CNCS Seminar
Tuesday, September 27, 2016, 3:00pm, 119 Physics
Lilian Hsiao (North Carolina State University)
Colloids with tunable geometry and their effects on viscoelastic materials and suspensions
Abstract:- A central challenge in soft matter and materials science is the
microscopic engineering of functional materials. Incorporating
anisotropy here is of general interest, for example in actin networks,
clay platelets, and polymer nanocomposites where geometry, ordering,
and kinetics all play important roles in determining their
properties. Nevertheless, forming a general connection between
microstructure and macroscopic properties is not trivial. Here, I
focus on the self-assembly and mechanics of colloidal materials with
an emphasis on how shape anisotropy and interaction potential can be
used to guide their design. I will first discuss the relevance of the
physical interactions that give rise to a general class of colloidal
gels, followed by how shape anisotropy can introduce metastable gelled
states. I will also show that the slowed rotational dynamics caused by
surface roughness and friction can lead to enhanced shear thickening
that is not seen with smooth colloids. These results collectively show
that particle-level interactions provide a powerful means to design
soft materials at multiple length scales. [video]
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