Pore structure of silica gel: a comparative study through BET and PALS

Silica- and sulfate-bearing rock coatings in smelter areas: Products of chemical weathering and atmospheric pollution I. Formation and mineralogical composition

“…This unique structure provides a high surface area with strong sorbing properties (Unger, 1979;Dutta et al, 2005). Silica gel has a high affinity for the formation of metal complexes: Fig.…”

Reactivity of biogenic silica: Surface versus bulk charge density

“…Based on the results, we propose that silanol groups participating in (de)protonation reactions are not restricted to the external surfaces of bSiO 2 particles, but also include groups located inside the bulk phase that are not detected by gas adsorption (BET) techniques. Such internal groups have been proposed for synthetic silica gel based on results of positron annihilation lifetime spectroscopy (Dutta et al, 2005). The existence of varying proportions of ionizable groups located at and below the external surface of bSiO 2 particles helps explain the observed variations in charging behavior among different biogenic silicas, as well as the apparent lack of correlation between the electrical charge density and the dissolution kinetics of bSiO 2 .…”

Characterization of morphology and texture of several amorphous nano-silica particles used in concrete

“…Even though there are several studies that describe the main properties of nano-silica particles [11,[13][14][15], most publications focus on applications of nano-silica in catalysis and not on its use in concrete. The knowledge of the main physicochemical characteristics of silica additives, such as morphology and texture, are important parameters for the design, and for the prediction of the water demand of concrete mixes.…”