jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Shi‐Wei Yu | Zhonghao Li | Miao-Xin Li | Yu Zeng | Wan-Xin Ye | Jun Xie | Zhao‐Yang Wang
Source: Catalysts (article, 2024-11-11)
Field: Chemistry — Organic Chemistry

A Novel 2-Methylimidazole Promoted Oxyacyloxylation of α-Hydroxy Ketones and Anhydrides: An Easy Access to α-Acyloxy Ketones An efficient and operationally simple method for the synthesis of α-acyloxy ketones through the readily available 2-methylimidazole-promoted reaction of α-hydroxy ketones and anhydrides is developed. In the reaction, the anhydrides act as both a substrate and a solvent. The new method features good substrate tolerance, mild reaction conditions, readily accessible starting materials, and excellent yields, providing facile and green access to the targets. Importantly, the reaction also avoids the use of reagents with pungent odors, such as pyridine, in traditional esterification, which may promote the development of organocatalysis using nitrogen-containing heterocyclic compounds as catalysts. Chemistry ; Ketone ; Organic chemistry Chemical Synthesis and Reactions ; Oxidative Organic Chemistry Reactions ; Synthesis and Catalytic Reactions
Authors: Wen-Xuan Zhao | Lifeng Yang | Dan Yu | Feiyu Chen | Ling Liang | Jing-Yi Cao | Guang Yang | Shuhai Chen | Takehiko Yamato | Carl Redshaw | Chuan‐Zeng Wang
Source: New Journal of Chemistry (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Position-dependent hexaarylbenzene AIEgens: synthesis, characterization and optical properties Two TPE-fused hexaarylbenzene compounds exhibit obvious AIE-active properties and high luminescence efficiency. The position-dependent emission behavior indicates that this strategy can be used for the design of AIEgens with tunable properties. Chemistry ; Characterization (materials science) ; Position (finance) ; Nanotechnology Nonlinear Optical Materials Research ; Organic Electronics and Photovoltaics ; Luminescence and Fluorescent Materials
Authors: Meng Guo | Hongyu Yang | Jiawei Wang | Yajun Jian | Weiqiang Zhang | Ziwei Gao
Source: ChemCatChem (article, 2024-12-23)
Field: Chemistry — Inorganic Chemistry

CORM‐Mediated Pd‐Catalyzed Coupling Reactions: Ketone Synthesis and CO‐Releasing Mechanisms Abstract Palladium‐catalyzed carbonylative C─C coupling reactions provide an efficient route to synthesize natural products and pharmaceuticals through three‐component condensation processes. However, the use of gaseous carbon monoxide (CO) – a colorless, odorless, and toxic gas – has hindered its broad adoption as a C1 source. Addressing this, the development of versatile CO‐releasing molecules (CORMs) and user‐friendly, nongaseous palladium‐catalyzed carbonylation techniques have emerged as a crucial research area. This review outlines recent advancements in the application of CORMs to palladium‐catalyzed carbonylative C─C coupling reactions, with a focus on CO generation mechanisms and carbonyl utilization efficiency. CORMs are classified into three categories: single carbon monoxide releasing molecules ( s ‐CORMs), multiple carbon monoxide releasing molecules ( m ‐CORMs), and binary metal carbonyl compounds (BMCCs). By offering a comprehensive overview of the current research landscape and providing practical guidelines for CORM selection, this review aims to assist researchers in developing effective carbonylative strategies. Catalysis ; Mechanism (biology) ; Chemistry ; Ketone ; Carbonylation ; Coupling reaction ; Reaction mechanism ; Combinatorial chemistry ; Coupling (piping) ; Photochemistry ; Carbon monoxide ; Organic chemistry ; Materials science Asymmetric Hydrogenation and Catalysis ; Catalytic Cross-Coupling Reactions ; Carbon dioxide utilization in catalysis
Authors: Taehan Yeo | Kyungmin Kim | Jaeho Lee | Byungseok Seo | Seonghyun Park | Wonjoon Choi
Source: International Journal of Energy Research (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Studies toward Morphological Changes of Silver/Carbon Fiber Composites and Their Optimization for High‐Performance Electrochemical Electrodes The integration of micro/nanostructured metal/metal oxides with carbon‐based materials has emerged as a promising approach for developing electrochemical electrodes. However, the fabrication of such hybrids entails complex and multistep procedures involving the grain boundaries and interfaces between the constituent materials, thus, degrading the overall performance. Herein, we report a facile electrothermal process (ETP) for the scalable fabrication of hybrid carbon fiber (CF) sheets integrated with tunable morphology of silver micro/nanoparticles. The application of an electric field across the layered film, consisting of AgNO 3 and CF, enabled the rapid dissipation of thermochemical energy in an open‐air environment via ETP. The ETP facilitated ultrafast heat dissipation within a few milliseconds, leading to the rapid decomposition of AgNO 3 , which resulted in the formation of liquefied Ag on the CF surface affording a reduced Ag‐CF composite with adjustable structures through input power. The capability of ETP driven by controlling duration and number of electrical pulses was demonstrated by examining the corresponding physiochemical and electrochemical characteristics of the resulting composite. The Ag‐CF composite fabricated using three cycles of a screened ETP pulse (1500 W and 75 ms for power and duration) acted as a supercapacitor electrode demonstrating excellent area capacitance (13 F/cm 2 ) and exceptional capacitance retention (98% after 10,000 cycles). Thus, the utilization of ETP can provide manufacturing strategies enabling scalable synthesis of functional hybrids in vacuum‐free ambient environments within milliseconds. These hybrids possess unique interfaces and particle boundaries, exhibiting considerable potential for diverse electrochemical applications. Electrode ; Materials science ; Composite material ; Electrochemistry ; Fiber ; Carbon fibers ; Composite number ; Chemistry Supercapacitor Materials and Fabrication ; Advanced Sensor and Energy Harvesting Materials ; Transition Metal Oxide Nanomaterials
Authors: Shengmiao Liu | Jianhao Zhang | Wenjing Yan
Source: Nanomaterials (article, 2024-12-19)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Controllable Synthesis of Three-Dimensional Chiral Au Nanoflowers Induced by Cysteine with Excellent Biocompatible Properties Chiral molecules are ubiquitous in nature and biological systems, where the unique optical and physical properties of chiral nanoparticles are closely linked to their shapes. Synthesizing chiral plasmonic nanomaterials with precise structures and tunable sizes is essential for exploring their applications. This study presents a method for growing three-dimensional chiral gold nanoflowers (Au NFs) derived from trisoctahedral (TOH) nanocrystals using D-cysteine and L-cysteine as chiral inducers. By employing a two-step seed-mediated growth approach, stable chiral Au nanoparticles with customizable sizes, shapes, and optical properties were produced by adjusting the Au nanosphere (Au NP) seed concentration and cysteine dosage. These nanoparticles exhibited optical activity in both the visible and near-infrared regions, with a maximum anisotropy factor (<i>g</i>-factor) of 0.024. Furthermore, the PEG-modified chiral Au NFs demonstrated excellent biocompatibility. This approach provides a precise method for geometrically controlling the design of three-dimensional chiral nanomaterials, holding great potential for biomedical applications. Nanomaterials ; Materials science ; Biocompatibility ; Nanoparticle ; Nanotechnology ; Cysteine ; Biocompatible material ; Biomolecule ; Chemistry ; Organic chemistry Gold and Silver Nanoparticles Synthesis and Applications ; Nanocluster Synthesis and Applications ; Metamaterials and Metasurfaces Applications
Authors: Mangish Ghosh | Tirtha Mandal | Mattia Lepori | Joshua P. Barham | Julia Rehbein | Oliver Reiser
Source: ChemRxiv (preprint, 2024-04-22)
Field: Chemistry — Organic Chemistry

Electrochemical Homo- and Cross-Annulation of Alkynes and Nitriles for the Regio- and Chemoselective Synthesis of 3,6-Diarylpyridines We disclose a mediated electrochemical [2+2+2] annulation of alkynes with nitriles, forming substituted pyridines in a single step from low-cost, readily available starting materials. The combination of electrochemistry and a triarylamine redox mediator obviates the requirements of transition metals and additional oxidants. Besides the formation of diarylpyridine moieties via the homocoupling of two identical alkynes, the heterocoupling of two different alkynes depending on their electronic nature is possible, highlighting the unprecedented control of chemoselectivity in this catalytic [2+2+2] process. Mechanistic investigations like cyclic voltammetry and crossover experiments combined with DFT calculations indicate the initial oxidation of an alkyne as the key step leading to the formation of a vinyl radical cation intermediate. The utilization of continuous flow technology proved instrumental for an efficient process scale-up. The utility of the products is exemplified by the synthesis of π-extended molecules, being relevant for material or drug synthesis. Chemoselectivity ; Annulation ; Alkyne ; Electrochemistry ; Chemistry ; Combinatorial chemistry ; Cyclic voltammetry ; Catalysis ; Redox ; Molecule ; Nanotechnology ; Organic chemistry ; Materials science ; Electrode Radical Photochemical Reactions ; Catalytic C–H Functionalization Methods ; Sulfur-Based Synthesis Techniques
Authors: Marwa Galal zaima | Shadeed Gad | Hebaalla A Mahmoud
Source: Records of Pharmaceutical and Biomedical Sciences/Records of Pharmaceutical & Biomedical Sciences (article, 2024-05-01)
Field: Materials Science — Biomaterials

Cyclodextrin-Based Nanosponges as Novel Approach for Drug Delivery. Over the last two decades, the drug delivery market has witnessed the advent of nanotechnology. Nanotechnology involves developing and applying chemical, physical, and biological systems characterized by structures ranging from single atoms or molecules to submicron dimensions. It also consists of the integration of resulting nanostructures into larger systems. Medical nanotechnology has shown a growing inclination toward reducing costs and improving the efficacy of existing medications, diagnostic tools, implants, prosthetics, patient monitors, and personal healthcare. The primary objective has been to develop intelligent drug delivery systems to maximize activity and minimize side effects. This review focuses on nanostructured materials, a significant category of advanced nanotechnology-based carriers. Nanostructured materials include polymeric-based and lipid-based nano systems. The review provides an overview of recent variations in this classification, particularly emphasizing cyclodextrin nanosponges. Cyclodextrins are remarkable molecules owing to their unique amphiphilic structure, they are natural oligosaccharides that hold promise in more targeted and controlled drug delivery release. Drug delivery ; Cyclodextrin ; Drug ; Computer science ; Pharmacology ; Medicine ; Chemistry ; Materials science ; Nanotechnology ; Chromatography Nanoparticle-Based Drug Delivery ; Advanced Drug Delivery Systems ; Drug Solubulity and Delivery Systems
Authors: Alessia Ciogli | Antonia Iazzetti
Source: Catalysts (article, 2024-07-09)
Field: Materials Science — Materials Chemistry

Advances in Transition Metal Catalysis—Preface to the Special Issue Over the years, transition metal catalysis has had a significant impact on science and technology [...] Transition metal ; Nanotechnology ; Catalysis ; Chemistry ; Materials science ; Organic chemistry Catalytic Processes in Materials Science ; Nanomaterials for catalytic reactions ; Electrocatalysts for Energy Conversion
Authors: D Dhachinamoorthi | G Saivarun | Amanulla Sk | D Amulya | G Meghana | B. S. Sasidhar
Source: Journal of Innovations in Applied Pharmaceutical Science (JIAPS) (article, 2024-03-02)
Field: Materials Science — Materials Chemistry

Bioinspired methods for silver nanoparticle production: applications in biomedicine This review examines the green synthesis of silver nanoparticles using Cassia auriculata leaf and flower extracts. It outlines the extraction process, properties, and potential applications, with visual confirmation and scientific validation through UV-Visible spectroscopy, XRD, SEM, and Scherrer's formula. The AgNPs synthesized displayed unique Surface Plasmon Resonance, an optical property that enables them to produce specific colors. The further application of these nanoparticles was examined in formulating a bactericidal cold cream, which showed significant antibacterial potency against common pathogenic bacteria. The characterization of these nanoparticles spanned various technique usages, including UV-visible spectrometer, transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) analysis, Atomic force microscopy and high-resolution transmission electron microscopy are two techniques used for analyzing complex materials.The review confirms the potential of biosynthesized silver nanoparticles from Cassia auriculata in antibacterial formulations, emphasizing the need for further research to optimize eco-friendly processes and unlock novel applications, particularly in biomedicine. Biomedicine ; Nanotechnology ; Silver nanoparticle ; Nanoparticle ; Production (economics) ; Computer science ; Materials science ; Biochemical engineering ; Engineering ; Bioinformatics ; Biology Nanoparticles: synthesis and applications
Authors: Lokesh Yadav | Srimanta Pakhira
Source: arXiv (Cornell University) (preprint, 2024-04-14)
Field: Materials Science — Materials Chemistry

Nitrogen-monovacancy (VN) Hexagonal Boron Nitride 2D Monolayer Material as an Efficient Electrocatalyst for CO2 Reduction Reaction The conversion of waste carbon dioxide (CO2) gas into valuable products and fuels through an electrocatalytic CO2 reduction reaction (CO2RR) is a promising approach. The sluggish kinetics of the CO2RR require the development of novel strategies for electrocatalyst design. Two-dimensional (2D) materials emerge as promising candidates for CO2RR due to their distinctive electronic and structural properties. This study follows the first principles based DFT-D method to examine the electrocatalytic competences of the defective two-dimensional boron nitride monolayer (d-BN) material towards CO2RR. Introducing a particular defect with nitrogen vacancies in the 2D single layer pristine hexagonal boron nitride (VN_d-BN) can efficiently activate the CO2 molecules for hydrogenation by reducing the electronic band gap of the pristine hBN from 6.23 eV to 3.0 eV. Therefore, VN_d-BN material can act as a large band gap semiconductor. Our findings demonstrate that the defective regions in the 2D monolayer VN_d-BN serve as active sites (Boron) for both the adsorption and activation of CO2. The subsequent hydrogenation steps occur sequentially once the CO2 molecule is adsorbed on the catalytic surface. Our results indicate that the OCHO* path is the most favorable for CH4 production. Hence, the 2D monolayer VN_d-BN material holds a great promise as a cost-effective catalyst for CO2RR, and it presents a viable alternative to expensive platinum (Pt) catalysts. Monolayer ; Electrocatalyst ; Hexagonal boron nitride ; Materials science ; Catalysis ; Boron nitride ; Adsorption ; Boron ; Nitride ; Chemical engineering ; Redox ; Nanotechnology ; Band gap ; Inorganic chemistry ; Electrochemistry ; Chemistry ; Layer (electronics) ; Optoelectronics ; Physical chemistry ; Electrode ; Organic chemistry ; Metallurgy Advanced Thermoelectric Materials and Devices ; CO2 Reduction Techniques and Catalysts ; Supercapacitor Materials and Fabrication
Authors: Zichen Huang | Chen Fan | Qi Wang | Dingxiang Zhang | Hongdong Wang | Xiacong Zhang
Source: Polymers (article, 2024-12-12)
Field: Materials Science — Biomaterials

Facile Synthesis of Thermoresponsive Alternating Copolymers with Tunable Phase-Transition Temperatures A series of novel amphiphilic alternating CPEG copolymers were synthesized through an amine-epoxy click reaction comprising aliphatic amine and polyethylene glycol diglycidyl ether (PEGDE). These polymers were characterized in detail via nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) to confirm the successful synthesis. Due to their amphiphilic structure, these polymers display thermoresponsiveness, with tunable cloud points (Tcps) that are adjustable from 20.8 °C to 46.8 °C by altering the side-chain length of the aliphatic amine, varying the mixing ratios of copolymers, the solution's pH, and salt additions. This tunable thermoresponsive behavior positions CPEG copolymers as promising candidates for a range of functional material applications. Copolymer ; Materials science ; Thermogravimetric analysis ; Polymer chemistry ; Fourier transform infrared spectroscopy ; Polymer ; Polyethylene glycol ; Diglycidyl ether ; Gel permeation chromatography ; Amphiphile ; Thermoresponsive polymers in chromatography ; Amine gas treating ; Side chain ; Chemical engineering ; Phase (matter) ; Organic chemistry ; Epoxy ; Chemistry ; Reversed-phase chromatography ; Composite material biodegradable polymer synthesis and properties ; Advanced Polymer Synthesis and Characterization ; Hydrogels: synthesis, properties, applications
Authors: Zahraa Adnan Mohamed | Moataz Soliman | Ali Gad | Shaker Ebrahim | Yasmeen Elkony | Heavy Metal lab, Central labs of Ministry of Health, Alexandria, Egypt
Source: Integrated nano. (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Aminopropyl triethoxy silane capped ZnO quantum dots for highly selective dopamine Quantum dots (QDs) can be used as labels with fluorescent nanoprobes and ZnO QDs have a band gap over 4 eV with a large 60 meV exciton binding energy. Capped ZnO presents high quantum efficiency and surface enhancement in biochemical analysis and ultrasensitive detection of biomaterials and proteins. This work reported the synthesis of ZnO QDs capped with different agents of 3-aminopropyl triethoxy silane (APTES), tetraethyl orthosilicate (TEOS) and dimethyl sulfoxide (DMSO) from a nonaqueous medium. ZnO QDs were characterized by different techniques of UV-vis absorption spectra, fluorescent emission spectra, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Zeta potential and high-resolution transmission electron microscopy (HRTEM). Photoluminescence (PL) emissions illustrated that APTES capped ZnO QDs have the highest PL intensity and applied as an optical sensor for dopamine (DA) determination in an aqueous solution and real serum samples. The visible luminescence of ZnO may result from either the recombination of a delocalized electron with a deeply trapped hole or the recombination of a delocalized hole with a deeply trapped electron. Zeta potential values showed that the surface potentials of - 4.23, -7.70, -14, -1.94 mV for uncapped ZnO, DMSO, APTES capped, and TEOS capped ZnO QDs, respectively. The fluorescence quenching observed in ZnO QDs primarily stemmed from electron transfer between the ZnO QDs and two variants of dopamine: reduced dopamine acting as electron donors and oxidized dopamine-quinone serving as electron acceptors. APTES capped ZnO QDs probe exhibited a linear dynamic range from 6.2 – 0. 195 nM of DA with correlation coefficient (R2) of 0.99, limit of detection (LOD) of 0.2 nM and a sensitivity of 406.6 µM-1. Silane ; Dopamine ; Quantum dot ; Materials science ; Chemistry ; Chemical engineering ; Nanotechnology ; Organic chemistry ; Psychology ; Neuroscience Quantum Dots Synthesis And Properties
Authors: M. Rifai
Source: Egyptian Journal of Archaeological and Restoration Studies/Egyptian Journal of Archaeological and Restoration Studies  (article, 2024-12-01)
Field: Materials Science — Materials Chemistry

EVALUATION OF SELF-HEALING CORROSION PROTECTION USING BENZOTRIAZOLE-LOADED MESOPOROUS SILICA NANOCONTAINERS FOR APPLICATION ON ARCHAEOLOGICAL BRONZE ARTEFACTS This work evaluates the effectiveness of coating bronze coupons, with 3% Benzotriazole (BTA) -loaded nanocontainers mixed with Paraloid polymer. Mesoporous silica nanoparticles (MSNs) were prepared and loaded with 3% BTA (BTA@MSNs) followed by dispersion in 3% Paraloid B72 and B44. Bronze disc samples with the chemical composition of Cu 85%, Sn 10% and Pb 5% simulating archaeological artifacts were coated with a single and double layer of BTA@MSNs in Paraloid B72 and B44 and evaluated using several techniques. Colorimetric measurements (CM) were used to evaluate changes in the surface appearance following the coating with single and double protective layers. The corrosion inhibitive performance of the coating was investigated using electrochemical impedance spectroscopy (EIS). Transmission electron microscope (TEM) was performed to characterize the shape and size of the prepared SiO2 nanoparticles, while X-ray Diffraction (XRD) was performed to confirm the presence of amorphous mesoporous SiO2 nanoparticles. The specific surface area, pore volume and pore size distribution were measured by nitrogen adsorption– desorption technique, while the release rate of benzotriazole at various experimental pH values was estimated using UV–Vis spectroscopy. Results confirmed the sustained release of benzotriazole to varying pH levels. The release was higher with an increase in the pH of the medium, which signifies that the release rate rises in the alkaline medium. The best corrosion inhibitive performance was for the double layer BTA@MSNs – B72 samples at 91.73% efficiency, while single layer BTA@MSNs – B72 samples displayed the least change in color ΔE 3.28. Benzotriazole ; Bronze ; Corrosion ; Materials science ; Archaeology ; Metallurgy ; History Corrosion Behavior and Inhibition ; Building materials and conservation ; Cultural Heritage Materials Analysis