jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Bingfeng Zu | Song Chen | Qi Jin | Liang Wu
Source: Photocatalysis: research and potential (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Engineering of Cu-Based Quaternary Sulfide Nanomaterials for Photocatalytic Applications Semiconductor nanomaterials have been widely used as light-responsive photocatalysts for solar-to-fuel conversion over the past decade. However, the wide band gap of the most reported photocatalysts stems from light absorption in the visible region and results in low solar conversion efficiency. Therefore, it is necessary to develop new semiconductor nanomaterials with high absorption coefficients over the visible region as photocatalysts. The most promising candidates include Cu-based quaternary sulfide nanomaterials (CQSNs), such as Cu-II-III-S (e.g., CuZnInS, CuZnGaS), Cu-II-IV-S (e.g., Cu2ZnSnS4, Cu2ZnGeS4), and I-III-IV-S (e.g., CuInSnS4, Cu3GaSnS5). This review provides a comprehensive overview of the recent progress in developing CQSNs for various photocatalytic applications. Firstly, we present an overview of the synthesis of CQSNs with precise control over crystal phase, composition, size, and shape using solution-based methods. Then, the enhancement of photocatalytic performance was presented via the engineering of CQSNs, which included surface engineering, elemental doping, cocatalyst loading, vacancy engineering, and interface engineering. Subsequently, we further introduce the photocatalytic applications in the fields of photocatalytic and photoelectrochemical hydrogen conversion, CO2 reduction, organic synthesis, and pollutant degradation. Lastly, this review ends with views on the current challenges and opportunities of CQSNs in future studies. Quaternary ; Photocatalysis ; Sulfide ; Nanomaterials ; Materials science ; Nanotechnology ; Environmental science ; Geology ; Chemistry ; Metallurgy ; Catalysis ; Paleontology Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; Gas Sensing Nanomaterials and Sensors
Authors: Nikolai Vatin | Alok K. Pandey | Takveer Singh | Bhavuk Samrat | J. Lakshmi Prasanna | Soumita Talukdar
Source: E3S Web of Conferences (article, 2024-01-01)
Field: Chemistry — Organic Chemistry

Towards Sustainable Energy Conversion: Green Synthesis of Nanostructured Catalysts This work investigates the development, characterization, and evaluation of nanostructured catalysts intended especially for environmentally benign energy conversion. We developed nanostructured catalysts by modifying the sol-gel method and varying the precursor material and reaction conditions ratios. The morphological differences between the synthesised catalysts were shown. Among catalyst 3's best features were its large surface area and pore volume. Noteworthy activity and selectivity were shown by catalyst 3. Low overpotential was attained along with high current density and faradaic efficiency. The stability studies proved that Catalyst 3 was durable since, over many cycles, its electrochemical performance scarcely altered. The requirement of carefully adjusting the synthesis conditions to tailor nanostructured catalysts for specific energy conversion applications is highlighted by these findings. The main objectives going forward should be to enhance the processes involved in producing anything and to find novel chemical combinations that may accelerate the effective and environmentally benign conversion of energy. By addressing these problems, nanostructured catalysts have the potential to greatly progress renewable energy technology and lessen environmental impact worldwide. Catalysis ; Sustainable energy ; Materials science ; Nanotechnology ; Energy transformation ; Environmental science ; Business ; Renewable energy ; Chemistry ; Engineering ; Physics ; Organic chemistry Nanomaterials for catalytic reactions ; Electrocatalysts for Energy Conversion ; Advanced Photocatalysis Techniques
Authors: Bharti Bawanthade | Ashok Mistry | Nilesh S. Ugemuge | S. V. Moharil
Source: AIP conference proceedings (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Synthesis of Tb doped NaYF4 crystals by using solid state metathesis with different concentrations of Tb Tb3+ doped NaYF4 phosphor were prepared through solid state metathesis (SSM) method. As prepared sample was characterized by powder XRD technique, SEM and PL. The XRD data of the NaYF4 phosphor showed a single –phase FCC arrangement and space group Fm-3m. The Photoluminescence emission spectrum of NaYF4 activated with varied concentrations of Tb3+(0.5 to 5 mol %) using the excitation of unique wavelength 350nm exhibited prominent emission peaks at 544 nm assigned to the transition of 5D4→7F5. When activated with 3mol% of Tb3+ ions, the intense green colour emission obtained because of 5D4→7F5 transition at 544nm. These excellent optical Characteristics and their minimal cost and very efficient synthesis method offer the as-synthesized Tb3+:NaYF4 optical material have extreme capacity for industrial and general applications in white LED, when mixing with the blue and red optical materials . Phosphor ; Photoluminescence ; Materials science ; Doping ; Ion ; Analytical Chemistry (journal) ; Emission intensity ; Solid-state ; Nuclear chemistry ; Optoelectronics ; Chemistry ; Physical chemistry ; Organic chemistry Luminescence Properties of Advanced Materials ; Solid State Laser Technologies ; Perovskite Materials and Applications
Authors: Yuan Xu | Yuanjie Ma | Xinghua Chen | Kaiqing Wu | Kaiyuan Wang | Yanfei Shen | Songqin Liu | Xuejiao J. Gao | Yuanjian Zhang
Source: ChemRxiv (preprint, 2024-01-30)
Field: Materials Science — Materials Chemistry

Regulating Reactive Oxygen Intermediates of SAzyme via Second-Shell coordination for Selective Aerobic Oxidation Reactive oxygen species (ROS) regulation for artificial oxidoreductase is a key scientific issue that determines the activity, selectivity, and stability of aerobic reaction. However, the poor understanding of ROS formation mechanism greatly hampers their wider deployment. Herein, inspired by cytochromes P450 affording bound ROS intermediates in O2 activation, we report single-atom FeN4 site with tunable second-shell anion could regulate ROS generating pathways. Remarkably, the second-shell S anion coordinated FeN4 (denoted as FeNSC) delivers 2.4-fold higher oxidase-like activity and only 17% free ROS generation compared to FeNC. The detailed XANES analysis and DFT calculations reveal that the second shell S-doping significantly altered the electronic structure of FeN4 sites, leading to an increase of electron density at Fermi level and the enhanced electron transfer from active sites to the key intermediate *OOH, thereby determining the type of ROS in aerobic oxidation process. FeNC with different second-shell anion were further applied to drive aerobic oxidation reaction with enhanced activity, selectivity, and stability. Oxygen ; Chemistry ; Reactive oxygen species ; Shell (structure) ; Reactive intermediate ; Catalysis ; Biochemistry ; Materials science ; Organic chemistry Advanced Nanomaterials in Catalysis ; Advanced biosensing and bioanalysis techniques ; Nanocluster Synthesis and Applications
Authors: Amira Bencherif | Monique Tie | Richard Martel | Delphine Bouilly
Source: npj 2D Materials and Applications (article, 2024-08-11)
Field: Materials Science — Materials Chemistry

Automated and parallel transfer of arrays of oriented graphene ribbons Abstract The transfer of two-dimensional materials from their growth substrate onto application wafers is a critical bottleneck in scaling-up devices based on such nanomaterials. Here, we present an innovative approach to achieve the automated and simultaneous transfer of arrays of graphene ribbons, with precise control over their orientation and alignment onto patterned wafers. The transfer is performed in a simple, yet efficient apparatus consisting of an array of glass columns, strategically shaped to control ribbon orientation and arranged to match the destination wafer, coupled to a dual inflow/outflow pumping system. This apparatus enables the transfer of a custom array of parallel graphene ribbons in a fraction of the time required with traditional methods. The quality of the transferred graphene was evaluated using optical imaging, scanning electron microscopy, hyperspectral Raman imaging, and electrical transport: all consistently indicating that the transferred graphene exhibits excellent quality, comparable to a manual transfer by an expert user. The proposed apparatus offers several competitive advantages, including ease of use, high transfer throughput, and reduced nanomaterial consumption. Moreover, it can be used repeatedly on the same wafer to assemble arrays of overlayed materials with controlled relative orientations. This approach thus opens promising opportunities for the large-scale fabrication of various heterostructures and devices based on vertical assemblies of 2D nanomaterials. Graphene ; Transfer (computing) ; Materials science ; Computer science ; Nanotechnology ; Parallel computing Graphene research and applications ; Interconnection Networks and Systems ; Advanced Antenna and Metasurface Technologies
Authors: Athira Naniyil | Naveen Koroth Valappil | Alex P. Andrews | Sabapathi Gokulnath
Source: Chemical Communications (article, 2024-01-01)
Field: Chemistry — Spectroscopy

Carbazole-embedded <i>p</i>-benziporphyrinoid: synthesis, structure and a reversible chemodosimeter for mercury(<scp>ii</scp>) ions The first carbazole-embedded <i>p</i>-benziporphyrinoid is synthesized by a [3+1] acid-catalyzed condensation between appropriate coupling partners. The macrocycle 1 exhibited orange emission and showed a large Stokes shift of 5831 cm<sup>-1</sup>. Intriguingly, it shows a selective affinity towards Hg<sup>2+</sup> ions over other metal-ions in a reversible manner. Job's plot confirmed the 1 : 1 stoichiometry with unambiguous confirmation of both 1 and 1-Hg by single crystal X-ray analysis. Carbazole ; Mercury (programming language) ; Chemistry ; Ion ; Photochemistry ; Combinatorial chemistry ; Organic chemistry ; Computer science Molecular Sensors and Ion Detection ; Porphyrin and Phthalocyanine Chemistry ; Luminescence and Fluorescent Materials
Authors: Hyeong-Hun Park | Chul‐Hwan Kim | Tae-Gyeong Lee | Ju-Hyun Park | Min‐Sik Park | Jae Sang Lee
Source: Applied Sciences (article, 2024-10-10)
Field: Chemistry — Inorganic Chemistry

Effects of Zirconium-Based Crosslinkers with Different Zirconium Contents on Pigment Coating in Paper This study investigates the impact of zirconium-based KZC series crosslinkers with varying zirconium contents and the polyamine-based crosslinker (PBC) on the properties of coated paper, focusing on key performance metrics such as viscosity, wet rub and pick resistance, dry pick resistance, gloss, brightness, ink set-off, and print mottle. The findings reveal that crosslinkers’ type and concentration significantly influence the coating colors’ viscosity, with PBC demonstrating lower low shear viscosity at lower concentrations. The KZC series showed stable viscosity across a zirconium content range of 7% to 20%, and both crosslinker types enhanced wet rub resistance at higher concentrations. Notably, the KZC series, particularly KZC7, exhibited superior wet pick resistance at increased concentrations, highlighting its effectiveness in enhancing the durability of the coating layer. All crosslinkers maintained excellent dry pick resistance, ensuring robust coating performance. While gloss and brightness were generally unaffected, KZC20, which had the highest zirconium content, slightly reduced these optical properties. Ink set-off tests indicated that the KZC series performed better at lower concentrations, whereas higher concentrations led to increased ink set-off, potentially due to over-crosslinking. Print mottle remained consistent across all crosslinkers, indicating uniform coating quality. Overall, the zirconium-based KZC series significantly enhances wet resistance and maintains high performance across various properties, though it may slightly reduce gloss and brightness and increase ink set-off at higher concentrations. PBC offers a balanced performance profile, emphasizing the need for careful crosslinker type and concentration optimization to achieve the desired coating properties for specific applications. This comprehensive evaluation provides valuable insights for developing and optimizing high-performance coated papers. Zirconium ; Materials science ; Coating ; Pigment ; Chemical engineering ; Chemistry ; Nanotechnology ; Metallurgy ; Organic chemistry ; Engineering Pigment Synthesis and Properties ; Cultural Heritage Materials Analysis ; Dyeing and Modifying Textile Fibers
Authors: Huimin Peng | X Zeng | S S Li | Xin Wang
Source: Veterinary Medicine and Science (article, 2024-11-01)
Field: Materials Science — Materials Chemistry

A Novel <i>Cortex Phellodendri Chinensis</i>–Based Carbon Dots Platform for Remarkable Analgesia for Clinical Pain Management In this study, we explored the eco-friendly synthesis of photoluminescent CCDs employing a direct one-step pyrolysis process, utilizing natural Cortex Phellodendri Chinensis as the precursor material and studied their analgesic effect in mice. The synthesized carbon dots underwent comprehensive characterization through a range of spectroscopic and microscopic techniques. These included UV-Vis, FTIR, fluorescence spectroscopy and HR-TEM, DLS instruments. HR-TEM results exhibited the presence of homogenous spherical-shaped C-dots of about 3.3 nm without aggregates. Furthermore, the prepared CCDs were studied for their in vivo analgesic effect in mice by performing tail-immersion, hot plate and acetic acid writhing tests. Also, an MTT assay was performed to assess the in vitro cytotoxicity of CCDs against L929 cells. In vitro cytotoxicity studies revealed that L929 cells exhibited higher cell viability when treated with prepared CCDs. The cellular uptake studies revealed the phase contrast images of MG-63 cells at wavelength 488 nm clearly depicted the aggregation of green, fluorescent CCDs within the cells while leaving nuclei unobscured. In addition, to the best of our understanding, the results presented in this paper showed that CCDs exhibited an important analgesic effect and enhanced anti-nociceptive activity, which may be due to stimulation of the opioidergic system. Consequently, CCDs appear to be a viable analgesic alternative for traditional analgesic candidates in pain management. Analgesic ; Cytotoxicity ; In vitro ; Chemistry ; In vivo ; MTT assay ; Fluorescence ; Nuclear chemistry ; Nociception ; Viability assay ; Biophysics ; Pharmacology ; Biomedical engineering ; Biochemistry ; Medicine ; Biology ; Receptor Carbon and Quantum Dots Applications ; Nanocluster Synthesis and Applications ; Heavy Metal Exposure and Toxicity
Authors: Shunsuke Yamazaki | Kazutoshi Takahashi | Yutaka Matsuda
Source: ChemRxiv (preprint, 2024-01-17)
Field: Chemistry — Organic Chemistry

Tag-Free Protein Modification by Lipoate Ligase A: Exploring Substrate Tolerance This study delves into the functional intricacies of lipoate ligase A (LplA), an enzyme showing great promise in bioconjugation due to its unique capacity for introducing azido groups into proteins without requiring a genetic tag. We aimed to enhance the understanding of LplA's functionality, particularly its substrate tolerance and the reliability of various analytical techniques. A pivotal aspect of our approach was incorporating azido groups into a range of proteins, followed by the addition of the fluorescent molecule Cy3 via click chemistry. Analysis of fluorescent intensity in the altered proteins indicated varying degrees of conjugation. Additionally, phenyl resin-based RP-HPLC facilitated effective separation of modified proteins, unmodified proteins, and remaining fluorescent tags post-separation. SASA analysis provided insights into conjugation trends, guiding the identification of proteins amenable to LplA's tag-free modification. Our findings demonstrate LplA's broad substrate tolerability for protein modification. Bioconjugation ; DNA ligase ; Chemistry ; Biochemistry ; Substrate (aquarium) ; Fluorescence ; Sasa ; Small molecule ; Combinatorial chemistry ; Enzyme ; Biophysics ; Computational biology ; Biology Click Chemistry and Applications ; Biochemical and Molecular Research
Authors: Jie Guo | Ranjita K. Bose
Source: Langmuir (article, 2024-07-16)
Field: Chemistry — Organic Chemistry

Enhancing the Kinetics of Vapor-based Polymerization by Pulsed Filament Approach Initiated chemical vapor deposition is a versatile technique for synthesizing conformal polymer films on both planar and porous surfaces. It can retain functional groups and avoid undesired cross-linking. However, there is still room for enhancing its performance without altering the feed parameters. Here, we investigate a pulsed iCVD approach to improve the deposition process, achieved by switching on and off the resistively heated filament periodically. By strategically switching off the filament, a shortage of thermally activated primary radicals was created, which allowed uninterrupted chain propagation with fewer termination reactions and potentially increased monomer conversion rates. This has caused significantly faster deposition kinetics with a higher molecular weight and longer chain length for poly(glycidyl methacrylate) compared to continuous deposition. Spectra analyses confirmed that the functionality and stoichiometry ratios remained intact throughout the pulsed deposition process. The pulsed iCVD method is therefore a competitive and sustainable tool, demonstrating fast deposition kinetics and a well-preserved functionality. Kinetics ; Polymerization ; Protein filament ; Chemical engineering ; Materials science ; Chemistry ; Polymer chemistry ; Polymer ; Composite material ; Physics ; Engineering Advanced Polymer Synthesis and Characterization ; Polymer crystallization and properties ; Fiber-reinforced polymer composites
Authors: Steen Hansgaard Hansen | Christian D. Buch | Stergios Piligkos
Source: ChemRxiv (preprint, 2024-01-17)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Structural isomerism-tuned magnetisation relaxation dynamics in lanthanide coordination complexes The eigenspectrum and eigenvectors of the 2F7/2 ground multiplets of two structural isomer coordination complexes, Yb(trenovan) (H3trenovan = tris(((3-methoxysaliclidene)amino)ethyl)amine) and Yb(trenpvan) (H3trenpvan = tris(((5-methoxysaliclidene)amino)ethyl)amine), were determined by use of magnetometry and electron paramagnetic resonance and luminescence spectroscopies. The two 4f complexes crystallise in the trigonal 𝑃3̅ space group, have identical chemical formulas and differ only in the placement of the methoxy group on the aromatic ring of salicylaldehyde, with it being either ortho, Yb(trenovan), or para, Yb(trenpvan), to the phenoxo group. This structural isomerism is found to have a profound influence on the solid state static and dynamic magnetic properties of the complexes. In the bulk, both isomers display a combination of direct and raman magnetisation relaxation procceses, however, at vastly different rates. Magnetic dilution in an isostructural diamagnetic host supresses the occurrence of the direct procces suggesting that the direct process observed in the bulk originates from Yb(III) centres coupled by magnetic dipole interactions. The eigenspectrum, eigenvectors and spin lattice relaxation of Yb(trenpvan) are found to be closer to the ones found in Yb(trensal) (H3trensal = tris(((saliclidene)amino)ethyl)amine) where the methoxy group is substituted by an H atom, than to those of Yb(trenovan) where the methoxy group is in the ortho position. Thus, the position of chemical modifications has a tremendous influence on the static and dynamic solid state magnetic properties of 4f coordination complexes. Our detailed study on single crystals, demonstrates that the rarely studied effect of modifications of the position of second coordination sphere chemical groups on the dynamic magnetic properties can in fact be used to chemically tune the magnetisation dynamics of 4f spin systems. Chemistry ; Isostructural ; Crystallography ; Magnetization ; Lanthanide ; Amine gas treating ; Relaxation (psychology) ; Crystal structure ; Organic chemistry ; Physics Magnetism in coordination complexes ; Lanthanide and Transition Metal Complexes ; Metal-Catalyzed Oxygenation Mechanisms
Authors: Luca Cozzarini | Lucia Marsich | Alessio Ferluga
Source: Polymers (article, 2024-05-10)
Field: Materials Science — Polymers and Plastics

Scleroglucan-Based Foam Incorporating Recycled Rigid Polyurethane Waste for Novel Insulation Material Production This study details the synthesis and performance evaluation of a novel lightweight thermal and acoustic insulation material, resulting from the combination of a scleroglucan-based hydrogel and recycled rigid polyurethane waste powder. Through a sublimation-driven water-removal process, a porous three-dimensional network structure is formed, showcasing notable thermal and acoustic insulation properties. Experimental data are presented to highlight the material's performance, including comparisons with commercially available mineral wool and polymeric foams. This material versatility is demonstrated through tunable mechanical, thermal and acoustic characteristics, achieved by strategically adjusting the concentration of the biopolymer and additives. This adaptability positions the material as a promising candidate for different insulation applications. Addressing environmental concerns related to rigid polyurethane waste disposal, the study contributes to the circular economy. Materials science ; Polyurethane ; Thermal insulation ; Composite material ; Porosity ; Thermal ; Mineral wool ; Biopolymer ; Pipe insulation ; Waste management ; Polymer ; Vacuum insulated panel Polymer composites and self-healing ; Aerogels and thermal insulation ; Advanced Materials and Mechanics
Authors: Suguru Kuratomi | Satoshi Usui | Yoko Tatewaki | Hiroaki Usui
Source: IEICE Transactions on Electronics (article, 2024-10-07)
Field: Materials Science — Polymers and Plastics

Vapor Deposition of Naphthalenediimides Having Vinyl Groups Naphthalenediimide (NDI) derivatives without or with one or two vinyl groups were synthesized to prepare thin films by the vapor deposition. NDI with larger number of vinyl substitution tends to form thin films with poorer crystallinity and lower electrical conductivity. On the other hand, the vinyl modification is effective in improving film morphology and temporal stability. Electron-assisted deposition of the vinyl-substituted NDIs produces smooth and stable amorphous polymer films with a lower conductivity. The vinyl substitution brings about contradictory effects of improving film morphology and stability at a cost of reducing crystallinity and conductivity. The vinyl modification also enables controlling the film/substrate interface by covalent tethering via a self-assembled monolayer. Deposition (geology) ; Chemical vapor deposition ; Materials science ; Nanotechnology ; Geology Synthesis and properties of polymers ; Innovative Microfluidic and Catalytic Techniques Innovation ; Chemistry and Chemical Engineering