Loïc Vidal

Bio: Loïc Vidal is an academic researcher from University of Upper Alsace. The author has contributed to research in topics: Nanoparticle & Photopolymer. The author has an hindex of 32, co-authored 153 publications receiving 3097 citations. Previous affiliations of Loïc Vidal include University of Strasbourg & Centre national de la recherche scientifique.

U(VI) sorption and reduction by Fe(II) sorbed on montmorillonite.

Abstract: The influence of surface-bound Fe(II) on uranium oxidation state and speciation was studied as a function of time (6 min−72 h) and pH (6.1−8.5) in a U(VI)−Fe(II)-montmorillonite (Ca-montmorillonite...

Micro-, Mesoporous Boron Nitride-Based Materials Templated from Zeolites

Abstract: A second generation of boron nitride-based porous materials has been synthesized by a double nanocasting process via a carbonaceous template as a medium starting from a zeolite. In the multistep pr...

Equisetum arvense Templating of Zeolite Beta Macrostructures with Hierarchical Porosity

Abstract: Biomimetic zeolite Beta macrostructures with hierarchical porosity were prepared by using a silica-containing vegetal template (Equisetum arvense). Leaves and stems of Equisetum arvense were subjected to hydrothermal treatment with a zeolite Beta precursor solution. The zeolite readily crystallized in the vegetal tissues with the zeolite nucleation being induced by the highly reactive biomorphic silica deposited at the epidermal surface of the plant. Upon calcination the obtained zeolite/vegetal composite was transformed into a solely zeolite macrostructure that retained all morphological features of the vegetal template. The analysis of the zeolite/vegetal composite and all-zeolite replica showed that material with hierarchical porosity was obtained. The leaves and the stems of Equisetum arvense were transformed into micro-/mesoporous and micro-/meso-/macroporous structures, respectively. These structures were built up of zeolite nanoparticles with smaller sizes compared to the crystals from the bulk sol...

Template synthesis of a new type of ordered carbon structure from pitch

Abstract: New ordered nanoporous carbon materials can be synthesized using pitch and mesoporous silica materials as the carbon precursor and template, respectively. In this case, the silica material (type MCM-48 and SBA-15) is impregnated with pitch and further carbonized. After removal of the silica by acid treatment, a graphitizable carbon material with an ordered micro-mesoporosity is recovered. The preparation route as well as the characteristics of the carbon materials are presented in this paper. It appears that the use of pitch as the carbon precursor presents some advantages compared to carbon obtained by other methods. Moreover, study of the thermal stability of the carbon shows that the structural regularity is preserved upon heat treatment at 1675 K.

Deep eutectic solvents: syntheses, properties and applications

Abstract: Within the framework of green chemistry, solvents occupy a strategic place. To be qualified as a green medium, these solvents have to meet different criteria such as availability, non-toxicity, biodegradability, recyclability, flammability, and low price among others. Up to now, the number of available green solvents are rather limited. Here we wish to discuss a new family of ionic fluids, so-called Deep Eutectic Solvents (DES), that are now rapidly emerging in the current literature. A DES is a fluid generally composed of two or three cheap and safe components that are capable of self-association, often through hydrogen bond interactions, to form a eutectic mixture with a melting point lower than that of each individual component. DESs are generally liquid at temperatures lower than 100 °C. These DESs exhibit similar physico-chemical properties to the traditionally used ionic liquids, while being much cheaper and environmentally friendlier. Owing to these remarkable advantages, DESs are now of growing interest in many fields of research. In this review, we report the major contributions of DESs in catalysis, organic synthesis, dissolution and extraction processes, electrochemistry and material chemistry. All works discussed in this review aim at demonstrating that DESs not only allow the design of eco-efficient processes but also open a straightforward access to new chemicals and materials.

Chemical strategies to design textured materials: from microporous and mesoporous oxides to nanonetworks and hierarchical structures.

Abstract: 3.

Mesoporous Carbon Materials: Synthesis and Modification

Abstract: Porous carbon materials are of interest in many applications because of their high surface area and physicochemical properties. Conventional syntheses can only produce randomly porous materials, with little control over the pore-size distributions, let alone mesostructures. Recent breakthroughs in the preparation of other porous materials have resulted in the development of methods for the preparation of mesoporous carbon materials with extremely high surface areas and ordered mesostructures, with potential applications as catalysts, separation media, and advanced electronic materials in many scientific disciplines. Current syntheses can be categorized as either hard-template or soft-template methods. Both are examined in this Review along with procedures for surface functionalization of the carbon materials obtained.

Processing Routes to Macroporous Ceramics: A Review

Abstract: Macroporous ceramics with pore sizes from 400 nm to 4 mm and porosity within the range 20%–97% have been produced for a number of well-established and emerging applications, such as molten metal filtration, catalysis, refractory insulation, and hot gas filtration. These applications take advantage of the unique properties achieved through the incorporation of macropores into solid ceramics. In this article, we review the main processing routes that can be used for the fabrication of macroporous ceramics with tailored microstructure and chemical composition. Emphasis is given to versatile and simple approaches that allow one to control the microstructural features that ultimately determine the properties of the macroporous material. Replica, sacrificial template, and direct foaming techniques are described and compared in terms of microstructures and mechanical properties that can be achieved. Finally, directions to future investigations on the processing of macroporous ceramics are proposed.