Synthesis, characterization and first application of new alumina hydrosols

Idrissi-Kandri, Noureddine; Ayral, A.; Guizard, C.; Ghadraoui, El Houcine El; Cot, L.

doi:10.1016/s0167-577x(99)00048-8

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…Colloidal 3-nm amorphous ZrO 2 nanoparticles were purchased from the Nyacol Corporation. Colloidal dispersions of 3-nm Al(OH) 3 nanoparticles were synthesized by the controlled neutralization of an aqueous solution of aluminum chloride with urea, according to a method described in reference [22]. These dispersions (pH 4.8) contained nanoparticles with a spherical morphology.…”

Section: Methodsmentioning

confidence: 99%

A General Method for the Synthesis of Nanostructured Large‐Surface‐Area Materials through the Self‐Assembly of Functionalized Nanoparticles

Chane‐Ching¹,

Cobo²,

Aubert³

et al. 2005

Chemistry A European J

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A general synthetic method for the preparation of nanostructured materials with large surface area was developed by using nanoparticle building blocks. The preparation route involves the self-assembly of functionalized nanoparticles in a liquid-crystal phase. These nanoparticles are functionalized by using difunctional amino acid species to provide suitable interactions with the template. Optimum interactions for self-assembly of the nanoparticles in the liquid-crystal phase were achieved with one -NH2 group anchored to the nanoparticle surface per 25 A(2). To maximize the surface area of these materials, the wall thicknesses are adjusted so that they are composed of a monolayer of nanoparticles. To form such materials, numerous parameters have to be controlled such as the relative volume fraction of the nanoparticles and the template and size matching between the hydrophilic component of the copolymer and nanoparticles. The surface functionalization renders our synthetic route independent of the nanoparticles and allows us to prepare a variety of nanostructured composite materials that consist of a juxtaposition of different discrete oxide nanoparticles. Examples of such materials include CeO2, ZrO2, and CeO2-Al(OH)3 composites.

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Section: Methodsmentioning

confidence: 99%

A General Method for the Synthesis of Nanostructured Large‐Surface‐Area Materials through the Self‐Assembly of Functionalized Nanoparticles

Chane‐Ching¹,

Cobo²,

Aubert³

et al. 2005

Chemistry A European J

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“…After deposition of the alumina nucleation centres into the polystyrene layer, a layer of inorganic coating was added through precipitation of aluminium hydroxide from an aqueous solution of aluminium chloride at 90°C, as described by Idrissi-Kandri et al 5 In brief, 1 g AlCl 3 .6H 2 O was dissolved in 50 mL of 2% ammonia solution, and the pretreated particles (5 g) were added. The mixture was heated to 90°C, and under continuous stirring, 20 mL of urea solution (45%) was added dropwise for 6 h. Under these conditions, aluminium hydroxide was precipitated, forming a uniform alumina layer on each particle.…”

Section: Methodsmentioning

confidence: 99%

Alumina coating of polyvinylidene fluoride (PVDF) surface in liquid phase

Liiv

Panov

Tenno

et al. 2014

Surface Engineering

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A two-step procedure is developed for preparing alumina coated polyvinylidene fluoride particles (diameter, ,100 mm) whose chemically inert and non-adhesive surface is initially grafted with polystyrene. The first coating step involves deposition of alumina precipitation centres into the polystyrene layer using the reaction of trimethylaluminium with a small residual amount of water retained within the porous brushy polystyrene structure after incomplete drying of the particles. The second coating step is performed through gentle precipitation of aluminium hydroxide from an aqueous aluminium chloride solution, with the alumina deposition being directed by the precipitation centres implanted during the first step. As a result of this process, the particles are covered uniformly with inorganic material. The quality and thickness of the final coating layer are controlled by the precipitation rate and stirring conditions.

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“…A 4 nm Al(OH) 3 colloidal dispersion containing Ba 2+ was prepared following a procedure previously described for the synthesis of Al(OH) 3 colloids, except for the addition of Ba(NO 3 ) 2 before the formation of the hydroxide gel by urea decomposition. A Ba/Al molar ratio of 0.095 was determined on the Ba 2+ −Al(OH) 3 dispersion after peptization of the hydroxide gel at pH 4.5 using diluted HNO 3 and subsequent purification by ultrafiltration.…”

Section: Methodsmentioning

confidence: 99%

“…Synthesis routes allowing control of morphology, size, and homodispersity of oxide nanocrystals have been largely developed using soft chemistry methods. Extensive studies on fabricating single-cation, , as well as binary or ternary oxides , involving mainly hydrothermal or solvothermal routes, have been achieved on nanocrystals in which structure crystallization occurs at relatively low temperatures, T < 500 °C. In contrast, a limited amount of work has contributed to the manufacture of complex oxide nanocrystals displaying structures such as spinel, garnet,and β-alumina type in which structure crystallization is performed in the high-temperature range, T > 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

Size and Morphology Control of Ultrafine Refractory Complex Oxide Crystals

et al. 2011

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High-temperature complex oxides are of considerable interest as their applications cover a broad spectrum from catalytic to optical technology. Indeed, new exciting opportunities might emerge if these high-temperature complex oxides, in which structure crystallization is achieved at temperatures T > 1000°C, could be synthesized as nonaggregated, ultrafine building blocks. In general, such refractory complex oxide particles are difficult to synthesize as ultrafine crystals because of the strong driving force available for sintering and coarsening in this high-temperature range. This paper reports a new synthetic process for the preparation of nonaggregated, ultrafine barium hexaaluminate, BaO, 6Al 2 O 3 , (BHA), and Ba 0.9 Eu 0.1 MgAl 10 O 17 , (BAM) crystals in which structure crystallization occurs around 1300°C. Our process is based on the Ba 2þ and Al 3þ ions hightemperature controlled diffusion from carbon-inorganic hybrid compounds prepared from soft chemistry routes. Control of morphology of these refractory complex aluminates displaying nanoplatelets morphology was achieved via the tailoring of high-temperature diffusion lengths of the various cations involved in the formation of these ultrafine refractory crystals.

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Synthesis, characterization and first application of new alumina hydrosols

Cited by 16 publications

References 9 publications

A General Method for the Synthesis of Nanostructured Large‐Surface‐Area Materials through the Self‐Assembly of Functionalized Nanoparticles

A General Method for the Synthesis of Nanostructured Large‐Surface‐Area Materials through the Self‐Assembly of Functionalized Nanoparticles

Alumina coating of polyvinylidene fluoride (PVDF) surface in liquid phase

Size and Morphology Control of Ultrafine Refractory Complex Oxide Crystals

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