Synthesis of acicular goethite with surfactants

Frost, Ray L.; Zhu, Hua; Wu, Peter Z.; Boström, Thor E.

doi:10.1016/j.matlet.2005.02.072

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…Figure shows the ATR‐FTIR absorbance spectra of electrospun PVA fibers, α‐FeOOH nanowires and PVA/α‐FeOOH composite fibers in the range of 4,000–600 cm −1 . The goethite ATR‐FTIR spectrum agrees with literature data, with a strong intensity band at 884 cm −1 and 790 cm −1 caused by δ(O–H) deformation vibrations (in plane and out of‐plane bending) and a broad band at 3,133 cm −1 due to O–H stretching vibrations . The maximum of the band at 893 cm −1 and 792 cm −1 increased with the increasing content of goethite nanowires into the PVA matrix suggesting α‐FeOOH incorporation into the mat.…”

Section: Resultssupporting

confidence: 86%

Mechanical reinforcement of electrospun poly(vinyl alcohol) by α‐FeOOH nanowires

et al. 2016

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We report the mechanical performance of a-FeOOH nanowire reinforced poly(vinyl alcohol) (PVA) composite nanofiber mat, fabricated using straightforward aqueous processing methods. Goethite (a-FeOOH) nanocrystals have a high elastic modulus and -OH rich surface, ensuring strong interactions with hydrophilic polymers and effective reinforcement. Needle-less electrospinning resulted in alignment of the nanowires along fibre axis, as confirmed by transmittance electron microscopy studies. Produced composite PVA nanofibers containing 10 wt% goethite nanoparticles exhibited an outstanding fivefold increase in Young's modulus and 2.5-fold improvement of tensile strength compared to mats of neat PVA. The addition of a-FeOOH had a significant influence on glass transition temperature indicating formation of interphase regions around nanowire inclusions. Observed properties are explained by nanowire grafting in the precursor solution, extensive interactions between the adsorbed PVA chains and the matrix and percolation of interphase regions at 10 wt% a-FeOOH. POLYM. COMPOS., 39:2461-2468

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Section: Resultssupporting

confidence: 86%

Mechanical reinforcement of electrospun poly(vinyl alcohol) by α‐FeOOH nanowires

et al. 2016

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“…Mesoporous catalysts have large active surface area, good mechanical hardness, and very good hydrodynamic parameters for the contact with liquid phase [4][5][6][7][8][9]. Commonly mesoporous catalysts based on silica and even metal oxides are formed exploiting self-assembly of large organic surfactant or block copolymer molecules [4][5][6][7][8][9]. For metal oxide-based mesoporous solids an alternative to this approach are provided by self-assembly mechanisms guiding the aggregation of the primary oxometallate particles, MTSALs [10,11].…”

Section: Introductionmentioning

confidence: 99%

Controlling micro- and nanostructure and activity of the NaAlO2 biodiesel transesterification catalyst by its dissolution in a mesoporous γ-Al2O3-matrix

Агафонов

Yamanovskaya

Ivanov

et al. 2015

J Sol-Gel Sci Technol

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Mesoporous alumina and alumina-sodium aluminate composites were obtained by sol-gel method using polyethyleneimine as template. New approach for the regulation of the micro-and nanostructure of the composites as catalytic materials was proposed, exploiting inorganic seeds for the control of morphology for the produced nanostructures. Composition and temperature window for preventing the leaching of sodium aluminate in the course of reaction and thus drastically improving the catalytic activity has been identified. Structure and phase composition of the thus obtained catalytic materials were characterized using X-ray diffraction, N 2 adsorption/ desorption, FTIR spectra, scanning electron microscopy, and thermal analysis. New type of catalyst has shown high efficiency in the vegetable oil transesterification process under mild conditions opening prospects for small-scale production of reasonably good-quality biodiesel fuel. Graphical Abstract Dissolving sodium aluminate in the alumina matrix at proper compositions and under controlled temperatures permits to drastically decrease the leaching of aluminate and maintain its high catalytic activity in transesterification of vegetable oils with methanol.

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“…The mixing of the nanorods and the lamellar phase presumably leads to an energy gain owing to the formation of hydrogen bonds between the hydrated surface of the particles and the surfactant heads. 26 At this point, we have no convincing explanation for the threshold value of the repeat distance. The most plausible connection is that, as the lamellar phase becomes more concentrated, its elastic moduli increase and so does the interaction between particles, 3 to the point of inducing aggregation.…”

Section: Phase Diagram Of the Doped Systemmentioning

confidence: 86%

Magnetic Nanorods Confined in a Lamellar Lyotropic Phase

et al. 2008

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The dilute lamellar phase of the nonionic surfactant C 12EO 5 was doped with goethite (iron oxide) nanorods up to a fraction of 5 vol %. The interaction between the inclusions and the host phase was studied by polarized optical microscopy (with or without an applied magnetic field) and by small-angle X-ray scattering. We find that, when the orientation of the nanorods is modified using the magnetic field, the texture of the lamellar phase changes accordingly; one can thus induce a homeotropic-planar reorientation transition. On the other hand, the lamellar phase induces an attractive interaction between the nanorods. In more concentrated lamellar phases (under stronger confinement) the particles form aggregates. This behavior is not encountered for a similar system doped with spherical particles, emphasizing the role of particle shape in the interaction between doping particles and the host phase.

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Synthesis of acicular goethite with surfactants

Cited by 25 publications

References 11 publications

Mechanical reinforcement of electrospun poly(vinyl alcohol) by α‐FeOOH nanowires

Mechanical reinforcement of electrospun poly(vinyl alcohol) by α‐FeOOH nanowires

Controlling micro- and nanostructure and activity of the NaAlO2 biodiesel transesterification catalyst by its dissolution in a mesoporous γ-Al2O3-matrix

Magnetic Nanorods Confined in a Lamellar Lyotropic Phase

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