Re-entrant kinetic arrest and elasticity of concentrated suspensions of spherical and nonspherical repulsive and attractive colloids

Kramb, Ryan C.; Zhang, Rui; Schweizer, Kenneth S.; Zukoski, Charles F.
January 2011
Journal of Chemical Physics;1/7/2011, Vol. 134 Issue 1, p014503
Academic Journal
We have designed and studied a new experimental colloidal system to probe how the weak shape anisotropy of uniaxial particles and variable repulsive (Coulombic) and attractive (van der Waals) forces influence slow dynamics, shear elasticity, and kinetic vitrification in dense suspensions. The introduction of shape anisotropy dramatically delays kinetic vitrification and reduces the shear elastic modulus of colloidal diatomics relative to their chemically identical spherical analogs. Tuning the interparticle interaction from repulsive, to nearly hard, to attractive by increasing suspension ionic strength reveals a nonmonotonic re-entrant dynamical phase behavior (glass-fluid-gel) and a rich variation of the shear modulus. The experimental results are quantitatively confronted with recent predictions of ideal mode coupling and activated barrier hopping theories of kinetic arrest and elasticity, and good agreement is generally found with a couple of exceptions. The systems created may have interesting materials science applications such as flowable ultrahigh volume fraction suspensions, or responsive fluids that can be reversibly switched between a flowing liquid and a solid nonequilibrium state based on in situ modification of suspension ionic strength.


Related Articles

  • Spatial-Temporal Correlations at the Onset of Flow in Concentrated Suspensions. Martys, Nicos S.; Lootens, Didier; George, William L.; Satterfield, Steven G.; H├ębraud, Pascal // AIP Conference Proceedings;7/7/2008, Vol. 1027 Issue 1, p207 

    Spatial-temporal correlations in the startup-up flow of colloidal suspensions composed of attractive spherical particles under static and shear conditions are studied by computer simulation. The evolution of particle organization with time is followed as equilibrium is approached. The time...

  • An analytical molecular mechanics model for the elastic properties of crystalline polyethylene. Zhao, Junhua; Guo, Wanlin; Rabczuk, Timon // Journal of Applied Physics;Aug2012, Vol. 112 Issue 3, p033516 

    We present an analytical model to relate the elastic properties of crystalline polyethylene based on a molecular mechanics approach. Along the polymer chains direction, the united-atom (UA) CH2-CH2 bond stretching, angle bending potentials are replaced with equivalent Euler-Bernoulli beams....

  • A molecular-dynamics simulation study of solvent-induced repulsion between C60 fullerenes in water. Liwei Li; Bedrov, Dmitry; Smith, Grant D. // Journal of Chemical Physics;11/22/2005, Vol. 123 Issue 20, p204504 

    Molecular-dynamics simulations of a single C60 fullerene and pairs of C60 fullerenes in aqueous solution have been performed for the purpose of obtaining improved understanding of the nature of solvent-induced interactions between C60 fullerenes in water. Our simulations reveal repulsive...

  • Asymmetric charge patterning on surfaces and interfaces: Formation of hexagonal domains. Loverde, Sharon M.; Olvera de la Cruz, Monica // Journal of Chemical Physics;10/28/2007, Vol. 127 Issue 16, p164707 

    The structure of soft matter systems at interfaces is of utmost importance in the fields of nanopatterning and self-assembly. It has been shown that lamellar and hexagonal patterns can form on interfaces, for a wide variety of systems. The asphericity of charged domains is considered here for...

  • Spatially modulated structures in nematic colloids: Statistical thermodynamics and kinetics. Kleshchonok, A.; Reshetnyak, V.; Tatarenko, V. // European Physical Journal E -- Soft Matter;Mar2011, Vol. 34 Issue 3, p1 

    We examine the spatial distribution of rigid-sphere-like particles in a nematic host. Using a continuum model we analyse the conditions necessary for the appearance of a modulated lamellar structure. There is a long-range effective interaction between the particles, which can lead to the...

  • Experimentally Justified Model-Like Description of Consolidation of Precipitated Silica. Sahabi, Hussein; Kind, Matthias // Polymers (20734360);Dec2011, Vol. 3 Issue 4, p2156 

    Colloidal gels are intermediates in the production of highly porous particle systems. In the production process, the gels are fragmented after their creation. These gel fragments consolidate to particles whose application-technological properties are determined by their size and porosity. A...

  • Dynamics of surface structure evolution in colloidal adsorption: Charge patterning and polydispersity. Brewer, Damien D.; Tsapatsis, Michael; Kumar, Satish // Journal of Chemical Physics;7/21/2010, Vol. 133 Issue 3, p034709 

    Kinetics, surface structures, and extent of surface coverage in adsorption of spherical colloids onto uniform and charge-patterned surfaces are studied using dynamic simulations. A Brownian dynamics simulation methodology is developed to account for double-layer and van der Waals interactions...

  • Diffusiophoretic self-propulsion of colloids driven by a surface reaction: The sub-micron particle regime for exponential and van der Waals interactions. Sharifi-Mood, Nima; Koplik, Joel; Maldarelli, Charles // Physics of Fluids;Jan2013, Vol. 25 Issue 1, p012001 

    Diffusiophoresis is a mechanism for propelling colloid particles in a liquid in which the driving force for the motion derives from intermolecular interactions between solute molecules surrounding the particle and the colloid itself. When solutes are asymmetrically distributed around the...

  • Finite element simulation for estimating the mechanical properties of multi-walled carbon nanotubes. Fan, C. W.; Liu, Y. Y.; Hwu, Chyanbin // Applied Physics A: Materials Science & Processing;Jun2009, Vol. 95 Issue 3, p819 

    A finite element simulation technique for estimating the mechanical properties of multi-walled carbon nanotubes is developed. In the present modeling concept, individual carbon nanotube is simulated as a frame-like structure and the primary bonds between two nearest-neighboring atoms are treated...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics