کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
75309 | 49113 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Water desorption from resorcinol-formaldehyde hydrogels and adsorption in the resulting xerogels Water desorption from resorcinol-formaldehyde hydrogels and adsorption in the resulting xerogels](/preview/png/75309.png)
Water desorption isotherms of resorcinol-formaldehyde (RF) hydrogels and subsequent water adsorption isotherms of the resulting xerogels are determined using the static gravimetric method, at various temperatures. Isotherms obtained from samples synthesized at various pH are compared. Two different mechanisms are involved in RF hydrogels water desorption. At large relative humidity the capillary tension resulting from water removal induces a macroscopic shrinkage of the gel, whereas at low humidity water is evaporated with no network deformation. These two mechanisms are analyzed using a plastic deformation model and the Guggenheim-Anderson-de Boer (GAB) model, respectively. Adsorption isotherms of RF xerogels are analyzed using the GAB model.
Journal: Microporous and Mesoporous Materials - Volume 117, Issues 1–2, 1 January 2009, Pages 61–66