jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Zefeng Jiang | Tongyang Song | Bowen Huang | Chengjie Qi | Zhonghua Peng | Tong Wang | Yuliang Li | Linjing Ye
Source: Molecules (article, 2024-12-04)
Field: Chemistry — Analytical Chemistry

Hollow Biomass Adsorbent Derived from Platanus Officinalis Grafted with Polydopamine-Mediated Polyethyleneimine for the Removal of Eriochrome Black T from Water Platanus officinalis fibers (PFs) taking advantage of high-availability, eco-friendly and low-cost characteristics have attracted significant focus in the field of biomaterial application. Polyethyleneimine grafted with polydopamine on magnetic Platanus officinalis fibers (PEI-PDA@M-PFs) were prepared through a two-step process of mussel inspiration and the Michael addition reaction, which can work as an effective multifunctional biomass adsorbent for anionic dye with outstanding separation capacity and efficiency. The as-prepared PEI-PDA@M-PFs possess desirable hydrophilicity, magnetism and positive charge, along with abundant amino functional groups on the surface, facilitating efficient adsorption and the removal of Eriochrome Black T (EBT) dyes from water. In addition to the formation mechanism, the adsorption properties, including adsorption isotherms, kinetics, and the reusability of the absorbent, were studied intensively. The as-prepared PEI-PDA@M-PFs achieved a theoretical maximum adsorption capacity of 166.11 mg/g under optimal conditions (pH 7.0), with 10 mg of the adsorbent introduced into the EBT solution. The pseudo-second-order kinetic and Langmuir models were well matched with experimental data. Moreover, thermodynamic data ΔH > 0 revealed homogeneous chemical adsorption with a heat-absorption reaction. The adsorbent remained at high stability and recyclability even after five cycles of EBT adsorption processes. These above findings provide new insights into the adsorption processes and the development of biologic material for sustainable applications. Adsorption ; Biomass (ecology) ; Chemistry ; Nuclear chemistry ; Eriochrome Black T ; Chemical engineering ; Pulp and paper industry ; Organic chemistry ; Agronomy ; Biology Dye analysis and toxicity
Authors: David Eduardo E Flores-Prieto | Sarah E. Stabenfeldt
Source: Journal of Neural Engineering (review, 2024-12-01)
Field: Materials Science — Biomaterials

Nanoparticle targeting strategies for traumatic brain injury Nanoparticle (NP)-based drug delivery systems hold immense potential for targeted therapy and diagnosis of neurological disorders, overcoming the limitations of conventional treatment modalities. This review explores the design considerations and functionalization strategies of NPs for precise targeting of the brain and central nervous system. This review discusses the challenges associated with drug delivery to the brain, including the blood-brain barrier and the complex heterogeneity of traumatic brain injury. We also examine the physicochemical properties of NPs, emphasizing the role of size, shape, and surface characteristics in their interactions with biological barriers and cellular uptake mechanisms. The review concludes by exploring the options of targeting ligands designed to augment NP affinity and retention to specific brain regions or cell types. Various targeting ligands are discussed for their ability to mimic receptor-ligand interaction, and brain-specific extracellular matrix components. Strategies to mimic viral mechanisms to increase uptake are discussed. Finally, the emergence of antibody, antibody fragments, and antibody mimicking peptides are discussed as promising targeting strategies. By integrating insights from these scientific fields, this review provides an understanding of NP-based targeting strategies for personalized medicine approaches to neurological disorders. The design considerations discussed here pave the way for the development of NP platforms with enhanced therapeutic efficacy and minimized off-target effects, ultimately advancing the field of neural engineering. Traumatic brain injury ; Neuroscience ; Drug delivery ; Biomimetic materials ; Targeted drug delivery ; Modalities ; Computer science ; Medicine ; Nanotechnology ; Biology ; Materials science Nanoparticle-Based Drug Delivery ; RNA Interference and Gene Delivery ; Advanced biosensing and bioanalysis techniques
Authors: Amr M. Emara | Emad M. Elsharma | Islam M. Abdelmonem
Source: Journal of Radioanalytical and Nuclear Chemistry (article, 2024-10-24)
Field: Chemistry — Inorganic Chemistry

Adsorption of ytterbium(III) ions on ivy leaves marc: isotherm, kinetic and thermodynamic studies Abstract This study evaluates the performance of ivy leaves marc (ILM) in adsorbing 169 Yb(III) ions. Optimal adsorption occurred at a pH of 4 ± 0.2, a contact time of 24h, 169 Yb(III) concentration of 200mg/L, and a temperature of 298K. Kinetic analysis indicated that the adsorption process followed a pseudo-second-order model. Langmuir isotherm model best described the adsorption process, with a maximum capacity of 34.736mg/g. Thermodynamic analysis revealed that the adsorption process was spontaneous and endothermic. FTIR and SEM analysis of ILM before and after adsorption indicates that the adsorption process is due to the ion exchange mechanism. Ytterbium ; Adsorption ; Chemistry ; Kinetic energy ; Sorption isotherm ; Ion ; Thermodynamics ; Inorganic chemistry ; Physical chemistry ; Materials science ; Organic chemistry ; Physics Radioactive element chemistry and processing ; Adsorption and biosorption for pollutant removal ; Adsorption, diffusion, and thermodynamic properties of materials
Authors: Y. Ávila | Erick Ramírez | P. A. Morgado | Ilich A. Ibarra | J. Rodríguez‐Hernández | Jorge Balmaseda
Source: Journal of Thermal Analysis and Calorimetry (article, 2024-02-27)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Isoconversional analysis of thermally stimulated events on pillared cyanometallates Abstract We report the analysis, by the advanced isoconversional method of Vyazovkin, of the thermal events of pyridine molecule loss and spin crossover occurring in the two-dimensional compounds of molecular formulas: Fe(Pyridine) 2 [Fe(CN) 5 NO] and Fe(Pyridine) 2 [Ni(CN) 4 ]. Experimental thermogravimetric data were used to analyze the thermal evolution of pyridine molecules in both compounds. Calorimetry was used to study the spin crossover in Fe(Pyridine) 2 [Ni(CN) 4 ], while SQUID magnetometric for Fe(Pyridine) 2 [Fe(CN) 5 NO]. The analysis of the effective activation energy of the pyridine loss process suggested that, in both compounds, the thermal evolution of these molecules is highly influenced by the particle size due to the occurrence of a structural transformation of the gate-opening type. The effective activation energy of the latter technique applied to compound Fe(Pyridine) 2 [Ni(CN) 4 ] showed a behavior very similar to that expected for a solid–solid transition that occurs by the nucleation mechanism. The results obtained shed light on the way towards the application of the studied compounds in sensors and switches devises for molecular detection. Pyridine ; Thermogravimetric analysis ; Spin crossover ; Molecule ; Nucleation ; Activation energy ; Chemistry ; Thermal analysis ; Physical chemistry ; Crystallography ; Thermal ; Organic chemistry ; Thermodynamics Magnetism in coordination complexes ; Thermal and Kinetic Analysis ; Nonlinear Optical Materials Research
Authors: Muhammad Imran Khan
Source: Progress in Petrochemical Science (article, 2024-02-23)
Field: Chemistry — Analytical Chemistry

Utilization of NaOH Treated Rice Husk for Adsorptive Discharge of Eriochrome Black-T from an Aqueous Solution This article reports batch adsorption of Eriochrome Black-T (EBT) dye from an aqueous solution onto NaOH Treated Rice Husk (TRH).The morphology of untreated and treated rice husk was studied by Scanning Electron Microscopy (SEM).Adsorption of EBT from an aqueous solution onto TRH was demonstrated by using Fourier Transform Infrared (FTIR) spectroscopy.The effect of operational parameters on the percentage removal of EBT from an aqueous solution and adsorption capacity was investigated in detail.The adsorptive removal of EBT from aqueous solution was increased with contact time, mass of TRH and temperature while declined with initial concentration of EBT aqueous solution.Similarly, adsorption capacity was enhanced from 0.71 to 1.61mg/g, 1.61 to 17.0mg/g and 1.41 to 1.68mg/g with increase in contact time, initial concentration of EBT aqueous solution and temperature respectively while decreased from 6.17 to 1.61mg/g with increase in mass of TRH.Adsorption kinetic study showed that adsorption of EBT onto TRH fitted well to pseudo-second-order kinetics because the value of correlation coefficient (R 2 = 0.996) was close to unity.Adsorption isotherms including Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Tempkin were applied to experimental data.Results suggested that experimental data fitted well to Freundlich adsorption isotherm.Adsorption thermodynamics study indicated that adsorption of EBT onto Treated Rice Husk (TRH) was endothermic process because the value of enthalpy (H o = 20.57KJ/mol) was positive for it.Moreover, the negative values of Gibb's free energy indicated that adsorption of EBT onto TRH was spontaneous process. Husk ; Eriochrome Black T ; Aqueous solution ; Black rice ; Chemistry ; Nuclear chemistry ; Adsorption ; Botany ; Biology ; Organic chemistry Dye analysis and toxicity ; Water Quality Monitoring and Analysis
Authors: Claire Hotton | Yasine Sakhawoth | Anne‐Laure Rollet | Juliette Sireix-Plénet | Lingsam Tea | Sophie Combet | Melissa Sharp | Ingo Hoffmann | Frédéric Nallet | Natalie Malikova
Source: ChemRxiv (preprint, 2024-02-06)
Field: Chemistry — Physical and Theoretical Chemistry

Ion-specific effects in polyelectrolyte solutions: chain-chain interactions, chain rigidity and dynamics Ion-specific effects in aqueous solutions of polyelectrolytes are addressed here. We focus on ionene cationic chains, featuring simple structure, absence of side-groups and very regular chain charge density. Ion-specific effects in ionene solutions are demonstrated using a series of monovalent (halide) counterions. The study combines both static and dynamic measurements by small angle neutron scattering, neutron spin echo and PFG-NMR. Ion-specific effects are a phenomenon at high polyelectrolyte concentration and the nature of the counterion is seen to influence drastically the ionene chain-chain interactions. The origin lies in the closer approach of large, highly polarisable counterions to the chain backbone, leading to more constricted counterion clouds. Equally affected is the local chain rigidity, as well as collective and self-diffusion coefficients at larger scales. Small, nonpolarizable, strongly hydrating counterions, here F− ions, lead to locally rigid chains. For such chains, the nm-scale collective dynamics as seen by neutron spin echo, is the fastest, while the self-diffusion seen at μm scale by PFG-NMR is the slowest. In other words, the loss of charge on the chain due to ion-specific counterion ”condensation” has the opposite effect on collective diffusion and self-diffusion of the chains. Counterion ; Polyelectrolyte ; Chemistry ; Chemical physics ; Ion ; Neutron scattering ; Counterion condensation ; Neutron spin echo ; Diffusion ; Side chain ; Aqueous solution ; Crystallography ; Small-angle neutron scattering ; Neutron ; Physical chemistry ; Polymer ; Thermodynamics ; Organic chemistry ; Physics ; Quantum mechanics Electrostatics and Colloid Interactions ; Spectroscopy and Quantum Chemical Studies ; Material Dynamics and Properties
Authors: Kheloud Berramdane | María Isabel Lucío | Manuel G. Ramírez | Víctor Navarro‐Fuster | María‐José Bañuls | Ángel Maquieira | Marta Morales‐Vidal | Augusto Beléndez | Inmaculada Pascual
Source: ACS Applied Materials & Interfaces (article, 2024-08-26)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Storage Optimization of Transmission Holographic Gratings in Photohydrogels The development and optimization of holographic materials represent a great challenge today. These materials must be synthesized according to the characteristics that are desirable in photonic devices whose application is the object of investigation. In certain holographic sensors and biosensors, it is essential that the recording material be stable in liquid media. Furthermore, the holographic gratings stored in them must have temporal and structural stability, so that they can act as transducers of the analytical signal. Therefore, it is essential to optimize its storage in terms of the chemical composition of the material and the optical parameters of recording. This work focuses on the study of the storage optimization of unslanted transmission volume phase holograms in photohydrogels based on acrylamide and <i>N</i>,<i>N'</i>-methylenebis(acrylamide). Hydrogel matrices, also composed of acrylamide and <i>N</i>,<i>N'</i>-methylenebis(acrylamide), with different degrees of cross-linking were used and analyzed by scanning electron microscopy and UV-visible spectroscopy. The best results in terms of diffraction efficiency were reached for hydrogel matrices with an acrylamide/<i>N</i>,<i>N'</i>-methylenebis(acrylamide) molar ratio between 19.9 and 26. This relationship was also optimized in the incubator solution used to incorporate the components necessary for the formation of the holograms in the hydrogel matrices. The maximum diffraction efficiency, about 35%, was achieved when using an incubation solution with an acrylamide/<i>N</i>,<i>N'</i>-methylenebis(acrylamide) molar ratio of 4.35. The influence of the physical thickness of the hydrogel layers, the intensity, and the exposure time on the diffraction efficiency was also investigated and optimized. In addition, the behavior of the hologram was analyzed after a washing stage with PBST. A simple model that considered the effects of bending and attenuation of holographic gratings was proposed and used to obtain the optical parameters of the holograms. Materials science ; Holography ; Transmission (telecommunications) ; Holographic data storage ; Optoelectronics ; Optics ; Computer science ; Telecommunications Liquid Crystal Research Advancements ; Photonic and Optical Devices ; Electrowetting and Microfluidic Technologies
Authors: Stevan Stupar | Pavel Otřísal | Negovan Ivanković | Dušan Mijin | Marija M. Vuksanović | Radmila Jančić Heinemann | Aleksandra Samolov
Source: Science of Sintering (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Sintered magnesium ferrite particles in decolorization of anthraquinone dye AV109: Combination of adsorption and fenton process Magnesium ferrite (MgFe2O4) particles were synthetized by sol-gel method and used in the decolorization of the Acid Violet 109 (anthraquinone dye, AV109) water solutions' by combination of adsorption and heterogeneous Fenton process. The material's morphology and elemental analysis of the surface were revealed by Scanning electron microscopy and Energy Dispersive Spectroscopy (SEM/EDS). The X-Ray Diffraction (XRD) technique was used to analyze the crystallographic phase. In the first part of the decolorization experiment, the adsorption ability of the synthesized particles was investigated. During the adsorption study influence of pH was investigated. In the second part of the decolorization experiment, the effects of the various parameters on the Fenton process were studied such as the initial concentrations of hydrogen peroxide, dye, and magnesium ferrite particles. Influence of magnesium ferrite particles structure, pH value and reaction temperature were also investigated. The decolorization reaction was followed by UV-Visible (UV-Vis) spectrophotometry. At optimal conditions, the dye decolorization was 99.1% (55.4% by adsorption and 43.7% by the Fenton process). Both the adsorption and the Fenton process obey second-order kinetics. Adsorption ; Scanning electron microscope ; Hydrogen peroxide ; Magnesium ; Ferrite (magnet) ; Anthraquinone ; Materials science ; Spectrophotometry ; Chemical engineering ; Nuclear chemistry ; Chemistry ; Inorganic chemistry ; Metallurgy ; Chromatography ; Composite material ; Organic chemistry Magnetic Properties and Synthesis of Ferrites ; Pigment Synthesis and Properties ; Advanced oxidation water treatment
Authors: Hui Hu | Sizhuo Yu | Tian Wang | Chenguang Lv
Source: Journal of Chemical Technology & Biotechnology (article, 2024-02-02)
Field: Chemistry — Inorganic Chemistry

Efficient and selective separation of Re(VII), an analogue of Tc(VII), by a defective biochar with honeycomb‐like porous structure Abstract BACKGROUND In this study, a defective biochar with honeycomb‐like porous structure (BC‐PH) was successfully prepared by the activation of pristine biochar derived from bamboo shoot shell with the chemical reagent KOH, and was applied to selectively separate ReO 4 − (a chemical analogue for radioactive TcO 4 − ) from acidic solutions. RESULTS The diffusion, mass transfer and recovery for ReO 4 − could be significantly improved by the large specific surface area ( S BET , 2412 m 2 g −1 ) and high total volume ( V tot , 1.26 cm 3 g −1 ) of BC‐PH. The influence of adsorbent dosage, system pH and coexisting ions with different valence states on the adsorption capability and selectivity of BC‐PH toward ReO 4 − was systematically investigated. BC‐PH exhibited high adsorption capacity and selectivity for ReO 4 − with a maximal sorption capacity ( q m ) of 73.11 mg g −1 at initial pH 2. By applying an analysis of kinetics and isotherm adsorption studies, the liquid film diffusion was verified to be the primary rate‐controlling step for the sorption of ReO 4 − and the multilayer adsorption process occurred on the heterogeneous surface of BC‐PH. Besides, the recovery of ReO 4 − using BC‐PH occurred in an exothermic and spontaneous manner according to thermodynamic analysis. Furthermore, an investigation of the adsorption mechanism suggested that pore filling and electron donor–acceptor interaction were mainly related to the removal of ReO 4 − . CONCLUSION These results suggest that BC‐PH has great potential for the application of TcO 4 − separation in consideration of its high adsorption capacity and selectivity. © 2024 Society of Chemical Industry (SCI). Biochar ; Honeycomb ; Porosity ; Chemical engineering ; Materials science ; Separation (statistics) ; Chemistry ; Composite material ; Computer science ; Engineering ; Pyrolysis Radioactive element chemistry and processing ; Extraction and Separation Processes ; Chemical Synthesis and Characterization
Authors: Yuji Arakawa | Kazuharu Uchiyama | Kingo Uchida | Makoto Naruse | Hirokazu Hori
Source: Communications Materials (article, 2024-03-01)
Field: Materials Science — Materials Chemistry

History-dependent nano-photoisomerization by optical near-field in photochromic single crystals Abstract The history dependence of physical systems is promising for solving complex problems. To exploit spontaneous nanometre-scale optical memory for computation, the history dependence must be elucidated. Here, we demonstrate history-dependent or dynamic nano-photoisomerization through the sequential formation of multiple memory pathways in photochromic crystals via optical near-field interactions. Incident photons passing through photoisomerization memory pathways are observed using a double-probe optical near-field microscope, with one probe located on the front surface for local excitation and the other on the rear surface for near-field observations. By performing localised near-field excitation twice but at spatially different positions, negatively correlated near-field output patterns are observed between the first and second memory pathways. We also confirm that the first memory pathway is preserved after the formation of the second memory pathway. This result indicates that photoisomerization using an optical near field in diarylethene crystals has a history dependence, leading to brain-like dynamic information memorisation. Photoisomerization ; Photochromism ; Nano- ; Field (mathematics) ; Materials science ; Optics ; Photochemistry ; Optoelectronics ; Nanotechnology ; Chemical physics ; Chemistry ; Physics ; Isomerization ; Composite material ; Catalysis ; Organic chemistry Photochromic and Fluorescence Chemistry ; Neurobiology and Insect Physiology Research ; Photoreceptor and optogenetics research
Authors: Yadan Wu | Wenchen Zhao | Yang Liu | Haitao Liu | Minglong Yang | Xun Sun
Source: Polymers (article, 2024-09-10)
Field: Materials Science — Polymers and Plastics

Study on Thermal Oxygen Aging Characteristics and Degradation Kinetics of PMR350 Resin The thermal stability and aging kinetics of polyimides have garnered significant research attention. As a newly developed class of high thermal stability polyimide, the thermal aging characteristics and degradation kinetics of phenylene-capped polyimide prepolymer (PMR350) have not yet been reported. In this article, the thermo-oxidative stability of PMR350 was investigated systematically. The thermal degradation kinetics of PMR350 resin under different atmospheres were also analyzed using the Flynn-Wall-Ozawa method, the Kissinger-Akahira-Sunose method, and the Friedman method. Thermogravimetric analysis (TGA) results revealed that the 5% thermal decomposition temperature (Td5%) of PMR350 in a nitrogen atmosphere was 29 °C higher than that in air, and the maximum thermal degradation rate was 0.0025%/°C, which is only one-seventh of that observed in air. Isothermal oxidative aging results indicated that the weight loss rate of PMR350 and the time-dependence relationship follow a first-order exponential growth function. PMR350 resin thermal decomposition reaction under air atmosphere includes one stage, with a degradation activation energy of approximately 57 kJ/mol. The reaction model g(α) fits the F<sub>2</sub> model, and the integral form is given by g(α) = 1/(1 - α). In contrast, the thermal decomposition reaction under a nitrogen atmosphere consists of two stages, with degradation activation energies of 240 kJ/mol and 200 kJ/mol, respectively. The reaction models g(α) correspond to the A<sub>2</sub> and D<sub>3</sub> models, with the integral forms represented as g(α) = [-ln(1 - α)]<sup>2</sup> and g(α) = [1 - (1 - α)<sup>1/3</sup>]<sup>2</sup> due to the oxygen accelerating thermal degradation from multiple perspectives. Moreover, PMR350 resin maintained high hardness and modulus even after thermal aging at 350 °C for 300 h. The results indicate that the resin exhibits excellent resistance to thermal and oxygen aging. This study represents the first systematic analysis of the thermal stability characteristics of PMR350 resin, offering essential theoretical insights and data support for understanding the mechanisms of thermal stability modification in PMR350 and its engineering applications. Activation energy ; Thermogravimetric analysis ; Thermal stability ; Thermal decomposition ; Materials science ; Kinetics ; Degradation (telecommunications) ; Isothermal process ; Polyimide ; Nitrogen ; Decomposition ; Chemical engineering ; Composite material ; Chemistry ; Thermodynamics ; Physical chemistry ; Organic chemistry Synthesis and properties of polymers ; Epoxy Resin Curing Processes ; Polymer Nanocomposites and Properties