Amorphous Clustering in Highly Charged Dilute Poly(chlorostyrene-styrene sulfonate) Colloids

Tata, B. V. R.; Yamahara, Eiji; Rajamani, Paulraj; Ise, Norio

doi:10.1103/physrevlett.78.2660

Cited by 82 publications

(55 citation statements)

References 19 publications

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“…Unlike the results of previous MC simulations (only one or two voids formed probably due to the small size of system), there are several voids formed in the colloidal system. In experimental observations, the system that behaves as voids coexisting with order or disorder regions shows a spongy structure [10,11,33]. From this point of view, our results of MD simulations with much bigger system sizes are more likely to be in agreement with experimental results.…”

Section: Resultssupporting

confidence: 81%

“…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].…”

Section: Resultssupporting

confidence: 55%

“…In system with small sizes where N = 432, MD simulations shows very few crystallized particles, which is in agreement with results of MC simulations, indicating that the glasslike or disordered phase region obtained at very high charge density in system of N = 432 is probably an artifact produced by small system size and periodic boundary conditions. However, the glasslike or disordered phase coexisting with voids is indeed investigated in some experiments [10,33], so it seems that the results of our simulations are not in agreement with experimental observations. There may be possibly some reasons listed here: (1) The colloidal particles used in experiments are fairy large, and the relatively low diffusibility of such large particles make the system to cost a long time to reach the equilibrium, so the ordered structures could not form within the observation period.…”

Section: Resultscontrasting

confidence: 53%

See 2 more Smart Citations

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: 81%

Section: Resultssupporting

confidence: 55%

Section: Resultscontrasting

confidence: 53%

See 1 more Smart Citation

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 authors considered it clear that this entity was chemically distinct from water. The most conclusive findings were the observations of void structures of the order of 25-50 μm in a highly purified dispersion of latex particles [20][21][22][23] and long-range exclusion zones of latex microspheres of the order of 100 μm from the gel surface [24,25]. Solute-free zones usually form next to hydrophilic surfaces in an aqueous solution.…”

Section: Introductionmentioning

confidence: 82%

Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions

Kaledin

Tepper

Kaledin

2015

International Journal of Smart and Nano Materials

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Aluminum oxide-hydroxide nanolayer with a thickness of approximately 1.2 nm is electroadhesively deposited onto silicious support material with large surface area of about 50 m 2 /g, forming a highly electropositive composite of boehmite nanolayer in the form of monocrystalline oxide/hydroxide (α-Al 2 O 3 ·H 2 O) on the second electronegative solid. The composite can be viewed as a sphere with a rough surface and charge density of approximately 0.08 C/m 2 . This creates a significant electric field with negligible screening (ka ( 1) in the region close to the surface of the nanocomposite. This field attracts nano-and micron-sized particles from as far as 200 μm in a few seconds, many orders of magnitude greater than conventional Derjaguin-LandauVerwey-Overbeek (DLVO) theory, which predicts only nanometer-scale effects arising from the presence of the surface. The strong electric field on the surface is then able to retain small particles such as viruses, atomically thin sheets of graphene oxide, RNA, DNA, proteins, dyes as well as heavy metals such as cobalt, arsenic, and lead.Alumina's nanolayer surface can be further functionalized by adding other submicron or nano-sized particles to target a specific contaminant. An example is shown where alumina nanolayer is coated with nano-sized iron monohydrate to yield an arsenic sorbent that shows high sorption capacity.

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“…Clusters of particles can form for two different reasons: depletion forces [5,6], like-charge attraction mediated by the counterions in the solvent [7,8], or van der Waals attraction [9][10][11]. The shear flow can either support cluster formation at low shear rates, or it can suppress cluster formation at high shear rates as we have shown in ref.…”

Section: Simulating Sheared Claymentioning

confidence: 99%

Simulation of dense colloids

Herrmann¹,

Harting²,

Hecht³

et al. 2008

Braz. J. Phys.

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We present in this proceeding recent large scale simulations of dense colloids. On one hand we simulate model clay consisting of nanometric aluminum oxyde spheres in water using realistic effective electrostatic interactions and Van der Waals attractions, known as DLVO potentials and a combination of molecular dynamics (MD) and stochastic rotation dynamics (SRD). We find pronounced cluster formation and retrieve the shear softening of the viscosity in quantitative agreement with experiments. On the other hand we study the velocity probability distribution functions (PDF) of sheared hard-sphere colloids using a combination of MD with lattice Boltzmann and find strong deviations from a Maxwell-Boltzmann distribution. We find a Gaussian core and an exponential tail over more than six orders of magnitude of probability. The simulation data follow very well a simple theory. We show that the PDFs scale with shear rateγ as well as particle volume concentration φ, and kinematic viscosity ν.

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Amorphous Clustering in Highly Charged Dilute Poly(chlorostyrene-styrene sulfonate) Colloids

Cited by 82 publications

References 19 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

Long-range attractive forces extending from the alumina’s nanolayer surface in aqueous solutions

Simulation of dense colloids

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