Mesoporous Aluminophosphate Thin Films with Cubic Pore Arrangement

Mazaj, Matjaž; Costacurta, Stefano; Logar, Nataša Zabukovec; Mali, Gregor; Tušar, Nataša Novak; Innocenzi, Plinio; Malfatti, Luca; Thibault-Starzyk, Frédéric; Amenitsch, Heinz; Kaučič, Venceslav; Soler-Illia, Galo J. A. A.

doi:10.1021/la7035746

Cited by 18 publications

(13 citation statements)

References 40 publications

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“…N 2 -BET analysis on powders prepared by drying cast solutions (i.e., xerogels) do not provide accurate pore volume or size values, due to differences in drying and contraction between supported and non-supported mesoporous samples, which present a different evolution of the inorganic condensation upon thermal treatment. 80,81 Ellipsometry (E) is a reliable optical technique for film characterization that permits determination of film thickness and refractive index, n(l). Ellipsometric porosimetry (EP) has been developed to assess the porosity of mesoporous thin films.…”

Section: Determination Of Film Porosity: Ellipsometric Porosimetry (E...mentioning

confidence: 99%

Critical aspects in the production of periodically ordered mesoporous titania thin films

et al. 2012

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Periodically ordered mesoporous titania thin films (MTTF) present a high surface area, controlled porosity in the 2-20 nm pore diameter range and an amorphous or crystalline inorganic framework. These materials are nowadays routinely prepared by combining soft chemistry and supramolecular templating. Photocatalytic transparent coatings and titania-based solar cells are the immediate promising applications. However, a wealth of new prospective uses have emerged on the horizon, such as advanced catalysts, perm-selective membranes, optical materials based on plasmonics and photonics, metamaterials, biomaterials or new magnetic nanocomposites. Current and novel applications rely on the ultimate control of the materials features such as pore size and geometry, surface functionality and wall structure. Even if a certain control of these characteristics has been provided by the methods reported so far, the needs for the next generation of MTTF require a deeper insight in the physical and chemical processes taking place in their preparation and processing. This article presents a critical discussion of these aspects. This discussion is essential to evolve from know-how to sound knowledge, aiming at a rational materials design of these fascinating systems.

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Section: Determination Of Film Porosity: Ellipsometric Porosimetry (E...mentioning

confidence: 99%

Critical aspects in the production of periodically ordered mesoporous titania thin films

et al. 2012

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“…Hereafter this is called the in situ set-up (static). 8,[10][11][12][13][36][37][38][39][40][41][42] The in operando dynamic set-up (eventually combined with mass spectrometry or GC (TCD detector) of the output gases or TGA 43 ) is suitable for investigations in operando conditions, 34,[44][45][46] allowing observation of the formation/ consumption of products/reactants as a function of: (i) sample temperature, (ii) gas space velocity and (iii) time after gas switching (pulse approach, able to investigate activation, reaction and diffusion phenomena) as the sample is directly held in the heating compartment or on the sample heating holder (DRS). Very recently, an improved micro-reactor cell for IR spectroscopic studies of heterogeneous catalysis was built around a 5.8 GHz microwave cavity.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fe sites in Fe-zeolites by FTIR spectroscopy of adsorbed NO: are the spectra obtained in static vacuum and dynamic flow set-ups comparable?

Berlier

Lamberti

Rivallan

et al. 2010

Phys. Chem. Chem. Phys.

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The present paper shows a direct comparison of IR spectra of adsorbed NO on two catalyst systems (Fe-silicalite and Fe-ZSM-5), recorded in a flow-through cell (in operando, where NO is carried by an excess of inert gas) and static cell (in situ, where a given pure NO equilibrium pressure is dosed). A progressive NO poly-adsorption is observed in the static cell upon increasing the NO equilibrium pressure (from Fe(2+)...(NO)(2) to Fe(2+)...(NO)(3)), while predominantly Fe(2+)...NO adducts are observed in the flow-through cell. By comparing literature spectra, it is shown that these spectral differences are intrinsically inherent to the two different experimental approaches. The two experimental set-ups are able to observe preferentially only a part of the total Fe species present on Fe-zeolites. Water contamination experiments employing different experimental conditions (order of dosage, co-dosage, different NO/H(2)O ratios) did not reproduce in the static environment the IR spectra collected with the dynamic set-up. The spectral differences could have a thermodynamic origin and be related to different adsorption enthalpies of mono- and di-nitrosyl complexes of the two Fe(2+) families and to the different NO partial pressure adopted in the two experimental configurations. These considerations have important consequences for the conclusions reached by different research groups on the structure of active Fe sites.

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“…To date, there have been few reports on the morphological design of mesoporous AlPO‐based materials, which have been limited to transparent films 29. 30 As a result, we claimed in this study that AlPO spheres with uniform, periodic mesopores were prepared for the first time, and therefore we can compare the difference between the synthetic conditions of the AOP and AlPO systems, as discussed later.…”

Section: Resultsmentioning

confidence: 89%

General Information to Obtain Spherical Particles with Ordered Mesoporous Structures

Kimura¹,

Yamauchi²

2012

Chemistry An Asian Journal

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Conditions for the synthesis of aluminum organophosphonate (AOP) and aluminophosphate (AlPO) spheres containing periodic mesopores were optimized and demonstrated to be general morphological controls for the surfactant-assisted synthesis of mesoporous materials. High-quality AOP and AlPO spheres with uniform mesopores were obtained at low and high temperatures, respectively. The aerosol-assisted synthesis of materials with uniform mesopores was categorized by using the difference in relative density of soluble AOP and AlPO oligomers that interact with ethylene oxide (EO) units in EO(n)PO(m)EO(n) triblock copolymer (PO=propylene oxide). Then, ordered mesoporous structures are constructed with the adequate amount of species in resultant frameworks, and the number of interactive points in soluble species determines the resultant density of the frameworks after self-assembly. Consequently, temperature-dependent synthesis, which allows controlled infiltration of soluble species to match the density of resultant frameworks, is required for the formation of ordered mesoporous structures under morphological control.

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Mesoporous Aluminophosphate Thin Films with Cubic Pore Arrangement

Cited by 18 publications

References 40 publications

Critical aspects in the production of periodically ordered mesoporous titania thin films

Critical aspects in the production of periodically ordered mesoporous titania thin films

Characterization of Fe sites in Fe-zeolites by FTIR spectroscopy of adsorbed NO: are the spectra obtained in static vacuum and dynamic flow set-ups comparable?

General Information to Obtain Spherical Particles with Ordered Mesoporous Structures

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