Fri, 25 Jul 2008 04:50:08 BST CiteULike: dchens cohen http://www.citeulike.org/user/dchen/tag/cohen CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2746695 <i>(2006)</i> Dynamics of dislocations in thin colloidal crystals Cohen Schall Weitz (2006) 2008-05-02T17:54:23-00:00 2006 cohen colloid defect schall weitz http://www.citeulike.org/user/dchen/article/2713489 <i>Physical Review Letters, Vol. 93, No. 4. (23 July 2004), 046001.</i> Shear-Induced Configurations of Confined Colloidal Suspensions Itai Cohen Thomas Mason David Weitz doi:10.1103/PhysRevLett.93.046001 Physical Review Letters, Vol. 93, No. 4. (23 July 2004), 046001. 2008-04-24T16:40:15-00:00 2004 Physical Review Letters 93 4 046001 American Physical Society cohen shear weitz http://www.citeulike.org/user/dchen/article/2710365 <i>Science, Vol. 305, No. 5692. (24 September 2004), pp. 1944-1948.</i><br /><br />The dominant mechanism for creating large irreversible strain in atomic crystals is the motion of dislocations, a class of line defects in the crystalline lattice. Here we show that the motion of dislocations can also be observed in strained colloidal crystals, allowing detailed investigation of their topology and propagation. We describe a laser diffraction microscopy setup used to study the growth and structure of misfit dislocations in colloidal crystalline films. Complementary microscopic information at the single-particle level is obtained with a laser scanning confocal microscope. The combination of these two techniques enables us to study dislocations over a range of length scales, allowing us to determine important parameters of misfit dislocations such as critical film thickness, dislocation density, Burgers vector, and lattice resistance to dislocation motion. We identify the observed dislocations as Shockley partials that bound stacking faults of vanishing energy. Remarkably, we find that even on the scale of a few lattice vectors, the dislocation behavior is well described by the continuum approach commonly used to describe dislocations in atomic crystals. 10.1126/science.1102186 Visualization of Dislocation Dynamics in Colloidal Crystals Peter Schall Itai Cohen David Weitz Frans Spaepen doi:10.1126/science.1102186 Science, Vol. 305, No. 5692. (24 September 2004), pp. 1944-1948. 2008-04-23T22:01:50-00:00 2004 Science 305 5692 1944 1948 cohen schall science shear weitz