Original paperRehydroxylation of dehydrated silica surfaces by water vapor adsorption
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A temperature-controlled method to produce Janus nanoparticles using high internal interface systems: Experimental and theoretical approaches
2016, Colloids and Surfaces A: Physicochemical and Engineering AspectsCitation Excerpt :As a result, considering the available surface of fixed P1 and P2 bare nanoparticles (Supplementary information, Section S3), the grafting density of APTES (APTES molecules/nm2) onto the surface of P1 and P2 JPNs was obtained to be 6.4 and 22.5, respectively. This shows an increment in free silanol density on the surface of P1 and P2 nanoparticles as a result of rehydroxylation during the modification stage [34,35] (Supplementary information, Section S1) and/or crosslinking of APTES molecules, involving attached and unattached molecules onto the surface of the nanoparticles [36]. Furthermore, the difference between the calculated grafting densities is attributed to some parameters such as the different effects of water media on silica rehydroxylation [35], aggregation of the nanoparticles (more common between P1 nanoparticles due to their size), different attachment state of APTES molecules onto the surface of the nanoparticles [36] and etc.
Combined influence of pore size distribution and surface hydrophilicity on the water adsorption characteristics of micro- and mesoporous silica
2016, Microporous and Mesoporous MaterialsCitation Excerpt :Attributing the different shape of the adsorption isotherm to the broader pore size distribution alone neglects the importance of surface chemistry in the adsorption of water vapor on porous silica and the fact that the hydrophilicity may readily change following the first water adsorption cycle. This change has been attributed to irreversibly adsorbed water or hydroxylation of the silica surface which occurs spontaneously during the adsorption isotherm measurement even at room temperature [11,12,15]. The present study provides insight into the different mechanisms of water adsorption on silica materials with ordered and disordered porosity in the micro- and mesoporous regimes.
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