jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Xing Zhong | Nan Lv | Meicheng Zhang | Yubin Tan | Qiaozhulin Yuan | Caixia Hu | Mingyang Ma | Yongchuan Wu | Jinbo Ouyang
Source: Crystals (article, 2023-10-14)
Field: Chemistry — Inorganic Chemistry

Magnetic β-Cyclodextrin Polymer Nanoparticles for Efficient Adsorption of U(VI) from Wastewater It is a central issue to eliminate radioactive uranium (U(VI)) efficiently from water. In this manuscript, β-cyclodextrin was cross-linked with 2,3,5,6-tetrafluoro-1,4-benzenedicarbonitrile, and then a carboxylation reaction was used to prepare porous cross-linked polymers rich in carboxyl groups (CA-PCDPs). Subsequently, magnetic nanoparticles (MNPs) were loaded onto the CA-PCDPs via coprecipitation, and magnetic porous β-cyclodextrin polymer nanoparticles (CA-PCDP@MNPs) were successfully obtained, which were used for efficient elimination of U(VI) from nuclear wastewater solution. Moreover, SEM, FTIR, VSM, BET, and XRD were employed to investigate the CA-PCDP@MNP and found that it had a well-developed porous structure, high specific surface area, and abundant oxygen-containing functional groups (carboxyl, hydroxyl, C-O-C, Fe-O, etc.), providing sufficient active sites for chelating uranyl ions. Experiments illustrated that the CA-PCDP@MNP had efficient removal ability for U(VI), and the maximum theoretical adsorption amount for U(VI) reached 245.66 mg/g at pH 6.0 and 303 K. Moreover, the adsorption process was more suitable for the quasi second-order kinetic model and Langmuir adsorption isotherm model, indicating that the adsorption process was chemical adsorption. Meanwhile, the CA-PCDP@MNPs also exhibited fast response magnetic recovery ability and excellent regeneration and recycling ability. In addition, the data of the adsorption mechanism demonstrated that oxygen-containing functional groups, which were rich on the surface of CA-PCDP@MNPs, were the main binding active sites of U(VI). From the above results, it can be deduced that the CA-PCDP@MNP has a good application prospect in the practical application of nuclear wastewater treatment. Adsorption ; Uranyl ; Chemistry ; Langmuir adsorption model ; Magnetic nanoparticles ; Nuclear chemistry ; Nanoparticle ; Polymer ; Coprecipitation ; Chemical engineering ; Inorganic chemistry ; Organic chemistry ; Ion Radioactive element chemistry and processing ; Extraction and Separation Processes ; Chemical Synthesis and Characterization
Authors: Claudia Ana Maria Patrichi | Doinița Roxana Cioroiu Tîrpan | Ali A. Abbas Aljanabi | Bogdan Trică | Ioana Cătălina Gîfu | Tănase Dobre
Source: Polymers (article, 2023-12-11)
Field: Materials Science — Biomaterials

Extraction of Cellulose from Ulva lactuca Algae and Its Use for Membrane Synthesis Green algae are a sustainable source of biopolymers for the global demand due to their high photosynthetic efficiency. This article describes the extraction of cellulose from plant systems represented by <i>Ulva lactuca</i> species. In order to extract various substances, algae were finely ground with the help of solvents (liquid media). This was carried out to achieve the necessary conditions that help reduce the resistance this phase shows in regard to the transport and transfer of the species being extracted. The highest yield of extracted cellulose (20,944%) was obtained for the following factors: S/L = 1/20; conc. ethanol = 90%, conc. salts = 4 g/L. Hydrogel membranes are a unique class of macromolecular networks that contain a large fraction of aqueous solvent within their structure. With the cellulose extracted from algae, we obtained membranes which underwent the process of swelling in liquid media (ethyl alcohol) of different concentrations. The swelling of biocellulose membranes in alcoholic solutions of high concentrations was investigated. It was observed that the process of absorption of the alcoholic solution by the membrane occurred rapidly in the first part. After stabilization, the membranes continued to absorb at a slower rate until stabilization or saturation concentration was reached. Membrane ; Extraction (chemistry) ; Cellulose ; Solvent ; Chromatography ; Chemistry ; Ulva lactuca ; Chemical engineering ; Solubility ; Ethanol ; Swelling ; Algae ; Nuclear chemistry ; Botany ; Organic chemistry ; Biochemistry ; Biology Diatoms and Algae Research ; Seaweed-derived Bioactive Compounds ; Aerogels and thermal insulation
Authors: Gilad Yahav | Shweta Pawar | Yitzchak Weber | Bar Atuar | Hamootal Duadi | Dror Fixler
Source: Journal of Biomedical Optics (article, 2023-05-23)
Field: Materials Science — Materials Chemistry

Imaging the rotational mobility of carbon dot-gold nanoparticle conjugates using frequency domain wide-field time-resolved fluorescence anisotropy SignificanceWide-field measurements of time-resolved fluorescence anisotropy (TR-FA) provide pixel-by-pixel information about the rotational mobility of fluorophores, reflecting changes in the local microviscosity and other factors influencing the fluorophore’s diffusional motion. These features offer promising potential in many research fields, including cellular imaging and biochemical sensing, as demonstrated by previous works. Nevertheless, θ imaging is still rarely investigated in general and in carbon dots (CDs) in particular.AimTo extend existing frequency domain (FD) fluorescence lifetime (FLT) imaging microscopy (FLIM) to FD TR-FA imaging (TR-FAIM), which produces visual maps of the FLT and θ, together with the steady-state images of fluorescence intensity (FI) and FA (r).ApproachThe proof of concept of the combined FD FLIM/ FD TR-FAIM was validated on seven fluorescein solutions with increasing viscosities and was applied for comprehensive study of two types of CD-gold nano conjugates.ResultsThe FLT of fluorescein samples was found to decrease from 4.01 ± 0.01 to 3.56 ± 0.02 ns, whereas both r and θ were significantly increased from 0.053 ± 0.012 to 0.252 ± 0.003 and 0.15 ± 0.05 to 11.25 ± 1.87 ns, respectively. In addition, the attachment of gold to the two CDs resulted in an increase in the FI due to metal-enhanced fluorescence. Moreover, it resulted in an increase of r from 0.100 ± 0.011 to 0.150 ± 0.013 and θ from 0.98 ± 0.13 to 1.65 ± 0.20 ns for the first CDs and from 0.280 ± 0.008 to 0.310 ± 0.004 and 5.55 ± 1.08 to 7.95 ± 0.97 ns for the second CDs. These trends are due to the size increase of the CDs-gold compared to CDs alone. The FLT presented relatively modest changes in CDs.ConclusionsThrough the combined FD FLIM/ FD TR-FAIM, a large variety of information can be probed (FI, FLT, r, and θ). Nevertheless, θ was the most beneficial, either by probing the spatial changes in viscosity or by evident variations in the peak and full width half maximum. Fluorescence ; Fluorophore ; Rotational diffusion ; Fluorescence-lifetime imaging microscopy ; Materials science ; Colloidal gold ; Anisotropy ; Fluorescence anisotropy ; Nuclear magnetic resonance ; Microscopy ; Rotational correlation time ; Microviscosity ; Analytical Chemistry (journal) ; Nanoparticle ; Optics ; Nanotechnology ; Chemistry ; Physics Carbon and Quantum Dots Applications ; Advanced Fluorescence Microscopy Techniques ; Quantum Dots Synthesis And Properties
Authors: Alexandre Nau | Rémy Pointecouteau | Mélissandre Richard | T. Belin | Fabien Can | Clément Comminges | Nicolas Bion
Source: Catalysis Communications (article, 2023-05-26)
Field: Materials Science — Materials Chemistry

Catalytic methane combustion at low temperatures over YSZ-supported metal oxides: Evidence for lattice oxygen participation via the use of C18O2 Catalytic methane combustion was carried out over YSZ, Pd/YSZ and Rh/YSZ between 200 and 700 °C. Despite similar light-off curves for Pd/YSZ and Rh/YSZ between 200 and 450 °C, isotopic exchange experiments using CD4 and 18O2 revealed different behaviour of both supported catalysts regarding the activation of reactant molecules. The use of C18O2 isotopic gas was shown to be more appropriate than 18O2 to evaluate the bulk oxygen mobility in YSZ at low temperatures. The exchange of gaseous CO2 with lattice YSZ oxygen atoms, which occurs via surface hydrogen carbonate intermediate species, allowed to demonstrate the contribution of bulk oxygen atoms of YSZ in Rh/YSZ at low temperatures. Yttria-stabilized zirconia ; Catalysis ; Methane ; Oxygen ; Hydrogen ; Inorganic chemistry ; Combustion ; Materials science ; Metal ; Chemistry ; Chemical engineering ; Cubic zirconia ; Physical chemistry ; Metallurgy ; Organic chemistry Catalytic Processes in Materials Science ; Catalysis and Oxidation Reactions ; Advancements in Solid Oxide Fuel Cells
Authors: Zhenyu Jing | Yanhui Li | Yang Zhang | Mingzhen Wang | Bing Chen | Yaohui Sun | Kewei Chen | Qiuju Du | Xinxin Pi | Yuqi Wang | Shiyong Zhao | Yonghui Jin
Source: ChemistrySelect (article, 2023-05-23)
Field: Chemistry — Analytical Chemistry

Effective Removal of Congo Red from Water using Chitosan@UiO‐67 Hydrogel Spheres: Synthesis, Characterization and Adsorption Mechanisms Abstract A hydrogel (Chitosan@UiO‐67) adsorbent was prepared by a green and simple method for the adsorption of Congo red. SEM, FT‐IR, TGA, BET, and XRD were used to characterize CS@UiO‐67 hydrogel. The effects of temperature, initial CR concentration, contact time, pH, and adsorbent dose on the adsorption properties of CS@UiO‐67 hydrogel were studied in batch adsorption experiments. FT‐IR analysis showed that the hydroxyl group of chitosan had covalent coordination with Zr, which enhanced the stability of chitosan after complexation with UiO‐67. As for the adsorption experiment, the maximum adsorption capacity of the adsorbent calculated by the Langmuir model was 1001.2 mg ⋅ g −1 at room temperature (301 K). Kinetic analysis showed that the adsorption of congo red on CS@UiO‐67 hydrogel conformed to the pseudo‐second‐order model. The adsorption process accorded with the Langmuir model by isotherm analysis. Thermodynamic analysis showed that the adsorption process was spontaneous and exothermic. The adsorption of CR on CS@UiO‐67 hydrogel spheres was mainly attributed to electrostatic attraction, hydrogen bonds, and π‐π bonds. After four cycles of regeneration, the material removal rate can still reach about 65 %. The new adsorbent has good application prospects. Adsorption ; Congo red ; Langmuir adsorption model ; Hydrogen bond ; Chitosan ; Chemistry ; Chemical engineering ; Exothermic reaction ; Nuclear chemistry ; Materials science ; Organic chemistry ; Molecule Dye analysis and toxicity ; Adsorption and biosorption for pollutant removal ; Gold and Silver Nanoparticles Synthesis and Applications
Authors: Zeng Liu | Pietro Lenarda | J. Reinoso | Marco Paggi
Source: International Journal for Numerical Methods in Engineering (article, 2023-03-13)
Field: Materials Science — Materials Chemistry

A multifield coupled thermo‐chemo‐mechanical theory for the reaction‐diffusion modeling in photovoltaics Abstract A comprehensive coupled thermo‐chemo‐mechanical modeling framework is proposed in this work to study the reaction‐diffusion phenomena taking place inside photovoltaics (PV). When exposed to hygrothermal conditions, the encapsulant ethylene‐ co ‐vinyl acetate (EVA) layers undergo chemical degradation that significantly influences the overall PV performance. Aiming at efficient thermo‐mechanical modeling, the coupled displacement‐temperature governing equations for the EVA layers are formulated, and its 3D finite element (FE) implementation is derived in detail. Subsequently, the chemical reaction‐diffusion processes occurring in the EVA layers are described, and the corresponding numerical implementation is formulated with the consideration of spatial and temporal variation of diffusivity and chemical kinetic rates. Specifically, the thermo‐mechanical solution accounting for the heat generation from chemical reactions is projected to the FE model of the reaction‐diffusion system in order to determine the kinetic rates and diffusion coefficients for its subsequent analysis. The proposed modeling method is applied to simulate the evolution of reaction‐diffusion species at different damp heat tests, and predictions show a very satisfactory agreement with the analytical solution and experimental electroluminescence images taken from the literature. Its capabilities to predict the spatio‐temporal variation are demonstrated through the simulation of the humidity freeze test, where the cyclic temperature boundary condition is imposed. With this modeling framework, it is possible to evaluate the degradation of PV modules under varying environmental boundary conditions, thus providing a guideline to design new products tailored for specific climatic zones. Diffusion ; Materials science ; Boundary value problem ; Thermal diffusivity ; Finite element method ; Photovoltaics ; Thermodynamics ; Work (physics) ; Mechanics ; Photovoltaic system ; Mechanical engineering ; Engineering ; Physics Thermal properties of materials ; Phase Change Materials Research ; Solar Thermal and Photovoltaic Systems
Authors: Zoulikha Djamaa | Redouane Chebout | Khaldoun Bacharı | Djahida Lerari
Source: ChemistrySelect (article, 2023-11-08)
Field: Materials Science — Materials Chemistry

Microwave‐Assisted Soft Method for Synthesis of Poly (Acrylic Acid)/Organo‐clay Composites: Application As Superabsorbent For Phenol and Cr (VI) Abstract A series of superabsorbent composites (PAA/HDTMA‐MMT) based on poly (acrylic acid) (PAA) and different content of organo‐modified natural clay HDTMA‐MMT (1,3 and 5 wt.%) were synthesized via in‐situ radical polymerization using microwave method. This eco‐friendly route was chosen to avoid the use of toxic solvents and reduce polymerization time. In addition, it can be considered an efficient approach for industrial‐scale polymer synthesis. The microstructure of the obtained hydrogels was evidenced by Fourier transformation infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and scanning electron microscopy (SEM). Thermal stability was examined according to nano‐filler content on the matrix. The composite (PAA/HDTMA‐MMT) at 3 wt % exhibits an important swelling capacity value (833.33 g g −1 ). The efficiency of the synthesized hydrogel composites for phenol and Cr (VI) uptakes from aqueous solutions was studied in batch experiments. The main reason for their selection is their remarkable industrial use, despite their high toxicity and persistence in the environment. In order to underline the mechanism of the phenol and Cr (VI) adsorptions on the (PAA/HDTMA‐MMT), respectively, the zeta potential of the hydrogel was evaluated. Maximum adsorption capacity values of 170.7 mg g −1 and 197.3 mg g −1 were screened for phenol and Cr(VI), respectively. The adsorption process concurs with pseudo‐second‐order kinetics and with the Langmuir isotherm equation. A very high adsorption capacity (q max =225.2 mg g −1 ) and a correlation coefficient of 0.998 calculated from isotherm equations show the high efficiency of the adsorbent and thus expected to be a good adsorbent candidate for wastewater treatment. The thermodynamic studies evidenced the exothermic character of the adsorption reactions of the studied pollutants. Acrylic acid ; Materials science ; Adsorption ; Swelling capacity ; Langmuir adsorption model ; Fourier transform infrared spectroscopy ; Polymerization ; Aqueous solution ; Superabsorbent polymer ; Chemical engineering ; Phenol ; Thermal stability ; Nuclear chemistry ; Composite material ; Polymer ; Swelling ; Chemistry ; Organic chemistry Layered Double Hydroxides Synthesis and Applications ; Adsorption and biosorption for pollutant removal ; Polymer Nanocomposites and Properties
Authors: Ming Wang | Jing Li | Chunbo Zhang | Guoming Liu | Simone Napolitano | Dujin Wang
Source: Langmuir (article, 2023-02-20)
Field: Materials Science — Materials Chemistry

Physical Aging of Polystyrene Confined in Anodic Aluminum Oxide Nanopores We investigated the glassy dynamics of polystyrene (PS) confined in anodic aluminum oxide (AAO) nanopores by differential scanning calorimetry. Based on the outcome of our experiments, we show that the cooling rate applied to process the 2D confined PS melt has a significant impact on both the glass transition and the structural relaxation in the glassy state. A single glass transition temperature (<i>T</i><sub>g</sub>) is observed in quenched samples, while slow-cooled PS chains show two <i>T</i><sub>g</sub>s corresponding to a core-shell structure. The former phenomenon resembles what is observed in freestanding structures, while the latter is imputed to the adsorption of PS onto AAO walls. A more complex picture was drawn for physical aging. In the case of quenched samples, we observed a non-monotonic trend of the apparent aging rate that in 400 nm pores, reaches a value almost twice as larger than what is measured in bulk and decreases upon further confinement in smaller nanopores. For slow-cooled samples, by adequately varying the aging conditions, we were able to control the equilibration kinetics and either separate the two aging processes or induce an intermediate aging regime. We propose a possible explanation of these findings in terms of distribution in free volume and the presence of different aging mechanisms. Nanopore ; Polystyrene ; Glass transition ; Materials science ; Differential scanning calorimetry ; Anodic Aluminum Oxide ; Kinetics ; Oxide ; Aluminium ; Relaxation (psychology) ; Chemical physics ; Chemical engineering ; Composite material ; Chemistry ; Nanotechnology ; Thermodynamics ; Polymer ; Metallurgy Material Dynamics and Properties ; Photonic Crystals and Applications ; Theoretical and Computational Physics
Authors: Chiara De Luca | Yannick Krauke | Svea Stephan | Giorgia Greco | Greta Compagnin | Alessandro Buratti | Alberto Cavazzini | Martina Catani | Simona Felletti
Source: Green Analytical Chemistry (article, 2023-07-11)
Field: Chemistry — Spectroscopy

Green cannabigerol purification through simulated moving bed chromatography Cannabigerol (CBG) is a minor cannabinoid present in Cannabis sativa L. This molecule is gaining increasing popularity thanks to its antibacterial, antimicrobial, antidepressant and antitumoral properties. In parallel, there is growing attention towards the search of efficient, cost-effective, rapid, high-throughput, and green purification techniques. In this work, CBG has been purified from a real cannabis extract by means of simulated moving bed chromatography. The proposed application is very promising, allowing to achieve a CBG extract free of tetrahydrocannabinol (a psychoactive cannabinoid) with 100% recovery and 97% final purity by using a faster and greener method if compared to traditionally used ones. Chemistry ; Cannabinoid ; Chromatography ; Cannabis sativa ; Antimicrobial ; Biochemistry ; Biology ; Organic chemistry ; Botany Analytical Chemistry and Chromatography ; Protein purification and stability ; Microfluidic and Capillary Electrophoresis Applications
Authors: Jagoda Budnik | Aleksandra Mielewczyk‐Gryń | Maria Gazda | Tadeusz Miruszewski
Source: Journal of Materials Chemistry A (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

Water uptake kinetics and electrical transport in BaCe<sub>0.6</sub>Zr<sub>0.2</sub>Y<sub>0.1</sub>M<sub>0.1</sub>O<sub>3−<i>δ</i></sub> (M = Tb, Pr, Fe) protonic conductors BaCe 0.6 Zr 0.2 Y 0.1 M 0.1 O 3− δ (M = Fe, Pr, Tb) is a mixed conducting oxide in which three mobile charge carriers – oxygen ions, electrons/holes, and protonic defects – are present. Kinetics ; Ion ; Oxide ; Materials science ; Oxygen ; Electron ; Charge carrier ; Analytical Chemistry (journal) ; Chemistry ; Physics ; Optoelectronics ; Metallurgy Advancements in Solid Oxide Fuel Cells ; Electronic and Structural Properties of Oxides ; Magnetic and transport properties of perovskites and related materials
Authors: Xin Ke | Bingqing Xie | Zhong Wang | Jingguo ZHANG | Jianwei Wang | Zhanrong Li | Huijun He | Limin Wang
Source: Journal of Inorganic Materials (article, 2023-11-28)
Field: Materials Science — Polymers and Plastics

Progress of Interconnect Materials in the Third-generation Semiconductor and Their Low-temperature Sintering of Copper Nanoparticles Materials science ; Sintering ; Copper ; Interconnection ; Semiconductor ; Nanoparticle ; Metallurgy ; Nanotechnology ; Engineering physics ; Optoelectronics Synthesis and properties of polymers ; Nanomaterials and Printing Technologies ; Additive Manufacturing and 3D Printing Technologies
Authors: A. Ahmed | Walaa A. Hassan | Mohamed Abdel-Moneim Mohamed | Ezzat A. Ahmed | Nagih M. Shaalan | Mostafa R. Abukhadra
Source: Scientific Reports (article, 2023-09-23)
Field: Chemistry — Inorganic Chemistry

Ultra-fast adsorption of radioactive technetium (99mTc) by using mining waste clay samples, Abu-Tartur, Egypt In this study, we have opened a great route to fabricate a high-performance nanocomposite for various functional applications based on the composite of a natural stone. A clay sample (black shale (B.Sh)) was collected from the Abu-Tartur area in Egypt. The black shale was organically modified with organic materials in our laboratory, which is called organo-black shale (O-B.Sh). The samples were characterized by XRD, FTIR, SEM, and XRF. These techniques confirmed that the samples have multi-oxide phases with approximately SiO<sub>2</sub> at 54.1%, Al<sub>2</sub>O<sub>3</sub> at 24.73%, Fe<sub>2</sub>O<sub>3</sub> at 6.02%, K<sub>2</sub>O at 1.12%, MgO at 1.09%, and Na<sub>2</sub>O of 0.09%, as calculated by XRF. The two samples were applied to the adsorption processes of the radioactive technetium materials, which have been used for the medical treatment of the cancer institute of Upper Egypt. The adsorption processes were performed at various concentrations of the radioactive material and various amounts of clay samples. The as-collected B.Sh sample showed an adsorption activity of 65%, however, the organically modified materials showed a high adsorption rate toward technetium reaches to 100% in a very short time and without any further process. The present collected materials are very promising to withdraw the radioactive materials from the saline solution to save human and environmental health. We believe these multi-compound composites may open a new approach for creating new fabric composites with high performance for various applications. Technetium ; Radioactive waste ; Radiochemistry ; Environmental science ; Chemistry ; Nuclear chemistry Radioactive element chemistry and processing ; Chemical Synthesis and Characterization ; Nuclear materials and radiation effects