Deformation, melting, and relaxation of structured colloidal dispersions

Control of Gel Morphology and Properties of a Class of Metallo-Supramolecular Polymers by Good/Poor Solvent Environments

“…The high equilibrium modulus, narrow linear viscoelastic regime, and small strain at which onset of viscous flow occurs exemplify that this transparent gel is very strong, but brittle. Similar behavior has been documented in a variety of colloidal gel systems. − …”

“…Similar behavior has been documented in a variety of colloidal gel systems. [20][21][22][23] In a thixotropic material, when subjected to shear deformation, one expects a competition between bond breaking, which occurs as a consequence of the action of shear forces, and bond formation, which occurs on account of convective collisions between separated elements. 24,25 The initial increase of G′′ with strain in the low strain range, evident in Figure 10, is thus attributed to breakdown of agglomerates into smaller-sized units, resulting in a more dissipative system.…”

A colloidal crystal modeled by bead–spring cubes

“…The experimental results obtained so far can be sum-marized as follows: ͑i͒ GЈ() is constant and GЉ() ϭ ϱ for տ300 rad s Ϫ1 ͑the dynamical viscosity ϱ is much smaller than the steady shear viscosity of the colloidal crystal͒, 55-66 ͑ii͒ both GЈ() and GЉ() are constant for 0.3 rad s Ϫ1 ՇՇ300 rad s Ϫ1 ͓since GЈ()ӷGЉ() the experimental inaccuracy to determine GЉ() is rather high; consequently, although GЉ() appears to be constant in these measurements, its exact frequency dependency is not known yet͔, 20,[31][32][33][42][43][44][45][46]55,[64][65][66][67][68][69][70] and ͑iii͒ GЈ() is still constant and GЉ() is proportional to Ϫ1/2 for Շ0.3 rad s Ϫ1 ͑more experiments are needed to demonstrate that the frequency dependency Ϫ1/2 is generally valid͒. 46,55,64 Up to now, many researchers have tried to find an expression for the frequency independent GЈ(), [61][62][63][64][71][72][73][74][75][76][77][78] but, to our knowledge, no paper exists in which a theoretical model is given that explains the clear transition in the frequency behavior of GЉ().…”

Stability of Suspensions of Charged Colloids

“…Colloids resulting from the dispersion of charged particles are used in many industrial applications. They have been the subject of numerous experimental − and theoretical − studies. A central question concerns the relevance of statistical physics, which has successfully modeled molecular systems, to explain the behavior of colloids implicating much larger objects.…”