Controlling anomalous stresses in soft field-responsive systems
We report a phenomenon occurring in field-responsive suspensions: shear-induced anomalous stresses. Competition between a rotating field and a shear flow originates a multiplicity of anomalous stress behaviors in suspensions of bound dimers constituted by induced dipoles. The great variety of stress regimes includes nonmonotonic behaviors, multiresonances, negative viscosity effect, and blockades. The reversibility of the transitions between the different regimes and the self-similarity of the stresses make this phenomenon controllable and therefore applicable to modify macroscopic properties of soft condensed matter phases.
Reguera
D
Departament de Fisica Fonamental-CER on Physics of Complex Systems, Facultat de Fisica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.
Rubi
JM
Perez-Madrid
A