Article
Engineering, Environmental
Carla I. A. La Fuente, Andressa Tamyris de Souza, Carmen C. Tadini, Pedro Esteves Duarte Augusto
Summary: In this study, films were produced using cassava starch modified by ozone technology and cellulose nanofibres. The addition of cellulose nanofibres improved certain properties of the films under certain conditions, although agglomeration was visible at higher concentrations. The inclusion of NCF in ozonated cassava films improved their properties for specific applications.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Review
Electrochemistry
P. Robert Ilango, A. Dennyson Savariraj, Hongjiao Huang, Linlin Li, Guangzhi Hu, Huaisheng Wang, Xiaodong Hou, Byung Chul Kim, Seeram Ramakrishna, Shengjie Peng
Summary: Flexible and free-standing electrospun nanofibres are crucial for constructing flexible electrodes and enhancing electrochemical properties in energy storage systems. The demand for flexible batteries has increased with the growth of wearable and flexible devices. Carbon and carbon-derived composites are necessary for the development of flexible and wearable batteries with superior mechanical flexibility, higher energy, and substantial power density. Understanding recent advances in flexible electrospun nanofibres and their synthesis and assembly is essential. This review focuses on the design and merits of various carbon-based nanofibres, including hierarchical, porous, and metal/metal oxide carbon composites, for flexible electrodes.
ELECTROCHEMICAL ENERGY REVIEWS
(2023)
Article
Environmental Sciences
Jian Pan, Mengqian Qian, Yu Li, Haiqiang Wang, Baohong Guan
Summary: Metal-free catalysts play a crucial role in water treatment by effectively removing harmful quinoline derivatives and reducing chemical oxygen demand. This study demonstrates the use of fluorinated ceramic honeycomb as a catalyst for stable catalytic ozonation, generating free reactive oxygen species and efficiently degrading the target compound.
Article
Environmental Sciences
Jian Pan, Mengqian Qian, Yu Li, Haiqiang Wang, Baohong Guan
Summary: A metal-free catalyst, fluorinated ceramic honeycomb, was prepared to catalyze the ozonation of 4-methylquinoline with high efficiency in degrading and removing COD. The catalyst surface contains abundant active acid sites, enhancing the ozone decomposition to generate reactive oxygen species, with free hydroxyl radicals playing a major role in the degradation and COD removal of 4-Meq.
Article
Chemistry, Organic
Hugo Bloux, Ahmed Ait Khouya, Jana Sopkova-de Oliveira Santos, Frederic Fabis, Emmanuelle Dubost, Thomas Cailly
Summary: A novel radioiodination method using carboxylic acids as radiolabeling precursors is developed. This method efficiently radiolabels (hetero)-arenes and cinnamic and phenylpropiolic acids through decarboxylation and formation of organogold-(I) intermediate. Additionally, the prolonged stability and enduring radiolabeling capabilities of crude gold-(I) organometallic compounds are demonstrated.
Article
Engineering, Mechanical
Vasilis Tsigkis, Kian Bashandeh, Pixiang Lan, Andreas A. Polycarpou
Summary: PS400 is a high temperature bearing alloy developed by NASA. When paired with DLC, it shows low friction and excellent wear resistance up to 500 degrees C. DLC provides good lubrication at 25 degrees C and maintains low friction even at 500 degrees C with oxide glazes transferring on its surface.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
Jie Li, Jingjie Niu, Yongjae Kim, Heeyeop Chae
Summary: The wettability of amorphous carbon films was adjusted by controlling plasma fluorination. The surface fluorination was characterized by measuring the F/C atomic ratio using X-ray photoelectron spectroscopy. The relationship between the contact angle and F/C atomic ratio was investigated.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Applied
Jinmin Meng, Ting Liu, Chen Meng, Zihan Lu, Jiashen Li
Summary: Based on polyacrylonitrile (PAN)/poly(vinylpyrrolidone) (PVP) electrospun precursor fibres, an efficient and cost-effective pore generation approach was developed to produce porous carbon nanofibres (PCNFs) with humidity sensing potential. The solid PAN/PVP fibres were transformed into porous ones with higher surface areas through the collective effects of crystallisation of PAN and dissolution of PVP. PCNFs film showed promising future as a stable and reactive humidity sensor.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Enrico Bergamaschi, Giacomo Garzaro, Georgia Wilson Jones, Martina Buglisi, Michele Caniglia, Alessandro Godono, Davide Bosio, Ivana Fenoglio, Irina Guseva Canu
Summary: CNTs/CNFs should be considered as a heterogeneous class of materials with different properties and biological effects. Animal studies indicate that certain species of CNTs/CNFs can cause inflammation and lung tissue remodeling. Human studies suggest mild effects in workers handling CNTs/CNFs.
Article
Chemistry, Physical
Gaixia Zhang, Marie Colin, Xiaohua Yang, Shuhui Sun, Jean-Pol Dodelet, Marc Dubois
Summary: This paper investigates the gas/solid fluorination of various types of N-doped porous carbons, observing that the process affects the porosity of the materials, especially the micropores. A new N1s peak and a dual C-F bonding structure were identified in all fluorinated N-doped porous carbons.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Mechanical
Victor Velho de Castro, Leonardo Moreira dos Santos, Leonardo Marasca Antonini, Roberto Moreira Schroeder, Silvana Mattedi, Klester S. Souza, Marcelo Barbalho Pereira, Sandra Einloft, Carlos Alexandre dos Santos, Celia de Fraga Malfatti
Summary: This study aims to evaluate the tribological and electrochemical effects of lubricants with Protic Ionic Liquid (PIL) and talc particles (TC) as additives on SAE 1010 and SAE 1045 steels. The tribofilm formed from the interaction between PIL lubricants and steel substrates decreases wear and increases lubricity. PIL additives perform better compared to commercial lubricants, despite the addition of talc.
Article
Engineering, Environmental
Joao Restivo, Carla Alexandra Orge, Ana Sofia Guedes Gorito dos Santos, Olivia Salome Goncalves Pinto Soares, Manuel Fernando Ribeiro Pereira
Summary: A series of macro-structured catalysts consisting of nanostructured layers of mechanically processed MWCNT coated onto cordierite monoliths were prepared and evaluated for the first time in the ozonation of organic pollutants. The study showed that the positive effect of ball-milled MWCNT as catalysts in ozonation reactions is retained even after coating, despite a decrease in intrinsic activity of the powder material. The introduction of oxygen-containing surface functionalities improved the long-term stability of the nanostructured catalytic layers.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Wen-Xin Lv, Yin Li, Yuan-Hong Cai, Dong-Hang Tan, Zhan Li, Ji-Lin Li, Qingjiang Li, Honggen Wang
Summary: In this study, a hypervalent iodine-mediated oxidative gem-difluorination strategy was developed for the construction of gem-difluorinated alkylborons via an unusual 1,2-hydrogen migration event. The protocol showed high regio- and chemoselectivity and provided easy access to a broad range of beta-difluoroalkylborons under mild reaction conditions. The value of these products was demonstrated by transforming the boryl group into other valuable functional groups, offering a wide range of difluorine-containing molecules.
Article
Polymer Science
Oscar Seward, Fernando Cepero-Mejias, J. Patrick A. Fairclough, Kevin Kerrigan
Summary: This study proposes a novel open-loop tribological testing method to generate a dynamic FE friction model for CFRP machining simulations. The model is based on a function of fiber angle, contact pressure, and slip rate, and has been validated using experimental results and FE simulations.
Article
Polymer Science
Vijay Patel, Unnati Joshi, Anand Joshi, Blessing Kudzai Matanda, Kamlesh Chauhan, Ankit D. Oza, Diana-Petronela Burduhos-Nergis, Dumitru-Doru Burduhos-Nergis
Summary: This manuscript presents an experimental investigation of the friction and wear properties of PMMA nanocomposites reinforced with functionalized MWCNTs. The results indicate that the MWCNTs can effectively enhance the tribological performance of PMMA. The optimal MWCNT loading was found to be 0.5 wt.%, resulting in the lowest friction coefficient and wear rate.
Article
Materials Science, Multidisciplinary
Charlotte Gervillie, Aurelie Boisard, Julien Labbe, Katia Guerin, Sandrine Berthon-Fabry
Summary: SnO2 nanoparticles were synthesized using different methods and heat-treated under argon to study their physico-chemical characteristics. When used as electrode material in a lithium ion battery, hydroxyl groups and paramagnetic centers were identified as key factors affecting electrochemical performance.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Charlotte Gervillie, Marc Dubois, Malika El-Ghozzi, Sandrine Berthon-Fabry, Aurelie Boisard, Julien Labbe, Katia Guerin
Summary: Surface fluorination of MWCNT/SnO2 using different fluorinating agents results in varying interface stability and cycling capacity performance, providing important research support for improving the performance of anode materials in secondary lithium-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
B. S. de Lima, A. A. Komorizono, W. A. S. Silva, A. L. Ndiaye, J. Brunet, M. I. B. Bernardi, V. R. Mastelaro
Summary: This paper discusses a novel synthesis procedure for rGO-ZnO nanocomposites, involving UV laser radiation for GO reduction and RF-magnetron sputtering for ZnO nanoparticle deposition on the rGO surface. The resulting material can operate at high temperatures and exhibit a detection limit of 100 ppt, outperforming pure ZnO with a detection limit around 1 ppb.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Optics
Hugo Bruhier, Isabelle Verrier, Thiaka Gueye, Christelle Varenne, Amadou Ndiaye, Olivier Parriaux, Colette Veillas, Stephanie Reynaud, Jerome Brunet, Yves Jourlin
Summary: This study deeply analyzes the influence of the roughness of shallow or deep metallic diffraction gratings on the propagation of surface plasmon mode along the metallic-air interface. It is found that the scattering losses lead to a spectral or angular broadening of the surface plasmon resonance (SPR) and a shift of the resonance wavelength and coupling angle. These effects need to be overcome when using such structures, especially deep ones, as SPR-based sensors.
Article
Chemistry, Multidisciplinary
Aleksander Aleksenskii, Marcus Bleuel, Alexei Bosak, Alexandra Chumakova, Artur Dideikin, Marc Dubois, Ekaterina Korobkina, Egor Lychagin, Alexei Muzychka, Grigory Nekhaev, Valery Nesvizhevsky, Alexander Nezvanov, Ralf Schweins, Alexander Shvidchenko, Alexander Strelkov, Kylyshbek Turlybekuly, Alexander Vul, Kirill Zhernenkov
Summary: This study investigates the effect of particle sizes on the efficiency of neutron reflectors made of detonation nanodiamonds (DNDs), showing that smaller and larger DNDs are more efficient for faster and slower velocities of very cold neutrons (VCNs) respectively. The replacement of larger DNDs with smaller ones increases the neutron albedo above 60 m/s velocity range, resulting in an increase in the density of faster VCNs in the reflector cavity and extending the upper boundary of efficient VCN reflection velocities.
Article
Chemistry, Inorganic & Nuclear
Fabien Eveillard, Fabrice Leroux, Nicolas Batisse, Diane Delbegue, Katia Guerin
Summary: Conversion cathodes, such as metal fluorides, have high theoretical capacities but suffer from poor cyclability. By exploring ternary metal fluorides and using a polymer electrolyte membrane, as well as applying the MMTF multi-metallic template fluorination method, their electrochemical properties can be improved and compatibility with all solid state batteries can be achieved.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Polymer Science
Alain Pauly, Sahal Saad Ali, Christelle Varenne, Jerome Brunet, Eduard Llobet, Amadou L. Ndiaye
Summary: In this study, we synthesized a composite nanostructure PANI/MCs by combining a conducting polymer, polyaniline (PANI), with an organic semiconducting macrocyclic (MCs) material. The resulting composite nanostructure showed good electrical properties and enhanced sensing performance. Furthermore, the sensing behavior under different conditions, including ambient humidity and temperature, was investigated, revealing unique characteristics that contribute to understanding the sensing mechanism.
Article
Chemistry, Multidisciplinary
Nicoloo Canever, Xianjue Chen, Mark Wojcik, Hui Zhang, Xinchen Dai, Marc Dubois, Thomas Nann
Summary: A microwave-mediated strategy was used to quickly exfoliate graphite fluoride and obtain exfoliated materials based on density difference. The exfoliated graphene fluoride had good electrical conductivity and its electrochemical performance could be further improved by activation.
Article
Chemistry, Physical
Marie Colin, Sam Chen, Hani Farhat, Katia Guerin, Marc Dubois
Summary: This study demonstrates that fluorination of graphene oxide films under mild conditions can result in highly fluorinated graphene oxide films with maintained structure and mechanical strength. The fluorinated films exhibit unique electrochemical properties in lithium batteries and can potentially be used as hydrophobic lubricant membranes.
Article
Chemistry, Physical
Alexei Bosak, Marc Dubois, Ekaterina Korobkina, Egor Lychagin, Alexei Muzychka, Grigory Nekhaev, Valery Nesvizhevsky, Alexander Nezvanov, Thomas Saerbeck, Ralf Schweins, Alexander Strelkov, Kylyshbek Turlybekuly, Kirill Zhernenkov
Summary: In this study, we investigated the quasi-specular reflections (QSRs) and reflections of cold neutrons (CNs) and very cold neutrons (VCNs) from nanodiamond (ND) powders. We found that fluorinated ND increased its efficiency and appropriate ND sizes increased the probability of diffuse reflection of VCNs. Our experimental results on the QSRs of CNs from different sized NDs provide important insights for optimizing the parameters of NDs in practical applications.
Review
Chemistry, Physical
Marian Chatenet, Sandrine Berthon-Fabry, Yasser Ahmad, Katia Guerin, Marie Colin, Hani Farhat, Lawrence Frezet, Gaixia Zhang, Marc Dubois
Summary: The article describes the benefits of covalent grafting of fluorine atoms onto carbonaceous materials for designing new electrocatalysts for low-temperature fuel cells. The fluorination conditions must be carefully chosen based on the physicochemical properties of the starting materials to achieve optimal results. The effects of fluorination on PGM-based and non-PGM-based electrocatalysts are discussed, and future research prospects and technical challenges of fluorination for fuel cells are proposed.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Dan Villamanca, Marie Colin, Karin Ching, Aditya Rawal, Yanfang Wu, Dong Jun Kim, Marc Dubois, Sam Chen
Summary: In this study, graphene oxyfluoride films were prepared by gas-phase fluorination of graphene oxide layers, and the composition and stability of the films were successfully controlled. The resulting films exhibited stable morphology and structure, as well as tunable water stability and water vapor permeability.
APPLIED SURFACE SCIENCE
(2024)
Article
Chemistry, Inorganic & Nuclear
Sebastien De Windt, Jeremie Auvergniot, Pierre-Etienne Cabelguen, Fabienne Gschwind, Marc Dubois, Katia Guerin
Summary: Due to their high initial electrochemical properties and wide compositional flexibility, lithium-rich disordered rocksalt cathode-active materials, especially high-performance manganese-only materials, have the potential to replace the current market leader NMC material based on cobalt. The lack of stability is the main issue with these materials. However, recent research has found bulk fluorination as a possible solution to stabilize these compounds. The study demonstrates several synthesis strategies and a tailored characterization methodology to explore the chemical space of direct fluorination of manganese oxide MnO and successfully synthesizes a range of novel, safe, and finely tunable manganese oxyfluorides.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Bruno S. de Lima, Amanda A. Komorizono, Amadou L. Ndiaye, Maria Ines B. Bernardi, Jerome Brunet, Valmor R. Mastelaro
Summary: In2O3 nanoparticles have an impact on the gas-sensing performance of rGO, enhancing sensitivity to O-3 and NO2 while reducing sensitivity to NH3. Additionally, at temperatures close to 160 degrees C, the concentration of In2O3 nanoparticles can cause a rare transition from p-type to n-type semiconductor nature in rGO-In2O3 nanocomposites.
Article
Chemistry, Inorganic & Nuclear
Xianda Wu, Minghong Chen, Shuiyun Zheng, Fu-Sheng He, Jie Wu
Summary: Here, we report a new method for synthesizing sulfilimines through an iron-catalyzed reaction between sulfenamides and 2,2,2-trifluor-diazoethane. This protocol features operational simplicity, mild conditions, and can be conducted in open air, providing a facile approach to trifloromethylated sulfilimines in moderate to good yields.
JOURNAL OF FLUORINE CHEMISTRY
(2024)
Article
Chemistry, Inorganic & Nuclear
Ita Hajdin, Romana Pajkert, Haibo Mei, Jianlin Han, Gerd-Volker Roeschenthaler
Summary: A catalyst- and solvent-free 1,3-dipolar cycloaddition reaction using a bench-stable diazo reagent has been developed to obtain a series of novel 3H-pyrazoles bearing difluoromethyl phosphonate unit in moderate-to-excellent yields. This method provides an efficient and easy route to synthesize valuable compounds.
JOURNAL OF FLUORINE CHEMISTRY
(2024)
