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- Wiley-Blackwell Publishing, Inc
- Universidade de Aveiro
- Sociedade Brasileira de Física
- Programa de P?s-Gradua??o em Engenharia de Materiais. Rede Tem?tica em Engenharia de Materiais, Pr?-Reitoria de Pesquisa e P?s-Gradua??o, Universidade Federal de Ouro Preto.
- Croatian Chemical Society
- AMER INST PHYSICS
- The Rockefeller University Press
- American Chemical Society
- Universidade Cornell
- Instituto de Tecnologia da Califórnia
- American Institute of Physics
- Mais Publicadores...

## RHEOLOGICAL CHARACTERIZATION of SUSPENSIONS of SUCROSE CRYSTALS IN SATURATED SUCROSE SOLUTIONS

Fonte: Wiley-Blackwell Publishing, Inc
Publicador: Wiley-Blackwell Publishing, Inc

Tipo: Conferência ou Objeto de Conferência
Formato: 992-1009

ENG

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 02/06838-1; Processo FAPESP: 03/05802-6; Processo FAPESP: 04/12620-4; Suspensions formed by saturated sucrose solutions were analyzed at different temperatures (0 <= T <= 65C) and with different added fractions (0.005 <= phi <= 0.40) of known size sucrose crystals (0.163 <= d(p) <= 1.26 mm). Saturated sucrose solutions, taken as the suspension dispersant mean, were rheologically characterized using a concentric-cylinder rheometer and showed Newtonian behavior. The crystal suspensions were rheologically evaluated by using a mixer-type rheometer constituting an anchor impeller coupled to a rotational rheometer, also known as a mixer-type rheometer. The studied crystal suspensions also showed Newtonian behavior. Theoretical and semiempirical models were used to describe the correlation between suspension relative viscosity and crystal volumetric fraction. The best results were obtained using the Krieger and Dougherty, and the Mooney model, resulting in values of intrinsic viscosity, (eta), and maximum packing fraction, phi(m), compatible with data reported for coarse concentrated suspensions of nonspherical particles.

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## Microagulhas cerâmicas para libertação controlada de fármacos

Fonte: Universidade de Aveiro
Publicador: Universidade de Aveiro

Tipo: Dissertação de Mestrado

POR

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#Engenharia de materiais#Materiais cerâmicos - Aplicações em medicina#Sistemas de administração de fármacos#Resinas epoxídicas#Suspensões coloidais - Gelificação#Microagulhas#Microfabricação#Epoxy gel casting#Suspensões aquosas#Alumina#Zircónia

O principal objectivo da presente dissertação é desenvolver microagulhas cerâmicas para administração transdérmica de fármacos à base de alumina-zircónia consolidadas por uma nova técnica denominada epoxy gel casting a partir de suspensões aquosas concentradas. Para o efeito estudaram-se as várias fases do processo, incluindo (i) preparação e caracterização de suspensões aquosas concentradas na presença de agentes de gelificação (resina e endurecedor), (ii) consolidação directa de suspensões por epoxy gel casting; (iii) caracterização das amostras em verde e sinterizadas; (iv) produção de micromoldes à base de silicone a partir de uma madre polimérica de microagulhas e, finalmente, (v) enchimento dos micromoldes e caracterização microestrutural das microagulhas cerâmicas em verde e sinterizadas.
Os métodos de consolidação directa, como o epoxy gel casting, requerem o uso de suspensões concentradas de forma a maximizar a densidade dos corpos em verde e minimizar a retracção durante os processos de secagem e sinterização. Assim, numa primeira fase do trabalho prepararam-se suspensões concentradas em meio aquoso à base de alumina, zircónia e mistura dos dois materiais. Foram estudadas diferentes quantidades de resina (10...

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## Osmotic stress on concentrated colloidal suspensions: a path towards equilibrium?

Fonte: Sociedade Brasileira de Física
Publicador: Sociedade Brasileira de Física

Tipo: Artigo de Revista Científica
Formato: text/html

Publicado em 01/04/2009
EN

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We discuss in this study the advantages and limitations of the osmotic stress method that enables to set the osmotic pressure to a given system. By investigating aqueous suspension of monodisperse silica nanoparticles of radius 78 at an ionic strength of 10-2 mol/L, we show that the method is very accurate to probe the phase behavior of colloidal suspensions because it allows to prepare samples all along the equation of state of the system at constant ionic strength without any aggregation and with a well defined structure, as shown by Small-Angle Neutron Scattering (SANS) experiments. However the method fails to yield crystalline structures, since solid samples obtained are always glassy, even when the fluid-solid transition is crossed with small successive jumps of 1000 Pa. This phenomenon comes from the kinetics of the process which exhibits in our experimental conditions an exponential decay time with a characteristic time of ≈ 3 hours that induces a very strong change of the volume fraction of the suspension in the early stages of the stress. When the jump of pressure is very important, the system is frozen in the vicinity of the dialysis bag and forms a dense shell that eventually prevents some spatial regions of the sample to reach equilibrium. In this case...

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## Reologia e microestrutura na estabiliza??o de suspens?es concentradas de Al2O3.

Fonte: Programa de P?s-Gradua??o em Engenharia de Materiais. Rede Tem?tica em Engenharia de Materiais, Pr?-Reitoria de Pesquisa e P?s-Gradua??o, Universidade Federal de Ouro Preto.
Publicador: Programa de P?s-Gradua??o em Engenharia de Materiais. Rede Tem?tica em Engenharia de Materiais, Pr?-Reitoria de Pesquisa e P?s-Gradua??o, Universidade Federal de Ouro Preto.

Tipo: Dissertação

PT_BR

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#Reologia#Viscosidade#Suspens?es#Folhas cer?micas#Estabiliza??o - suspens?es#Ligas#Pontecial Zeta#Barbotina#Alum?nio

Produtos cer?micos provenientes de suspens?es concentradas de Al2O3necessitam que as mesmas sejam estabilizadas para que possam atender ?s crescentes exig?ncias de performance. As suspens?es estudadas neste trabalho s?o, usualmente, empregadas na obten??o de folhas cer?micas pelo processo de colagem de folhas cer?micas (Tape Casting). Part?culas, quando em suspens?o, desenvolvem cargas superficiais. Quando estas part?culas entram em choque umas com as outras pode acontecer o fen?meno da agrega??o, gerando estruturas floculadas que aprisionam ?gua em seu interior, o que resultaria num produto final poroso e conseq?entemente de baixa resist?ncia mec?nica e at? mesmo qu?mica. Estabilizar uma suspens?o concentrada ? fazer com que a resultante entre as for?as atrativas de van der Waals e as for?as repulsivas, entre duplas camadas el?tricas igualmente carregadas ou decorrentes da adi??ode material polim?rico na superf?cie das part?culas, seja repulsiva. Os par?metros de avalia??o da estabilidade das suspens?es concentradas de Al2O3, aqui utilizados, foram o potencial zeta e a viscosidade. Foram, tamb?m, propostos novos par?metros, a saber: 1) estruturas milim?tricas, 2) microestruturas e 3) histerese nas curvas de viscosidades. Neste trabalho foram feitas suspens?es concentradas de Al2O3que variavam de 40% a 70%...

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## Electroacoustic characterization of bidisperse suspensions

Fonte: Croatian Chemical Society
Publicador: Croatian Chemical Society

Tipo: Artigo de Revista Científica

ENG

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Electroacoustic techniques are promising tools for the size determination and electrokinetic
characterization of concentrated colloidal suspensions. When particles are not homogeneous in
size and/or density, the dynamic mobility obtained is a kind of average of the mobilities of
every particle. In this paper, we try to discern which averaging procedure provides a better
description of the dynamic mobility of bidisperse suspensions consisting of a mixture of two
very different types of particles. The results show that the amplitude of the sound wave induced
by an applied ac field (electrokinetic sonic amplitude) is not just the sum of the amplitudes
of the waves generated by every particle but has a larger contribution from the larger particles,
although the small size entities considerably influence the behaviour of the latter because of
their interference in the fluxes of the fluid and ions around them.

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## Dynamic transitions in a three dimensional associating lattice gas model

Fonte: AMER INST PHYSICS
Publicador: AMER INST PHYSICS

Tipo: Artigo de Revista Científica

ENG

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#aggregation#Brownian motion#colloids#reaction kinetics theory#shear flow#soft matter#suspensions#LIQUID PHASE-TRANSITION#WATER#ANOMALIES#POLYAMORPHISM

The aggregation of interacting Brownian particles in sheared concentrated suspensions is an important issue in colloid and soft matter science per se. Also, it serves as a model to understand biochemical reactions occurring in vivo where both crowding and shear play an important role. We present an effective medium approach within the Smoluchowski equation with shear which allows one to calculate the encounter kinetics through a potential barrier under shear at arbitrary colloid concentrations. Experiments on a model colloidal system in simple shear flow support the validity of the model in the concentration range considered. By generalizing Kramers' rate theory to the presence of shear and collective hydrodynamics, our model explains the significant increase in the shear-induced reaction-limited aggregation kinetics upon increasing the colloid concentration.; CNPq; INCT-FCx

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## The Microrheology of Red Blood Cell Suspensions

Fonte: The Rockefeller University Press
Publicador: The Rockefeller University Press

Tipo: Artigo de Revista Científica

Publicado em 01/07/1968
EN

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The general problem of microrheology is to predict the macroscopic flow properties of a material from a detailed description of the behavior of its constituent elements. This approach has been used to study suspensions of human red cells in plasma or Ringer's solution flowing steadily in rigid tubes 8–25 times the red cell diameter by observing individual cell motions under the microscope. The results have been compared with those previously obtained with model particles under similar conditions. In very dilute suspensions single red cells rotated in orbits similar to those of rigid discs at low flow rates, but, in common with model deformable particles, were observed to migrate away from the tube wall. Linear rouleaux of red cells rotated as rodlike particles and were flexible, bending during their rotational orbits in a manner similar to that of filaments of nylon or Dacron. Transparent concentrated suspensions were produced by preparing ghost cells reconstituted in biconcave form in plasma. In these, the motions of some unhemolyzed red cells were followed. The erythrocyte velocity profiles were blunted at concentrations above 20%; the cell paths were erratic because of frequent radial displacements, especially at the tube periphery...

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## Highly concentrated aqueous suspensions of graphene through ultrasonic exfoliation with continuous surfactant addition

Fonte: American Chemical Society
Publicador: American Chemical Society

Tipo: Artigo de Revista Científica

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Highly concentrated suspensions of graphene stabilized with surfactant were prepared using ultrasonic exfoliation. Concentrations of up to 1.5% w/w (15 mg/mL) were achieved through the continuous addition of the surfactant during the exfoliation process.

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## A Mean Field Model of Layering Instability in Shearing Suspensions

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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Concentrated suspensions may shear-thin when the suspended particles form
planar sheets that slide over one another with less friction than if the
particles are randomly distributed. In a na\"ive model the suspension is
described by a mean effective viscosity, and particles that collide with each
other redistribute the mean density in the shearing direction. This leads to a
diffusion equation for the particle density. If the viscosity in the unthinned
state is a steeply increasing function of particle density the effective
diffusion coefficient is negative and the diffusion equation, meaningful only
on scales larger than the particle separation, is ill-posed. This singularity
corresponds to the formation of planar sheets of particles and defines a
critical particle density for the onset of shear thinning.; Comment: 7 pp, 1 fig As published; revised in response to referees' comments

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## Viscoelasticity and shear flow of concentrated, non-crystallizing colloidal suspensions: Comparison with Mode-Coupling Theory

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 20/10/2008

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We present a comprehensive rheological study of a suspension of
thermosensitive particles dispersed in water. The volume fraction of these
particles can be adjusted by the temperature of the system in a continuous
fashion. Due to the finite polydispersity of the particles (standard deviation:
17%), crystallization is suppressed and no fluid-crystal transition intervenes.
Hence, the moduli $G'$ and $G"$ in the linear viscoelastic regime as well as
the flow curves (shear stress $\sigma(\dot{\gamma})$ as the function of the
shear rate $\dot{\gamma}$) could be measured in the fluid region up to the
vicinity of the glass transition. Moreover, flow curves could be obtained over
a range of shear rates of 8 orders of magnitude while $G'$ and $G"$ could be
measured spanning over 9 orders of magnitude. Special emphasis has been laid on
precise measurements down to the smallest shear rates/frequencies. It is
demonstrated that mode-coupling theory generalized in the integration through
transients framework provides a full description of the flow curves as well as
the viscoelastic behavior of concentrated suspensions with a single set of
well-defined parameters.

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## Ion size effects on the electrokinetics of salt-free concentrated suspensions in ac fields

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We analyze the influence of finite ion size effects in the response of a
salt-free concentrated suspension of spherical particles to an oscillating
electric field. Salt-free suspensions are just composed of charged colloidal
particles and the added counterions released by the particles to the solution,
that counterbalance their surface charge. In the frequency domain, we study the
dynamic electrophoretic mobility of the particles and the dielectric response
of the suspension. We find that the Maxwell-Wagner-O'Konski process associated
with the counterions condensation layer, is enhanced for moderate to high
particle charges, yielding an increment of the mobility for such frequencies.
We also find that the increment of the mobility grows with ion size and
particle charge. All these facts show the importance of including ion size
effects in any extension attempting to improve standard electrokinetic models.; Comment: J. Colloid Interface Sci., in press, 13 pages, 9 figures

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## The rheology of concentrated suspensions of arbitrarily-shaped particles

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 31/05/2010

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We propose an improved effective-medium theory to obtain the concentration
dependence of the viscosity of particle suspensions at arbitrary volume
fractions. Our methodology can be applied, in principle, to any particle shape
as long as the intrinsic viscosity is known in the dilute limit and the
particles are not too elongated. The procedure allows to construct a
continuum-medium model in which correlations between the particles are
introduced through an effective volume fraction. We have tested the procedure
using spheres, ellipsoids, cylinders, dumbells, and other complex shapes. In
the case of hard spherical particles, our expression improves considerably
previous models like the widely used Krieger-Dougherty relation. The final
expressions obtained for the viscosity scale with the effective volume fraction
and show remarkable agreement with experiments and numerical simulations at a
large variety of situations.; Comment: 28 pages, 7 figures

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## High-volume fraction simulations of two-dimensional vesicle suspensions

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We consider numerical algorithms for the simulation of the rheology of
two-dimensional vesicles suspended in a viscous Stokesian fluid. The vesicle
evolution dynamics is governed by hydrodynamic and elastic forces. The elastic
forces are due to local inextensibility of the vesicle membrane and resistance
to bending. Numerically resolving vesicle flows poses several challenges. For
example, we need to resolve moving interfaces, address stiffness due to
bending, enforce the inextensibility constraint, and efficiently compute the
(non-negligible) long-range hydrodynamic interactions.
Our method is based on the work of {\em Rahimian, Veerapaneni, and Biros,
"Dynamic simulation of locally inextensible vesicles suspended in an arbitrary
two-dimensional domain, a boundary integral method", Journal of Computational
Physics, 229 (18), 2010}. It is a boundary integral formulation of the Stokes
equations coupled to the interface mass continuity and force balance. We extend
the algorithms presented in that paper to increase the robustness of the method
and enable simulations with concentrated suspensions.
In particular, we propose a scheme in which both intra-vesicle and
inter-vesicle interactions are treated semi-implicitly. In addition we use
special integration for near-singular integrals and we introduce a spectrally
accurate collision detection scheme. We test the proposed methodologies on both
unconfined and confined flows for vesicles whose internal fluid may have a
viscosity contrast with the bulk medium. Our experiments demonstrate the
importance of treating both intra-vesicle and inter-vesicle interactions
accurately.

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## Long-lived and unstable modes of Brownian suspensions in microchannels

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 12/04/2012

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We investigate the stability of the pressure-driven, low-Reynolds flow of
Brownian suspensions with spherical particles in microchannels. We find two
general families of stable/unstable modes: (i) degenerate modes with symmetric
and anti-symmetric patterns; (ii) single modes that are either symmetric or
anti-symmetric. The concentration profiles of degenerate modes have strong
peaks near the channel walls, while single modes diminish there. Once excited,
both families would be detectable through high-speed imaging. We find that
unstable modes occur in concentrated suspensions whose velocity profiles are
sufficiently flattened near the channel centreline. The patterns of growing
unstable modes suggest that they are triggered due to Brownian migration of
particles between the central bulk that moves with an almost constant velocity,
and highly-sheared low-velocity region near the wall. Modes are amplified
because shear-induced diffusion cannot efficiently disperse particles from the
cavities of the perturbed velocity field.; Comment: 11 pages, accepted for publication in Journal of Fluid Mechanics

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## Dynamics of suspensions of hydrodynamically structured particles: Analytic theory and experiment

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 12/01/2015

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We present an easy-to-use analytic toolbox for the calculation of short-time
transport properties of concentrated suspensions of spherical colloidal
particles with internal hydrodynamic structure, and direct interactions
described by a hard-core or soft Hertz pair potential. The considered dynamic
properties include self-diffusion and sedimentation coefficients, the
wavenumber-dependent diffusion function determined in dynamic scattering
experiments, and the high-frequency shear viscosity. The toolbox is based on
the hydrodynamic radius model (HRM) wherein the internal particle structure is
mapped on a hydrodynamic radius parameter for unchanged direct interactions,
and on an existing simulation data base for solvent-permeable and spherical
annulus particles. Useful scaling relations for the diffusion function and
self-diffusion coefficient, known to be valid for hard-core interaction, are
shown to apply also for soft pair potentials. We further discuss extensions of
the toolbox to long-time transport properties including the low-shear
zero-frequency viscosity and the long-time self-diffusion coefficient. The
versatility of the toolbox is demonstrated by the analysis of a previous light
scattering study of suspensions of non-ionic PNiPAM microgels [Eckert et al....

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## Shear thickening in granular suspensions: inter-particle friction and dynamically correlated clusters

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We consider the shear rheology of concentrated suspensions of non-Brownian
frictional particles. The key result of our study is the emergence of a
pronounced shear-thickening regime, where frictionless particles would normally
undergo shear-thinning. We clarify that shear thickening in our simulations is
due to enhanced energy dissipation via frictional inter-particle forces.
Moreover, we evidence the formation of dynamically correlated particle-clusters
of size $\xi$, which contribute to shear thickening via an increase in
\emph{viscous} dissipation. A scaling argument gives $\eta\sim \xi^2$, which is
in very good agreement with the data.

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## Void structure and cage dynamics in concentrated suspensions

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 18/11/2005

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#Condensed Matter - Soft Condensed Matter#Condensed Matter - Disordered Systems and Neural Networks#Condensed Matter - Materials Science

We analyse structure and dynamics in simulated high-concentration hard sphere
colloidal suspensions by means of calculations based on the void space. We show
that remoteness, a quantity measuring the scale of spaces, is useful in
studying crystallization, since ordering of the particles involves a change in
the way empty space is distributed. Calculation of remoteness also allows
breakdown of the system into mesoscopic neighbor sets: statistics of mean
remoteness and local volume fraction in these neighbor sets reveal that nuclei
are formed at locally higher concentration, i.e. nucleation involves increased
heterogeneity of the system. Full crystallization results in the transformation
of the neighbor set mean remoteness distribution to an exponential form. The
temporal fluctuation of local volume fractions in neighbor sets reveals
significant details of dynamics, including abrupt dilations and compressions of
local regions: leading to a clearer picture of the physical components of
'cage' dynamics in the colloidal glass.; Comment: 16 pages, 8 figs

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## Fictitious Fluid Approach and Anomalous Blow-up of the Dissipation Rate in a 2D Model of Concentrated Suspensions

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 27/08/2006

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We present a two-dimensional (2D) mathematical model of a highly concentrated
suspension or a thin film of the rigid inclusions in an incompressible
Newtonian fluid. Our objectives are two-fold: (i) to obtain all singular terms
in the asymptotics of the overall viscous dissipation rate as the interparticle
distance parameter $\delta$ tends to zero, (ii) to obtain a qualitative
description of a microflow between neighboring inclusions in the suspension.; Comment: 76 pages, submitted

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## The non-Newtonian rheology of dilute colloidal suspensions

Fonte: Instituto de Tecnologia da Califórnia
Publicador: Instituto de Tecnologia da Califórnia

Tipo: Article; PeerReviewed
Formato: application/pdf

Publicado em 10/04/2002

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The non-Newtonian rheology is calculated numerically to second order in the volume fraction in steady simple shear flows for Brownian hard spheres in the presence of hydrodynamic and excluded volume interactions. Previous analytical and numerical results for the low-shear structure and rheology are confirmed, demonstrating that the viscosity shear thins proportional to Pe2, where Pe is the dimensionless shear rate or Péclet number, owing to the decreasing contribution of Brownian forces to the viscosity. In the large Pe limit, remnants of Brownian diffusion balance convection in a boundary-layer in the compressive region of the flow. In consequence, the viscosity shear thickens when this boundary-layer coincides with the near-contact lubrication regime of the hydrodynamic interaction. Wakes are formed at large Pe in the extensional zone downstream from the reference particle, leading to broken symmetry in the pair correlation function. As a result of this asymmetry and that in the boundary-layer, finite normal stress differences are obtained as well as positive departures in the generalized osmotic pressure from its equilibrium value. The first normal stress difference changes from positive to negative values as Pe is increased when the hard-sphere limit is approached. This unusual effect is caused by the hydrodynamic lubrication forces that maintain particles in close proximity well into the extensional quadrant of the flow. The study demonstrates that many of the non-Newtonian effects observed in concentrated suspensions by experiments and by Stokesian dynamics simulations are present also in dilute suspensions.

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## Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering

Fonte: American Institute of Physics
Publicador: American Institute of Physics

Tipo: Article; PeerReviewed
Formato: application/pdf

Publicado em 28/10/2013

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Evanescent wave dynamic light scattering and Stokesian dynamics simulations were employed to study the dynamics of hard-sphere colloidal particles near a hard wall in concentrated suspensions. The evanescent wave averaged short-time diffusion coefficients were determined from experimental correlation functions over a range of scattering wave vectors and penetration depths. Stokesian dynamics simulations performed for similar conditions allow a direct comparison of both the short-time self- and collective diffusivity. As seen earlier [V. N. Michailidou, G. Petekidis, J. W. Swan, and J. F. Brady, Phys. Rev. Lett.102, 068302 (2009)] while the near wall dynamics in the dilute regime slow down compared to the free bulk diffusion, the reduction is negligible at higher volume fractions due to an interplay between the particle-wall and particle-particle hydrodynamic interactions. Here, we provide a comprehensive comparison between experiments and simulations and discuss the interplay of particle-wall and particle-particle hydrodynamics in the self- and cooperative dynamics determined at different scattering wave vectors and penetration depths.

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