Processable aluminosilicate alkoxide precursors from metal oxides and hydroxides. The oxide one-pot synthesis process

Synthesis of Ultrafine β″‐Alumina Powders via Flame Spray Pyrolysis of Polymeric Precursors

“…Deuterium oxide (D 2 O) in a sealed inner tube served as the lock solvent, and a 1M solution of AlCl 3 in D 2 O:H 2 O (1:1) served as the external reference. 13 C NMR spectra were obtained with the spectrometer operating at 90.5 MHz and using a 20000 Hz spectral width, a relaxation delay of 0.2 s, and a pulse width of 4.1°.…”

“…13 No precipitate forms as the solution is concentrated, which indicates that all the component metals remain dissolved and, hence, intimately mixed. This property is essential for subsequent flame spray pyrolysis because it minimizes phase separation, which ensures that the final ceramic composition mirrors that of the precursor.…”

“…First, new metal alkoxide precursors were synthesized based on a one-pot dissolution of metal hydroxides or oxides in ethylene glycol made basic with triethanolamine. 13 These precursors provide for stable atomicscale mixing of the component metals. Second, when atomized and combusted in a flame spray pyrolysis apparatus (∼2000°C), ethanolic solutions of these precursors have yielded nanosized particles of the target oxide.…”

Cross-linking of functionalised siloxanes with alumatrane: Reaction mechanisms and kinetics

“…Among different reactants for the preparation of Alcontaining ceramics by means of sol-gel methods, alumatrane, which can easily be prepared from the hydroxide, is one of the most convenient ones [4]. It is less sensitive to hydrolysis, compared to other alkoxide homologues, and, therefore, can be more controllably hydrolyzed and co-condensated in the presence of suitable polymers avoiding phase segregation in the multi-component chemical systems [8,9].…”

Preparation of Mullite Ceramics from Coprecipitated Aluminum Hydroxide and Kaolinite Using Hexamethylenediamine

“…14 Other processing routes involve the so-called transient viscous sintering process, due to Sacks et al 15 A new processing approach has also been proposed, i.e., oxide one-pot synthesis, for mullite and other ceramics. 16 The present paper deals with the preparation of mullite and mullite-based composites using a chemical processing route with hexamethylenediamine (HMDA). To our best knowledge, this is the first time that HMDA has been used for mullite preparation.…”