Modifying the reactivity of a solid Lewis acid: niobium and antimony doped nanoscopic aluminum fluoride

2018 ◽  
Vol 8 (12) ◽  
pp. 3151-3159 ◽  
Author(s):  
C. P. Marshall ◽  
T. Braun ◽  
E. Kemnitz
Keyword(s):  
Lewis Acid ◽  
High Surface ◽  
Sol Gel ◽  
Acid Catalysts ◽  
Aluminum Fluoride ◽  
Aluminium Fluoride ◽  
Sol Gel Synthesis

A series of acid catalysts were prepared, using niobium and antimony as dopants in the fluorolytic sol–gel synthesis of high surface aluminium fluoride.

Coupling Sol-Gel Synthesis and Microwave-Assisted Techniques: A New Route from Amorphous to Crystalline High-Surface-Area Aluminium Fluoride

2008 ◽  
Vol 14 (20) ◽  
pp. 6205-6212 ◽  
Author(s):  
Damien Dambournet ◽  
Gehan Eltanamy ◽  
Alexandre Vimont ◽  
Jean-Claude Lavalley ◽  
Jean-Michel Goupil ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Microwave Assisted ◽  
Aluminium Fluoride ◽  
Sol Gel Synthesis

Processing of Cr doped SrTiO3 nanoparticles into high surface area aerogels and thin films

2017 ◽  
Vol 1 (8) ◽  
pp. 1662-1667 ◽  
Author(s):  
Felix Rechberger ◽  
Gabriele Ilari ◽  
Christoph Willa ◽  
Elena Tervoort ◽  
Markus Niederberger
Keyword(s):  
Thin Films ◽  
Acetic Acid ◽  
Surface Area ◽  
Surface Functionalization ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Sol Gel Synthesis ◽  
Concentrated Dispersions

We present the nonaqueous sol–gel synthesis of crystalline SrTi1−xCrxO3 (x = 0, 0.3, 2, 5, 10%) nanoparticles and their processing into highly concentrated dispersions in ethanol by surface functionalization with 2-[2-(2-methoxyethoxy) ethoxy] acetic acid (MEEAA).

scholarly journals Low-Temperature Sol-Gel Synthesis of Nitrogen-Doped Anatase/Brookite Biphasic Nanoparticles with High Surface Area and Visible-Light Performance

Catalysts ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 376 ◽  
Author(s):  
Liang Jiang ◽  
Yizhou Li ◽  
Haiyan Yang ◽  
Yepeng Yang ◽  
Jun Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nitrogen Doped ◽  
Sol Gel Synthesis

Real sol-gel synthesis of catalytically active aluminium fluoride

2006 ◽  
Vol 41 (3) ◽  
pp. 299-311 ◽  
Author(s):  
Stephan Rüdiger ◽  
Gehan Eltanany ◽  
Udo Groß ◽  
Erhard Kemnitz
Keyword(s):  
Sol Gel ◽  
Aluminium Fluoride ◽  
Catalytically Active ◽  
Sol Gel Synthesis

scholarly journals Green Synthesis of Hydrocalumite (CaAl-OH-LDH) from Ca(OH)2 and Al(OH)3 and the Parameters That Influence Its Formation and Speciation

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 672 ◽  
Author(s):  
Bianca R. Gevers ◽  
Frederick J.W.J. Labuschagné
Keyword(s):  
Reaction Time ◽  
Reaction Pathway ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Infrared Analysis ◽  
Reflectance Ftir ◽  
Morphological Differences ◽  
Co Precipitation ◽  
Sol Gel Synthesis

Hydrocalumite is a layered double hydroxide (LDH) that is finding increased application in numerous scientific fields. Typically, this material is produced through environmentally polluting methods such as co-precipitation, sol-gel synthesis and urea-hydrolysis. Here, the hydrothermal green (environmentally friendly) synthesis of hydrocalumite (CaAl-OH) from Ca(OH)2 and Al(OH)3 in water and the parameters that influence its formation are discussed. The parameters investigated include the reaction temperature, reaction time, molar calcium-to-aluminium ratio, the morphology/crystallinity of reactants used, mixing and the water-to-solids ratio. Hydrocalumite formation was favoured in all experiments, making up between approximately 50% and 85% of the final crystalline phases obtained. Factors that were found to encourage higher hydrocalumite purity include a low water-to-solids ratio, an increase in the reaction time, sufficient mixing, the use of amorphous Al(OH)3 with a high surface area, reaction at an adequate temperature and, most surprisingly, the use of a calcium-to-aluminium ratio that stoichiometrically favours katoite formation. X-ray diffraction (XRD) and Rietveld refinement were used to determine the composition and crystal structures of the materials formed. Scanning electron microscopy (SEM) was used to determine morphological differences and Fourier-transform infrared analysis with attenuated total reflectance (FTIR-ATR) was used to identify possible carbonate contamination, inter alia. While the synthesis was conducted in an inert environment, some carbonate contamination could not be avoided. A thorough discussion on the topic of carbonate contamination in the hydrothermal synthesis of hydrocalumite was given, and the route to improved conversion as well as the possible reaction pathway were discussed.

Novel Ferromagnetic Aerogel Composite Materials with Nanoparticles Formation and Chemistry in Response to Light

2005 ◽  
Vol 888 ◽  
Author(s):  
Chunhua Yao ◽  
Xipeng Liu ◽  
William M. Risen
Keyword(s):  
Metal Ion ◽  
Uv Light ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Smart Composites ◽  
Polymer Hybrid ◽  
Aerogel Composite ◽  
Hybrid Aerogels ◽  
Sol Gel Synthesis

ABSTRACTSmart composites based on ferromagnetic hybrid aerogels have been prepared. These novel materials change chemistry in response to light to form nanoparticles that react with compounds that are present in the environment of the aerogels. Thus, high surface area silica/functional polymer hybrid aerogels have been formed via sol-gel synthesis. They also can contain coordinated metal-ion species. They are reacted with Fe-precursors to form air stable ferromagnetic aerogels, which they are transformed into active particles themselves or by incorporation of additional metal ions. These active materials, which adhere to tissue, can be positioned magnetically within their environment. Once they are positioned, they can be transformed by UV light to form Au(0) nanoparticles which react with the molecules in their environment. The preparation and properties of these aerogels, their photochemistry and reaction with bio-molecules will be presented.

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