Pursell Christopher J, Phillips Leon F
Chemistry Department, Trinity University, San Antonio, Texas, USA.
Phys Chem Chem Phys. 2006 Oct 28;8(40):4694-9. doi: 10.1039/b608369b. Epub 2006 Sep 19.
The Onsager heat of transport Q* has been measured for water vapour at the surface of water, supercooled water, and ice, over the temperature range -8 to +10 degrees C. For liquid water, Q* is constant at -24.7 +/- 3.6 kJ mol(-1) (two standard deviations) over the pressure range 4-9.5 Torr. Provided the ice is suitably aged, the |Q*| values are very similar for water and ice, a result which is consistent with the presence of a liquid-like layer at the surface of ice. The values are slightly larger for ice, in proportion to the ratio of the heat of sublimation of ice to the heat of vaporization of the liquid. Departures from linearity of plots of P against DeltaT are attributed to temperature jumps at the surface of the dry upper plate. Hence jump coefficients and thermal accommodation coefficients have been derived as a function of temperature for collisions of water molecules with type-304 stainless steel.
已在-8至+10摄氏度的温度范围内，对水、过冷水和冰表面的水蒸气测量了昂萨格输运热Q*。对于液态水，在4 - 9.5托的压力范围内，Q恒定为-24.7±3.6 kJ mol⁻¹（两个标准偏差）。如果冰经过适当老化，水和冰的|Q|值非常相似，这一结果与冰表面存在类液层一致。冰的Q*值稍大，与冰的升华热和液体汽化热的比值成比例。P对ΔT的曲线偏离线性归因于干燥上板表面的温度跃升。因此，已得出水分子与304型不锈钢碰撞时的跃升系数和热适应系数随温度的函数关系。
