Sébastien Maria

Aix-Marseille Université | AMU · Institut de Chimie Radicalaire

Soil analysis using infrared spectroscopy has been proposed as an alternative to conventional soil analysis to detect soil contamination. This study therefore aims to develop an innovative, in situ, rapid, precise, and inexpensive method that is easy to implement in order to assess soil contamination with hydrocarbons. This work describes the devel...

The recent advances in wearable technologies had caused a surge in the demand for stretchable Li-ion microbatteries. Herein, a special design based on micropillar electrodes supported on metallic serpentines has been investigated to achieve the fabrication of a functionning device. Besides achieving high areal capacity values like 2.5 mA h cm⁻² at...

The demand for developing next generation Li-ion batteries (LIBs) with high energy density and long cycle life drives the research toward alternative electrode materials with larger specific capacities. Among the several materials proposed to replace graphite (372 mAh g ⁻¹ ) as an anode material, antimony (Sb) and tin (Sn) have long been considered...

The high failure strain of thermoplastic elastomers (TPEs) is a very desirable feature for rechargeable Li-ion batteries by improving the lifetime of high specific capacity anode materials that undergo mechanical fractures induced by large volume variations. In this work, poly(styrene-b-2-hydroxyethyl acrylate) called PS-b-PHEA was synthesized by a...

In this work, it is reported the fabrication of highly stretchable electrodes on a polydimethylsiloxane substrate. A laser ablation technique is used to design lithium nickel manganese oxide micropillars supported on serpentine Al interconnects. Morphological, mechanical, and chemical analyses have been investigated by scanning electron microscopy,...

Cu/Ni-P/Au multi-layer systems are employed as electrical contacts. The Au top-layer is thin and porous. These pores deliver the corrosive media to the under-layer, which induces the corrosion by a galvanic coupling mechanism. Therefore, filling these pores is essential to improve the lifetime of electronic devices. The pores can be sealed by the e...

A new family of single-ion-conductor block-copolymer electrolytes (BCEs), comprising poly(ethylene oxide) (PEO) as conducting block and poly(styrene sulfonyl(trifluoromethanesulfonyl) imide of lithium) (PSTFSI) as structural block, was developed recently. To evaluate the influence of the structural blockon the physico-chemical and electrochemical p...

The demand for higher energy and power density for Li-ion batteries (LIBs), which are made of transition metal oxide cathodes and graphite anode, motivates the research toward alternative electrode materials with larger specific charge capacities ¹ . Among the several materials proposed to replace graphite (372 mAh.g ⁻¹ ) as an anode material, tin...

A series of water-soluble styrene and propyl (meth)acrylate based monomers bearing a sulfonyl(trifluoromethane sulfonyl) imide (STFSI) group was prepared. These monomers were synthesized in good yield from the corresponding chloride sulfonyl monomer and trifluoromethanesulfonamide. Their chemical structures were further confirmed by HR-MS and NMR s...

Liquid Chromatography under Limiting Conditions of Desorption (LC LCD) is a powerful separation tool for multicomponent polymer systems. This technique is based on a barrier effect of an appropriate solvent, which is injected in front of the sample, and which decelerates the elution of selected macromolecules. In this study, the barrier effects hav...

Epoxy resin/montmorillonite nanocomposites were obtained via in situ intercalative polymerisation. The polymer matrix consists of anhydride-cured epoxy, and the choice of catalyst allows exchange reactions without depolymerisation. This makes the resin insoluble and reprocessable at the same time and potentially recyclable. In this study, reprocess...

Nitroxide-mediated polymerization (NMP), being a reversible deactivation radical polymerization (RDRP) technique, has been the subject of considerable attention in polymer science. Lavishly granting access to well-defined and highly functional polymers, NMP has paved a huge avenue for complex macromolecular architectures. This book chapter highligh...

Block copolymer synthesis often results in a complex polymer mixture containing not only the desired block copolymer macromolecules but also one or both parent homopolymers. Such complex polymer mixtures resulting from Atom Transfer Radical Polymerization (ATRP) and Nitroxide Mediated Polymerization (NMP) syntheses of PS-b-PEO-b-PS were characteriz...

Solvent-free block copolymers electrolytes are the strongest candidates for solid-state lithium metal batteries, as new polymers based on polyethylene oxide (PEO) and lithium bis(trifluoromethane)sulfonimide (LiTFSI) prevent the formation of lithium dendrites and ensure sufficient conductivity. Block copolymers based on PEO and either polystyrene (...

We studied molar mass limits for the LC LCD separation of parent polystyrene (PS) and poly(ethylene oxide) (PEO) homopolymers from PEO/PS based block copolymers and we identified optimized chromatographic conditions. Time delays between barriers and sample injections were 0-2-3'10. Eluent was composed of dimethylformamide (DMF) 40wt.% and 1-chlorob...

The benefits of the conformal coating of polyethylene oxide (PEO)-based polymer electrolyte by the electropolymerization technique on titania nanotubes (TiO2nts) are highlighted. Due to the presence of polymer electrolyte coating the nanotubes, the capacity of the half cell is improved by 45% at 1 C compared to bare TiO2nts. The polymer-coated TiO2...

Solvent-free block copolymer electrolytes are promising materials for solid-state lithium batteries, as their tunable compositions and nanoscale morphologies enable simultaneous control of their ionic conductivities and mechanical properties. However, quantifying and distinguishing the transport and dynamics of the different ionic species can be ch...

This work reports the conformal coating of poly(poly(ethylene glycol) methyl ether methacrylate) (P(MePEGMA)) polymer electrolyte on highly organized titania nanotubes (TiO2nts) fabricated by electrochemical anodization of Ti foil. The conformal coating was achieved by electropolymerization using cyclic voltammetry technique. The characterization o...

Trichlorotris(tetrahydrofuran)molybdenum(III) (MoCl3(THF)3), is a widely used starting material for the synthesis of a broad range of molybdenum compounds. It was first prepared by a carbonyl route, but later the compound was obtained by a reductive procedure in three steps starting from MoCl5. In spite of the various incremental improvements, the...

Amphiphilic block copolymers based on azido-functional polystyrene (PVBA) and hydrophilic poly(ethylene oxide) (PEO) have been synthesized by nitroxide mediated polymerization and used to prepare aqueous spherical micelles. These micelles consisting of a PEO corona and a PVBA core were stabilized by cores cross-linking under UV irradiation without...

Separation of parent homopolymers, polystyrene and poly(ethylene oxide), from the triblock copolymer polystyrene-b-poly(ethylene oxide)-b-polystyrene was investigated by means of liquid chromatography techniques. Overall suitability was evaluated and compared for size exclusion chromatography, (SEC), liquid chromatography under critical conditions...

In this work we investigate the effects of KrF nanosecond laser ablation on poly(methyl methacrylate) (PMMA) in combination with pyrene. Three materials containing PMMA were studied: (1) one doped with pure pyrene, (2) one doped with methyl 3-(1-pyrenyl)propanoate (so called alkylpyrene derivative thereafter), and (3) one grafted with pyrene. This...

In this work we discuss the response to laser ablation of a poly(4-vinylbenzyl azide-random-methyl methacrylate) (p((S-N3)-r-MMA)) random copolymer. This material is cross-linkable thermally and upon exposure to UV light, and on cross-linked films the irradiation with a 248 nm ns KrF laser induces the formation of laser induced periodical surface s...

Electrochemical energy storage is one of the main societal challenges of this century. The performances of classical lithium-ion technology based on liquid electrolytes have made great advances in the past two decades, but the intrinsic instability of liquid electrolytes results in safety issues. Solid polymer electrolytes would be a perfect soluti...

Novel semiconductor block copolymers were synthesized using nitroxide-mediated radical polymerization (NMRP). They are comprised of a hole conductor block carrying tetraphenylbenzidine pendant units (PVDMTPD) and a second poly(4-vinylpyridine) (P4VP) block suitable for the preferential incorporation of n-type semiconductor nanocrystals. The conditi...

The atom transfer radical polymerization of methyl acrylate in 1-butyl-3-methylimidazolium hexafluorophosphate was studied with a molybdenum halide catalytic system. A combination of a bromine-containing initiator (ethyl-2-bromopropionate) with a chloride-containing catalyst [MoCl3(PMe3)3/MoCl4(PMe3)3] led to a controlled polymerization, and matrix...

Compound CpMoI2(iPr2dad) (iPr2dad=iPrNCHCHNiPr), obtained by halide exchange from CpMoCl2(iPr2dad) and NaI, has been isolated and characterized by EPR spectroscopy, cyclic voltammetry, and X-ray crystallography. Its action as a catalyst in atom transfer radical polymerization (ATRP) and as a spin trap in organometallic radical polymerization (OMRP)...

The addition of either NEt3BzCl or [Ph3PNPPh3]Cl (1 equiv. chloride per metal) to a 1:1 mixture of HfCl4 and TiCl3 in SOCl2 results in Ti oxidation and leads to the corresponding salts of the [TiHfCl10]2– ion. A solution IR investigation in the ν(M–Cl) region indicates that this ion is in equilibrium with the homodimetallic [Ti2Cl10]2– and [Hf2Cl10...

The molecular structure of bis(acetylacetonate)cobalt(II) ([Co(acac)2]) in solution and in the presence of the electron donors (ED) pyridine (py), NEt3, and vinyl acetate (VOAc) was investigated using 1H NMR spectroscopy in C6D6. The extent of formation of ligand adducts, [Co(acac)2(ED)x], varies in the order py>NEt3>VOAc (no interaction). Density...

Complex MoOCl2(PMe3)3 smoothly reacts with NaI in acetone to produce MoOI2(PMe3)3 in good yields. The geometry of the compound is mer-cis octahedral, that is, identical to that of the dichloride precursor, as shown by NMR spectroscopy and by an X-ray crystallographic study. Electrochemical investigations of MoOX2(PMe3)3 show irreversible oxidation...

Compound Al(OiPr)3 is shown to catalyze the halide-exchange process leading from [Mo(Cp)Cl2(iPrN=CH-CH=NiPr)] and CH3CH(X)COOEt (X=Br, I) to the mixed-halide complexes [Mo(Cp)ClX(iPrN=CH-CH=NiPr)]. On the other hand, no significant acceleration is observed for the related exchange between [MoX3(PMe3)3] (X=Cl, I) and PhCH(Br)CH3, by analogy to a pre...

The molybdenum(III) coordination complexes MoX(3)(PMe(3))(3) (X = Cl, Br, and I) are capable of controlling styrene polymerization under typical atom transfer radical polymerization (ATRP) conditions, in conjunction with 2-bromoethylbenzene (BEB) as an initiator. The process is accelerated by the presence of Al(OPr(i))(3) as a cocatalyst. Electroch...

The radical polymerization of vinyl acetate was controlled by bis(acetylacetonato)cobalt(II). Radicals were generated at 30°C by 2,2′-azo-bis(4-methoxy-2,4-dimethyl valeronitrile). This particular system, under the same conditions, is not suitable for the control of the radical polymerization of n-butyl acrylate. VAc oligomers formed by this method...