Acidic Silica Sol Research Articles

Irreversible Dissociation of Tris-2,2′-Bipyridyl-iron(II) Complex in TEOS-Derived Acidic Silica Sol

Irreversible dissociation of tris-2,2′-bipyridine iron(II) (Fe(II)-bpy) to completion in acidic silica sol was elucidated in an attempt to designing silica-supported complex compounds. Liberated Fe(II) was oxidized to form tetrahedral [FeCl4]− ion, preventing regeneration back to Fe(II)-bpy. Change in the rate of dissociation was also discussed by taking competitive coordination of Cl and H2O with Fe(II) into account.

Investigation of Templated Mesoporous Silicate Thin Films Using High Speed, Solid‐State 1H MAS and Double Quantum NMR Spectroscopy

AbstractTwo‐dimensional DQ 1H MAS NMR has been used the investigate the local structure of a surfactant‐templated silicate thin film prepared from adding 4% polyoxyethylene(10) cetyl ether to an acidic TEOS silica sol. A close spatial contact between the surfactant and the silicate present in these materials could be demonstrated, while the high sensitivity of the NMR experiments allowed systems with limited amounts of material to be investigated. The detected inorganic‐organic interactions in these materials provide additional information into the chemical processes occurring during the self‐assembly process and the formation of meso‐structured materials.Graphical representation of the spatial interactions observed between the silanols, oxomethylene protons of the surfactant and water within the template silicate material.magnified imageGraphical representation of the spatial interactions observed between the silanols, oxomethylene protons of the surfactant and water within the template silicate material.

Determination of Sodium Ions in Acidic Silica Sol Systems. Solution Potential Measurement Procedure

Determination of Sodium Ions in Acidic Silica Sol Systems. Solution Potential Measurement Procedure