Charoenrein S, Goddard M, Reid D S
Department of Food Science and Technology, University of California, Davis 95616.
Adv Exp Med Biol. 1991;302:191-8. doi: 10.1007/978-1-4899-0664-9_9.
Using the emulsion technique, we have studied nucleation of ice in aqueous solutions containing silver iodide or Pseudomonas syringae. Using a Differential Scanning Calorimeter (DSC), we determined characteristic temperatures of nucleation, and also rates of nucleation at selected temperatures. The freezing point depression induced by added solute is linearly related to the lowering of both homogeneous and heterogeneous nucleation temperature. Nucleation kinetics depend on a fifth power function of the temperature. Solute is found to affect the parameters of this relationship in different ways, dependent upon the nature of the catalytic site for ice nucleation. We have also studied the effect of composition on the linear propagation velocity (LPV) of ice in undercooled solutions contained in a U-tube. We have determined velocities in a range of concentrations of sugar solution at the same undercooling, and also as a function of undercooling. The role of added polymer has also been investigated. It is affected by the sugar concentration.
我们采用乳液技术，研究了含有碘化银或丁香假单胞菌的水溶液中冰的成核过程。使用差示扫描量热仪（DSC），我们确定了成核的特征温度，以及选定温度下的成核速率。添加溶质引起的冰点降低与均相成核温度和异相成核温度的降低呈线性相关。成核动力学取决于温度的五次方函数。发现溶质以不同方式影响这种关系的参数，这取决于冰成核催化位点的性质。我们还研究了组成对U形管中过冷溶液中冰的线性传播速度（LPV）的影响。我们确定了在相同过冷度下一系列糖溶液浓度中的速度，以及作为过冷度函数的速度。还研究了添加聚合物的作用。它受糖浓度的影响。
