First in-situ SAXS studies of the mesostructuration of spherical silica and titania particles during spray-drying process

Boissière, Cédric; Grosso, David; Amenitsch, Heinz; Gibaud, Alain; Coupé, Aurélie; Baccile, Niki; Sánchez, Clément

doi:10.1039/b308694a

Cited by 65 publications

(75 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 105-107 , 112 , 113 ] For silica, organosilica, alumina, aluminosilicates, titania based mesoporous materials these chemical and processing parameters have been extensively studied through the use of both ex situ and in situ characterization techniques. [ 53 , 54 ] Indeed, Boissiere et al [ 53 ] have demonstrated for the fi rst time through in situ SAXS measurements that meso-organisation of spray dried SiO 2 and TiO 2 microparticles is determined by both chemical (concentration, hydrolysis ratio, ageing time) and processing parameters (drying time). The temperature start of the organisation is strongly dependant on these parameters, since droplet concentration and gas temperature governs the evaporation/diffusion and thus the time realated system local composition.…”

Section: Main Chemical and Processing Parameters Controlling Structurmentioning

confidence: 99%

“…When fi lms prepared by dip or spin coating at ambient temperature adopt 2D hexagonal, 3D hexagonal, 3D cubic or lamellar structures depending on the solution composition and the humidity of the evaporation atmosphere. This difference is likely to come from the evaporation conditions of spray drying which is achieved in a hot and dry atmosphere (structuration takes place at temperature near the boiling point of the solvent and is very fast if compared with fi lms structuration conditions) [ 53 ] and modifi es the thermodynamic pseudoequilibrium of the formed mesostructure. As a general trend, the EISA process starts at the droplet/air interface where inorganic and surfactant concentrations are the highest.…”

Section: Use Of a Single Structuring Agentmentioning

confidence: 99%

“…Determining the infl uence of organics on mesostructuration process is thus a diffi cult task which requires the use of complementary characterization techniques allowing: (i) the characterization of the sol (liquid-state 29 Si and SAXS) [105][106][107] (ii) the characterization of powders (solid-state 1 H, 13 C, 14 N, and 29 Si NMR, SAXS, XRD, TEM with microtomy preparation preferentially, SEM, nitrogen adsorption-desorption) [ 105-107 , 12 , 113 ] and (iii) in situ SAXS experiments. [ 53 ] The incorporation of hydrophilic or hydrophobic macromolecules induces two different phenomena depending on their molecular weight and/or their concentration. With oligomers, i.e.…”

Section: Infl Uence Of Organic Species On Formation Of Mesoporous Parmentioning

confidence: 99%

See 2 more Smart Citations

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Boissière¹,

Grosso²,

Chaumonnot³

et al. 2010

Advanced Materials

337

295

View full text Add to dashboard Cite

The major advances in the field of the designed construction of hierarchically structured porous inorganic or hybrid materials wherein multiscale texturation is obtained via the combination of aerosol or spray processing with sol-gel chemistry, self-assembly and multiple templating are the topic of this review. The available materials span a very large set of structures and chemical compositions (silicates, aluminates, transition metal oxides, nanocomposites including metallic or chalcogenides nanoparticles, hybrid organic-inorganic, biohybrids). The resulting materials are manifested as powders or smart coatings via aerosol-directed writing combine the intrinsic physical and chemical properties of the inorganic or hybrid matrices with defined multiscale porous networks having a tunable pore size and connectivity, high surface area and accessibility. Indeed the combination of soft chemical routes and spray processing provides "a wind of change" in the field of "advanced materials". These strategies give birth to a promising family of innovative materials with many actual and future potential applications in various domains such as catalysis, sensing, photonic and microelectronic devices, nano-ionics and energy, functional coatings, biomaterials, multifunctional therapeutic carriers, and microfluidics, among others.

show abstract

Section: Main Chemical and Processing Parameters Controlling Structurmentioning

confidence: 99%

Section: Use Of a Single Structuring Agentmentioning

confidence: 99%

Section: Infl Uence Of Organic Species On Formation Of Mesoporous Parmentioning

confidence: 99%

See 1 more Smart Citation

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Boissière¹,

Grosso²,

Chaumonnot³

et al. 2010

Advanced Materials

337

295

View full text Add to dashboard Cite

show abstract

“…In fact, the classical preparation process involves two main steps, precipitation and autoclaving, which are time consuming and for which operating parameters are rather difficult to control. During the last 10 years, other synthesis processes have been studied, especially processes involving Evaporation Induced Self-Assembly (EISA) [10][11][12]. However, to our knowledge, despite the very attractive potential of EISA to obtain mesostructured objects, this process has not yet been used to develop highly acidic aluminosilicate mesostructured solids.…”

Section: Mesostructured Aluminosilicate Materialsmentioning

confidence: 99%

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Chaumonnot

Tihay

Coupé

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

Self Cite

View full text Add to dashboard Cite

Résumé -Matériaux aluminosilicates innovants à porosité hiérarchisée obtenus par voie aérosol -Cet article met en évidence le fort potentiel d'un procédé d'atomisation (ou procédé aérosol) pour obtenir de nouvelles familles de solides aluminosilicates présentant une porosité hiérarchisée dans la gamme de la micro à la macroporosité. Il est ainsi possible d'obtenir, en une seule étape de synthèse, et grâce à un procédé fonctionnant en continu, des aluminosilicates mésostructurés à forte teneur en aluminium, des solides composites constitués de nanocristaux de zéolithe piégés dans une matrice mésostructurée et des aluminosilicates micro, méso et macroporeux présentant des propriétés catalytiques en craquage du cumène inédites. Ces résultats prometteurs ouvrent des perspectives intéressantes pour le développement de nouveaux supports acides pour des catalyseurs d'hydrocraquage. Abstract -New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

show abstract

“…As far as the last point is concerned, Boissière et al [5] used time-resolved in-situ SAXS to determine the required conditions for the mesophase to form. Regarding applications, spherical shaping and possibility to embed maghemite nanoparticles within a mesoporous silica matrix readily showed an interest in combined applications like drug delivery and magnetic resonance imaging [6] while catalysis was rather explored in presence of Pd nanoparticles [7] and nanowires [8].…”

mentioning

confidence: 99%

Core-shell effects of functionalized oxide nanoparticles inside long-range meso-ordered spray-dried silica spheres

Baccile

Fischer

Julián‐López

et al. 2008

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Core-shell and homogeneous distributions of functionalized cerium oxide nanoparticles within spraydried mesostructured silica spheres are achieved by modification of synthesis parameters such as the templating agent and nanoparticle capping functions.Keywords Mesoporous silica Á Embedded nanoparticles Á Functionalized nanoparticles Á Evaporation induced self assembly Á Spray-dryingIn the past 15 years a large number of studies has been focused on long-range ordered mesoporous materials obtained in solution through the self-assembly of a variety of amphiphilic templating agents with a growing inorganic phase [1]. Recently, several works showed that their well known structural characteristics (high surface area, tunable geometry of the porous network, narrow pore size distribution) [2] are preserved and enhanced by mean of a spray drying process, which revealed to be interesting for its ease and possibility to obtain spherical particles. In Refs. [2c, 3], experimental conditions as well as different structuring agents were succesfully tested while in Ref.[4] SAXS, TEM and mainly solid state NMR were used to better understand the process of particle and mesophase formation with time. As far as the last point is concerned, Boissière et al.[5] used time-resolved in-situ SAXS to determine the required conditions for the mesophase to form. Regarding applications, spherical shaping and possibility to embed maghemite nanoparticles within a mesoporous silica matrix readily showed an interest in combined applications like drug delivery and magnetic resonance imaging [6] while catalysis was rather explored in presence of Pd nanoparticles [7] and nanowires [8]. In these cases, the way in which nanoparticles are distributed inside the silica particles is of primary importance according to the final application. For instance, in catalytic application, one could hope to enhance interactions between external fluids and embedded nanoparticles by placing them in the silica surface rather than in its bulk. In this way, diffusion paths are limited to the external crust. On the contrary, if the application involves magnetic or optical properties, an homogenous distribution within the silica bulk is required in order to avoid destructive interactions (magnetic coupling, optical quenching…) origined from clustering of nanoparticles.For these reasons, we want to show the possibility of tuning the spatial distribution of plain and functionalized cerium oxide nanoparticles inside spherical mesostructured silica particles produced by the spray-driyng technique. The goal is double: firstly we would like to show some tricky interactions effects between functionalized Electronic supplementary material The online version of this article

show abstract

First in-situ SAXS studies of the mesostructuration of spherical silica and titania particles during spray-drying process

Abstract: Meso-organisation of SiO2 and TiO2 particles prepared by spray drying have been for the first time analysed through in-situ SAXS. Both processing and chemical parameters are critical to obtain meso-organised spheres.

Cited by 65 publications

References 8 publications

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials

New Aluminosilicate Materials with Hierarchical Porosity Generated by Aerosol Process

Core-shell effects of functionalized oxide nanoparticles inside long-range meso-ordered spray-dried silica spheres

Contact Info

Product

Resources

About