Premelting at Defects Within Bulk Colloidal Crystals Export

@article{yodh05, abstract = {Premelting is the localized loss of crystalline order at surfaces and defects at temperatures below the bulk melting transition. It can be thought of as the nucleation of the melting process. Premelting has been observed at the surfaces of crystals but not within. We report observations of premelting at grain boundaries and dislocations within bulk colloidal crystals using real-time video microscopy. The crystals are equilibrium close-packed, three-dimensional colloidal structures made from thermally responsive microgel spheres. Particle tracking reveals increased disorder in crystalline regions bordering defects, the amount of which depends on the type of defect, distance from the defect, and particle volume fraction. Our observations suggest that interfacial free energy is the crucial parameter for premelting in colloidal and atomic-scale crystals. 10.1126/science.1112399}, author = {Alsayed, A. M. and Islam, M. F. and Zhang, J. and Collings, P. J. and Yodh, A. G.}, booktitle = {Science}, citeulike-article-id = {3345347}, citeulike-linkout-0 = {http://dx.doi.org/10.1126/science.1112399}, citeulike-linkout-1 = {http://www.sciencemag.org/cgi/content/abstract/309/5738/1207}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/15994377}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=15994377}, day = {19}, doi = {10.1126/science.1112399}, journal = {Science}, keywords = {crystals, hydrogel}, month = {August}, number = {5738}, pages = {1207--1210}, posted-at = {2008-09-27 18:06:29}, priority = {2}, title = {Premelting at Defects Within Bulk Colloidal Crystals}, url = {http://dx.doi.org/10.1126/science.1112399}, volume = {309}, year = {2005} }

TY - JOUR ID - yodh05 L3 - citeulike-article-id:3345347 N2 - Premelting is the localized loss of crystalline order at surfaces and defects at temperatures below the bulk melting transition. It can be thought of as the nucleation of the melting process. Premelting has been observed at the surfaces of crystals but not within. We report observations of premelting at grain boundaries and dislocations within bulk colloidal crystals using real-time video microscopy. The crystals are equilibrium close-packed, three-dimensional colloidal structures made from thermally responsive microgel spheres. Particle tracking reveals increased disorder in crystalline regions bordering defects, the amount of which depends on the type of defect, distance from the defect, and particle volume fraction. Our observations suggest that interfacial free energy is the crucial parameter for premelting in colloidal and atomic-scale crystals. 10.1126/science.1112399 IS - 5738 JF - Science EP - 1210 TI - Premelting at Defects Within Bulk Colloidal Crystals VL - 309 T2 - Science SP - 1207 KW - crystals KW - hydrogel AU - Alsayed, AM AU - Islam, MF AU - Zhang, J AU - Collings, PJ AU - Yodh, AG PY - 2005/08/19/ UR - http://dx.doi.org/10.1126/science.1112399 ER -