

Chen

Rzehak

et al. 2003

The Journal of Chemical Physics

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We study the melting behavior of charged colloidal crystals, using a simulation technique that combines a continuous mean-field Poisson-Boltzmann description for the microscopic electrolyte ions with a Brownian-dynamics simulation for the mesoscopic colloids. This technique ensures that many-body interactions between the colloids are fully taken into account, and thus allows us to investigate how many-body interactions affect the solid-liquid phase behavior of charged colloids.Using the Lindemann criterion, we determine the melting line in a phase-diagram spanned by the colloidal charge and the salt concentration. We compare our results to predictions based on the established description of colloidal suspensions in terms of pairwise additive Yukawa potentials, and find good agreement at high-salt, but not at low-salt concentration. Analyzing the effective pairinteraction between two colloids in a crystalline environment, we demonstrate that the difference in the melting behavior observed at low salt is due to many-body interactions. If the salt concentration is high, we find configuration-independent pair-forces of perfect Yukawa form with effective charges and screening constants that are in good agreement with well-established theories. At low added salt, however, the pair-forces are Yukawa-like only at short distances with effective parameters that depend on the analyzed colloidal configuration. At larger distances, in contrast, the pair-forces decay to zero much faster than they would following a Yukawa force law. This is explained with a screening effect of the macroions. Based on these findings, we suggest a simple model potential for colloids in suspension which has the form of a Yukawa potential, truncated after the first coordination shell of a colloid in a crystal. Using this potential in a one-component simulation, we find a melting line that shows good agreement with the one derived from the full PoissonBoltzmann-Brownian-dynamics simulation.2

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“…Both quasi-two-dimensional sheets as well as three-dimensional bulk samples can be realized such that the effective dimensionality is tunable between two and three dimensions. The plasma crystal reveals a strong analogy to an ordinary colloidal crystal [7][8][9] of charged suspensions as the dusty particles are of mesoscopic size and the effective interactions are screened by the presence of microions. Furthermore, in both cases, the particles possess an intrinsic polydispersity in their charge which may also influence the phase behaviour as compared to a one-component (monodisperse) system [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Melting of dusty plasma crystals in oscillating external fields

Hoffmann¹,

Löwen²

2000

J. Phys.: Condens. Matter

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Abstract. The melting transition of a charge-polydisperse dusty plasma crystal under the influence of a time-dependent oscillating field is studied within a simple model. The stochastic dynamics of the dust particles is modelled by a Fokker-Planck description. Using non-equilibrium computer simulations we detect a non-monotonic behaviour of the melting line as a function of the frequency of the external field. This is attributed to a cage resonance effect which is controlled by the intrinsic polydispersity of the sample. The results are qualitatively explained within a cage theory of the polydisperse solid combined with a generalized Lindemann rule of melting.

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Interactions, structural ordering and phase transitions in colloidal dispersions

Cited by 96 publications

References 181 publications

Molecular dynamics study of homogeneous and inhomogeneous phase in charged colloids: The influence of surface charge density

Molecular dynamics study of homogeneous and inhomogeneous phase in charged colloids: The influence of surface charge density

Many-body interactions and the melting of colloidal crystals

Melting of dusty plasma crystals in oscillating external fields

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