Article
Nanoscience & Nanotechnology
Mariam Khachani, Samuel Stealey, Ether Dharmesh, Mohammad S. Kader, Steven W. Buckner, Paul A. Jelliss, Silviya Petrova Zustiak
Summary: Hydrogels have tunability and biocompatibility, but are not good at delivering small molecules due to high burst release and rapid diffusion. Nanosilicate clays can improve this issue by slowing down the release kinetics. In this study, the adsorption of small molecules onto three nanoclays (Laponite, montmorillonite, and halloysite) was characterized, and the addition of nanoclays significantly slowed down the release of small molecules from hydrogels.
ACS APPLIED NANO MATERIALS
(2022)
Article
Energy & Fuels
Ehab S. Ali, Ahmed A. Askalany, K. Harby, Mohamed Refaat Diab, Bahgat R. M. Hussein, Ahmed S. Alsaman
Summary: This study experimentally expressed the benefits of using acid activated montmorillonite as a new adsorbent material in adsorption desalination-cooling systems. The results showed efficient adsorption characteristics and significant salt removal capabilities of acid activated montmorillonite.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Zhou Fang, Huang Suhua, Liu Xu, Feng Jian, Liu Qi, Wang Zhiwei, Li Chuanchang, Xu Yuanlai
Summary: In this study, montmorillonite (Mt) was modified to enhance its adsorption capacity of rare earth ions (RE3+). The adsorption capacity of RE3+ on modified Mt was found to be influenced by the initial concentration and temperature, with the adsorption process being controlled by chemisorption. The pseudo-second-order model accurately represents the adsorption kinetics, and the process is determined to be a spontaneous endothermic process through thermodynamic studies.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Polymer Science
Marcos Blanco-Lopez, Alvaro Gonzalez-Garcinuno, Antonio Tabernero, Eva M. Martin del Valle
Summary: Studied the rheological behavior of Laponite(R) with different polysaccharides in salt-free solutions, showing that higher polymer concentration affects viscosity, strain rate, elastic and viscous moduli, indicating a significant impact of Laponite(R) on shear flow behavior.
Article
Materials Science, Multidisciplinary
C. McNamara, J. M. Rickman, H. M. Chan
Summary: The study investigates the microstructural evolution that initiates from a compositionally inhomogeneous patterned structure in solid-state reactions and uses reaction-diffusion formalism to model the process. By connecting the spatio-temporal evolution of the product phase with the geometry and chemistry of the starting duplex structure, a better understanding of reaction kinetics and product microstructures is obtained. The results can be used to select templates judiciously to promote the formation of desirable microstructures and quantify important experimental kinetic parameters.
Review
Instruments & Instrumentation
Filipa Mascarenhas-Melo, Diana Peixoto, Carolina Aleixo, Maria Beatriz S. Goncalves, Faisal Raza, Kiran D. D. Pawar, Francisco Veiga, Mingxian Liu, Ana Claudia Paiva-Santos
Summary: Nanotechnology is increasingly used to manage wound healing, with nanoclays showing great potential in improving traditional wound healing approaches or new therapies. Nanoclays possess intrinsic properties that promote hemostatic response, anti-inflammatory effects, angiogenesis, and re-epithelization. This review focuses on the use of nanoclays in treating skin lesions, post-surgical wounds, burn wounds, and chronic ulcer skin wounds. Research studies and databases have shown the effectiveness of nanoclays in wound healing, but further in vivo toxicity studies are required.
DRUG DELIVERY AND TRANSLATIONAL RESEARCH
(2023)
Article
Chemistry, Physical
Guo-qiang Feng, Wen-de Tian
Summary: The desorption of a self-propelling filament from an attractive surface was studied using computer simulations, investigating the effects of activity, chain length, and chain rigidity. Different scaling regimes were observed for the desorption time versus activity for a flexible filament, with varying scaling exponents. The desorption behavior at low activity was found to be influenced by spiral-like detachment kinetics, while at high activity, the desorption process resembled the escape mechanism of a super-diffusive blob from a potential well at a short time scale. The desorption time was also influenced by chain length and chain stiffness, with non-monotonic behaviors observed.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Electrochemistry
Yuanyuan Liu, Koichi Jeremiah Aoki, Jingyuan Chen
Summary: The voltammetry of hydrogen ion at a thin wire platinum electrode was quantitatively revisited, revealing that the first reduction wave is inconsistent with the Volmer step as it is caused by the reduction of adsorbed hydrogen ions. The second reduction wave consists of partially-diffusion control current and negatively capacitive current associated with the redox reaction.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Tamas Pajkossy
Summary: A theory is proposed to analyze voltammograms and dynamic electrochemical impedance spectroscopy (dEIS) measurements of diffusion-hindered adsorption processes. The theory allows for the calculation of adsorption kinetics and isotherm parameters from a set of voltammograms taken at different scan-rates. The theory also includes the analysis of high frequency impedance spectra measured during potential scans. The presented theory synthesizes previous theories on diffusion-controlled charge transfer and adsorption, and supports the determination of rate coefficients as a function of electrode potential using fast dEIS measurements.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Saeed Bagherifam, Trevor C. Brown, Christopher M. Fellows, Ravi Naidu, Sridhar Komarneni
Summary: Clays modified by cationic surfactants such as HDPy+-M and HDPy+-Z showed promising adsorption capabilities for antimonite removal from aqueous solutions. The adsorption capacity was high, with selective adsorption in the presence of competitive anions like Cl- and SO42-. The kinetics of adsorption were well-described by the pseudo-second-order model, indicating efficient removal of Sb(III) by both materials.
APPLIED CLAY SCIENCE
(2021)
Editorial Material
Developmental Biology
Shigeru Kondo
Summary: The Turing model, a mathematical model that explains autonomy in the morphogenesis of organisms, has gained acceptance among experimental embryologists. It has been used to conceptualize and experimentally explore biological phenomena, as well as being incorporated into complex 3D models.
Article
Energy & Fuels
Ruchi Lamba
Summary: This paper investigates the esterification reaction of decanoic acid with ethanol using Amberlyst 15 solid catalyst. The catalytic stability behavior is studied by comparing the structures of fresh and reused catalysts. The effect of initial activities on reaction rate is examined using the group contribution method. The results show that the reaction kinetics of this reaction follow the Eley-Rideal mechanism.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Review
Chemistry, Multidisciplinary
Mohammed Benjelloun, Youssef Miyah, Gulsun Akdemir Evrendilek, Farid Zerrouq, Sanae Lairini
Summary: The increased environmental awareness and tighter regulatory standards have led various industries to seek appropriate wastewater treatment technologies for colored wastewater. This review provides detailed information on dyes, their classification, the environmental impact of water pollution, and the use of adsorption technology as a sustainable solution for dye removal. Studies evaluating the effectiveness of different adsorbents, particularly low-cost ones, in removing dyes from aqueous solutions are highlighted.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Physics, Fluids & Plasmas
F. Ampuero, M. O. Hase
Summary: In this study, we investigate the temporal evolution of the degree of a given vertex in a network by mapping the dynamics into a random walk problem in degree space. We analyze when the degree approximates a preestablished value through a parallel with the first-passage problem of random walks. The method is illustrated on the time-dependent versions of the Erdos-Renyi and Watts-Strogatz models, and an analytic form for the first and second moments of the first-passage time is obtained, showing their dependence on the size of the network.
Article
Chemistry, Inorganic & Nuclear
Gholamreza Ebrahimzadeh-Rajaei
Summary: This study investigated the adsorption of reactive red-P2B dye on montmorillonite clay as a cost-effective inorganic adsorbent. The montmorillonite clay was characterized using various analytical techniques. Factors such as pH, adsorbent dosage, initial concentration, and contact time were evaluated. The adsorption capacity of the dye decreased with increasing pH and temperature, and the Freundlich model provided the best fit for the adsorption data.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Koeli Ghoshal, Punit Jain, Rafik Absi
Summary: In this study, a one-dimensional unsteady suspended sediment transport model considering hindered settling and mixing length effects has been developed. The resulting highly nonlinear partial differential equation has been solved numerically using generalized boundary conditions and validated against existing works and laboratory data.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Chemistry, Physical
Abdeslem Bouzina, Malika Berredjem, Sofiane Bouacida, Khaldoun Bachari, Christelle Marminon, Marc Le Borgne, Zouhair Bouaziz, Yousra Ouafa Bouone
Summary: A series of new sulfamoyloxyoxazolidinone (SOO) derivatives were synthesized and characterized. The chemical reactivity and geometrical characteristics of the compounds were studied using experimental and computational methods. Molecular docking simulation revealed the potential binding and inhibitory activity of an active SOO molecule against the main protease of SARS-CoV-2. Additionally, the absorption, distribution, metabolism, excretion, and toxicity (ADMET) properties of the synthesized molecules were predicted.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Review
Chemistry, Medicinal
Caroline Bayart, Angelique Mularoni, Nada Hemmani, Soumeya Kerachni, Joachim Jose, Patrice Gouet, Joseph Paladino, Marc Le Borgne
Summary: Tetanus toxin fragment C (TTFC) is a potential alternative protein with neurological properties and immunogenicity in drug discovery and vaccine preparation. This article provides a systematic review of TTFC, including its structural features, properties, production methods, and extensive uses in the field of drug discovery.
Review
Chemistry, Physical
Brigitte Grosgogeat, Alina Vaicelyte, Remy Gauthier, Christine Janssen, Marc Le Borgne
Summary: This review analyzed the cytocompatibility of Co-Cr dental alloys. In vitro studies indicated that Co-Cr alloys have good cytocompatibility compared to Ni alloys, while in vivo studies found that Co-Cr rarely causes allergic reactions and irritation, except for individuals allergic to Co or Cr. Further research on titanium-based materials is needed for better results.
Article
Chemistry, Medicinal
Laura Goracci, Alessandra Nurisso, Emile Roussel, Basile Peres, Vincent Chaptal, Pierre Falson, Christelle Marminon, Joachim Jose, Marc Le Borgne, Ahcene Boumendjel
Summary: Human breast cancer resistance protein (BCRP), also known as ABCG2, plays a crucial role in tumor cells' resistance to multiple drugs. In this study, the researchers used computer-aided drug design (CADD) to guide the design of effective ABCG2 inhibitors. The FLAPpharm method was employed to understand the pharmacological features of one of the ABCG2 binding sites involved in regulating the transporter's ATPase activity. The model was evaluated using three predicted compounds, which showed high inhibitory activity against BCRP in the nanomolar range for the best compound.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Article
Engineering, Mechanical
Sumit Sen, Snehasis Kundu, Rafik Absi, Koeli Ghoshal
Summary: This study investigates the simultaneous distribution of suspended sediment concentration and streamwise velocity in an unsteady, uniform, one-dimensional sediment-laden open-channel flow. Theoretical models incorporating stratification and hindered settling effects have been developed and numerically solved. The results show the influence of different factors on concentration profiles and their evolution over time.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Mechanical
Punit Jain, Snehasis Kundu, Koeli Ghoshal, Rafik Absi
Summary: This study investigates the vertical profile of streamwise velocity in an unsteady and nonuniform open-channel turbulent flow by deriving velocity distribution from the RANS equation directly and validating the model with experimental data.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Engineering, Marine
Rafik Absi, Hitoshi Tanaka
Summary: This study parameterizes the turbulence viscosity in the wave bottom boundary layer using an exponential-type model, which is validated and calibrated by experimental data. The model is used to describe the suspended sediment concentration and sediment diffusivity over wave ripples, and shows good agreement with experimental data.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Fatiha Belmahdi, Mourad Lazri, Fethi Ouallouche, Karim Labadi, Rafik Absi, Soltane Ameur
Summary: This study proposes a technique based on Dempster-Shafer Theory (DST) to combine three classifiers (Artificial Neural Network, Support Vector Machine, and Random Forest) in order to improve precipitation estimation in North Algeria. Using data from SEVIRI radiometer on board MSG, the three classifiers are applied to classify precipitation scenes into three classes. The DST-ANN/SVM/RF method shows better performance compared to the separate use of the three classifiers and other combination techniques. It achieves a correlation coefficient of 0.96, higher than techniques combining six, three, two, or a single classifier.
REMOTE SENSING APPLICATIONS-SOCIETY AND ENVIRONMENT
(2023)
Article
Water Resources
Rafik Absi
Summary: In environmental flows, there are two concentration profiles observed for suspended sediments: a main upward concave profile and a near-bed upward convex profile for coarse sediments. Two 1-DV models, namely the classical advection-diffusion equation (ADE) and the kinetic model, are considered in this study. The results show that the kinetic model reverts to the classical ADE with an apparent settling velocity or sediment diffusivity. Numerical tools are provided for accurate resolution of the ADE for both sediment diffusivity and hindered settling. The concentration profiles obtained from the models show good agreement with experimental data. The shapes of the concentration profiles are interpreted based on two criteria for steady open-channel flows and a generalization is proposed for oscillatory flows over sand ripples.
Article
Physics, Multidisciplinary
Walid Tarraf, Diogo Queiros-Conde, Patrick Ribeiro, Rafik Absi
Summary: This paper proposes a geometric model to describe intermittency and verifies it using the entropic skin theory. The results show that our suggested fractal model adequately describes intermittency, which is consistent with the entropic skin theory and the analysis of reversibility efficiency.
Editorial Material
Chemistry, Medicinal
Marc Le Borgne, Pierre Falson, Ahcene Boumendiel
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Article
Engineering, Mechanical
Penghui Yang, Rong Wang, Hanguang Fu, Rafik Absi, Rachid Bennacer, Xuhui Yang, Peiqing La
Summary: This study aims to investigate the wear properties of titanium microalloying Carbidic Austempered Ductile Iron (CADI) and the refining mechanism of TiC on M3C carbides through theoretical calculation and experimental analysis. Wet rubber wheel wear tests showed that TiC particles could precipitate in the melt to refine the M3C eutectic carbides, and the M3C (010)/TiC (011) interface remained stable. Experimental results demonstrated the formation of TiC particles, and the shape of M3C eutectic carbides changed from net-like to strip-like after titanium microalloying, thereby improving the wear resistance of CADI.
Article
Water Resources
Yacine Mohia, Rafik Absi, Mourad Lazri, Karim Labadi, Fethi Ouallouche, Soltane Ameur
Summary: This study used three machine learning-based regression models (K-NNR, SVR, and RFR) to estimate rainfall from MSG satellite data. Daytime and nighttime rain gauge data were used for training and validation. The outputs of the three models were combined using the weighted average to optimize the results. The combined model showed significant improvement in rainfall predictions compared to other methods.
Article
Physics, Fluids & Plasmas
Carmine Di Nucci, Rafik Absi
Summary: This article focuses on the fully developed turbulent flow in circular pipes and channels. It provides a comparison of the mean velocity profiles and computes the values of global indicators for low-to-moderate Reynolds numbers. The study deduced the mean velocity profiles for channel flow using an indirect turbulent model and extracted information from a direct numerical simulation database for pipe flow. A one-to-one comparison of these values at identical Reynolds numbers offers insights into the differences between pipe and channel flows, highlighting deviations among mean velocity profiles extracted from different pipe databases.
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)