34 research outputs found
Interaction between like-charged polyelectrolyte-colloid complexes in electrolyte solutions: a Monte Carlo simulation study in the Debye-H\"uckel approximation
We study the effective interaction between differently charged
polyelectrolyte-colloid complexes in electrolyte solutions via Monte Carlo
simulations. These complexes are formed when short and flexible polyelectrolyte
chains adsorb onto oppositely charged colloidal spheres, dispersed in an
electrolyte solution. In our simulations the bending energy between adjacent
monomers is small compared to the electrostatic energy, and the chains, once
adsorbed, do not exchange with the solution, although they rearrange on the
particles surface to accomodate further adsorbing chains or due to the
electrostatic interaction with neighbor complexes. Rather unexpectedly, when
two interacting particles approach each others, the rearrangement of the
surface charge distribution invariably produces anti-parallel dipolar doublets,
that invert their orientation at the isoelectric point. These findings clearly
rule out a contribution of dipole-dipole interactions to the observed
attractive interaction between the complexes, pointing out that such
suspensions can not be considered dipolar fluids. On varying the ionic strength
of the electrolyte, we find that a screening length, short compared with the
size of the colloidal particles, is required in order to observe the attraction
between like charged complexes due to the non-uniform distribution of the
electric charge on their surface ('patch attraction'). On the other hand, by
changing the polyelectrolyte/particle charge ratio, the interaction between
like-charged polyelectrolyte-decorated (pd) particles, at short separations,
evolves from purely repulsive to strongly attractive. Hence, the effective
interaction between the complexes is characterized by a potential barrier,
whose height depends on the net charge and on the non-uniformity of their
surface charge distribution.Comment: 24 pages, 9 figure
Transition from confined to bulk dynamics in symmetric star-linear polymer mixtures
We report on the linear viscoelastic properties of mixtures comprising
multiarm star (as model soft colloids) and long linear chain homopolymers in a
good solvent. In contrast to earlier works, we investigated symmetric mixtures
(with a size ratio of 1) and showed that the polymeric and colloidal responses
can be decoupled. The adopted experimental protocol involved probing the linear
chain dynamics in different star environments. To this end, we studied mixtures
with different star mass fraction, which was kept constant while linear chains
were added and their entanglement plateau modulus () and terminal
relaxation time () were measured as functions of their concentration.
Two distinct scaling regimes were observed for both and : at low
linear polymer concentrations, a weak concentration dependence was observed,
that became even weaker as the fraction of stars in the mixtures increased into
the star glassy regime. On the other hand, at higher linear polymer
concentrations, the classical entangled polymer scaling was recovered. Simple
scaling arguments show that the threshold crossover concentration between the
two regimes corresponds to the maximum osmotic star compression and signals the
transition from confined to bulk dynamics. These results provide the needed
ingredients to complete the state diagram of soft colloid-polymer mixtures and
investigate their dynamics at large polymer-colloid size ratios. They also
offer an alternative way to explore aspects of the colloidal glass transition
and the polymer dynamics in confinement. Finally, they provide a new avenue to
tailor the rheology of soft composites.Comment: 9 Figure
On the effect of temperature on the reentrant condensation in polyelectrolyte-liposome complexation
In systems of highly charged linear polyelectrolytes and oppositely charged
colloidal particles, long-lived clusters of polyelectrolyte-decorated particles
form in an interval of concentrations around the isoelectric point, where
reentrant condensation connected to charge inversion of cluster is observed.
The mechanisms that drive the aggregation and stabilize, at the different
polymer/particle ratios, a well defined size of the aggregates are not
completely understood. Moreover, a central question still remains unanswered,
i.e., whether the clusters are true equilibrium or metastable aggregates. To
elucidate this point, in this work, we have investigated the effect of the
temperature on the formation of the clusters. We employed liposomes built up by
DOTAP lipid interacting with a simple anionic polyion, sodium polyacrylate,
over an extended concentration range below and over the isoelectric condition.
Our results show that the aggregation process can be described by a
thermally-activated mechanism.Comment: Submitted Langmui
Gelation and Re-entrance in Mixtures of Soft Colloids and Linear Polymers of Equal Size
Liquid mixtures composed of colloidal particles and much smaller
non-adsorbing linear homopolymers can undergo a gelation transition due to
polymer-mediated depletion forces. We now show that the addition of linear
polymers to suspensions of soft colloids having the same hydrodynamic size
yields a liquid-to-gel-to-re-entrant liquid transition. In particular, the
dynamic state diagram of 1,4-polybutadiene star-linear polymer mixtures was
determined with the help of linear viscoelastic and small angle X-ray
scattering experiments. While keeping the star polymers below their nominal
overlap concentration, a gel was formed upon increasing the linear polymer
content. Further addition of linear chains yielded a re-entrant liquid. This
unexpected behavior was rationalized by the interplay of three possible
phenomena: (i) depletion interactions, driven by the size disparity between the
stars and the polymer length scale which is the mesh size of this entanglement
network; (ii) colloidal deswelling due to the increased osmotic pressure
exerted onto the stars; and (iii) a concomitant progressive suppression of
depletion efficiency on increasing polymer concentration due to reduced mesh
size, hence a smaller range of attraction. Our results unveil an exciting new
way to tailor the flow of soft colloids and highlight a largely unexplored path
to engineer soft colloidal mixtures.Comment: 27 pages, 5 figure
Asymmetric soft-hard colloidal mixtures: osmotic effects, glassy states and rheology
The following article has been accepted by Journal of Rheology. After it is published, it will be found at http://sor.scitation.org/journal/jorWhereas mixtures of colloids and non-adsorbing polymers have been studied in great detail in the last two decades, binary colloidal mixtures have not received much attention. Yet, fragmental evidence from asymmetric mixtures of hard spheres indicates a wide-ranging, complex behavior from liquid to crystal to single glass and to double glass, and respective rich rheology. Recently, we addressed the question of softness by investigating a mixture of soft and virtually hard colloidal spheres. We found an unprecedented wealth of states including repulsive single glass (RG), liquid, arrested phase separation (APS) and double glass (DG). This is a consequence of the coupling of softness and osmotic forces due to the hard component. We now report on the rheology of the different states with emphasis on the nonlinear response during start-up of stress at constant rate, its relaxation upon flow cessation, and large amplitude oscillatory shearing. Distinct features are identified, whereas comparison with single-colloid (soft or hard) glasses reveals some phenomenological universalities in yielding, residual stresses and periodic intra-cycle stress response. In brief, the DG exhibits much larger yield and residual stresses as compared to the RG and APS, whereas the yield strain is the same for all states. Two-step yielding is unambiguously evidenced for the APS whereas both yield stress and strain exhibit a weak dependence on PĂ©clet number. Large amplitude oscillatory tests reveal large value of the intrinsic nonlinear parameters, reflecting the role of colloidal interactions. Moreover, RG exhibits intra-cycle stress overshoots, a feature that characterizes most of the soft glassy materials formed by interpenetrable particles and that vanishes as hard (nearly impenetrable) colloids are added in the mixtures. These results demonstrate the sensitivity of linear and nonlinear rheology to colloidal state transitions and, more importantly, the power of entropic mixing as a means to tailor the flow properties, hence performance and handling of soft composites.EU FP7 Infrastructure ESMI || GA262348
ITN SOMATAI || GA316866
Horizon 2020 COLLDENSE || GA642774
Natural Science and Engineering Research Council of Canada (NSERC
Kinetic Arrest in Polyion-Induced Inhomogeneously-Charged Colloidal Particle Aggregation
Polymer chains adsorbed onto oppositely charged spherical colloidal particles
can significantly modify the particle-particle interactions. For sufficient
amounts of added polymers, the original electrostatic repulsion can even turn
into an effective attraction and relatively large kinetically stable aggregates
can form which display several unexpected and interesting peculiarities and
some intriguing biotechnological implications. The attractive interaction
contribution between two oppositely particles arises from the correlated
adsorption of polyions at the oppositely charged particle surfaces, resulting
in a non-homogeneous surface charge distribution. Here, we investigate the
aggregation kinetics of polyion-induced colloidal complexes through Monte Carlo
simulation, in which the effect of charge anisotropy is taken into account by a
DLVO-like intra-particle potential, as recentely proposed by Velegol and Thwar
[D. Velegol and P.K. Thwar, Langmuir, 17, 2001]. The results reveal that in the
presence of a charge heterogeneity the aggregation process slows down due to
the progressive increase of the potential barrier height upon clustering.
Within this framework, the experimentally observed cluster phases in
polyelectrolyte-liposomes solutions should be considered as a kinetic arrested
state.Comment: 9 pages. 11 figure
Hydrogen bond network relaxation in aqueous polyelectrolyte solutions: the effect of temperature
Dielectric spectroscopy data over the range 100 MHz–40 GHz allow for a reliable analysis of two of the major relaxation phenomena for polyelectrolytes (PE) in water. Within this range, the dielectric relaxation of pure water is dominated by a near-Debye process at D 18:5 GHz corresponding to a relaxation time of D 8:4 ps at 25 C. This mode is commonly attributed to the cooperative relaxation specific to liquids forming a hydrogen bond network (HBN) and arising from long range H-bond-mediated dipole–dipole interactions. The presence of charged polymers in water partially modifies the dielectric characteristics of the orientational water molecule relaxation due to a change of the dielectric constant of water surrounding the charges on the polyion chain. We report experimental results on the effect of the presence of a standard flexible polyelectrolyte (sodium polyacrylate) on the HBN relaxation in water for different temperatures, showing that the HBN relaxation time does not change by increasing the polyelectrolyte density in water, even if relatively high concentrations are reached (0:02 monomol C 0:4 monomol ). We also find that the effect of PE addition on the HBN relaxation is not even a broadening of its distribution, rather a decrease of the spectral weight that goes beyond the pure volume fraction effect. This extra decrease is larger at low T and less evident at high T, supporting the idea that the correlation length of the water is less affected by the presence of charged flexible chains at high temperatures