Chimie-ParisTech & CNRS UMR 7575, 11 rue Pierre et Marie Curie, 75005 Paris, France.
J Colloid Interface Sci. 2013 Oct 15;408:206-11. doi: 10.1016/j.jcis.2013.07.013. Epub 2013 Jul 23.
The results of an experimental study on the evaporation and boiling of water confined in the pores of deposits made of mono-dispersed silica colloidal micro-spheres are reported. The deposits are studied using scanning electron microscopy, adsorption of nitrogen, and adsorption of water through attenuated total reflection-infrared spectroscopy. The evaporation is characterized using differential scanning calorimetry and thermal gravimetric analysis. Optical microscopy is used to observe the patterns on the deposits after evaporation. When heating at a constant rate and above boiling temperature, the release of water out of the deposits is a two step process. The first step is due to the evaporation and boiling of the surrounding and bulk water and the second is due to the desorption of water from the pores. Additional experiments on the evaporation of water from membranes having cylindrical pores and of heptane from silica deposits suggest that the second step is due to the morphology of the deposits.
报道了在由单分散二氧化硅胶体微球制成的沉积物的孔隙中限制的水的蒸发和沸腾的实验研究结果。使用扫描电子显微镜、氮气吸附和衰减全反射-红外光谱法研究沉积物。使用差示扫描量热法和热重分析来描述蒸发过程。使用光学显微镜观察蒸发后沉积物上的图案。当以恒定速率加热且高于沸点时，水从沉积物中的释放是一个两步过程。第一步是由于周围和本体水的蒸发和沸腾，第二步是由于水从孔隙中的解吸。关于具有圆柱孔的膜中水的蒸发和从二氧化硅沉积物中蒸发正庚烷的额外实验表明，第二步是由于沉积物的形态所致。
