A gas phase, probe molecule doser was fabricated and connected to a diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reaction chamber study the reactions stability of two organosilanes with surfaces metallic aluminum boehmite powders in situ. Two powder were studied, including an as-received, native oxide layer surface, laboratory prepared, boehmite-like surface. Neat also u...

The influence of NaNO2, HNO3 and H2SO4 on the structure and morphology of gamma-alumina was investigated by XRD, BET, SEM and FT-IR spectroscopy. Selected amounts of NaNO2, HNO3 and H2SO4 were added to a solution of aluminum isopropoxide (as a precursor for the boehmite synthesis). The boehmite samples were calcined at 350 and 600 ℃ to form the semi-crystalline high surface area gamma-Al2O3. Th...

In this work, mesoporous spherical γ-AlOOH and γ-Al2O3 particles were rapidly prepared by spray pyrolysis (SP) at different temperatures (400°C–700°C) without the use of template materials. A sol-gel-derived colloidal solution boehmite was ultrasonicated to generate fine droplets, which continuously transferred into a quartz reactor heated specific temperature constant flow N2 gas. Under ultras...

Colloidal gels respond as soft solids at rest, whereas they flow liquids under external shear. Starting from a fluidized state an applied shear rate ${\stackrel{\ifmmode \dot{}\else \.{}\fi{}}{\ensuremath{\gamma}}}_{p}$, abrupt cessation triggers liquid-to-solid transition during which the stress relaxes towards so-called residual ${\ensuremath{\sigma}}_{\mathrm{res}}$ that tallies macroscopic ...