On the Role of Hydrodynamic Interactions in Colloidal Gelation

Yamamoto, Ryōichi; Kim, Kang; Nakayama, Yasuya; Miyazaki, Kunimasa; Reichman, David R.

doi:10.1143/jpsj.77.084804

Cited by 34 publications

(33 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method has been adapted to rheological studies and studies of the gelation of colloidal particle dispersions; it has been confirmed reasonably well [23,30]. In the present study, we consider the rapid Brownian coagulation process for a system of monodisperse spherical particles in which the particles interact with one another through short-range attractive interactions.…”

Section: Simulation Methodsmentioning

confidence: 74%

“…This method has been adapted to the rheology of colloidal dispersions and sedimentation phenomena in which fluid hydrodynamics significantly affect particle dynamics [20,21]. Although the SD method has provided much valuable information regarding these phenomena, the assumption that HIs can be treated as the sum of two-body interactions fails to consider many-body HIs, which may be important in coagulation of high volume fractions [22,23]. Consequently, to gain a complete understanding of these coagulation processes, it is desirable to consider many-body HIs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of hydrodynamic interactions on rapid Brownian coagulation of colloidal dispersions

et al. 2012

Self Cite

View full text Add to dashboard Cite

The rate of rapid Brownian coagulation is investigated for dispersions of spherical particles with particle volume fractions ranging from Øp = 0.003 to 0.1 by the direct numerical simulation method. This method explicitly considers hydrodynamic interactions (HIs) between particles by simultaneously solving for the motions of the dispersed particles and the host fluid. In the dilute limit, the rate of rapid Brownian coagulation decreases to approximately 0.3-0.5 times the theoretical Smoluchowski rate. We compare this result with results of previously reported experiments and theoretical predictions and find a strong correlation between them. This demonstrates that HIs between particles significantly reduce the coagulation rate. Moreover, the volume fraction dependence of the coagulation rate indicates that the coagulation rate increases with increasing volume fraction. At high particle volume fractions, the initial coagulation stage is affected by heterogeneous coagulation process before the steady state is reached.

show abstract

Section: Simulation Methodsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Effect of hydrodynamic interactions on rapid Brownian coagulation of colloidal dispersions

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, recent studies of aggregation have revealed that the role of hydrodynamic interactions is limited in three-dimensional simulations. 43 Moreover, a comparison between BD and a novel algorithm developed to incorporate hydrodynamic interactions (fast lubrication dynamics, FLD) for colloidal suspensions interacting via short-range attraction and long-range repulsion at comparable volume fractions has demonstrated remarkable agreement for both the microstructure and dynamics. 44 This suggests that the structural and dynamic properties of these types of systems are not very sensitive to the effects of hydrodynamic interactions.…”

Section: Long-time Dynamics: Rheological Measurements Andmentioning

confidence: 99%

Cluster-Driven Dynamical Arrest in Concentrated Lysozyme Solutions

et al. 2011

View full text Add to dashboard Cite

The ability of colloidal particles to form equilibrium cluster phases under conditions where the particles interact via a potential consisting of a soft long-range repulsion and a shortrange attraction is well documented. 1,2 In this class of systems, the short-range attraction drives cluster formation, whereas the increasing long-range repulsion due to the accumulating charge of the clusters limits their size. After an initial report 3 that demonstrated the existence of such clusters in systems as diverse as concentrated lysozyme solutions at low ionic strength and weakly charged colloids in a low dielectric constant solvent with added nonadsorbing polymers (to induce a short-range attraction via a depletion mechanism), cluster phases have been demonstrated to exist in a large range of colloidal systems. 4À8In particular, the finding that equilibrium clusters may form in protein solutions under appropriate solution conditions has attracted considerable attention due to its potential biological significance in areas such as protein crystallization or protein condensation diseases. 9À16The initial evidence of the existence of clusters in concentrated lysozyme solutions at low ionic strength has been obtained from the rather peculiar small-angle X-ray (SAXS) and small-angle neutron scattering (SANS) pattern obtained for these systems, 3,17 where an analysis of the dependence of the scattering intensity as a function of the magnitude of the scattering vector q clearly reveals the existence of two peaks in the static structure factor S(q). Surprisingly, both the low as well as the high-q peak were found to be almost independent of the volume fraction φ at sufficiently high values of φ. This was subsequently interpreted as the signature of the presence of equilibrium clusters, where the low-q peak was attributed to a clusterÀcluster interaction peak and thus denoted q c , while the high-q peak was thought to reflect the monomerÀ monomer correlations within the cluster and thus denoted q m .This interpretation was subsequently challenged by Shukla et al., 18 who also conducted SANS and SAXS experiments with lysozyme solutions at low ionic strength. On the basis of the fact that they saw a clear shift of the cluster peak position at lower protein volume fractions, they questioned the existence of equilibrium clusters in lysozyme solutions. However, it has already been pointed out that for comparable experimental conditions, the claim of Shukla et al. relied in fact on scattering data that showed no significant differences to the earlier data on which the cluster model had been based.19,20 SAXSABSTRACT: We present a detailed experimental and numerical study of the structural and dynamical properties of salt-free lysozyme solutions. In particular, by combining small-angle X-ray scattering (SAXS) data with neutron spin echo (NSE) and rheology experiments, we are able to identify that an arrest transition takes place at intermediate densities, driven by the slowing down of the cluster motion. Using an effective pair pote...

show abstract

“…The transient aggregates observed may evolve to stable low-energy structures [38] or arrested structures [39][40][41][42][43]. But the time scale to which this may occur and the final state of the aggregate is difficult to predict.…”

Section: Discussionmentioning

confidence: 99%