References of "Heinrichs, Benoît"
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See detailUp-scaling of hydrophilic water-based coatings for easy-to-clean and anti-staining applications
Daniel, Alain; Wicky, David; Le Craz, Sébastien et al

Poster (2017)

Easy-to-clean surfaces can be obtained by the deposition of thin coatings presenting either superhydrophilic or superhydrophobic properties. A wide range of coatings and associated deposition technologies ... [more ▼]

Easy-to-clean surfaces can be obtained by the deposition of thin coatings presenting either superhydrophilic or superhydrophobic properties. A wide range of coatings and associated deposition technologies has been studied in the past years to elaborate such kind of coatings and promote surface cleaning by water. When considering industrial use, some important criteria must be taken into account including ease of processing and speed, coating robustness and durability, aesthetic, product toxicity and cost. This presentation deals with the elaboration at industrial scale of hydrophilic easy-to-clean and anti-staining layers on prepainted steel. This metallic material, used for building applications, is sensitive to environmental fouling occurring over the time and leading to inaesthetic dirtying of the surface. The solution studied in this work is based on a nanometric coating constituted of SiO2 which increases surface hydrophilicity and prevents from dust embedding in the paint. Thanks to the combination of these effects, the preservation of the initial surface aspect is highly improved over the time. Moreover, when an anatase TiO2 top layer is deposited on the SiO2 coating, an additional photocatalytic effect can be measured. Both SiO2 and TiO2 layers are deposited from aqueous colloidal solutions that fit with industrial requirements and tools. Their properties are described in term of easy-cleaning and anti-staining effects through water contact angle measurements, accelerated staining tests and natural outdoor exposure, on prototypes elaborated at industrial scale in a roll-to-roll process. The coating robustness and the durability of the properties are validated after accelerated ageing tests, including corrosion and UV resistances, and after mechanical deformation. [less ▲]

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See detailElectrochemical performances of Li4Mn5O12 prepared by spraycoating assisted Sol-Gel reaction
Alié, Christelle ULiege; Pàez Martinez, Carlos ULiege; Calberg, Cédric ULiege et al

Poster (2017)

There is an intense interest in the battery industry to identify ways to improve the cathodes used in terms of energy, power, safety, life, and cost. Li4Mn5O12 has attracted great interest as a potential ... [more ▼]

There is an intense interest in the battery industry to identify ways to improve the cathodes used in terms of energy, power, safety, life, and cost. Li4Mn5O12 has attracted great interest as a potential 3V cathode material for rechargeable Li batteries in recent years, due to its high specific capacity of 163 mAh/g in the 3V region. Li4Mn5O12 is conventionally synthesized via solid-state reaction where the high temperature needed makes it difficult to obtain stoichiometric Li4Mn5O12 and the solid-state reaction gives a solid that needs to be mixed with a carbon source and a binder for electrochemical characterization and application. The fabrication of thin film rechargeable lithium batteries by a Sol-Gel method combined with spray-coating technique is expected to achieve both simplification and cost reduction of fabrication process by direct deposition of the active material on the electrode during its synthesis. A precursor sol of LiCH3COO.2H2O:Mn(CH3COO)2.4H2O (4:5) and L-lysine (total metal ions:L-lysine 50:1) was sprayed onto steel coins repeatedly, dried at 280 °C by heat gun and converted to Li4Mn5O12 thin film by heating at 400 °C. This process was repeated till target mass was deposited. For a target battery capacity of 0.65 mAh, a deposit of 4 mg is necessary. The charge-discharge test of the Li/Li4Mn5O12 coin cell battery was carried out at different rates, 0.1 C to 2 C (1C = 163 mA/g), between 1.8 and 3.6V. It is important that the total capacity is close to theoretical value and stable with cycling. The table below on the evolution of the capacity with the cycles at different rates shows that even at a medium rate of C/2, the capacity decreases by 10 % after 70 cycles, result which is better than those observed in the literature [1-3] but not good enough for applications. Doping of the sol with TiO2 before spray coating is necessary to improve electrochemical performances. The figure below shows the charge-discharge curves of the TiO2-doped Li4Mn5O12 at different rates. During the successive cycles, the discharge and charge decrease only slightly at a given rate, demonstrating the high-degree stable discharge plateau at 2.8 V. Very good capacities are obtained for rates ≤ 1C but for higher rates, kinetic problems appear and part of the lithium does not take part to the insertion-extraction process, even with TiO2 doping. In the potential range of 3.6-1.8 V, TiO2-doped Li4Mn5O12 still display very good electrochemical properties in respect of the capacity (high capacity values), capacity retention (stability) and rate capability (high capacity and stability at medium rates) as shown in the table below. [less ▲]

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See detailStudy of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous Sol-Gel processing
Pirard, Sophie ULiege; Malengreaux, Charline; Léonard, Géraldine et al

Poster (2017)

An aqueous Sol-Gel process, previously developed for producing undoped and Cu2+, Ni2+, Zn2+ or Pb2+ doped TiO2 photocatalysts with remarkably high photocatalytic activity without requiring any calcination ... [more ▼]

An aqueous Sol-Gel process, previously developed for producing undoped and Cu2+, Ni2+, Zn2+ or Pb2+ doped TiO2 photocatalysts with remarkably high photocatalytic activity without requiring any calcination step, has been adapted to produce Fe3+, Cr3+, La3+ or Eu3+ single-doped TiO2 photocatalysts as well as La3+-Fe3+ and Eu3+-Fe3+ co-doped TiO2 catalysts. The physicochemical properties of the obtained catalysts have been characterized using a suite of complementary techniques, including ICP-AES, XRD, UV-Vis spectroscopy, nitrogen adsorption-desorption and Fe-57 Mössbauer. The active crystalline phase is obtained without requiring any calcination step and all the different catalysts are composed of nanocrystallites of anatase with a size of 6-7 nm and a high specific surface area varying from 181 to 298 m² g-1. In this study, the effect of the NO3:Ti(IV) mole ratio used to induce the peptisation reaction during the synthesis has been studied and the results revealed that this ratio can influence significantly the textural properties of the resulting catalyst. A screening of the photocatalytic activity of the undoped and Fe3+, Cr3+, La3+ or Eu3+ single-doped and codoped photocatalysts has been performed by evaluating the degradation of 4-nitrophenol under UV-Visible light (330 nm < λ < 800 nm). This study suggests that the photocatalytic activity is significantly influenced by the dopant nature and content with an optimal dopant content being observed in the case of Fe3+ or La3+ single-doped as well as in the case of La3+-Fe3+ and Eu3+-Fe3+ co-doped catalysts. In the case of Cr3+ singledoped catalysts, a detrimental effect of the dopant on the photocatalytic degradation of 4-nitrophenol has been observed while no significant influence of the dopant has been detected in the case of Eu3+ single-doped catalysts. The role of the different dopants in modulating the photocatalytic activity is discussed. [less ▲]

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See detailOrganic dyes anchoring in anatase photocatalysts to decontaminate water with solar light
Tasseroul, Ludivine; Pirard, Sophie ULiege; Lambert, Stéphanie ULiege et al

Conference (2017)

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See detailReactive extrusion of pharmaceutical grade PLLA
Regibeau, Nicolas ULiege; Tilkin, Rémi ULiege; Grandfils, Christian ULiege et al

Poster (2017)

During the 20th century, degradable aliphatic polyesters have undergone fast and dynamic developments. Nowadays, these materials can be found in several areas of human activities. Originally there have ... [more ▼]

During the 20th century, degradable aliphatic polyesters have undergone fast and dynamic developments. Nowadays, these materials can be found in several areas of human activities. Originally there have been first designed for the pharmaceutical and medical fields, in particular in surgery and for drug delivery systems. In these domains, polymers are synthesized according to a batch procedure due to the low capacity needed. This work is dedicated to the optimization of a continuous synthesis of pharmaceutical grade polyesters (e.g. poly-L-lactide, PLLA) by reactive extrusion using a twin screws extruder. This equipment presents several advantages compared to batch reactor such as: absence of solvent, high degree of mixing, easiness of scale-up, and rapid continuous synthesis. PLLA synthesis by reactive extrusion has been performed adopting a co-rotating twin-screws extruder (diameter=11 mm and L/D ratio=40). A highly active catalyst must be used to reach the target conversion due to the limited residence time. Tin octoate, approved by US Food and Drugs Administration, has been used alone as catalyst considering a catalyst / monomer molar ratio of 1/5000. A polyethylene glycol has been adopted as initiator. 1H.NMR and size exclusion chromatography (SEC) have been adopted to monitor the conversion rate of the monomer and to analyse the mean molecular weights and the corresponding polydispersity. Static mechanical tests have also carried out to assess the influence of residual monomer within the polymer. Our optimization study has highlighted that the main challenging aspects were the control of the reaction atmosphere and of the residence time. In the first case, even presence in trace water can competitively initiate the polymerization, but also promote hydrolysis. In order to reach a high monomer conversion (≥ 99 %), the residence time has to be well controlled and extended. This latter parameter is particularly affected by the screw configuration and the use of the protic initiator. In particular, the screw configuration was based on previous studies dedicated to the synthesis of polyesters by reactive extrusion [1, 2]. After synthesis, post-processing step was realized in order to reduce the monomer residue. Once optimized we have succeeded to reach in a reproducible way high molecular weight PLLA (typically in a range of 50 to 100 KDa) with a high monomer conversion (>96 %) on a time scale of some minutes. Post-polymerization has successfully decreased the residual monomer below 1%. In conclusion, this work provides a continuous and robust process to synthesize pharmaceutical grade PLLA by reactive extrusion. References : [less ▲]

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See detailAqueous sol-gel synthesis and film deposition methods for the large-scale manufacture of coated steel with self-cleaning properties
Mahy, Julien ULiege; Léonard, Géraldine ULiege; Pirard, Sophie ULiege et al

in Journal of Sol-Gel Science and Technology (2017), 81(1), 27-35

A process has been developed to enable the large scale production of pure TiO2 films deposited on 316L stainless steel in order to get an easy-to-clean surface. This large scale process requires an easy ... [more ▼]

A process has been developed to enable the large scale production of pure TiO2 films deposited on 316L stainless steel in order to get an easy-to-clean surface. This large scale process requires an easy aqueous sol-gel procedure for the synthesis of the TiO2 sol. This synthesis has been simplified to facilitate the extrapolation towards an industrial scale. Results of TEM, photocatalytic properties, film hydrophilicity, and texture obtained with the simplified aqueous sol-gel synthesis (IsoP-TiO2 synthesis) show similar properties to those obtained with the standard aqueous sol-gel synthesis of TiO2 (HAc-TiO2 synthesis) developed previously. Only X-Ray Diffraction patterns showed differences, with the presence of anatase-brookite phases in IsoP-TiO2 synthesis while anatase phase only was observed in HAc-TiO2 synthesis. Both the aqueous sol-gel synthesis of pure TiO2 and the film deposition on steel by roll-coating have been successfully extrapolated to a larger scale. The photocatalytic activity and the hydrophilicity of the film were found to be unchanged when compared to films produced at a laboratory scale, thus validating the production of an efficient easy-to-clean material. Although some problems are still to be solved, this study is a hopeful first step in the development of a large scale process for self-cleaning steel production. [less ▲]

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See detailStudy of the photocatalytic activity of Fe3+, Cr3+, La3+ and Eu3+ single-doped and co-doped TiO2 catalysts produced by aqueous sol-gel processing
Malengreaux, Charline; Pirard, Sophie ULiege; Léonard, Géraldine ULiege et al

in Journal of Alloys and Compounds (2017), 691

An aqueous sol-gel process, previously developed for producing undoped and Cu2+, Ni2+, Zn2+ or Pb2+ doped TiO2 photocatalysts with remarkably high photocatalytic activity without requiring any calcination ... [more ▼]

An aqueous sol-gel process, previously developed for producing undoped and Cu2+, Ni2+, Zn2+ or Pb2+ doped TiO2 photocatalysts with remarkably high photocatalytic activity without requiring any calcination step, has been adapted to produce Fe3+, Cr3+, La3+ or Eu3+ single-doped TiO2 photocatalysts as well as La3+-Fe3+ and Eu3+-Fe3+ co-doped TiO2 catalysts. The physicochemical properties of the obtained catalysts have been characterized using a suite of complementary techniques, including ICP-AES, XRD, UV-Vis spectroscopy, nitrogen adsorption-desorption and Fe-57 Mössbauer. The active crystalline phase is obtained without requiring any calcination step and all the different catalysts are composed of nanocrystallites of anatase with a size of 6-7 nm and a high specific surface area varying from 181 to 298 m² g-1. In this study, the effect of the NO3:Ti(IV) mole ratio used to induce the peptisation reaction during the synthesis has been studied and the results revealed that this ratio can influence significantly the textural properties of the resulting catalyst. A screening of the photocatalytic activity of the undoped and Fe3+, Cr3+, La3+ or Eu3+ single-doped and co-doped photocatalysts has been performed by evaluating the degradation of 4-nitrophenol under UV-Visible light (330 nm < λ < 800 nm). This study suggests that the photocatalytic activity is significantly influenced by the dopant nature and content with an optimal dopant content being observed in the case of Fe3+ or La3+ single-doped as well as in the case of La3+-Fe3+ and Eu3+-Fe3+ co-doped catalysts. In the case of Cr3+ single-doped catalysts, a detrimental effect of the dopant on the photocatalytic degradation of 4-nitrophenol has been observed while no significant influence of the dopant has been detected in the case of Eu3+ single-doped catalysts. The role of the different dopants in modulating the photocatalytic activity is discussed. [less ▲]

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See detailIntegrated continuous flow photoreactors: Photooxidation of (L)-methionine with singlet oxygen
Emmanuel, Noémie ULiege; Mendoza Gallego, Carlos ULiege; Lismont, Marjorie ULiege et al

Poster (2016, December 08)

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side ... [more ▼]

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side-reactions or product degradation due to overexposure. The recent implementation of photochemical processes in microreactors under continuous-flow conditions appeared to be much more powerful than its batch analogue in terms of irradiation efficiency and light penetration. Furthermore, the fine control of residence time ensures an accurate control of the irradiation time, avoiding side-reactions and degradation. The photooxidation of (L)-methionine with singlet oxygen using Rose Bengal as a sensitizer was successfully implemented in a microreactor setup and led to total and selective conversion into methionine sulfoxide, an important building block for the organic synthesis of peptides or functionalized amino acid. The reaction was performed in 2 min while the same reaction in batch took 2h. [less ▲]

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See detailIntegrated continuous flow photoreactors: Photooxidation of (L)-methionine with singlet oxygen
Emmanuel, Noémie ULiege; Mendoza Gallego, Carlos ULiege; Lismont, Marjorie ULiege et al

Poster (2016, October 13)

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side ... [more ▼]

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side-reactions or product degradation due to overexposure. The recent implementation of photochemical processes in microreactors under continuous-flow conditions appeared to be much more powerful than its batch analogue in terms of irradiation efficiency and light penetration. Furthermore, the fine control of residence time ensures an accurate control of the irradiation time, avoiding side-reactions and degradation. The photooxidation of (L)-methionine with singlet oxygen using Rose Bengal as a sensitizer was successfully implemented in a microreactor setup and led to total and selective conversion into methionine sulfoxide, an important building block for the organic synthesis of peptides or functionalized amino acid. The reaction was performed in 20 min while the same reaction in batch took 2h. [less ▲]

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See detailTowards a large scale aqueous sol-gel synthesis of doped TiO2: Study of various metallic dopings for the photocatalytic degradation of p-nitrophenol
Mahy, Julien ULiege; Lambert, Stéphanie ULiege; Léonard, Géraldine ULiege et al

in Journal of Photochemistry and Photobiology A: Chemistry (2016), 329

In this paper, an easy aqueous sol-gel synthesis developed previously by Mahy et al. [J. Sol-Gel Sci. Technol. (2016)] is adapted to produce highly active TiO2 catalysts doped with Fe3+, Ag+, Cu2+, Zn2 ... [more ▼]

In this paper, an easy aqueous sol-gel synthesis developed previously by Mahy et al. [J. Sol-Gel Sci. Technol. (2016)] is adapted to produce highly active TiO2 catalysts doped with Fe3+, Ag+, Cu2+, Zn2+, Cr3+, Al3+, Mn2+, and Co2+ ions and Pt metallic nanoparticles. Samples are characterized by inductively coupled plasma–atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), Mössbauer spectroscopy, transmission electron microscopy (TEM), nitrogen adsorption–desorption measurements and diffuse reflectance spectroscopy measurements. Results show that the samples are composed of anatase-brookite TiO2 nanoparticles with a spherical shape and mean diameter of around 5-8 nm and a surface area of between about 150 - 250 m2 g-1. In each doped sample, the dopant is present in the form added during the synthesis, given that the sample has not undergone any particular treatment. Photoactivity tests show improvement in catalyst activity for Fe3+, Ag+, Cu2+, Zn2+, and Al3+ ion and Pt metallic nanoparticle dopants, while a decrease of activity is obtained for Cr3+, Mn2+ and Co2+ ion dopants. For some dopants, the activity of TiO2 doped with metallic ions and synthesized from the aqueous sol-gel process is equal or superior to the activity of the commercial photocatalyst Degussa P25. Some mechanisms are proposed to explain these modifications of activity with doping. Furthermore, cost comparison at laboratory scale showed that Zn and Cu nitrate salt dopings are clearly less expensive for a halogen light (UV/visible) or low energy light enhanced catalyst and may be considered for industrial applications. Using this method, a large scale Zn-doped TiO2 photocatalyst is synthesized with properties homologous to the lab-scale product. Results show that the aqueous sol-gel synthesis developed previously can be easily adapted for doping in order to produce an up-scalable synthesis. [less ▲]

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See detailDevelopment of a large scale aqueous sol-gel synthesis of doped TiO2
Mahy, Julien ULiege; Lambert, Stéphanie ULiege; Léonard, Géraldine ULiege et al

Conference (2016, July 20)

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See detailCatalytic reforming of biomass gasification tars with bi- or tri-doped catalysts optimized with organosilane precursors
Claude, Vincent ULiege; Courson, Claire; Heinrichs, Benoît ULiege et al

Conference (2016, June 08)

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO + H2) since this process presents the advantage of being renewable without ... [more ▼]

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO + H2) since this process presents the advantage of being renewable without emitting CO2. However, in practical applications, there are still some technical problems due to high tars concentration in the outlet gas which can condensate and clog the pipes. Many studies have highlighted the fact that the tar elimination via catalytic reforming seem to be the more practical and economical solution. The required properties of the catalysts are determined by its location: inside the reactor (primary catalyst) or outside of the reactor (secondary catalyst). Primary catalysts are generally robust, non-toxic, cheap and they are almost uniquely destined to fluidized bed reactors. Secondary catalysts can be used at the exit of both fluidized and fixed bed reactors. They are characterized by a tailored mesoporous shape, a controlled active site dispersion and an adapted elemental composition [1]. In this work , we decided to focus on designing materials for secondary catalytic applications, i.e. working at relatively low temperature (~650°C) with no mechanical stress. The supports were made of γ-Al2O3 synthesized via an easy Sol-Gel method. During their synthesis, these supports were doped with 10%wt of nickel and various combinations of metallic dopants (Co, Cu, Fe, Mn, Mo) in the aim of enhancing their catalytic activities and lifetime. [less ▲]

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See detailDevelopment of an easy aqueous sol-gel synthesis for large-scale film deposition methods for the manufacture of coated steel with self-cleaning properties
Mahy, Julien ULiege; Léonard, Géraldine ULiege; Pirard, Sophie ULiege et al

Conference (2016, May 20)

In this work, a global process has been developed to produce at a large scale pure TiO2 films deposited on steel in order to get an easy-to-clean surface. This large scale process implies an easy aqueous ... [more ▼]

In this work, a global process has been developed to produce at a large scale pure TiO2 films deposited on steel in order to get an easy-to-clean surface. This large scale process implies an easy aqueous sol-gel process for the synthesis of the TiO2 sol. This synthesis [1] has been simplified to make easier the extrapolation towards an industrial scale. Results of TEM, photocatalytic properties, film hydrophilicity, and texture obtained with the simplified aqueous sol-gel synthesis (IsoP-TiO2 synthesis) show similar properties than those obtained with the standard aqueous sol-gel synthesis of TiO2 developed previously (HAc-TiO2 synthesis [2]). Only XRD patterns were slightly different with the presence of anatase-brookite phases in IsoP-TiO2 synthesis while anatase phase only was observed in HAc-TiO2 synthesis. Both the aqueous sol-gel synthesis of pure TiO2 and the film deposition on steel by roll-coating have been successfully extrapolated to a larger scale. Indeed, the deposition was done on a pilot line, the steel substrate is 25 cm width, and the band length is 800 m. The coating was deposited at line speed ranging from 30 to 120 m.min-1.The photocatalytic activity and the hydrophilicity of the film were found to be unchanged compared to the films produced at a laboratory scale, thus validating the production of an efficient easy-to-clean material. Even if some problems have still to be solved, this study is a hopeful first step in the development of a large scale process for self-cleaning steel production. [1] S. Mahshid, M. Askari, M.S. Ghamsari, J. Mater. Process. Technol. 189 (2007) 296–300 [2] C.M. Malengreaux, S. Douven, D. Poelman, B. Heinrichs, J.R. Bartlett, J. Sol-Gel Sci. Technol. 71 (2014) 557–570 [less ▲]

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See detailTailoring γ-Al2O3 supports with specific silicon precursors
Claude, Vincent ULiege; Vilaseca, Miriam; Heinrichs, Benoît ULiege et al

Poster (2016, May 13)

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See detailCatalytic reforming of biomass gasification tars with bimetallic catalysts
Claude, Vincent ULiege; Vilasecca, Miriam; Heinrichs, Benoît ULiege et al

Poster (2016, May)

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See detailNon-isocyanate polyurethanes from carbonated soybean oil Using monomeric or oligomeric diamines To achieve thermosets or thermoplastics
Poussard, Loïc; Mariage, J.; Grignard, Bruno ULiege et al

in Macromolecules (2016), 49(6), 2162-2171

Fully bio- and CO2-sourced non-isocyanate polyurethanes (NIPUs) were synthesized by reaction of carbonated soybean oil (CSBO) either with biobased short diamines or amino-telechelic oligoamides derived ... [more ▼]

Fully bio- and CO2-sourced non-isocyanate polyurethanes (NIPUs) were synthesized by reaction of carbonated soybean oil (CSBO) either with biobased short diamines or amino-telechelic oligoamides derived from fatty acids to achieve respectively thermoset or thermoplastic NIPUs. Biobased carbonated vegetable oils were first obtained by metal-free coupling reactions of CO2 with epoxidized soybean oils under supercritical conditions (120 °C, 100 bar) before complete characterization by FTIR, 1H NMR, and electrospray ionization mass spectroscopy (ESI-MS). In a second step, biobased NIPUs were produced by melt-blending of the so-produced cyclocarbonated oil with the biobased aminated derivatives. The thermal and mechanical properties of resulting polymers were found to be depending on the cyclocarbonated vegetable oil/amine ratio. More precisely, short diamines and CSBO led to the formation of cross-linked NIPUs, and the resulting tensile and thermal properties were poor. In contrast, elastomeric NIPUs derived from oligoamides and CSBO exhibited a better rigidity, an improved elongation at break (εr up to 400%), and a higher thermal stability (T95 wt% > 350 °C) than those of starting oligoamides. These results are impressive and highlight the potentiality of this environmental friendly approach to prepare renewable NIPU materials of high performances. [less ▲]

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See detailDoping TiO2 films with carbon nanotubes to simultaneously optimise antistatic, photocatalytic and superhydrophilic properties
Léonard, Géraldine ULiege; Remy, Simon; Heinrichs, Benoît ULiege

in Journal of Sol-Gel Science and Technology (2016), 79

Pure and multiwall carbon nanotube (MWCNT)- doped titanium dioxide (TiO2) films, synthesised from two sol–gel routes (alcoholic and aqueous) and deposited by dipcoating on glass, have been developed as ... [more ▼]

Pure and multiwall carbon nanotube (MWCNT)- doped titanium dioxide (TiO2) films, synthesised from two sol–gel routes (alcoholic and aqueous) and deposited by dipcoating on glass, have been developed as conductive, photocatalytic and superhydrophilic materials. While already crystallised in anatase structure at low temperature when synthesised in water, samples prepared in alcohol are amorphous. Their crystallisation in air has been studied at increasing temperatures. Effective incorporation of functionalised MWCNTs is confirmed in both aqueous and alcoholic samples with a closer interaction with TiO2 particles in the case of aqueous synthesis. In alcoholic samples, 400 C seems to be an optimised calcination temperature since 300 C does not allow crystallisation into anatase and 500 C removes MWCNTs through burning. The purpose of MWCNT doping is to obtain coatings that exhibit easy-toclean or self-cleaning properties. This can be achieved through an optimised combination of electrical conductivity (for antistatic property), photoactivity and superhydrophilicity. These three properties require the crystallisation of TiO2 into anatase. MWCNT doping dramatically increases both conductivity and photocatalytic activity, especially in alcoholic samples for the former and in aqueous samples for the latter. On the other hand, MWCNT introduction does not significantly affect the (super)hydrophilicity of films, which depends solely on the crystallinity of TiO2. [less ▲]

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See detailOverview of Superhydrophilic, Photocatalytic and Anticorrosive Properties of TiO2 Thin Films Doped with Multi-walled Carbon Nanotubes and Deposited on 316L Stainless Steel
Léonard, Géraldine ULiege; Remy, Simon; Heinrichs, Benoît ULiege

in Materials Today: Proceedings (2016, February), 3(2), 434-438

TiO2 films with MWCNTs are produced for anticorrosive applications to increase the lifetime of steel materials. TiO2 has two additional properties, photoactivity and superhydrophilicity. Two TiO2 samples ... [more ▼]

TiO2 films with MWCNTs are produced for anticorrosive applications to increase the lifetime of steel materials. TiO2 has two additional properties, photoactivity and superhydrophilicity. Two TiO2 samples, synthesized in aqueous or alcoholic media, have been doped with MWCNTs. The material which best combines anticorrosive, superhydrophilic and photocatalytic properties, is the one produced in aqueous medium (Aq-TiO2-CNT). Doping with MWCNTs increases the photodegradation of p-nitrophenol from 18% to 50%. MWCNTs allow to reduce the corrosion current and the corrosion potential. The good superhydrophilicity of TiO2 is kept on stainless steel with a contact angle after illumination around 5°. [less ▲]

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