Article
Chemistry, Physical
Fevronia T. Andreou, Barbara Barylska, Zuzanna Ciesielska, Marek Szczerba, Arkadiusz Derkowski, Vassilis Gionis, Eirini Siranidi, Georgios D. Chryssikos
Summary: The selective self-assembly of small molecules in the interlayer of kaolinite was studied using near-infrared (NIR) spectroscopy and X-ray diffraction (XRD) to provide a complementary local structural description. The study found that the commonly employed XRD-based formalism tended to overestimate reaction progress, while the bonding of NMF in the interlayer was independent of reaction progress and kaolinite type. Both NIR and XRD recorded identical sigmoidal kinetics, and the isothermal NIR monitoring showed time-temperature superposable sigmoidals with an apparent activation energy of -60 kJ/mol for both samples.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Physical
M. -S. Yacoub Elhadj, F. Xavier Perrin
Summary: Kaolinite-urea intercalates were prepared by dry grinding kaolin KGa-1b with urea using a planetary ball mill. The purification process involved repeated washings with isopropanol to remove excess urea. The proportion of intercalated and non-intercalated urea crystals was quantified using DSC and TGA analysis.
APPLIED CLAY SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Calvin D. Quilty, Garrett P. Wheeler, Lei Wang, Alison H. McCarthy, Shan Yan, Killian R. Tallman, Mikaela R. Dunkin, Xiao Tong, Steven Ehrlich, Lu Ma, Kenneth J. Takeuchi, Esther S. Takeuchi, David C. Bock, Amy C. Marschilok
Summary: Ni-rich NMC is a promising cathode material for Li-ion batteries, but cycling at higher voltages within the voltage window of 3-4.7 V leads to increased capacity initially, but also results in suppressed redox reactions of Ni and Co, higher structural distortion, transition metal dissolution, higher impedance, and greater capacity fade over time.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Alexander S. Goloveshkin, Alexandre S. Golub, Ekaterina D. Grayfer, Viktor G. Makotchenko, Vladimir E. Fedorov
Summary: This study builds a structural model of the intercalation compound C2F·xClF3 and explains the experimentally observed composition of the product of gas-phase fluorination of natural graphite. The X-ray diffraction patterns of the compound were studied and the phase composition, crystal structure parameters, and sizes of ordered regions were refined. The study also examines the noncovalent bonding interactions between the components of the compound using topological analysis and evaluation of interaction energies.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Federica Ursi, Simone Virga, Gonzalo Garcia-Espejo, Norberto Masciocchi, Antonino Martorana, Francesco Giannici
Summary: Layered TiS2 intercalated with linear alkylamines has shown promising performance as a flexible n-type thermoelectric material, but its thermal and environmental stability remains a challenge. This study demonstrates that amine-intercalated TiS2 prepared by mechanochemical process is prone to chemical decomposition through sulfur exsolution, and molecular oxygen is likely to mediate this reaction. Computational analysis suggests the formation of Ti-N adducts as a result of amine groups substituting for sulfur vacancies.
Article
Chemistry, Physical
I El Hajj, L. Speyer, S. Cahen, L. Herbuvaux, P. Lagrange, G. Medjahdi, C. Herold
Summary: A solid-liquid method was used to synthesize bulk BaC6 graphite intercalation compound, allowing for crystal structure determination. The study found that BaC6 crystallizes in the hexagonal P6(3)/mmc space group based on X-ray diffraction data.
Article
Chemistry, Multidisciplinary
Tetsuo Katayama, Tae-Kyu Choi, Dmitry Khakhulin, Asmus Dohn, Christopher Milne, Gyoergy Vanko, Zoltan Nemeth, Frederico Lima, Jakub Szlachetko, Tokushi Sato, Shunsuke Nozawa, Shin-ichi Adachi, Makina Yabashi, Thomas Penfold, Wojciech Gawelda, Gianluca Levi
Summary: By simultaneously measuring femtosecond X-ray emission and scattering, the intramolecular and solvation structural dynamics following photoexcitation of a solvated copper photosensitizer were tracked. The results reveal that photoinduced solute and solvent motions can be intimately intertwined, explaining the influence of the solvent on the initial steps of light harvesting. This work is a step forward in understanding the microscopic mechanisms of the bidirectional influence between transient solvent reorganization and photoinduced solute structural dynamics.
Article
Multidisciplinary Sciences
Yuting Luo, Shahed Rezaei, David A. Santos, Yuwei Zhang, Joseph Handy, Luis Carrillo, Brian J. Schultz, Leonardo Gobbato, Max Pupucevski, Kamila Wiaderek, Harry Charalambous, Andrey Yakovenko, Matt Pharr, Bai-Xiang Xu, Sarbajit Banerjee
Summary: This study examines the differences in electrochemical performance of V2O5 insertion electrodes with different crystal structures. The results show that the tunnel-structured V2O5 electrode has a simpler insertion mechanism and better battery performance compared to the layered V2O5 electrode, which undergoes a series of phase transformations and distortions, resulting in larger voltage hysteresis and capacity loss.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
J. Theo Kloprogge, Concepcion P. Ponce, Danilo O. Ortillo
Summary: XPS analysis of layered clay systems with intercalated inorganic and organic compounds reveals valuable insights into the structure, coordination, and oxidative transformations of these compounds. By studying the shifts in binding energies and multiplet splitting, XPS can track changes in oxidation states and coordination environments within the materials.
Article
Chemistry, Physical
Inass El Hajj, Lucie Speyer, Sebastien Cahen, Pascal Berger, Ghouti Medjahdi, Philippe Lagrange, Claire Herold
Summary: This paper presents the synthesis of three Ba-based Graphite Intercalation Compounds (GIC) using the LiCl-KCl molten salts method, achieving intercalation of barium into the 2D graphitic galleries. X-ray diffraction measurements and ion beam analyses establish the chemical formulas for the compounds, including the stable & alpha;-phase and the more complex & beta;-phase. The intercalated sheets in the binary compound BaC6 are single-layered, while the & alpha;-phase has three-layered sheets and the & beta;-phase has six-layered sheets. The reaction mechanism suggests the intercalation process involves steps of lithium intercalation, barium replacement, and formation of the & alpha;-phase. The & alpha;-phase is found to be the most stable GIC in the LiCl-KCl molten medium.
Article
Chemistry, Multidisciplinary
Alejandro Medina, Ana I. Rodriguez, Carlos Perez-Vicente, Ricardo Alcantara
Summary: Nanoparticles of MgMn2-yFeyO4 have been prepared to improve the electrochemical behavior by replacing Mn3+ ions, and the presence of Fe3+ ions is found to facilitate the exchange reaction of magnesium ions and inhibit the disproportionation process. Electrochemical behavior in non-aqueous magnesium cells has been studied.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Electrochemistry
Christina Schmitt, Alexander Kube, Norbert Wagner, K. Andreas Friedrich
Summary: In this study, operando X-ray diffraction was used to observe phase changes of graphite during cycling at different temperatures. It was found that phase evolution is slower at lower temperatures, and differences in phase evolution between charge and discharge are more pronounced at 0 degrees C compared to higher temperatures.
Article
Chemistry, Physical
Guillermo Alvarez Ferrero, Gustav Avall, Katherine A. Mazzio, Youhyun Son, Knut Janssen, Sebastian Risse, Philipp Adelhelm
Summary: In this study, it was found that solvent co-intercalation can occur in layered materials such as titanium disulfide, in addition to graphite. Operando X-ray diffraction and dilatometry were used to investigate the storage mechanisms of different electrolyte solvents. Density functional theory was employed to explain the solvent co-intercalation phenomenon and its dependence on solvation shell stability. A proof-of-concept solvent co-intercalation battery was successfully demonstrated by pairing a TiS2 electrode with a graphite electrode.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shuo Feng, Rajesh Kumar Singh, Yucheng Fu, Zhuo Li, Yulong Wang, Jie Bao, Zhijie Xu, Guosheng Li, Cassidy Anderson, Lili Shi, Yuehe Lin, Peter G. Khalifah, Wei Wang, Jun Liu, Jie Xiao, Dongping Lu
Summary: In this study, a simple strategy was demonstrated for constructing low-tortuosity through-pores in both vertical and planar directions of electrodes by casting large particles into single-particle-layer electrodes. Through multi-scale characterizations and simulations, correlations between material/electrode structures, electrolyte permeability, polysulfide migration, and sulfur reactions were elucidated. The high-loading and dense sulfur cathode fabricated by this method delivers a high specific capacity at a very low electrolyte/sulfur ratio.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Crystallography
Yang-Su Han, In Park
Summary: In this study, CDEA was successfully intercalated into montmorillonite using both solution and solid-state reaction methods. The acid-base intralayer complexation was found to be responsible for the solid-state intercalation reaction.
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)