Rate equations for sodium catalyzed amorphous silica dissolution
نویسندگان
چکیده
منابع مشابه
Kinetics of amorphous silica dissolution and the paradox of the silica polymorphs.
The mechanisms by which amorphous silica dissolves have proven elusive because noncrystalline materials lack the structural order that allows them to be studied by the classical terrace, ledge, kink-based models applied to crystals. This would seem to imply amorphous phases have surfaces that are disordered at an atomic scale so that the transfer of SiO(4) tetrahedra to solution always leaves t...
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Co-amorphous systems is one of the attractive strategies used to enhance the dissolution rates of poorly soluble drugs. This strategy has an additional advantage as it has the ability to overcome stability issues that may arise from the conversion of a crystalline drug into its amorphous form. In this study, quench cooling was used to prepare co-amorphous forms of carbamazepine (CBZ) with sacch...
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Using molecular-dynamics computer simulations we investigate how in silica the glass transition and the properties of the resulting glass depend on the cooling rate with which the sample is cooled. By coupling the system to a heat bath with temperature Tb(t), we cool the system linearly in time, Tb(t)5Ti2gt , where g is the cooling rate. In qualitative accordance with experiments, the temperatu...
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There have been a number of studies that have examined metal precipitation reactions on an array of natural soil materials. While many of these investigations have focused on model single-component systems, recent research has appeared on metal precipitation on soils and clay fractions of soils. However, few studies have explored mixed model component systems, which may lead to a better underst...
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Molecular dynamics simulations employing reactive potentials were used to determine the activation barriers to the dissolution of the amorphous SiO2 surface in the presence of a 2 nm overlayer of water. The potential of mean force calculations of the reactions of water molecules with 15 different starting Q4 sites (Qi is the Si site with i bridging oxygen neighbors) to eventually form the disso...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2016
ISSN: 0016-7037
DOI: 10.1016/j.gca.2016.09.020