Elaboration of porous silicon carbide by soft templating molecular precursors with semi-fluorinated alkanes

Nardin, Thibaud; Gouze, Benoît; Cambedouzou, Julien; Bauduin, Pierre; Man, Michel Wong Chi; Deschanels, Xavier; Bourgeois, Damien; Meyer, Daniel; Diat, Olivier

doi:10.1039/c4ta05996d

Cited by 20 publications

(12 citation statements)

References 56 publications

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“…PFAA are thus expected to display interesting interfacial behavior and the ability to self-assemble, either in pure form or in solvents selective to one of the segments. Indeed, PFAA are known to form a diversity of supramolecular nanostructures such as micelles, reverse micelles (1), smectic (layered) liquid crystalline phases (2)(3)(4)(5), mesophases, etc., all of which are potential candidates for numerous applications, from medicine (6)(7)(8)(9)(10)(11)(12) to smart materials and tailored interfaces (13)(14)(15)(16)(17). Organization in the solid state in layered structures has also been described (18)(19)(20)(21).…”

mentioning

confidence: 99%

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

Silva

Morgado

Lourenço

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Fully atomistic molecular-dynamics (MD) simulations of perfluoroalkylalkane molecules at the surface of water show the spontaneous formation of aggregates whose size and topography closely resemble the experimentally observed hemimicelles for this system. Furthermore, the grazing incidence X-ray diffraction (GIXD) pattern calculated from the simulation trajectories reproduces the experimental GIXD spectra previously obtained, fully validating the MD simulation results. The detailed analysis of the internal structure of the aggregates obtained by the MD simulations supports a definite rational explanation for the spontaneous formation, stability, size, and shape of perfluoroalkylalkane hemimicelles at the surface of water.

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mentioning

confidence: 99%

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

Silva

Morgado

Lourenço

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…Their morphology is depicted in Figure 4c. This reasonable assessment is inspired by some previous works on SFA aggregation [6,7,14,24], describing the formation of gels as the combination of flat objects so as to build the solid skeleton of the structure. The good agreement between experimental and simulated data tend to prove the validity of this model, enlightening the formation of larger flat objects made of ~150 F8H10 SFA in TSCH.…”

Section: / Aggregation Of Other Sfa In Cyclic Solventsmentioning

confidence: 99%

“…The structure of these gels was proposed to be made of F8H16 multi-branched ribbons among mixtures of hydrogenated or fluorinated solvents [5,7]. In a recent study, we took advantage of the morphology of this gel when the liquid phase is a silicon carbide (SiC) precursor molecule in order to produce soft-templated macroporous SiC [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Each molecule is made of 18 atoms including 12 hydrogen atoms and 6 atoms building the ring structure. However, in TSCH, 3 out of the 6 carbon atoms of CH have been substituted by silicon atoms, and therefore TSCH possesses assets for the preparation of SiC [14]. The molecular conformations of CH and TSCH are roughly the same, TSCH favor the chair one, showing slightly flattened angles with regards to CH because of silicon larger radii and longer Si-C bond (187 pm for Si-C against 154 pm for C-C) [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

Gouze

Nardin

Diat

et al. 2019

Colloid and Interface Science Communications

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Semifluorinated alkanes (SFA) are diblock molecules able to self-assemble in various organic media due to their fluorophilic/fluorophobic interactions. Such mixtures accordingly represent a model system for the further elaboration of soft-templated inorganic materials in totally anhydrous media. The aggregation behavior of four SFA species has been studied in two different organic and cyclic solvents in function of temperature by small angle X-ray scattering (SAXS). As long as the SFA-solvent mixtures remain in the liquid state, SAXS patterns reveal an aggregation behavior dependent on temperature and concentration, and on the internal structure of the SFA. We identify the relevant parameters governing the aggregation of these molecules based on the simulation of SAXS data versus temperature.

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“…Other parameters, i.e. the lattice strain (") generated in the deposited¯lms and crystallite size (D) are calculated using the following formulae: 24,25 …”

Section: Structural Propertiesmentioning

confidence: 99%

STRUCTURAL, MORPHOLOGICAL, ELECTRICAL AND MAGNETIC PROPERTIES OF NANOSTRUCTUREDCoFeTHIN FILMS PREPARED BY SPRAY PYROLYSIS DEPOSITION METHOD

2015

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Nanostructured CoFe thin¯lms were prepared on the glass substrates by spray pyrolysis deposition (SPD) method. The as-deposited¯lms were separately annealed at 500 C in ambient air and hydrogen atmospheres to investigate the e®ect of annealing atmosphere on di®erent properties of the deposited¯lms. Structural, morphological, magnetic and electrical properties of annealed thin lms were investigated by the X-ray di®ractometer (XRD), scanning electron microscope (SEM), vibrating sample magnetometer (VSM) and four-point probe measurements, respectively. XRD patterns show that by changing the annealing atmosphere from ambient air to hydrogen, the crystal structure transformed from cubic spinel phase (Fd-3m) to cubic CsCl-type phase (Pm-3m). SEM images demonstrated that the morphology, grain size and thickness of annealed thin¯lms depend greatly on the atmosphere type. Thickness of the¯lms annealed in ambient air and hydrogen atmosphere were 378 and 356 nm, respectively. The morphology of the¯lms changes from small sized granular for the ambient air-annealed¯lms to coral-like structures for the hydrogen atmosphere annealed¯lms. The magnetic properties of the annealed thin¯lms depend on the annealing atmosphere, the applied¯eld directions and¯lm microstructural properties. Hydrogen annealing induced a perpendicular magnetic anisotropy in CoFe thin¯lms. Room temperature hysteresis measurements show soft magnetic behavior of the hydrogen atmosphere annealed CoFe¯lms in the perpendicular direction suggested its application in perpendicular magnetic recording media.

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Elaboration of porous silicon carbide by soft templating molecular precursors with semi-fluorinated alkanes

Abstract: We present a novel soft templating approach (STA) for the elaboration of porous silicon carbide (SiC) in oxygen- and moisture-free atmospheres.

Cited by 20 publications

References 56 publications

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

Spontaneous self-assembly and structure of perfluoroalkylalkane surfactant hemimicelles by molecular dynamics simulations

Aggregation of semifluorinated alkanes in cyclic organic solvents: A SAXS study

STRUCTURAL, MORPHOLOGICAL, ELECTRICAL AND MAGNETIC PROPERTIES OF NANOSTRUCTUREDCoFeTHIN FILMS PREPARED BY SPRAY PYROLYSIS DEPOSITION METHOD

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