Control of magnesia–alumina properties by acetic acid in sol–gel synthesis

Aluminum lactate – An attractive precursor for sol–gel synthesis of alumina-based glasses

“…Fig. 4(g) 6 ] 3À (À13 ppm) sites, respectively, indicating that the H 2 O group linked to Al in the sols now are entirely replaced by phosphate ligands in the xerogel state. The increased degree of P/Al connectivity from sol to gel is further confirmed by the evolution of the 31 P spectra.…”

“…were successfully developed to prepare one-or two-component alumina-based materials (e.g. alumina, aluminum phosphate and magnesia-alumina) [5][6][7][8][9][10]. In spite of these possibilities, the sol-gel chemistry has so far been poorly developed and not well understood for alumina-containing systems.…”

Molecular precursors for (nano) materials — a one step strategy

“…Spinels of the composition MMЈ 2 O 4 (M = two valent metal atom, MЈ = three valent metal atom) synthesized by sol-gel or similar processes can be obtained as nano-meter sized crystallites and are of broad and general interest because of their applications. [34][35][36][37][38][39] In our laboratory single source precursors of the type M[Al(OR) 4 ] 2 (M = Mg, Fe, Co, Ni, Cu, Zn; R = i Pr, t Bu) have been used in water/oil microemulsion sol-gel techniques 40, 41 or in simple iso-propanol/water mediated sol-gel routes to obtain nanoscaled spinel powders. 42 The spinel MgAl 2 O 4 has also been prepared by classical techniques.…”

Novel Sol−Gel Synthesis of Sodium Aluminophosphate Glass Based on Aluminum Lactate

“…The introduction of alumina into multiple-network former systems has remained a considerable challenge, because commonly used aluminum alkoxide precursors are highly reactive toward water, resulting in rapid hydrolysis and precipitation processes . Approaches combatting this problem include (a) addition of the alumina source to prehydrolyzed sols containing the other constituents, or (b) reducing the basicity of the aluminum precursors by choice of suitable ligands and complexation reagents . For example, some new sol−gel routes based on aluminum-tri- sec -butoxide (Al(OBu s ) 3 ), modified with ethylacetoacetate, oxalic acid, ethanolamine, butane diol, etc., were successfully developed to prepare aluminum phosphate and other one- or two-component alumina-based materials (e.g., alumina and magnesia-alumina). ,− Despite these possibilities, the sol−gel chemistry of the ternary Na 2 O−Al 2 O 3 −P 2 O 5 glassforming system has so far been poorly developed and not well understood.…”