BACKGROUND Elemental sulfur exists is a variety of forms in natural systems, from dissolved forms (noted as S8(diss) or in water as S8(aq)) to bulk elemental sulfur (most stable as α-S8). Elemental sulfur can form via several biotic and abiotic processes, many beginning with small sulfur oxide or polysulfidic sulfur molecules that coarsen into S8 rings that then coalesce into larger forms: [For...

There have been contradictory results concerning the effect of doping Ti02 with Fe(II1) upon its photocatalytic activity. We believe that this is due to the method used in adding the Fe(1II) to Ti02. This paper addresses this issue by using a precise adsorption process for loading stable aqueous suspensions (sols) of Ti02 doped with Fe(1II). In this manner, we control the speciation of Fe(II1) ...

Un projet de recherche nous a amenées à interviewer des collégiens urbains propos leurs perceptions sols. Quel est l’intérêt porter attention ces discours d’enfants teintés d’une forme naïveté ? Dans un contexte où il urgent changer nos rapports aux sols face enjeux qu’ils portent, notamment en ville, crucial les rendre nouveau visibles et réfléchir leur gestion. Pour ce faire, faisons l’hypoth...

In this paper we emphasise the important role of Pluronic F127 on the porosity of mesoporous alumina prepared from boehmite colloids. By focusing on the F127/boehmite interactions we show how the concepts of interface science may help to predict and improve the textural characteristics of mesoporous alumina. By varying the synthetic parameters, in particular the copolymer content, we show that ...

In this paper we emphasise the important role of Pluronic F127 on the porosity of mesoporous alumina prepared from boehmite colloids. By focusing on the F127/boehmite interactions we show how the concepts of interface science may help to predict and improve the textural characteristics of mesoporous alumina. By varying the synthetic parameters, in particular the copolymer content, we show that ...

L’article porte sur la question de préservation des sols face à leur consommation pour l’urbanisation. En dépit d’une législation qui pousse plus en sobriété foncière, l’artificialisation se poursuit un rythme élevé France. Les approches par reconnaissance services écosystémiques sont développées améliorer ressources naturelles. Ces arrivent-elles infléchir lorsqu’elles appropriées les élus loc...

in this work, an optical sensor for detection of ascorbic acid is described. the sensor is fabricated by casting and spin-coating silica sol-gel doped with 2,6-dichlorophenol indophenol on the glass plates. the sols are in turn obtained by acidic hydrolysis of various precursors such as tetraethoxysilane, triethoxymethylsilane and triethoxyoctylsilane in the presence of 2,6-dichlorophenol indop...

It is often necessary to tailor nanoparticle (NP) interactions and their compatibility with a polymer matrix by grafting organic groups, but the commonly used silanization route offers little versatility, particularly in water. Herein, alumina-coated silica NPs in aqueous sols have been modified for the first time with low molecular-weight phosphonic acids (PAs) bearing organic groups of variou...