Melting of two-dimensional tunable-diameter colloidal crystals

@article{han08, abstract = {Melting of two-dimensional colloidal crystals is studied by video microscopy. The samples were composed of microgel spheres whose diameters could be temperature tuned, and whose pair potentials were measured to be short ranged and repulsive. We observed two-step melting from the crystal to a hexatic phase and from the hexatic to the liquid phase as a function of the temperature-tunable volume fraction. The translational and orientational susceptibilities enabled us to definitively determine the phase transition points, avoiding ambiguities inherent in other analyses and resolving a ” dislocation precursor stage” in the solid phase that some of the traditional analyses may incorrectly associate with the hexatic phase. A prefreezing stage of the liquid with ordered patches was also found.}, author = {Han, Y. and Ha, N. Y. and Alsayed, A. M. and Yodh, A. G.}, citeulike-article-id = {2874159}, doi = {10.1103/PhysRevE.77.041406}, journal = {Physical Review E}, keywords = {2d, crystals, hydrogel}, number = {4}, pages = {041406}, posted-at = {2008-09-27 18:02:18}, priority = {2}, publisher = {APS}, title = {Melting of two-dimensional tunable-diameter colloidal crystals}, url = {http://dx.doi.org/10.1103/PhysRevE.77.041406}, volume = {77}, year = {2008} }

TY - JOUR ID - han08 L3 - citeulike-article-id:2874159 N2 - Melting of two-dimensional colloidal crystals is studied by video microscopy. The samples were composed of microgel spheres whose diameters could be temperature tuned, and whose pair potentials were measured to be short ranged and repulsive. We observed two-step melting from the crystal to a hexatic phase and from the hexatic to the liquid phase as a function of the temperature-tunable volume fraction. The translational and orientational susceptibilities enabled us to definitively determine the phase transition points, avoiding ambiguities inherent in other analyses and resolving a “dislocation precursor stage” in the solid phase that some of the traditional analyses may incorrectly associate with the hexatic phase. A prefreezing stage of the liquid with ordered patches was also found. IS - 4 JF - Physical Review E EP - 041406 TI - Melting of two-dimensional tunable-diameter colloidal crystals PB - APS VL - 77 SP - 041406 KW - 2d KW - crystals KW - hydrogel AU - Han, Y AU - Ha, NY AU - Alsayed, AM AU - Yodh, AG PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevE.77.041406 ER -