Modification of aluminum alkoxides with β-ketoesters: new insights into formation, structure and stability

Lichtenberger, Robert; Puchberger, Michael; Baumann, Stefan; Schubert, Ulrich

doi:10.1007/s10971-008-1890-1

Cited by 21 publications

(54 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The enol form of MAEAA is stabilized by chelation with an alkoxide. Further, the reaction also results in the stoichiometric replacement of an alkoxy group (e.g., an iso ‐propoxy group from gallium (III) iso ‐propoxide) by a β‐ketoester ligand,23–25 as shown in Equation 2. The general reaction of an alkoxide with MAEAA is shown in Equation 3.…”

Section: Resultsmentioning

confidence: 99%

A Universal Scheme for Patterning of Oxides via Thermal Nanoimprint Lithography

Dinachali

Saifullah

Ganesan

et al. 2012

Adv Funct Materials

View full text Add to dashboard Cite

Direct patterning of oxides using thermal nanoimprint lithography is performed using either the sol-gel or methacrylate route. The sol-gel method results in resists with long shelf-life, but with high surface energy and a considerable amount of solvent that affects the quality of imprinting. The methacrylate route, which is limited to certain oxides, produces polymerizable resists, leading to low surface energy, but suffers from the shorter shelf-life of precursors. By combining the benignant elements from both these routes, a universal method of direct thermal nanoimprinting of oxides is demonstrated using precursors produced by reacting an alkoxide with a polymerizable chelating agent such as 2-(methacryloyloxy)ethyl acetoacetate (MAEAA). MAEAA possesses β -ketoester, which results in the formation of environmentally stable, chelated alkoxide with long shelf-life, and methacrylate groups, which provide a reactive monomer pendant for in situ copolymerization with a cross-linker during imprinting. Polymerization leads to trapping of cations, lowering of surface energy, strengthening of imprints, which enables easy and clean demolding over 1 cm × 2 cm patterned area with ≈ 100% yield. Heat-treatment of imprints gives amorphous/crystalline oxide patterns. This alliance between two routes enables the successful imprinting of numerous oxides including

show abstract

Section: Resultsmentioning

confidence: 99%

A Universal Scheme for Patterning of Oxides via Thermal Nanoimprint Lithography

Dinachali

Saifullah

Ganesan

et al. 2012

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The number of hydrolysable alkoxo groups decreases and additional coordination sites at the metal centers are blocked as a consequence of chelation. It was reported that the rate of hydrolysis and the extent of cross-linking in the formed network are decreased as a result of chelation [32]. Kessler et al [33] stated that hydrolysis and polycondensation reactions of metal alkoxides facilitated by the chemical modification and their kinetics have no direct relation to the sol-gel transformation.…”

Section: Polymeric Solsmentioning

confidence: 99%

Sol–gel derived mesoporous and microporous alumina membranes

Topuz

Çiftçioğlu

2010

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Stable polymeric and colloidal boehmite sols were prepared by sol-gel process through controlled hydrolysis/condensation reactions. The particle sizes of the colloidal sols were in the 12-25 nm range depending on the process parameters and about 2 nm for polymeric sols. The presence of a significant increase in the microporosity content of the heat treated polymeric membranes relative to the mesoporous colloidal membranes might make the design of thermally stable microporous alumina membranes with controlled pore structures possible. The phase structure evolution in the 600-800°C range had shown that the crystallization of the gamma alumina in the amorphous matrix starts at about 800°C. This indicated that the pore structure stability may be enhanced through processing up to this relatively high temperature in polymeric alumina derived unsupported membranes. The permeance values of the two and three layered colloidal alumina membranes were observed to be independent of pressure which implies that the dominant gas transport mechanism is Knudsen diffusion in these structures. This was also supported by the 2.8 nm BJH pore sizes of the colloidal membranes. The Knudsen diffusion equation derived permeances of the polymeric alumina membranes with thicknesses of about 300 nm were determined to be very close to the experimentally determined permeance values.

show abstract

“…HCl [9]. It could not exhibit instant gel formation with the addition of one drop of distilled water-ethanol mixture.…”

Section: Nano-structured Zirconia By Sol-gel Techniquementioning

confidence: 93%

“…There are various reports on the synthesis of nano-zirconia such as precipitation, hydrothermal synthesis, thermal decomposition and sol-gel technology, but sol-gel method is more advantageous because of its accomplishment with high purity, uniformity and homogeneity at lower sintering temperatures [8]. Being excessively hygroscopic in nature, obtaining nano-crystallites of ZrO 2 from zirconium alkoxides using the well-established sol-gel technology requires considerable attention and care because precipitation dominates over gelation [9]. Therefore, the moisture sensitivity of zirconium alkoxides could be retarded by substituting hydrolysable alkoxy groups with chelating ligands as modifiers [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectral characterization and crystal structure of a new precursor [(CH3COCHCOCH3)2Zr{C6H4(N=CHC6H4O)2}] for nano-zirconia: an investigation on the wettability of polyvinylidene fluoride–nano-zirconia composite material

Giri

Prasad

Tummalapalli

et al. 2015

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

A new octa-coordinated metallo-organic complex of zirconium (IV) [(CH 3 COCHCOCH 3 ) 2 Zr{C 6 H 4 (N=CHC 6 H 4 O) 2 }] was synthesized quantitatively by treating Zr(OPr i ) 4 ÁPr i OH with CH 3 COCH 2 COCH 3 and tetradentate Schiff's base ligand (L) [where L = {C 6 H 4 (N=CHC 6 H 4 OH) 2 }] in 1:2:1 stoichiometry in anhydrous refluxing toluene. The yellow solid complex was characterized by elemental analysis, FTIR, UV-visible, fluorescence and NMR ( 1 H and 13 C) spectra as well as by single-crystal XRD. The complex was processed to obtain nano-structured zirconia (ZrO 2 ) by sol-gel technique, and oxide ceramic was subjected to powder XRD, TEM and EDX analyses. Further, the same zirconia was employed in preparing superhydrophobic PVDF-nano-ZrO 2 composite coatings by spray coating method, and the effect of nano-oxide ceramic on the wettability of PVDF-nano-ZrO 2 composite coatings was studied systematically. The composite material was also characterized by FTIR and powder XRD.Electronic supplementary material The online version of this article (

show abstract

Modification of aluminum alkoxides with β-ketoesters: new insights into formation, structure and stability

Cited by 21 publications

References 13 publications

A Universal Scheme for Patterning of Oxides via Thermal Nanoimprint Lithography

A Universal Scheme for Patterning of Oxides via Thermal Nanoimprint Lithography

Sol–gel derived mesoporous and microporous alumina membranes

Synthesis, spectral characterization and crystal structure of a new precursor [(CH3COCHCOCH3)2Zr{C6H4(N=CHC6H4O)2}] for nano-zirconia: an investigation on the wettability of polyvinylidene fluoride–nano-zirconia composite material

Contact Info

Product

Resources

About