Alain Celzard

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Verified

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• PhD, HDR
• Professor (Full) at University of Lorraine

Two new species of Ovulidae FLEMING, 1822, are described from the Miocene of West Java, Indonesia, and placed in a new genus, Marmorovula n. gen. whose marble-like shells are without an equivalent in the family. This is the second extinct genus of Ovulidae known.

The genus Cryptospira is reporled for the first time in Europe with the discovery of a new extinct species from the middle Eocene of Italy. Its attribution to this genus was made possible by a study of the columellar plications using X-ray tomography, the only way to see the internal structure of the single specimen available, whose shell is comple...

The chemical activation of sunflower seed shells (SSS) with H3PO4 led to highly porous activated carbon (ACSSSH3PO4) containing carbon-centered environmentally persistent free radicals (EPFRs), quinone functional groups, among others, and a slight graphitization degree. With high diclofenac (DFC) and ibuprofen (IBP) dark adsorption capacity (~98% a...

This study showcases the exceptional detection capabilities of a silicon-based micro-analytical device engineered to identify low concentrations of BTEX (benzene, toluene, ethylbenzene, and xylene) in indoor air, with a focus on the critical role of connectivity within the adsorbent material. Two micro-mesoporous carbons were synthesized using an e...

The electromagnetic properties of 3D-printed carbon–carbonyl iron powder (CIP) composites are studied in the radio (20 Hz–1 MHz) and microwave (26–37 GHz) frequency ranges. Relatively high electrical conductivities (about several hundred S/m), typical for these structures in the radio frequency range, are observed. The temperature dependence of ele...

To demonstrate for the first time the potential of stereolithography‐printed, architected, bio‐based carbon‐supported Ni catalysts for CO2 methanation, three honeycomb carbon structures with different textural properties were prepared, impregnated with 15 wt.% of nickel metal particles, and studied to correlate their catalytic performances with the...

Gas sensors play a crucial role in detecting harmful environmental gases. This study focuses on optimizing a resistive sensing layer for nitrogen dioxide (NO2) detection at room temperature (RT = 25 °C), based on commercial activated carbon (AC). NO2 sensing was assessed over a dynamic concentration range from 1 to 20 ppm. The impact of cycle time,...

The gas-sensing potential of SnO2 monotubes is investigated for the first time based on experimental and theoretical approaches. The production of the tubular morphology is explored by forcespinning, thereby testing 200 and 300 μm spinning nozzles, followed by calcination. All annealed samples of SnO2 exhibited a tetragonal rutile structure and dis...

While the genus Eucypraedia Schilder, 1939 is well known in Europe, and has been reported in the Americas with the species Eucypraedia multicarinata Dall, 1890, claimed to have the widest known distribution for a Paleogene gastropod, from the Gulf of Mexico to Peru, a new species belonging to this genus has just been discovered in Southern Australi...

This paper presents a literature review focusing on the separation of hydrogen sulfide (H2S) from biogas using activated carbon (AC), compared with other materials such as biochars, zeolites, metal–organic frameworks (MOFs) and metal-based adsorbents in terms of H2S separation capacity. The evaluation is carried out on different biogas compositions...

Activated carbon (AC), a highly porous and low-cost material, was tested as a biosubstitute material for healing bone defects. The aim of this work was to investigate the use of 4 different activated carbon materials in the tissue repair process, verifying morphological and biomechanical aspects of the bone. Experiments were performed by drilling r...

Metal-organic frameworks (MOFs) are promising materials for hydrogen (H2) storage due to their versatile structures, high surface areas and substantial pore volumes. This paper provides a comprehensive review of MOF...

The rational design of metal‐nitrogen‐doped carbons (M‐N‐C) from available and cost‐effective sources featuring high electrocatalytic performance and stability is attractive for the development of viable low‐temperature fuel cells. Herein, mimosa tannin, an abundant polyphenol easily extracted from the Mimosa plant, is used as a natural carbon sour...

final phase of a biogas upgrading plant. The focus is particularly on the use of pressure swing adsorption (PSA) units for this purpose. Four types of adsorbents, including activated carbons (ACs), carbon molecular sieves, metal organic frameworks, and zeolites, are thus evaluated based on their selectivity in CO2/CH4 separation and PSA working cap...

The coexistence of single atoms and nanoparticles is shown to increase the oxygen reduction performance in Fe‐N‐C electrocatalysts, but the mechanisms underlying this synergistic effect remain elusive. In this study, model Fe‐N‐C electrocatalysts with controlled ratios of FeN4 sites and Fe3C nanoclusters is systematically designed and synthesized....

A new species of Ovulidae J. Fleming, 1822 from the Middle Miocene of Victoria, Australia, is reported. The species is provisionally placed in the genus Cuspivolva Cate, 1973, which, if confirmed, will be the first record of this genus in the fossil record of this part of the world.

A new species of Ovulidae J. Fleming, 1822 from the Nyalindung Formation, late Middle Miocene of West Java, Indonesia, is reported. The species is provisionally placed in the genus Dissona Cate, 1973, which, if confirmed, will be the first occurrence of this genus in the fossil record.

Controlling the precision and mechanical cohesion of 3D-printed parts remains a central concern in the development of additive manufacturing. A two-dimensional finite element model of the photopolymerization of a complex sensitive resin, formulated with three monomers to better represent commercial resins, in a stereolithography apparatus is propos...

Polydimethylsiloxane (PDMS)-based composites filled with 80, 300, and 700 nm-sized BaTiO3 (BTO) particles at different concentrations (23, 30, and 40 vol %) were prepared, and their temperature and frequency dielectric properties, as well as electromechanical energy harvesting performance, were studied. BTO/PDMS composites exhibit a low-temperature...

To provide a comprehensive description of hierarchical pore networks and optimize micro-mesoporous materials, it is essential to consider pore connectivity as a parameter. This study introduces an innovative hierarchy-connectivity factor (HCF) that includes the volume, size, and connectivity data of pores within the pore network. This study covers...

A new species of Pediculariidae Gray, 1853 from the Lower Lutetian (Eocene) of the Paris region, France, is described in this article, and compared with related species from the same region and and/or closely related stratigraphic stages. Curiously, this species, attributed to the genus Cypraedia Swaison, 1940, has been overlooked in spite of its u...

Drymaeus nigroflavus is a newly described species found in the region of Itapebi, Bahia, Brazil, near the Jequitinhonha River. This species is characterized by its whitish shell adorned with dark, spiral bands that are uniform and spaced apart. Its genital system exhibits a very short penis and bursa copulatrix, as well as a spermoviduct with a wid...

The primary objective of this manuscript is to explore the latest advancements in gas-sensing technologies, with a particular focus on the utilization of activated carbons (ACs) and their hybrids. In recent years, the significant increase in air pollution has brought gas-sensing technologies to the fore. Consequently, gas sensors play a crucial rol...

Controlling the precision and mechanical cohesion of 3D-printed parts remains a central concern in the development of additive manufacturing. A two-dimensional finite element model of the photopolymerization of a sensitive resin in a stereolithography apparatus is proposed as a tool for predicting and optimizing formulation and printing parameters....

This review article highlights the key factors in selecting the appropriate activated carbons (ACs) to remove the most common micropollutants present in drinking water. The study shows that tap water contains various pollutants, including drugs (paracetamol, carbamazepine, 17 beta-estradiol), pesticides (atrazine, desethyla�trazine, metolachlor (...

The genus Neosimnia P. Fisher, 1884, is reported for the first time from Indonesia in the form of several fossil species, recovered together from the Miocene deposits of Tasikmalaya, West Java. The species described closely resemble their current Atlantic counterparts, of which they exhibit all the modern characteristics. Nevertheless, they are und...

Encapsulating Fe3C in carbon layers has emerged as an innovative strategy for protecting Fe3C while preserving its high oxygen reduction activity. However, fundamental questions persist regarding the active sites of encapsulated Fe3C due to the restricted accessibility of oxygen molecules to the metal sites. Herein, the intrinsic electron transfer...

This manuscript presents a critical assessment of water evaporation measurements reported in solar evaporation studies. To explore the critical properties required for solar evaporator materials, six materials, including five carbon-based materials and one tannin-derived foam were characterised and tested. Minimal differences were observed between...

In this study, we used three-dimensional (3D) printed concave geometries filled with activated carbon to create a unique 3D solar evaporator for clean water production. The evaporation process was modeled considering airflow and solar radiation to investigate the advantages of 3D concave geometries. This work encompasses a series of studies, focusi...

This study demonstrates that ammonia concentration when doping carbons using hydrothermal treatment has crucial impact on textural properties. The latter translates into an improvement of the electrochemical performance of carbon materials, when used into electrochemical capacitors, especially at high-rate performance. Nitrogen-doped carbons were s...

A two-dimensional axisymmetric finite element model of the pyrolysis of 3D-printed tannin-based composite was developed using COMSOL Multiphyics. The thermal degradation of such bio-based composites involves the interaction, in a porous medium, of heat, mass and momentum transfer with chemical reactions. Heat is transported by conduction and convec...

Anion exchange membrane fuel cells (AEMFCs) have recently attracted significant attention as low-cost alternative fuel cells to traditional proton exchange membrane fuel cells because of the possible use of platinum-group metal-free electrocatalysts. Over the past decade, new materials dedicated to the alkaline medium, such as anion exchange membra...

Carbon xerogels (CX) with varying nodule sizes, from 50 nm to 2 μm, are synthesized via polycondensation of resorcinol with formaldehyde in water, followed by pyrolysis at 800 ◦C to investigate their electrochemical properties as negative electrode material in Na-ion batteries. All samples exhibit high specific surface areas (~600 m2 g-1 by N2 phys...

The remediation of polluted water is a major concern for public health and the environment. Catalytic removal of model organic and inorganic pollutants in water using carbon catalysts has shown promising results. In the present work, stereolithographically 3D‐printed bio‐based carbon monoliths with different textural and surface chemistry propertie...

The present study investigates the functionalization of a commercial Metal-Organic Framework (MOF) named “MIL-53(Al)” using an NH3 impulse dielectric barrier discharge (IDBD) plasma treatment. The main objective of this research is to assess the efficacy of the IDBD treatment in grafting nitrogenous groups onto the MOF’s organic ligand. Additionall...

This work presents the dielectric and ultrasonic properties of polydimethylsiloxane (PDMS) nanocomposites filled with titanium dioxide nanoparticles. The dielectric study was performed over a very broad range of frequencies (20 Hz–3 THz). The dielectric permittivity was almost frequency-independent in all the composites at room temperature over the...

Microfiber electrodes derived from graphite felt were used for the evaluation of charge transfer kinetic constants in a ferrocyanide-based electrolyte, which is a model system for redox flow batteries. Cyclic voltammetry experiments were performed in the presence of 10− 2 M or 0.5 M Fe(CN)6 4−. Within this framework, microfiber electroanalysis allo...

adsorption by carbon materials over a pressure range from 1 to 25 bar and a temperature range from 273 to 323 K. It also highlights the importance of providing volumetric CO2 adsorption capacities when presenting newly developed materials. These results were obtained by exploring the influence of O- and N-doping on CO2 uptake on 14 activated carbon...

Fuel cells (FCs) have emerged as a promising alternative for efficient electricity production in the future [1]. However, their widespread commercialization is hindered by their prohibitive cost due to the large amount of platinum used in these electrochemical systems [2]. Platinum is used to accelerate the unfavorable kinetics of the cathodic oxyg...

The growing interest in environmentally friendly materials is leading to a re-evaluation of natural fibers for industrial applications in order to meet sustainability and low-cost objectives, especially for thermal insulation of buildings. This paper deals with the chemical and physical characterization of fibers extracted from seagrass (Posidonia...

The fabrication step of the catalyst layer (CL) is important to master in order to achieve good performance in fuel cells. Nevertheless, the final structure of a CL depends on many factors, such as the ink composition and preparation, as well as the order of its preparation steps. However, it is not easy for neophytes to understand the relationship...

Greener and more mechanically robust 3D-printed structures were obtained by adding tannin to acrylate resin. Mimosa tannin particles (5–25 wt %) were incorporated into an acrylate resin formulated and 3D-printed to fabricate tannin-reinforced composites using stereolithography. FTIR spectroscopy and printing parameters highlighted the photoblocking...

In this study, we systematically study the efficient production method and electrochemical characteristics of activated carbons (AC) derived from rice husk (RH) and walnut shell (WS). In particular, the effectiveness of physical activation using carbon dioxide (CO2) was investigated and compared with the more common chemical activation method using...

Nitrogen-doped carbon-based electrodes are among the most promising alternatives to platinum-based electrodes in the cathode of fuel cells and metal-air batteries, where the oxygen reduction reaction (ORR) takes place. Among the approaches for improving ORR activity, nitrogen functionalities and well-developed textural properties have proved very e...

Brazil, a global frontrunner in pesticide consumption and sales, particularly glyphosate, appears to be at odds with other countries that increasingly ban these products in their territories. This study gathers the values of Acceptable Daily Intake and Maximum Residue Limits (MRL) in the European Union for dozens of substances and subsequently cont...

In this Letter, we propose the design of a non-reciprocal electromagnetic metasurface, which uses a highly nonlinear liquid metamaterial as a source of non-reciprocity. We show that the proposed metasurface, whose thickness is comparable to the wavelength, can exhibit a difference between the transmission coefficients in the forward and backward di...

This study focuses on the design, additive manufacturing, and characterization of porous carbon-based structures in the form of a triply periodic minimal surface (TPMS) with outstanding mechanical properties and oxidation resistance, combined with good electrical and thermal conductivity. Binder jetting (BJ) of graphite-carbon black powders was use...

A new species of Ovulidae Schilder, 1968, Pseudosimnia javanensis n. sp., is described from Miocene formations in the hills south of Tasikmalaya, West Java, Indonesia. The general appearance of the new taxon shows a combination of characters that distinguish it from any other living species of Pseudosimnia Schilder, 1925. One subspecies is also des...

In this study, efficient electrodes for the hydrogen evolution reaction (HER) based on low-cost and metal-free carbon catalysts are presented. Phytic acid, a biosourced molecule containing carbon (C) and phosphorus (P), was found to be an excellent precursor for producing carbon materials with high P content, depending on the carbonization temperat...

Liquid hydrogen (LH2) offers the highest storage density compared to other forms of storage, without requiring a chemical reaction. However, it requires the hydrogen be cooled to 20 K using an energy-intensive refrigeration process. LH2 storage is associated with the unavoidable evaporation of a fraction of the LH2, known as “boil-off”, which resul...

3D-printed carbon structures filled with BaTiO3 nanoparticles were investigated in low (20 Hz–1 MHz) and microwave (26–37 GHz) frequency ranges. These structures possess rather high electrical conductivity in the low-frequency range (about several S/cm) and excellent dielectric properties in the microwave range. The electrical transport is thermall...

The sluggish kinetics and high overpotential of the oxygen reduction reaction (ORR) in fuel cells and metal–air batteries are currently resolved through the use of expensive and scarce platinum-based electrocatalysts. Here, a green and straightforward synthesis method for preparing metal-free phosphorus-doped carbon (PDC) materials via carbonizatio...

In this paper, we show the preparation and characteristics of new 3D-printed porous carbons obtained by stereolithography (SLA) of a precursor resin followed by heat treatment. Their physical and textural properties can be tuned by using chemically modified biobased aromatic precursors as monomers. Thus, vanillin and polyflavonoids such as mimosa t...

Hard carbons are the most investigated materials as negative electrode for Na-ion batteries, although the exact mechanism of sodium storage remains under debate. This work is focused on the study of the sodiation mechanism of non-graphitizing carbons (NGC) prepared in a wide range of pyrolysis temperatures (1000 °C–2500 °C), thus covering the whole...

A series of highly flexible and environmentally friendly composites based on polydimethylsiloxane (PDMS) filled with 200 nm size ferroelectric BaTiO3 (BTO) particles at different concentrations (from 7 to 23 vol %) have been fabricated by a simple dispersion method. The dielectric, piezoelectric, and ultrasonic properties have been studied. The fer...

The sluggish kinetics of the oxygen evolution reaction (OER) is one of the most limiting factors for the development of many “green” electrochemical devices. Expensive ruthenium and iridium oxide electrodes are often used as advanced electrocatalysts to overcome this limitation. However, these materials are rare in nature, which further limit the i...

WO3 is one of the most interesting materials for photocatalysis due to its optical absorption in UV–vis, good charge carrier transport, and stability against photocorrosion. A detailed knowledge of the hydration state of WO3 is indispensable to gain more precise mechanistic insights into its photocatalytic activity. To the best of our knowledge, th...

Preventing enzyme deactivation while increasing their accessibility by adsorption in mesopores remains a key challenge in the design of biocompatible supported enzymatic catalysts. Herein, it is expected that food-grade monomeric or polymeric glycopeptides containing organic phosphate groups (as casein phosphopeptide derivatives) enhances the entra...