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Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning

Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning Xinsheng Ling, Brown University, DMR 1005705.

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Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning

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  1. Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning Xinsheng Ling, Brown University, DMR 1005705 Motivation: Mono-disperse colloidal particles act as ‘mesoscopic’ atoms, large enough to be seen by an optical microscope yet small enough to exhibit thermodynamic behavior. In this program, small colloidal particles are used as a model system for addressing the fundamental problems in condensed matter physics. Specifically, pinned 1D and 2D colloidal lattices will be created using microfabrication techniques and probed using optical tweezers and video microscopy. The results will help answer basic questions such as: What is a solid? Is glass a new phase of matter? Highlights of results from previous NSF support: NSF-DMR-9804083 -Invented a method for creating point defects in a 2D colloidal crystal. -Observed the Peierls barrier for an edge-dislocation. -Observed the collective pinning behavior of a 2D colloidal crystal and the formation of Larkin domains. Personnel: Alexandros Pertsinidis received Ph.D. from carrying out research in colloid physics in 2002 and is now an assistant professor (tenure-track) at Sloane-Kettering Research Institute, NY. Rachel Pepper received Sc.B. degree and went to Harvard for her Ph.D.

  2. Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning Xinsheng Ling, Brown University, DMR 1005705 Publications from NSF-DMR-9804083: [1] A. Pertsinidis and X.S. Ling, "Equilibrium Configurations and Energetics of Point Defects in Two-Dimensional Colloidal Crystals", Physical Review Letters, 87, 098303 (2001). [2] A. Pertsinidis and X.S. Ling, "Diffusion of Point Defects in Two-Dimensional Colloidal Crystals", Nature, 413, 147 (2001). [3] A. Pertsinidis and X.S. Ling, "Video microscopy and micromechanics studies of one- and two-dimensional colloidal crystals“, New Journal of Physics, 7, 33 (2005). [4] A. Pertsinidis and X.S. Ling, "Statics and Dynamics of 2D Colloidal Crystals in a Random Pinning Potential", Physical Review Letters, 100, 028303 (2008). A 2D colloidal crystal A 2D colloidal glass

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