Finite-size and surface effects on the glass transition of liquid toluene confined in cylindrical mesopores Export

@article{morineau02, abstract = {Some of the most regular porous silicates (MCM-41 and SBA-15), with several different pore diameters from 2.4 to 8.7 nm, are used to study the van der Waals fragile liquid toluene in confined geometry. We measure two major macroscopic signatures of a glass transition, i.e., a discontinuous change in the heat capacity and in the thermal expansion, by adiabatic calorimetry and neutron scattering experiments. A nontrivial size dependence of the glass transition features, most notably a nonmonotonic variation of the mean glass transition temperature, is observed. The range of the glass transition is found extremely broad. This supports the notion of competition between surface boundary conditions and cutoff or finite-size effects. {\copyright}2002 American Institute of Physics.}, author = {Morineau, Denis and Xia, Yongde and Simionesco, Christiane A.}, citeulike-article-id = {1702042}, citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JCPSA6000117000019008966000001&idtype=cvips&gifs=yes}, citeulike-linkout-1 = {http://link.aip.org/link/?JCP/117/8966}, citeulike-linkout-2 = {http://dx.doi.org/10.1063/1.1514664}, comment = {Intriguingly, the glass transition temperature \$T\_g\$ can be both smaller or larger in confined geometries, even for the same material. For strong interactions (or atomically rough surfaces) the glass transition happens ``sooner,'' that is, confinement increases \$T\_g\$ by slowing motion near the surfaces.}, doi = {10.1063/1.1514664}, journal = {The Journal of Chemical Physics}, keywords = {confinement, goldman}, number = {19}, pages = {8966--8972}, posted-at = {2007-09-27 17:43:05}, priority = {0}, publisher = {AIP}, title = {Finite-size and surface effects on the glass transition of liquid toluene confined in cylindrical mesopores}, url = {http://dx.doi.org/10.1063/1.1514664}, volume = {117}, year = {2002} }

TY - JOUR ID - morineau02 L3 - citeulike-article-id:1702042 N2 - Some of the most regular porous silicates (MCM-41 and SBA-15), with several different pore diameters from 2.4 to 8.7 nm, are used to study the van der Waals fragile liquid toluene in confined geometry. We measure two major macroscopic signatures of a glass transition, i.e., a discontinuous change in the heat capacity and in the thermal expansion, by adiabatic calorimetry and neutron scattering experiments. A nontrivial size dependence of the glass transition features, most notably a nonmonotonic variation of the mean glass transition temperature, is observed. The range of the glass transition is found extremely broad. This supports the notion of competition between surface boundary conditions and cutoff or finite-size effects. ©2002 American Institute of Physics. IS - 19 JF - The Journal of Chemical Physics EP - 8972 TI - Finite-size and surface effects on the glass transition of liquid toluene confined in cylindrical mesopores PB - AIP VL - 117 SP - 8966 KW - confinement KW - goldman N1 - Intriguingly, the glass transition temperature $T_g$ can be both smaller or larger in confined geometries, even for the same material. For strong interactions (or atomically rough surfaces) the glass transition happens ``sooner,'' that is, confinement increases $T_g$ by slowing motion near the surfaces. AU - Morineau, Denis AU - Xia, Yongde AU - Simionesco, Christiane PY - 2002/// UR - http://dx.doi.org/10.1063/1.1514664 ER -