The surface properties of pure and modified precipitated calcium carbonate by adsorption of nitrogen and water vapor

Surface Coverage and Its Determination: Role of Acid–Base Interactions in the Surface Treatment of Mineral Fillers

“…The amount of the proportionally change, or more exactly it increased somewhat. A similar observation was also made by Ahsan (14).…”

“…layer coverage (13,14). It is a question of optimization, surface treatment as the above presented basicity (Fig.…”

Defining reactive sites on hydrated mineral surfaces: Rhombohedral carbonate minerals

“…These findings established that water constituents are chemically associated to the surface, allowing for the formation of hydrated surface species. Furthermore, ''chemisorption" of water on the calcite surface was also demonstrated by earlier thermogravimetric studies (Morimoto et al, 1980;Ahsan, 1992). Nevertheless, it is not yet possible to ascertain, by any of these analytical techniques, whether hydration occurs through adsorption of dissociated or undissociated water molecules because these are unable to detect hydrogen atoms, and thus, hydroxyl ions cannot be distinguished from adsorbed H 2 O molecules.…”

Contrasting effects of different types of organic material on surface area and microaggregation of goethite

“…Usually, the C BET constants are lower for organic material than they are for oxide surfaces (Lowen and Broge, 1961;Boki et al, 1993). In consequence, organic coatings lowered the C BET constants of oxides (Lowen and Broge, 1961;Absan, 1992;Kaiser and Guggenberger, 2003), and hence the enthalpy of N 2 adsorption (Eq. (2)).…”