Composite Water Sorbents of the Salt in Silica Gel Pores Type: The Effect of the Interaction between the Salt and the Silica Gel Surface on the Chemical and Phase Compositions and Sorption Properties

Formation of the active surface of Ag/SiO2 catalysts in the presence of FeO x additives

“…In studying the nature and structure of iron(III) hydroxo/oxo com plexes in aqueous solutions of ferric nitrate in a con centration range of 0.003-0.2 M, the authors of [9] found that in the pH range of 0.0-3.0, these solutions contain no polymeric forms of iron complexes except for aquated monomeric centers in the form of It is known that the impregnation of silica with salt solutions is accompanied by the ionization of surface silanol groups and the surface adsorption of the cat ions [10]. Doubly and more highly charged cations are capable of forming complexes in which metal cations are bonded to two silanol surface groups.…”

Water Vapor Sorption Characteristics of Calcium Chloride-Anodized Alumina Composites

“…Therefore, calcium chloride in Oxal773 and Sulf473 would be amorphous phase. The formation of amorphous metal salt is considered to be associated with the interfacial interaction, i.e., adsorption of metal cation onto the oxide surface during solution impregnation (Gordeeva et al, 2005). Uvarov (1996Uvarov ( , 2000 also reported that for metal saltalumina composites, the peak intensities of crystalline salt weakened with an increase in mole fraction of alumina nanoparticles.…”

“…These sorption behaviors imply that calcium chloride in Composites Oxal773 and Sulf473 has amorphous phase. Gordeeva et al (2005Gordeeva et al ( , 2006 reported that the water sorption isotherm for crystalline calcium chloride in nanopores showed a stepwise pattern, but for amorphous salt the sorption isotherm became a linear shape. Composite Sulf773 with tricalcium aluminate poorly sorbs water vapor.…”

“…Some researchers reported that the sorption isotherms or isobars for metal salt composites had not stepwise shapes but linear shapes when metal salts were deposited in pores smaller than 15 nm (Gordeeva et al, 2002;Simonova et al, 2009;Tokarev et al, 2010;Yu et al, 2014). Furthermore, Gordeeva et al (2005) observed the formation of amorphous calcium chloride in pores of nanoporous silica gel when the composite was prepared through calcination at a relativelyhigh temperature after solution impregnation. The amount of water vapor sorbed on amorphous calcium chloride increased monotonously with the relative vapor pressure.…”

The anti-supercooling effect of surface-modified nano-scaled SiO2in hydrated salts phase transition system

“…From the information of solid surface absorption and surface characteristics of silica gel [17], the absorption relationship between hydroxyl bonds on kinds of SiO 2 surface and salt solution belongs to polar absorption. The surface silanol groups are ionized in aqueous solutions of electrolytes: The metal cations can be absorbed on the surface:…”