scholarly journals Non-aqueous cross hydrolysis: an epoxide-free sol-gel route toward highly porous alumina monoliths

2021 ◽  
Author(s):  
Simon Carstens ◽  
Igor Atanasov ◽  
Tim Jähnichen ◽  
Bastian Oberleiter ◽  
Dirk Enke
Keyword(s):  
Porous Alumina ◽  
Sol Gel ◽  
Aluminum Salt ◽  
Crystal Water ◽  
Mechanical Stabilization ◽  
Novel Approach ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of ◽  
Highly Porous

AbstractHighly porous alumina monoliths can be fabricated by simultaneous hydrolysis of aluminum alkoxides and salts as homonuclear precursors. The use of carcinogenic epoxides can thus be avoided. In this novel approach, no water is added to the system but hydrolysis is induced by the crystal water of the aluminum salt. Mechanical stabilization and significantly increased porosity values can be achieved when the sol-gel synthesis is performed in an autoclave.

scholarly journals 1D TiO2 Nanostructures Prepared from Seeds Presenting Tailored TiO2 Crystalline Phases and Their Photocatalytic Activity for Escherichia coli in Water

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Julieta Cabrera ◽  
Dwight Acosta ◽  
Alcides López ◽  
Roberto J. Candal ◽  
Claudia Marchi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Photocatalytic Activity ◽  
Bactericidal Activity ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
E Coli ◽  
1D Nanostructures ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of ◽  
Tio2 Nanostructures

TiO2 nanotubes were synthesized by alkaline hydrothermal treatment of TiO2 nanoparticles with a controlled proportion of anatase and rutile. Tailoring of TiO2 phases was achieved by adjusting the pH and type of acid used in the hydrolysis of titanium isopropoxide (first step in the sol-gel synthesis). The anatase proportion in the precursor nanoparticles was in the 3–100% range. Tube-like nanostructures were obtained with an anatase percentage of 18 or higher while flake-like shapes were obtained when rutile was dominant in the seed. After annealing at 400°C for 2 h, a fraction of nanotubes was conserved in all the samples but, depending on the anatase/rutile ratio in the starting material, spherical and rod-shaped structures were also observed. The photocatalytic activity of 1D nanostructures was evaluated by measuring the deactivation of E. coli in stirred water in the dark and under UV-A/B irradiation. Results show that in addition to the bactericidal activity of TiO2 under UV-A illumination, under dark conditions, the decrease in bacteria viability is ascribed to mechanical stress due to stirring.

scholarly journals Polysilsesquioxanes Through Base-Catalyzed Redistribution of Oligohydridosiloxanes

2000 ◽  
Vol 628 ◽  
Author(s):  
Kamyar Rahimian ◽  
Roger A. Assink ◽  
David P. Lang ◽  
Douglas A. Loy
Keyword(s):  
Organic Solvents ◽  
Sol Gel ◽  
Base Catalysts ◽  
Ceramic Precursors ◽  
Sol Gel Synthesis ◽  
Low K ◽  
Hydrolysis Of

Organopolysilsesquioxanes have recently gained much interest as materials for low-K dielectrics [1], ceramic precursors [2] and photoresists [3]. Typical sol-gel synthesis of polysilsesquioxanes involves the hydrolysis of organotricholorosilanes and/or organotrialkoxysilanes in the presence of acid or base catalysts and organic solvents. However, under sol-gel conditions most organotrialkoxysilanes do not afford silsesquioxane gels. This limits the range of organic functionalities that can be introduced into these hybrid organicinorganic materials.

Sol-gel synthesis of titanum dioxide by hydrolysis of titanium glycerolates and peroxides

2013 ◽  
Vol 39 (4) ◽  
pp. 398-402 ◽  
Author(s):  
V. A. Osipova ◽  
G. S. Zakharova ◽  
E. I. Andreikov ◽  
Yu. G. Yatluk ◽  
I. S. Puzyrev
Keyword(s):  
Sol Gel ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of

Sol–gel synthesis of an array of C70 single crystal nanowires in a porous alumina template

2001 ◽  
pp. 541-542 ◽  
Author(s):  
Huaqiang Cao ◽  
Zheng Xu ◽  
Xianwen Wei ◽  
Xiang Ma ◽  
Ziling Xue
Keyword(s):  
Single Crystal ◽  
Porous Alumina ◽  
Sol Gel ◽  
Alumina Template ◽  
Porous Alumina Template ◽  
Sol Gel Synthesis

Novel approach for sol–gel synthesis of nanosize aluminium titanate

2013 ◽  
Vol 18 (3) ◽  
pp. 235-240 ◽  
Author(s):  
M. Sharma ◽  
D. K. Singh ◽  
R. K. Upadhyay ◽  
M. S. Yadav ◽  
S. S. Amritphale ◽  
...  
Keyword(s):  
Sol Gel ◽  
Aluminium Titanate ◽  
Novel Approach ◽  
Sol Gel Synthesis

Sol-gel Synthesis of LaAlO3; Epitaxial Growth of LaAlO3 Thin Films on SrTiO3(100)

1997 ◽  
Vol 12 (4) ◽  
pp. 1017-1021 ◽  
Author(s):  
Shara S. Shoup ◽  
Mariappan Paranthaman ◽  
David B. Beach ◽  
E. D. Specht ◽  
Robert K. Williams
Keyword(s):  
Ligand Exchange ◽  
Sol Gel ◽  
Precursor Solution ◽  
Epitaxial Films ◽  
Full Width ◽  
Annealing Furnace ◽  
Rocking Curve ◽  
X Ray ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of

A LaAlO3 precursor solution was prepared via an all alkoxide sol-gel route. The solution of lanthanum methoxyethoxide and aluminum methoxyethoxide in 2-methoxyethanol was prepared via ligand exchange starting from lanthanum isopropoxide and aluminum sec-butoxide and was used to make both LaAlO3 powders and films. Complete hydrolysis of the solution formed a gel that yielded well-crystallized LaAlO3 powders when fired in air at 800 °C. A partially hydrolyzed solution was spun-cast on SrTiO3 (100) single crystal substrates. Epitaxial films of LaAlO3 were subsequently formed during pyrolysis in O2 at 800 °C in a rapid thermal annealing furnace for a total of 8 min. The films were strongly c-axis oriented, verified by x-ray rocking curve results from the (003) plane with full-width at half-maximum (FWHM) = 0.87°, and had good in-plane texture shown by a φ scan of the (202) plane with FWHM = 1.07°.

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