Oxidative pillaring: The intercalation of a molecular pillar (Me2DABCO2+) into synthetic Cs‐tainiolite, which shows sufficient intracrystalline reactivity by an oxidative cation‐exchange mechanism, yields a material with microporosity that resembles zeolites in both narrow pore size distribution and total pore volume. Owing to the high structural Fe content, this pillared clay provides a size‐selective, shape‐selective, and electronically conducting framework.
The sol‐gel transition of a novel glycol ester of ortho silicic acid is investigated by small angle neutron scattering technique. We measured the changes of scattering intensity as a function of time during gelation and show the formation of a fractal structure.
When we mix our ester with an aqueous surfactant solution no precipitate is formed as observed in common template synthesis of mesoporous materials. Because of the water solubility of our silicate precursor it can be dissolved into the surfactant phase without phase separation. During hydrolysis of the precursor ethylene glycol is produced which does not affect the hydrophobic interaction of the surfactant.
It is shown by contrast variation that surfactant does not affect the fractal dimension of the final silica gel. Measurements after gelation demonstrate the unchanged presence of surfactant micelles.
Silsesquioxanes are formed in situ during mixing and curing of a phenolic resin and a molecular silane precursor (3-(triethoxysilyl)-1-propaneamine) yielding a nanocomposite. As indicated by a higher onset temperature, a higher characteristic decomposition temperature, and a lower maximum heat flow, the thermal stability of the nanocomposite is significantly improved over the pristine resin. Moreover, the bending strength and the strain at break could also be enhanced by 36% and 51%, respectively. The nanocomposite was characterized by 29 Si solidstate NMR, STEM/EDS, TGA, DSC, and three point bending tests. The STEM/EDS measurements showed a homogenous distribution of silsesquioxanes in the phenolic resin.
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