Viscoelasticity of Dynamically Self-Assembled Paramagnetic Colloidal Clusters

by: Pietro Tierno, Ramanathan Muruganathan, Thomas M Fischer

Physical Review Letters, Vol. 98, No. 2. (2007)

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Abstract

Paramagnetic particles in a liquid above a solid dynamically self-assemble into two-dimensional (2D) viscoelastic clusters in a precessing magnetic field if the precession angle exceeds the magic angle. Hexagonal clusters rotate with a frequency proportional to the precession frequency of the magnetic field. The rotation is explained by viscoelastic shear waves excited in the clusters that can be visualized slightly above the magic angle. The cluster rotation and the visualization of viscoelastic modes are independent techniques to probe the rheological properties of the cluster. We find agreement between both techniques when determining the 2D cluster viscosity c10-11 N s/m.

@article{citeulike:2563145, abstract = {Paramagnetic particles in a liquid above a solid dynamically self-assemble into two-dimensional (2D) viscoelastic clusters in a precessing magnetic field if the precession angle exceeds the magic angle. Hexagonal clusters rotate with a frequency proportional to the precession frequency of the magnetic field. The rotation is explained by viscoelastic shear waves excited in the clusters that can be visualized slightly above the magic angle. The cluster rotation and the visualization of viscoelastic modes are independent techniques to probe the rheological properties of the cluster. We find agreement between both techniques when determining the 2D cluster viscosity c10-11 N s/m.}, author = {Tierno, Pietro and Muruganathan, Ramanathan and Fischer, Thomas M. }, citeulike-article-id = {2563145}, doi = {10.1103/PhysRevLett.98.028301}, journal = {Physical Review Letters}, keywords = {2007, cluster, colloids, magnetic}, number = {2}, posted-at = {2008-03-19 17:17:37}, priority = {2}, publisher = {APS}, title = {Viscoelasticity of Dynamically Self-Assembled Paramagnetic Colloidal Clusters}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000098000002028301000001\&idtype=cvips\&gifs=yes}, volume = {98}, year = {2007} }

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TY - JOUR ID - citeulike:2563145 TI - Viscoelasticity of Dynamically Self-Assembled Paramagnetic Colloidal Clusters JF - Physical Review Letters VL - 98 IS - 2 PB - APS N2 - Paramagnetic particles in a liquid above a solid dynamically self-assemble into two-dimensional (2D) viscoelastic clusters in a precessing magnetic field if the precession angle exceeds the magic angle. Hexagonal clusters rotate with a frequency proportional to the precession frequency of the magnetic field. The rotation is explained by viscoelastic shear waves excited in the clusters that can be visualized slightly above the magic angle. The cluster rotation and the visualization of viscoelastic modes are independent techniques to probe the rheological properties of the cluster. We find agreement between both techniques when determining the 2D cluster viscosity c10-11 N s/m. KW - 2007 KW - cluster KW - colloids KW - magnetic AU - Tierno, Pietro AU - Muruganathan, Ramanathan AU - Fischer, Thomas PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000098000002028301000001&idtype=cvips&gifs=yes ER -

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