Correlated orientational and translational motions in supercooled liquids

@article{bagchi02, abstract = {We have carried out NPT molecular dynamics simulations of isolated ellipsoids in a glass forming binary mixture to gain insight into the nature of orientational relaxation (OR) in a viscous liquid. At high pressures when the liquid is highly viscous, the OR is found to occur mainly via correlated hopping, sometimes involving participation of several neighboring atoms, placed in a ring like tunnel. In the glassy state, hopping is found to be accompanied by larger fluctuations in the total energy and the volume of the system. Both orientational and translational hopping are found to be gated, restricted primarily by the entropic bottlenecks, with the orientational motion becoming increasingly slower than the translation as the pressure is increased. Orientational relaxation is found to occur with a wide distribution of decay times.}, author = {Bhattacharyya, Sarika and Mukherjee, Arnab and Bagchi, Biman }, citeulike-article-id = {1998445}, journal = {The Journal of Chemical Physics}, keywords = {dyn-het, rotation}, number = {6}, pages = {2741--2746}, posted-at = {2007-11-28 00:55:32}, priority = {3}, publisher = {AIP}, title = {Correlated orientational and translational motions in supercooled liquids}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=JCPSA6000117000006002741000001\&idtype=cvips\&gifs=yes}, volume = {117}, year = {2002} }

TY - JOUR ID - bagchi02 L3 - citeulike-article-id:1998445 TI - Correlated orientational and translational motions in supercooled liquids JF - The Journal of Chemical Physics VL - 117 IS - 6 SP - 2741 EP - 2746 PB - AIP N2 - We have carried out NPT molecular dynamics simulations of isolated ellipsoids in a glass forming binary mixture to gain insight into the nature of orientational relaxation (OR) in a viscous liquid. At high pressures when the liquid is highly viscous, the OR is found to occur mainly via correlated hopping, sometimes involving participation of several neighboring atoms, placed in a ring like tunnel. In the glassy state, hopping is found to be accompanied by larger fluctuations in the total energy and the volume of the system. Both orientational and translational hopping are found to be gated, restricted primarily by the entropic bottlenecks, with the orientational motion becoming increasingly slower than the translation as the pressure is increased. Orientational relaxation is found to occur with a wide distribution of decay times. KW - dyn-het KW - rotation AU - Bhattacharyya, Sarika AU - Mukherjee, Arnab AU - Bagchi, Biman PY - 2002/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JCPSA6000117000006002741000001&idtype=cvips&gifs=yes ER -