Christine Taviot-Gueho

• University of Clermont Auvergne

Antioxidants play a crucial role in inhibiting polypropylene (PP) oxidative damage and extending polymer lifetime. However, the high migration rate and limited efficiency reduced protection, often requiring overdosing, which raises environmental and health issues. Herein, a more sustainable solution involves an ultrathin antioxidant intercalated la...

In this work, the layered double hydroxide (LDH) Mg2Al(OH)6 was intercalated with redox active ferrocene carboxylate anions in order to implement charge storage capability to the interlayer spaces of the LDH structure. Two sets of anions, namely mono‐ and dicarboxylic ferrocene, were intercalated to produce two different active materials: MgAl‐FcMo...

Chronic wounds are non-healing lesions characterized by a high degree of inflammation, posing significant challenges in clinical management due to the increased risk of severe infection. This study focuses on developing a powder for cutaneous application to enhance the healing and prevent infections in chronic wounds. The smart nanocomposites-based...

Intercalation of deprotonated folic acid (FA; vitamin B9) is of great interest for nutraceutical and cosmeceutical purposes. Although some studies have already reported the intercalation of divalent (HFol2- ) or trivalent (Fol3- ) folate anions into layered double hydroxides (LDH), the structure, spectroscopic, and thermal behavior of such hybrid m...

Phosphate-loaded MgAl LDH demonstrates adjustable and consistent phosphate release properties, which are heavily influenced by various physicochemical parameters.

Layered Double Hydroxides (LDHs) are a versatile class of 2D materials, which consist of layered di- and trivalent metal cation hydroxides with intercalated anions (1). They are used in many applications including energy storage electrodes, water purification or drug delivery (2, 3). In this new study, Anthraquinone-2-sulfonate (AQS) intercalated i...

For more than half a century, layered double hydroxides (LDHs) have attracted great attention from the scientific community. These materials belong to a rare anionic clay group and have demonstrated amazing physicochemical properties, leading to disruptive, cost-effective and eco-friendly applications for health, environment and agriculture. Howeve...

A layered double hydroxide (LDH) compound LDH ([Mg 2 Al(OH) 6 ] ⁺ x 2 H 2 O) intercalated with a redox active organic anion, Anthraquinone-2-sulfonate (AQS), has been envisioned as an electrode material for high power aqueous based battery. The purpose is to use this interlayer redox active molecule for enhancement of the specific capacity at the L...

A novel organic–inorganic hybrid, based on SiO2-CaO-ZnO bioactive glass (BG) and polycaprolactone (PCL), associating the highly bioactive and versatile bioactive glass with clinically established PCL was examined. The BG–PCL hybrid is obtained by acid-catalyzed silica sol–gel process inside PCL solution either by direct or indirect printing. Apatit...

NHC-heterocyclic carbene metal complexes are efficient catalysts used for the oxidation, amination, cycloaddition or hydration of alkynes. Immobilization of such complex is a strategy to avoid its decomposition/deactivation and allow its recycling. One limitation of the immobilization of carbene metal complexes is the acidic pH required to perform...

N–acetyl–L–cysteine (NAC), a derivative of the L–cysteine amino acid, presents antioxidant and mucolytic properties of pharmaceutical interest. This work reports the preparation of organic-inorganic nanophases aiming for the development of drug delivery systems based on NAC intercalation into layered double hydroxides (LDH) of zinc–aluminum (Zn2Al–...

Nanostructure control is an important issue when using electroactive materials in energy conversion and storage devices. In this study, we report various methods of synthesis of nanostructured copper (II) hydroxide nitrate (Cu2(OH)3NO3) with a layered hydroxide salt (LHS) structure using various synthesis methods and investigate the correlation bet...

By selecting two electroactive species immobilized in a layered double hydroxide backbone (LDH) host, one able to act as a positive electrode material and the other as a negative one, it was possible to match their capacity to design an innovative energy storage device. Each electrode material is based on electroactive species, riboflavin phosphate...

The diterpenoid abietate (ABI) ion, the conjugate base of the phytochemical abietic acid, was intercalated into a series of layered double hydroxides (LDH) with Mg2FeyAl(1-y) composition envisioning the preparation of drug delivery systems. Experimental parameters were evaluated to achieve organic-inorganic hybrid iron-based LDH as single-phases en...

Heterostructures constructed with mesoporous silica and layered double hydroxides are interesting for catalytic and drug delivery applications. Different arrangements between these phases are possible. In this study, we prepared heterostructures by embedding layered double hydroxides phases [M4Al2(OH)12](CO3) (M = Mg2+ or Zn2+) within the MCM41 mes...

In this work, Al cation was gradually replaced by FeIII in the composition of Layered Double Hydroxides (LDH) and systematically investigated for LDH application as drug carriers, ultimate aiming to improve their biointegration. The incorporation of FeIII into LDH layers, as well the intercalation of organic anions in the iron‐based materials, is c...

Hypothesis While controlled and efficient exfoliation of layered oxides often remains a time consuming challenge, the surface modification of inorganic nanosheets is of outmost importance for future applications. The functionalization of the bulk material prior to exfoliation should allow the application of tools developped for Van der Waals materi...

Layered Double Hydroxides (LDH) and related nanocomposites have attracted much attention for biomedical applications and the development of LDH drug carriers composed by endogenous metals, such as iron, is of obvious interest. However, most of the studies reported so far on iron-containing LDH, mainly focusing on the applications, suffer from insuf...

La ciprofloxacine (CIP) fait partie de la famille des fluoroquinolones qui sont des antibiotiques fréquemment utilisés en prescription médicale courante car ils possèdent un bon profil de tolérance, une excellente biodisponibilité et un large spectre antibactérien. Les effets secondaires de la CIP sont pour la plupart des réactions attendues : gast...

Correction for ‘Unravelling lithiation mechanisms of iron trifluoride by operando X-ray absorption spectroscopy and MCR-ALS chemometric tools’ by F. Eveillard et al. , New J. Chem. , 2020, 44 , 10153–10164, DOI: 10.1039/C9NJ06321H.

The thermal behavior of a model MK based K‐geopolymer (Si/Al = 1.38 and K/Al = 0.68; obtained by alkaline activation of a very pure metakaolin) was investigated between room temperature and 1400°C in order to evaluate its potentiality for high‐temperature applications. The purpose of our study was to monitor the behavior of a geopolymer during a te...

A series of CoRMn-LDH (R = 1, 2, 3, 4, 5) was synthesized by the coprecipitation method. The formation of layered double hydroxides (LDH) phases is confirmed by powder X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The energy dispersive X-ray analysis (EDX) shows the total coprecipitation of Co and Mn. The X-ray photoelectron spectroscop...

The compound p-coumaric acid (HCou) is found in many foods and presents action in suppression of chronic diseases and protective effects on neurodegenerative disorders. This work presents the intercalation of...

The lithium-ion batteries are extensively used for electrochemical energy storage but their performances need to be continuously increased. One solution is to use alternative cathode materials such as iron trifluoride. However, its galvanostatic profile depends on the allotropic phase studied. To go further on such various lithiation mechanisms, qu...

This paper describes the intercalation of ciprofloxacin (CIP), a bactericidal antibiotic, into the interlayer space of layered double hydroxides (LDH). To counter the problem of bacterial resistance and also to improve the properties of CIP drug, the drug carrier approach promises significant benefits. Through a tightly control of the synthesis par...

The project aim on the development of intercalated compounds based on layered double hydroxide (LDH) materials as carriers of bioactive species.

Polybutylene succinate (PBS) nanocomposite materials were prepared using a melt compounding process. The Mg2Al-based PBS nanocomposites, dispersed with inorganic–organic hybrid materials (layered double hydroxides, LDHs), were functionalized with the amino acids L-histidine (HIS) and L-phenylalanine (PHE). The rheological and anti-ultraviolet (anti...

This work is concerned with the development and characterization of polymer-layered double hydroxides (LDHs) composites for application as surgical and post-surgical devices. LDHs are able to encapsulate negatively charged bioactive species and to propitiate its prolonged release. Besides, these materials may interfere positively in tissues regener...

This work explores the synthesis, physicochemical characterization, and in vivo biocompatibility of iron-based layered double hydroxides (LDHs) with molar ratio M²⁺/(Fe³⁺ + Al³⁺) equal to 2, Fe³⁺/Al³⁺ equal to 1, and chloride anions as charge-compensating ion (abbreviated Mg4FeAl-Cl and Zn4FeAl-Cl) prepared by the coprecipitation method. The higher...

The insertion of phenylbutylamine into a layered perovskite of formula H2Bi0.1Sr0.85Ta2O7 (HST) has been investigated as a function of the synthesis conditions. For short reactions times (1.5 h), achieved using microwave assisted reactions, a short interlayer distance (2.2 nm) is obtained (PBA1-HST) whereas for long reaction times (18 h) achieved u...

The encapsulation of molecules of therapeutic interest is emerging as an attractive tool to increase the stability of an active ingredient, to control its release over time and to prevent drug overdose. In this drug delivery approach, several analgesic molecules are considered, including (2E)–2-cyano-3-(furan-3-yl)acrylic acid (CFAA), and the host...

Hybrid materials based on layered double hydroxides (LDHs) exhibit great potential in diverse fields such as health care, polymer composites, environment, catalysis, and energy generation. Indeed, the compositional flexibility and the scalability of LDH structures, their low cost, and their ease of synthesis have made hybrid LDHs extremely attracti...

This study focuses on the thermal oxidation of model composites of insulating materials based on a cross-linked mixture of EVA (Ethylene Vinyl Acetate) and EPDM (Ethylene Propylene Diene Monomer) highly loaded (60 wt %) with ATH (Aluminium TriHydrate) filler. A thorough analysis of the material is performed, focusing not only on the polymer but als...

A series of eight low band gap polymers based on benzodithiophene - diketopyrrolopyrrole (BDT-DPP) skeleton were designed with side chain variation on the benzodithiophene unit. The effect of different side chains, including -H, alkyl, alkoxy, and aryl moieties, over polymer stability is examined. Thin films were processed and submitted to photooxi...

Additional PXRD analysis.

Increasing attention has been devoted to the design of layered double hydroxide (LDH)-based hybrid materials. In this work, we demonstrate the intercalation by anion exchange process of poly(acrylic acid) (PAA) and three different hydrophilic random copolymers of acrylic acid (AA) and n-butyl acrylate (BA) with molar masses ranging from 2000 to 420...

This work investigated in-situ changes in the structure of the layered double hydroxides (LDH) during electrochemical processes as well followed the ion motion related to the charge balancing process. Electrogravimetric measurements, using an electrochemical quartz crystal microbalance (EQCM), allowed to monitor simultaneously changes in current an...

Sulindac, a non-steroidal anti-inflammatory of indene acetic acid class, was immobilized inside layered double hydroxide Mg2Al and Zn2Al (LDH) nanovessels through one pot reaction. LDH-drug materials were characterized by chemical elemental analysis, X-ray diffraction (XRD) (one dimensional electron distribution along the c-stacking axis, pair dist...

This work deals with the structure and the microstructure of tantalum oxynitride thin films deposited by reactive magnetron sputtering. The local structures of amorphous as-prepared thin films are investigated using the pair distribution function (PDF) technique based on total Xray scattering experiments. The corresponding annealed thin films are a...

In this review, we comprehensively summarize the synthetic approach that can be developed for the design and the preparation of iron complex intercalated LDH structure which mainly involves oxalate, citrate, ferrocyanide, ferrocene, N,N’-ethylenebis(salycylideneiminato) (salen), porphyrine and proteins. Then, we propose a detailed overview of the c...

A combination of original, powerful characterization techniques was used to make a thorough description of solid geopolymers and of the associated effect of varying the alkali cation source - NaOH, KOH, or CsOH - and aging for up to several years. More specifically, the local and pore structures were progressively determined from atomic local scale...

COPYRIGHT OWNED BY ACI International The interaction of methoxy-capped poly(ethylene glycol) polymers (MPEG) and a poly(methacrylic acid) anionic polymer (PMA) from water onto sodium Montmorillonite (Na-Mmt) particles untreated or treated by calcium chloride was studied at 20°C. In the absence of Ca2+, MPEGs are able to intercalate by displacing t...

BackgroundA new Layered Double Hydroxide (LDH) material has been developed through a pioneering approach, with the goal of being an alternative adsorbent for the separation of biomolecules, such as clavulanic acid (CA).ResultsZn2Cr-CA hybrid LDH assemblies were prepared through coprecipitation method to evaluate the affinity between the CA molecule...

Unlabelled: The impact of side-chain variations on the photothermal stability of solar cells containing poly(benzodithiophene-diketopyrrolopyrrole) polymers are investigated in the absence of oxygen. Four different side-chains of benzodithiophene (BDT) are synthesized and copolymerized with diketopyrrolopyrrole (DPP) by Stille polymerization. The...

This Article presents the systematic experimental and theoretical investigation of the structural arrangements of dodecyl sulfate (DS) anions in the interlayer space of layered zinc hydroxide salts (LZH-DS) and of the structure of zinc hydroxide layers, with a detailed description of the zinc ions’ coordination environment. As-prepared, well-crysta...

Oxynitride materials, which offer the possibility of merging oxide and nitride properties, are increasingly studied for this reason. This paper focuses on assessing the optical properties of tantalum oxynitride thin films deposited by pure tantalum target sputtering in an Ar/O2/N2 reactive atmosphere. First, by changing the oxygen to reactive gas f...

Through a topochemical oxidative reaction (TOR) under air, a β-Co(OH)2 brucite type structure is converted into a monometallic CoIICoIII–CO3 layered double hydroxide (LDH). The structural and morphological characterizations are performed using powder X-ray diffraction, Fourier-transformed IR spectroscopy, and scanning and transmission electron micr...

Through a topochemical oxidative reaction (TOR) under air, a β-Co(OH)2 brucite type structure is converted into a monometallic CoIICoIII–CO3 layered double hydroxide (LDH). The structural and morphological characterizations are performed using powder X-ray diffraction, Fourier-transformed IR spectroscopy, and scanning and transmission electron micr...

Layered double hydroxides (LDH), also referred as hydrotalcite like compounds (HTlc), constitute a large group of natural and synthetic minerals whose physico-chemical properties have strong analogies with clay minerals and more particularly with cationic clay minerals. In the first part, LDH are described in terms of natural and synthetic chemical...

The authors report the production of regular zincite nanospheres () in a single step, at room temperature using the macrocycle cucurbit[7]uril (CB[7]) as a clipping template in very small amounts. This procedure is the simplest way to obtain this semiconductor in such form and dimension directly from aqueous solutions of Zn(NO3)2.

The photostability and photobactericidal properties of PdTPPC (Pd(ii)-5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin)-Zn2Al/PU (polyurethane) composite films have been studied in order to investigate their applicability as new photodynamic surfaces. These films comprise a PdTPPC porphyrin photosensitizer intercalated between the lamella of Zn2Al lay...

We studied a series of NiAl–CO3 layered double hydroxides (LDHs) of various degrees of crystallinity prepared by a glycine-assisted hydrothermal method. The structures and the microstructures were determined by Rietveld refinement with a spherical harmonic-implemented algorithm using high-resolution synchrotron powder X-ray diffraction (XRD) data....

Layered double hydroxide (LDH) nanocontainers, suitable as carriers for anionic drugs, were intercalated with Pravastatin drug using magnesium–aluminum and zinc–aluminum in a MII/Al molar ratio equal 2 and different Al3+/Pravastatin molar ratios. Postsynthesis treatments were used in order to increase the materials crystallinity. Hybrid materials w...

The lifetime of organic solar cells (OSCs) is a key point that has to be addressed to allow their commercial development. Ultra-barrier organic/inorganic multilayer encapsulation therefore has to be developed to improve OSC stability. Polymer nanocomposites are good candidates to be used as the organic layer in the multilayered structure. We report...

Extended X-ray absorption fine structure (EXAFS) spectroscopy at the iodine K-edge was performed to investigate the immobilization of iodide by AFm-Cl2/CO3/SO4 phases. AFm-I2 and various compositions of AFm-(I2, Cl2), AFm-(I2, CO3), and AFm-(I2, SO4) were synthesized by coprecipitation and exchange reaction. X-ray diffraction (XRD) showed that AFm-...

Uptake of iodine in hydrotalcite-like minerals is a potential retardation mechanism for dose-relevant 129 I in the near-field of a deep repository for radioactive waste. The location of iodide in (Zn/Mg)Al layered double hydroxides (LDH) was investigated using a combination of advanced atomic-scale techniques. Wavelet transform analysis of Zn K-edg...

The ability of cement phases carrying positively charged surfaces to retard the mobility of (129)I, present as iodide (I(-)) in groundwater, was investigated in the context of safe disposal of radioactive waste. (125)I sorption experiments on ettringite, hydrotalcite, chloride-, carbonate- and sulfate-containing AFm phases indicated that calcium-mo...

In this study, inorganic–organic hybrids were prepared by intercalation of metal complexes (Zn and Fe) of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TSPP) into Zn2Cr layered double hydroxides (LDH) by coprecipitation method at constant pH. The resulting materials were characterized by powder X-ray diffraction, UV-Vis and FTIR spectroscopies s...

Waterborne polymer coatings based on polymer composites were prepared by using layered double hydroxides (LDH) as reinforcing inorganic particles. Starting with a model system we demonstrated the impact of the nature of the charge balancing anions of the LDH phase on the kinetics of the polymer intercalation and the film building as well as on the...

This work demonstrates that it is possible, using different approaches, to intercalate neutral and low water-soluble inclusion matrices like cucurbiturils into layered double hydroxide materials. It is also possible to remove them without destroying the LDH host structure. This is an important achievement for the design of new functional inclusion/...

The present study aims at investigating the structural and dynamics properties of intercalated tartrate and succinate anions in Zn2Al layered double hydroxides (LDHs). The comparison between these two anions allows the estimation of the impact of the presence of hydroxyl groups in tartrate on the dynamics, orientational, and rotational behaviors of...

Recently, LDH have been considered as a new kind of gene delivery system [1, 2]. In this work, we report the formation of magnesium-gallium LDH-DNA nanohybrids using the coprecipitation method. This "self assembly" approach enabled the incorporation of long DNA fragments up to 6000-8000 bp. X-ray diffraction analyses indicate a parallel orientation...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Nanocontainer and nanofiller aspects of layered double hydroxides (LDH) were combined to prepare porphyrin-LDH/polymer composites for photoactive coatings. The suggested properties are derived from cytotoxicity of singlet oxygen, O(2)((1)Delta(g)), produced by interaction of molecular oxygen with excited porphyrin molecules located within the inter...

The structural modifications of polymers irradiated with 14 MeV neutrons were studied. Two elastomers, a polypropylene-type polymer and poly(ethylene oxide) were exposed to low doses of fast neutrons in the range of 0.3-14 Gy. The radiation damages were observed at the molecular scale by infrared spectroscopy. The morphological changes were investi...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

A layered double hydroxide (LDH) hydrotalcite–pyroaurite solid-solution series Mg 3 (Al x Fe 1 − x)(CO 3) 0.5 (OH) 8 with 1 − x = 0.0, 0.1……1.0 was prepared by co-precipitation at 23 ± 2 °C and pH = 11.40 ± 0.03. The compositions of the solids and the reaction solutions were determined using ICP-OES (Mg, Al, Fe, and Na) and TGA techniques (CO 3 2−...

Using time-resolved, in situ energy-dispersive X-ray diffraction (EDXRD), the formation of interstratified LDH structures, with alternate interlayer spaces occupied by different anions, have been demonstrated during anion exchange reactions. Novel hybrid LDH nanostructures can thus be prepared, combining the physicochemical properties of two interc...

In order to better understand the relationship between LDH synthesis parameters and their particle sizes, diverse carbonate intercalated NiAl–LDH phases were prepared using different coprecipitation conditions and their structure, microstructure and morphology were characterized. The samples were synthesized by coprecipitation either at constant pH...

The arrangement of porphyrin molecules in the interlayer space of layered double hydroxides (LDH) has been studied by a combination of experimental techniques and molecular dynamics simulations. Intercalation of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrins (TPPS) into ZnRAl and MgRAl LDH hosts led to a gallery height of about 15.5 Å that is com...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Flower-like NiAl-layered double hydroxides (LDH) were successfully synthesized by a straightforward one-pot hydrothermal method using Ni(II) glycinate complex as a chemical precursor under extremely high basic conditions and soft hydrothermal conditions. Systematic screening of synthesis parameters such as reaction time and hydrothermal process tem...

Three different anionic blue organic dyes have been intercalated into the structure of Zn(2)Al layered double hydroxides, using the co-precipitation method at constant pH. Using the same synthetic procedure, Zn(2)Al-Cl has been prepared and used as an adsorptive phase to retain the blue dyes from an aqueous solution. All the organic/inorganic (O/I)...

Layered double hydroxides (LDH) suitable as fillers for the formulation of waterborne polyurethane (WPU) nanocomposites in coating applications are designed and characterized. Their elaboration follows a simple and reproducible process leading to samples without impurity. The attention is paid to the impact of the LDH nature (MxAl/CO32−, M=Mg and/o...