Structure and dynamics of liquids confined in mesoporous organosilica

用差示扫描量热法、原位X射线衍射法、中子自旋回波和准弹性中子散射等方法研究了Ph-PMO和TMS-Ph-PMO两种介孔有机硅(PMO)中水的热行为、结构和动力学性质。水的氢键网络比主体水的氢键网络更加扭曲，水分子的平移运动受到限制和与壁面的相互作用的影响更大。壁的疏水性越强，水分子在约束中的平移和转动运动的激活能就越小。

Thermal behavior, structure and dynamic properties of water confined in two types of mesoporous organosilica (PMO), i.e. Ph-PMO where the phenyl groups are embedded in silica matrix, and TMS-Ph-PMO where the silanol groups of Ph-PMO are modified by tetramethyl silane, and Sephadex G15 polymer gels as a model of biological cell have been investigated by differential scanning calorimetry, in situ X-ray diffraction, and neutron spin echo and quasielastic neutron scattering measurements. The hydrogen bonded network of water is more distorted and the translational motion of water molecules is more retarded due to confinement and the interactions with the walls than those of bulk water. The more hydrophobic the wall, the less the activation energy of the translational and rotational motions of a water molecule in confinement.