Boehmite sol-gels were seeded by adding <2.0 wt%α-alumina powder to a 20% boehmite hydrosol at pH =3. The seeded gel sintered to 98% of theoretical density after 100 min at 1200°C, whereas the ...

12%Abstract Sol–gel boehmite coatings were produced on the polished surfaces of hypo-eutectoid C45carbon steel by dip coating. After the deposition the coatings were heat treated by drying at RT, 150 and 200 °C. It was found that for crack-free coatings, the drying temperature needs to be ≥150 °C. Properly heat-treated boehmite coatings then improve the corrosion resistance …

The transformation, microstructural development, and densification of an α-alumina-seeded boehmite sol-gel was studied. α-Alumina particles are shown to act as nuclei for the trans- formation of θ- to α-alumina and to result in an increase in the transformation kinetics and lowering of the transformation temperature by as much as 170°C.

A boehmite/PVA membrane resulting from the sol–gel method showed higher adsorption amount of 30.97 mg/g than the pure boehmite (11.19 mg/g) and commercial boehmite …

After physical sol-gel condensation of boehmite NPs (Fig. 1b), porous xerogel was formed (Fig. 1c). This matrix can be used for protein entrapment. This …

Sol–gel research grew to be so important that in the 1990s more than 35,000 papers were published worldwide on the process. Particles and polymers. The sol–gel process is a wet-chemical technique used for the fabrication of both glassy and ceramic materials. In this process, the sol (or solution) evolves gradually towards the formation of a ...

Due to our ability to adjust the key physical properties of the aluminas, these aluminas and boehmites have found their way into a broad range of different applications, including catalyst supports, coatings, polymer additives, sol-gel abrasives, and ceramics. We are a producer of: Boehmite; High purity alumina; Dispersible alumina; Hydrotalcites

Boehmite particles were prepared by a facile sol–gel method using sodium aluminate as the precursor under ambient conditions, and they were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), nitrogen adsorption, etc. It is found that the boehmite particles consist of flat nanostrips, which are about 230 nm in length ...

Dehydroxylation and high temperature phase formation in sol-gel boehmite characterized by Fourier transform infrared spectroscopy. G. KRISHNA PRIYA 1, P. PADMAJA 1, K. G. K. WARRIER 1, A. D. DAMODARAN 1 & G. ARULDHAS 1 Journal of Materials Science Letters volume 16, pages 1584–1587 (1997)Cite this article

A two layer ultrafiltration alumina membrane was prepared by a sol-gel process using boehmite sol as precursor. The sol was prepared by hydrolysation of aluminium tri-sec-butoxide.Sol properties, such as viscosity as a function of concentration and acidity, were investigated by using capillary viscometry, transmission electron microscopy and laser scattering photometry etc.

Sol-Gel transformation: Sol-gel is the process in which a sol agglomerates to form a gel. In this study, the influences of pH on the zero-shear viscosity of boehmite dissolved in water is depicted in Fig. 4. The curve shows similar trends in their viscosity values with respect to pH of boehmite sols.

Hydrated boehmite with nano-sized crystallites AlO(OH)·0.8H 2 O are obtained through a very reproducible sol–gel procedure and characterized using powder X-ray diffraction, in-situ IR spectroscopy, thermal analysis, BET surface area and photoelectron spectroscopy.. The thermal evolution of hydrated boehmite leads first to hydrated γ-alumina Al 2 O 3 ·0.33H 2 O = Al 2 O 2.67 (OH) 0.66 and ...

One of the most used preparation procedures for boehmite consists of a combination of the sol−gel and solvothermal strategies; a more or less amorphous precursor obtained by hydrolysis or ...

Among the six crystalline phases of alumina, only boehmite is biocompatible and also will be used for further biological tests. After physical sol-gel condensation of boehmite NPs (Fig. 1b ...

Thin crystallites of boehmite were synthesized by annealing a sol-gel precursor under hydrothermal conditions. Samples were characterized with X-ray powder diffraction, thermogravimetry, transmission electron microscopy, and by refining the crystalline phases. Fresh samples consisted of boehmite sheets forming folded paper-like "crystallites," which were transformed into thin flat crystalline ...

Abstract Sol–gel boehmite coatings were produced on the polished surfaces of hypo-eutectoid C45carbon steel by dip coating. After the deposition the coatings were heat treated by drying at RT, 150 and 200 °C. It was found that for crack-free coatings, the drying temperature needs to be ≥150 °C. Properly heat-treated boehmite coatings then improve the corrosion resistance of steel, while ...