Integrative chemistry portfolio toward designing and tuning vanadium oxide macroscopic fibers sensing and mechanical properties

Brun, Nicolas; Leroy, Céline M.; Dexmer, Julien; Serier, Hélène; Carn, Florent; Biette, Lahire; Backov, Rénal

doi:10.1016/j.crci.2009.01.007

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…It is, indeed, in this vein that the NSF did rely later on this interdisciplinary approach of materials science, under its Integrative Chemistry Activity (ICA) program. We have recently proposed titania macroscopic fiber generation achieved by an extrusion process in the same way as the generation of vanadium oxide − and zinc oxide macroscopic composite fibers . We demonstrated that the specific 1D shape design and surface mesocopic roughness of various nanoporous titania fibers can actually influence the photocatalytic properties, determined by gaseous acetone mineralization (i.e., decomposition into CO 2 and H 2 O) in a specially designed reactor under unidirectional gas flow.…”

Section: Introductionmentioning

confidence: 99%

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

Kinadjian

Béchec

Henrist

et al. 2014

ACS Appl. Mater. Interfaces

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In a context of volatile organic compound photodecomposition, we have addressed TiO2-based macroscoscpic fiber generation. We have extruded hybrid sols of amorphous titania nanoparticles, latex nanoparticles, and nonionic surfactant (Tergitol) as structure-directing agents into a poly(vinyl alcohol) (PVA) solution bearing salts acting as a flocculating medium. The resulting nanocomposite TiO2/latex/PVA macroscopic fibers were thermally treated in air to open porosity by organic removal while generating the photocatalytically active anatase phase of TiO2 along with residual brookite. Considering the synthetic paths, we have varied both the diameter of the latex particles as well as their concentration within the starting sol. These parameters allow tuning both the voids created through the applied thermal treatment and the fiber final diameters. For gas-phase photocatalysis, we have shown that the fiber diameters, mesoscopic roughness, and macroscopic topological defects represent indeed important morphological parameters acting cooperatively toward both acetone degradation and its mineralization processes. Particularly, triggering the fiber morphological characteristics, we have increased their efficiency toward acetone degradation of around 550% when compared with previous work.

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Section: Introductionmentioning

confidence: 99%

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

Kinadjian

Béchec

Henrist

et al. 2014

ACS Appl. Mater. Interfaces

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“…The insertion of latex particles as template in the starting solution was shown to be useless, as it did not create supplementary macroscopic voids within the structure: the striation induced already a macroscopic porosity about several hundred of nanometers and latex inclusion prevented the correct alignment of the PVA chains during the spinning process, causing a distortion of the striation and possibly resulting in a lower air–solid contact time. Thanks to a reduced diameter, the new fibers are in average three times more efficient than the fibers presented in previous work with still high mineralization rate …”

Section: Resultsmentioning

confidence: 80%

“…By contrast, conventional wet spinning can be scaled up and is actually already used for the industrial production of several synthetic fibers. This approach based on the injection and coagulation of fiber material dispersed in a liquid has already been employed in our group for the generation of macroscopic carbon nanotube fibers for actuators, titania fibers for photocatalysis, vanadium oxide for gas sensors, and zinc oxide fibers dedicated to photonics . In the case of vanadium oxide fibers, it was demonstrated that: (i) the inclusion of latex particles influences the PVA chains alignment, (ii) the alignment of the PVA chains and the nano‐ribbons along the fiber main axis has an impact on the fiber mesoscopic organization, and (iii) the mesoscopic organization modifies the detection of alcohol vapor.…”

Section: Introductionmentioning

confidence: 99%

TiO₂ Macroscopic Fibers with Enhanced Photocatalytic Properties Obtained through a Scale‐Up Semi‐Industrial Process

et al. 2014

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We describe the generation and properties of TiO 2 -based macroscopic fibers designed for the photodecomposition of volatile organic compounds (VOC). We made use of a continuous industrially scalable extrusion process employing hybrid sols of amorphous titania nanoparticles, polyvinyl alcohol (PVA), and optionally latex nanoparticles. This process allowed for the continuous generation of hybrid TiO 2 /latex/PVA or TiO 2 /PVA macroscopic fibers. Upon thermal treatment in air, we obtained biphasic porous fibers containing the anatase phase of TiO 2 with 10-15% of brookite. These fibers, which can be manufactured as several hundred meters of length reels, provide significantly improved phototocatalytic efficiency compared to our previous work. Their efficiency is now comparable to the commercial Quartzel 1 PCO photocatalyst for gas-phase acetone mineralization.

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ZnO/PVA Macroscopic Fibers Bearing Anisotropic Photonic Properties

Kinadjian

Achard

Julián‐López

et al. 2012

Adv Funct Materials

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Composite PVA/ZnO‐nanorods fibers, synthesized through co‐axial flux extrusion exhibit higher anisotropic photonic properties, both in absorption and emission, as a result of the collective alignment of the ZnO nanorods along the main axis of the PVA fiber. This photonic anisotropy is triggered by a synergistic interaction between the PVA matrix, stretched above the glass transition temperature (Tg), and cooled down under strain. Compared with non‐elongated fibers that present an isotropic emission, composite fibers previously submitted to a tensile stress absorb selectively UV emission when the polarized laser beam is parallel to the main axis of the fiber. In addition, their photolumincescence is also anisotropic, with a waveguide behavior along the main axis of the fiber. Mechanical properties of these composite fibers are also drastically improved, compared with pure PVA fibers: the longitudinal Young modulus of these fibers is increased from 2 to 6 GPa upon ZnO addition, a value similar to those already observed for composite fibers, prepared either with carbon nanotubes, or V2O5 macroscopic fibers.

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Integrative chemistry portfolio toward designing and tuning vanadium oxide macroscopic fibers sensing and mechanical properties

Cited by 7 publications

References 43 publications

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

TiO₂ Macroscopic Fibers with Enhanced Photocatalytic Properties Obtained through a Scale‐Up Semi‐Industrial Process

ZnO/PVA Macroscopic Fibers Bearing Anisotropic Photonic Properties

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Integrative chemistry portfolio toward designing and tuning vanadium oxide macroscopic fibers sensing and mechanical properties

Cited by 7 publications

References 43 publications

Varying TiO2 Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

Varying TiO2 Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

TiO2 Macroscopic Fibers with Enhanced Photocatalytic Properties Obtained through a Scale‐Up Semi‐Industrial Process

ZnO/PVA Macroscopic Fibers Bearing Anisotropic Photonic Properties

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Product

Resources

About

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

Varying TiO₂ Macroscopic Fiber Morphologies toward Tuning Their Photocatalytic Properties

TiO₂ Macroscopic Fibers with Enhanced Photocatalytic Properties Obtained through a Scale‐Up Semi‐Industrial Process