jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Renzhen Fan | Cheng Wang | Xiaofei Zhang | Xuwen Zhang | Weijia Dong | Yiyang Xu | Chenhui Xu | Chunyan Chi | Jun Zhu | Yunfeng Deng | Yanhou Geng
Source: Advanced Energy Materials (article, 2024-08-12)
Field: Materials Science — Polymers and Plastics

Crystalline 1D Linear Conjugated Polymers with a Quinoidal Unit As Metal‐Free Electrocatalysts for Oxygen Reduction Abstract Crystalline and soluble 1D linear conjugated polymers (LCPs) have garnered considerable interest as cost‐effective and efficient metal‐free electrocatalysts for the oxygen reduction reaction (ORR) due to their high exposure of catalytic sites and ease of processing. However, difficulties remain in achieving excellent ORR performance for 1D LCPs by conventional molecular design. Herein, it is demonstrated the utilization of quinoidal units as a promising strategy to develop 1D LCPs for ORR. The incorporation of quinoidal unit not only results in polymers with strong inter‐ and intra‐molecular interactions and low‐lying LUMO (lowest unoccupied molecular orbital) energy levels, but also provides polymers with good crystallinity and commendable charge carrier mobilities. The electronic properties of these polymers are fine‐tuned through the introduction of additional heteroatoms and/or substituents in the monomers and comonomers to understand and optimize their ORR catalytic activity. Evaluation of their catalytic performances reveals a remarkable half‐wave potential and limiting current density of up to 0.74 V (vs reversible hydrogen electrod) and 7.50 mA cm −2 , respectively. Notably, these performances are achieved without the addition of carbon nanomaterials as support. This study offers a new insight into the design of highly efficient metal‐free organic electrocatalysts. Materials science ; Heteroatom ; Conjugated system ; Polymer ; HOMO/LUMO ; Catalysis ; Crystallinity ; Monomer ; Metal ; Nanotechnology ; Chemical engineering ; Combinatorial chemistry ; Organic chemistry ; Molecule ; Chemistry ; Ring (chemistry) Conducting polymers and applications ; Fuel Cells and Related Materials ; Perovskite Materials and Applications
Authors: Jens Van Hoorde | Nezha Badi | Filip Du Prez
Source: Polymer Chemistry (article, 2024-01-01)
Field: Materials Science — Polymers and Plastics

Scalable design of uniform oligourethanes for impact study of chain length, sequence and end groups on thermal properties The full potential of sequence-defined macromolecules remains unexplored, hindered by the difficulty of synthesizing sufficient amounts for the investigation of the properties of such uniform structures and their derived materials. Herein, we report the bidirectional synthesis and thermal behavior analysis of sequence-defined oligourethanes. The synthesis was conducted on a large scale (up to 50 grams) using a straightforward protocol, yielding uniform macromolecules as validated by NMR, ESI-MS and SEC. With this approach, a library of uniform oligourethanes (up to the octamers) was produced using two structural units: a hydrogen-bonding carbamate and a methyl-substituted alternative structure. By varying the chain length, monomer sequence and functionality, we were able to perform a systematic study of the impact of hydrogen bonding on the thermal properties of polyurethanes. Thermal analysis of the discrete oligomers using DSC revealed that both the molecular weight and microstructure significantly affect the glass transition and melting temperatures. TGA measurements also revealed differences in the thermal stability of the oligomers, underscoring the significance of the primary structure of polyurethanes. Additionally, the influence of the terminal groups on the degradation pathway was assessed <i>via</i> pyrolysis-GC-MS, which specifically highlighted the increased thermal stability in the absence of hydroxyl end groups. This work shows the interest of using sequence-defined synthetic macromolecules for the elucidation of structure-property relationships and thereby facilitates their fine-tuning towards specific material applications. Sequence (biology) ; Chain (unit) ; Scalability ; Thermal ; Computer science ; Chemistry ; Mathematics ; Materials science ; Physics ; Thermodynamics ; Biochemistry Polymer composites and self-healing ; Polymer crystallization and properties ; Photochromic and Fluorescence Chemistry
Authors: Amit Chauhan | Satyam Singh | Atresh Kumar Singh | Alok Kumar Singh | Sushil Kumar | Rajesh K. Yadav | Atul P. Singh | U. N. Tripathi | Manoj Kumar
Source: Coordination Chemistry Reviews (article, 2024-11-21)
Field: Chemistry — Organic Chemistry

Photocatalytic oxidation of various organic substrates using multinuclear Ru(II)-polypyridyl complexes Chemistry ; Photocatalysis ; Photochemistry ; Environmental chemistry ; Inorganic chemistry ; Nuclear chemistry ; Organic chemistry ; Catalysis Oxidative Organic Chemistry Reactions ; Radical Photochemical Reactions ; Polyoxometalates: Synthesis and Applications
Authors: Byungjun Kim | Hooseung Lee | In‐Sun Song | Sarah Yunmi Lee
Source: Chemical Society Reviews (review, 2024-12-11)
Field: Chemistry — Organic Chemistry

Diastereodivergence in catalytic asymmetric conjugate addition of carbon nucleophiles Catalytic asymmetric conjugate additions of carbon nucleophiles have emerged as a potent tool for constructing multi-stereogenic molecules with precise stereochemical control. This review explores the concept of diastereodivergence in such reactions, focusing on strategies to achieve selective access to diverse diastereomeric products upon carbon-carbon bond formation. Drawing from a rich array of examples, we delve into key approaches for controlling the stereochemical outcome of these transformations, including alteration of alkene geometry, fine-tuning of reaction parameters, synergistic catalysis, and isomerization of conjugate adducts. Additionally, we highlight the iterative strategies for conjugate additions, showcasing their potential for diastereodivergent synthesis of methyl-branched stereocenters in 1,3-relationships. By presenting a concentrated overview of this significant topic, this review aims to provide valuable insights into the design and execution of stereodivergent catalytic conjugate additions, offering new avenues for advancing stereoselective synthesis and structural diversity in organic synthesis. Conjugate ; Nucleophile ; Catalysis ; Chemistry ; Carbon fibers ; Combinatorial chemistry ; Enantioselective synthesis ; Organic chemistry ; Materials science ; Mathematics Asymmetric Synthesis and Catalysis ; Chemical Synthesis and Analysis ; Asymmetric Hydrogenation and Catalysis
Authors: Jiajia Su | Chenchen Wu | Jiahui Zou | Xinqiuyue Wang | Kaiyun Yang | Jianping Liu | Zimei Wu | Wenli Zhang
Source: Journal of Controlled Release (article, 2024-06-14)
Field: Materials Science — Biomaterials

Fine-tuning of liposome integrity for differentiated transcytosis and enhanced antitumor efficacy Transcytosis ; Liposome ; Extravasation ; Chemistry ; Hypoxia (environmental) ; Pharmacology ; Cancer research ; Medicine ; Immunology ; Endocytosis ; Biochemistry ; Receptor Nanoparticle-Based Drug Delivery ; Cancer, Hypoxia, and Metabolism ; Nanoplatforms for cancer theranostics
Authors: Milind A. Patwardhan | Ritesh K. Jumale | Ritesh L. Kohale | Rujuta K. Joshi | Sarika A. Khapare
Source: Journal of Optics (article, 2024-03-23)
Field: Materials Science — Materials Chemistry

JO parameter analysis for Y2O3: Eu3+nanophophor synthesis by novel low temperature combustion method with thioglycerol as fuel for near UV light emitting diode Combustion ; Diode ; Optics ; Materials science ; Optoelectronics ; Light-emitting diode ; Physics ; Chemistry ; Organic chemistry Luminescence Properties of Advanced Materials ; Optical properties and cooling technologies in crystalline materials ; Catalytic Processes in Materials Science
Authors: Kaiqing Lu | Chen Chen | Jingliang Cheng | Ian E. Jacobs | Baiqiao Yue | Pochung Huang | Liang‐Wen Feng | Yue Lin
Source: ACS Materials Letters (article, 2024-08-21)
Field: Materials Science — Polymers and Plastics

Molecular Doping-Driven Modulation of Domain Charge Transport Elevates Thermoelectric Performance in Polar Polythiophene Unlocking outstanding thermoelectric performance in conjugated polymers (CPs) hinges on overcoming their intrinsically low charge mobility, resulting from their mixed crystalline–amorphous nature. Central to this challenge is to achieve synergistic intra- and interdomain charge transport in doped CPs. Taking polar polythiophene p(g32T-T) as a model system, we demonstrate that ion exchange doping synergistically improves charge transport across both ordered and disordered regions, establishing a power factor of 63 μW m–1 K–2, a considerable leap forward for polar polythiophenes. We highlight that excess doping induced a solid-state molecular reorientation from edge-on to face-on, initiating a decline in charge mobility within crystalline domains, despite improvements in interdomain charge transport. Furthermore, we showcase a quantitative methodology to probe interdomain transport efficiency, taking activation energy Wγ derived from weighted mobility as a key indicator. This study delineates a sophisticated framework for examining charge transport, underscoring the importance of fine-tuning both the amorphous and the crystalline regions. Polythiophene ; Doping ; Materials science ; Charge (physics) ; Amorphous solid ; Thermoelectric effect ; Charge carrier ; Seebeck coefficient ; Chemical physics ; Optoelectronics ; Nanotechnology ; Polymer ; Chemistry ; Conductive polymer ; Crystallography ; Physics ; Thermal conductivity Conducting polymers and applications ; Advanced Thermoelectric Materials and Devices ; Organic Electronics and Photovoltaics
Authors: Arisha Sharma | Prakash Biswas
Source: International Journal of Hydrogen Energy (article, 2024-06-21)
Field: Chemistry — Inorganic Chemistry

The utilization of metal-organic frameworks (MOFs) derived nickel-alumina catalyst for the production of hydrogen-rich syn-gas via methane tri-reforming: An innovative approach for attaining enhanced stability Catalysis ; Methane ; Nickel ; Hydrogen production ; Hydrogen ; Metal-organic framework ; Steam reforming ; Production (economics) ; Carbon dioxide reforming ; Methane reformer ; Chemical engineering ; Materials science ; Chemistry ; Syngas ; Metallurgy ; Organic chemistry Metal-Organic Frameworks: Synthesis and Applications ; Catalytic Processes in Materials Science ; Catalysts for Methane Reforming
Authors: Shanshan Yuan | Shengyu Li | Xiaoming Zhao | Yazhou Lin | Sheng‐Cai Zheng
Source: Journal of the American Chemical Society (article, 2024-11-27)
Field: Chemistry — Organic Chemistry

Enantioselective Alkylation of Primary C(<i>sp</i><sup>3</sup>)–H Bonds in <i>N</i>-Methyl Tertiary Amine Enabled by Iridium Complex of Axially Chiral β-Aryl Porphyrins A fine-tuning of enantioselective carbene insertion into primary C(<i>sp</i><sup>3</sup>)-H bonds has been realized in challenging substrates, such as <i>N</i>-methyl unblocked aromatic and non-deactivated aliphatic tertiary amines, in which sterically demanding β-axially chiral iridium porphyrin catalysts play a crucial role. This primary C(<i>sp</i><sup>3</sup>)-H alkylation with diazo compounds affords a series of β-chiral tertiary amines in high yields with excellent enantioselectivities. Notably, the protocol was successfully applied to the postmodification of chiral bicuculline, yielding the desired derivative with high diastereoselectivity. This approach paves a facile way for the stereodivergent derivation of chiral alkaloid natural products featuring an <i>N</i>-methyl handle. In addition, a mechanism for the reaction was proposed based on deuterium experiments and an identified cationic iridium species via HRMS analysis. Chemistry ; Enantioselective synthesis ; Iridium ; Tertiary amine ; Alkylation ; Aryl ; Amine gas treating ; Primary (astronomy) ; Medicinal chemistry ; Stereochemistry ; Organic chemistry ; Catalysis ; Alkyl Cyclopropane Reaction Mechanisms ; Porphyrin and Phthalocyanine Chemistry ; Metal-Catalyzed Oxygenation Mechanisms
Authors: Xuemin Luo | Yanhui Jiao | Hang Li | Qi Liu | Jinfeng Liu | Mingwei Wang | Yong Liu
Source: Materials (article, 2024-05-07)
Field: Materials Science — Materials Chemistry

Impact of Carrier Gas Flow Rate on the Synthesis of Monolayer WSe2 via Hydrogen-Assisted Chemical Vapor Deposition Transition metal dichalcogenides (TMDs), particularly monolayer TMDs with direct bandgap properties, are key to advancing optoelectronic device technology. WSe<sub>2</sub> stands out due to its adjustable carrier transport, making it a prime candidate for optoelectronic applications. This study explores monolayer WSe<sub>2</sub> synthesis via H<sub>2</sub>-assisted CVD, focusing on how carrier gas flow rate affects WSe<sub>2</sub> quality. A comprehensive characterization of monolayer WSe<sub>2</sub> was conducted using OM (optical microscope), Raman spectroscopy, PL spectroscopy, AFM, SEM, XPS, HRTEM, and XRD. It was found that H<sub>2</sub> incorporation and flow rate critically influence WSe<sub>2</sub>'s growth and structural integrity, with low flow rates favoring precursor concentration for product formation and high rates causing disintegration of existing structures. This research accentuates the significance of fine-tuning the carrier gas flow rate for optimizing monolayer WSe<sub>2</sub> synthesis, offering insights for fabricating monolayer TMDs like WS<sub>2</sub>, MoSe<sub>2</sub>, and MoS<sub>2</sub>, and facilitating their broader integration into optoelectronic devices. Monolayer ; X-ray photoelectron spectroscopy ; Raman spectroscopy ; Chemical vapor deposition ; High-resolution transmission electron microscopy ; Materials science ; Nanotechnology ; Volumetric flow rate ; Chemical engineering ; Optoelectronics ; Transmission electron microscopy ; Optics 2D Materials and Applications ; MXene and MAX Phase Materials ; Graphene research and applications
Authors: Max T. Birch | Fehmi Sami Yasin | Kai Litzius | Lukas Powalla | Sebastian Wintz | Frank Schulz | Alexander E. Kossak | Markus Weigand | Tanja Scholz | Bettina V. Lotsch | Gisela Schütz | Xiuzhen Yu | Marko Burghard
Source: ACS Nano (article, 2024-07-08)
Field: Materials Science — Materials Chemistry

Influence of Magnetic Sublattice Ordering on Skyrmion Bubble Stability in 2D Magnet Fe<sub>5</sub>GeTe<sub>2</sub> The realization of above room-temperature ferromagnetism in the two-dimensional (2D) magnet Fe<sub>5</sub>GeTe<sub>2</sub> represents a major advance for the use of van der Waals (vdW) materials in practical spintronic applications. In particular, observations of magnetic skyrmions and related states within exfoliated flakes of this material provide a pathway to the fine-tuning of topological spin textures via 2D material heterostructure engineering. However, there are conflicting reports as to the nature of the magnetic structures in Fe<sub>5</sub>GeTe<sub>2</sub>. The matter is further complicated by the study of two types of Fe<sub>5</sub>GeTe<sub>2</sub> crystals with markedly different structural and magnetic properties, distinguished by their specific fabrication procedure: whether they are slowly cooled or rapidly quenched from the growth temperature. In this work, we combine X-ray and electron microscopy to observe the formation of magnetic stripe domains, skyrmion-like type-I, and topologically trivial type-II bubbles, within exfoliated flakes of Fe<sub>5</sub>GeTe<sub>2</sub>. The results reveal the influence of the magnetic ordering of the Fe1 sublattice below 150 K, which dramatically alters the magnetocrystalline anisotropy and leads to a complex magnetic phase diagram and a sudden change of the stability of the magnetic textures. In addition, we highlight the significant differences in the magnetic structures intrinsic to slow-cooled and quenched Fe<sub>5</sub>GeTe<sub>2</sub> flakes. Skyrmion ; Magnet ; Bubble ; Condensed matter physics ; Materials science ; Stability (learning theory) ; Physics ; Mechanics ; Computer science 2D Materials and Applications ; Magnetic properties of thin films ; Magnetic and transport properties of perovskites and related materials
Authors: Alex J. Salazar‐Medina | Rosa Elena Navarro | Hisila Santacruz‐Ortega | Ángel Ulises Orozco-Valencia | R.I. López-Esquivel | Yedith Soberanes | Ch J. Salas-Juárez
Source: Optical and Quantum Electronics (article, 2024-05-10)
Field: Materials Science — Materials Chemistry

Luminescence properties of Eu3+ complexes based on macrocyclic ligands and its colorimetric analysis for white warm phosphor Phosphor ; Luminescence ; White light ; White (mutation) ; Materials science ; Photochemistry ; Chemistry ; Optoelectronics Lanthanide and Transition Metal Complexes ; Luminescence Properties of Advanced Materials ; Magnetism in coordination complexes
Authors: Alaauldeen A. Duhduh | Ali A. Rajhi
Source: Journal of Alloys and Compounds (article, 2024-09-24)
Field: Materials Science — Electronic, Optical and Magnetic Materials

3D framework MXene Ti3C2/g-C3N4/Fe3Si magneto-dielectric foam unveiling superior microwave absorption and thermal management performance Materials science ; Microwave ; Magneto ; Dielectric ; Absorption (acoustics) ; Thermal ; Nanotechnology ; Optoelectronics ; Composite material ; Chemistry ; Computer science ; Telecommunications ; Physics Electromagnetic wave absorption materials ; Advanced Antenna and Metasurface Technologies ; Metamaterials and Metasurfaces Applications
Authors: Maosheng Zuo | Honglei Yu | Dexi Wang | Lihua Fan
Source: Chemical Engineering and Processing - Process Intensification (article, 2024-10-09)
Field: Materials Science — Materials Chemistry

Jet cavitation-enhanced hydration method for the preparation of magnesium hydroxide Magnesium ; Cavitation ; Hydroxide ; Jet (fluid) ; Materials science ; Metallurgy ; Chemistry ; Inorganic chemistry ; Engineering ; Mechanics ; Aerospace engineering ; Physics Magnesium Oxide Properties and Applications ; Hydrogen Storage and Materials
Authors: Chun-Liang Lai | Riya Karmakar | Yu-Ming Tsao | Song-Cun Lu | Arvind Mukundan | P. Liu | Hsiang‐Chen Wang
Source: Optical Materials Express (article, 2024-07-09)
Field: Materials Science — Materials Chemistry

Fabrication of MoS<sub>2</sub> nanoparticle dispersions using ultrasonic methods: synthesis techniques and optical characterization This study outlines the process of preparing a dispersion of MoS 2 nanoparticle from micron sized MoS 2 powder using ultrasonic methods. The optical characteristics of this dispersion were investigated using optical measurement techniques. N-methyl-2-pyrrolidone is chosen as the dispersion solvent due to its surface energy closely matching that of MoS 2 . Consequently, the dispersion that ensued exhibits commendable stability. The MoS 2 dispersion underwent analysis through EDX, scanning electron microscopy, and transmission electron microscopy techniques to examine the correlation between the size of the MoS 2 nanoparticles and the morphology of the dispersion. The dispersion color intensifies with the increase in the wavelength. A He-Cd laser with a wavelength of 325 nm was used to stimulate and generate the matching light source for the generated samples to leverage the photoluminescent attribute of MoS 2 nanoparticles within the range of less than 100 nm. In the Raman measurement graph, distinct peaks can be observed in the generated nanoparticles, providing evidence of their material qualities. The surface morphology of the optical microscopic image was assessed using ultra-spectral imaging technology, allowing for the measurement and acquisition of the associated wavelength spectrum. The particle size in the dispersion was measured using the dynamic light scattering technique. These tests demonstrate that the process can be fine-tuned by adjusting parameters, such as ultrasonic oscillation time and centrifugal time. This process can also yield MoS 2 nanoparticle dispersions in various sizes, each exhibiting distinct photoluminescence characteristics corresponding to the excited light wavelength. Materials science ; Photoluminescence ; Dispersion (optics) ; Scanning electron microscope ; Nanoparticle ; Wavelength ; Dynamic light scattering ; Optics ; Transmission electron microscopy ; Optoelectronics ; Nanotechnology ; Composite material 2D Materials and Applications ; Chalcogenide Semiconductor Thin Films ; Quantum Dots Synthesis And Properties
Authors: Yu-Xiu Zhang | Nan Li | Jianru Li | Miao Fan | Qiqi Zhang | Fuquan Dang
Source: Microchimica Acta (article, 2024-03-19)
Field: Chemistry — Spectroscopy

Bifunctional MNPs@UIO-66-Arg core-shell-satellite nanocomposites for enrichment of phosphopeptides Bifunctional ; Nanocomposite ; Shell (structure) ; Satellite ; Core (optical fiber) ; Chemistry ; Chemical engineering ; Materials science ; Nanotechnology ; Organic chemistry ; Composite material ; Catalysis ; Physics ; Engineering Advanced Proteomics Techniques and Applications ; Advanced biosensing and bioanalysis techniques ; Protease and Inhibitor Mechanisms
Authors: Ning Xu | Qinghua Zhang | Shaoqi Zhan | Rui Li | Tingting Zhang | Kongzhao Su | Daqiang Yuan
Source: Separation and Purification Technology (article, 2024-11-12)
Field: Materials Science — Materials Chemistry

Boosting C2H2/CO2 separation by porous organic cages through the amino-functionalization of cavities Surface modification ; Porosity ; Boosting (machine learning) ; Chemical engineering ; Materials science ; Separation (statistics) ; Chemistry ; Organic chemistry ; Nanotechnology ; Engineering ; Computer science ; Artificial intelligence Covalent Organic Framework Applications ; Supramolecular Chemistry and Complexes ; Metal-Organic Frameworks: Synthesis and Applications
Authors: Jin Hyuk Cho | Young Ho Kim | Hak Ki Yu | Soo Young Kim
Source: Energy Materials (article, 2024-02-19)
Field: Materials Science — Materials Chemistry

Advancements in two-dimensional covalent organic framework nanosheets for electrocatalytic energy conversion: current and future prospects Humanity is confronting significant environmental issues due to rising energy demands and the unchecked use of fossil fuels. Thus, the strategic employment of sustainable and environmentally friendly energy sources is becoming increasingly vital. Additionally, addressing challenges, such as low reactivity, suboptimal energy efficiency, and restricted selectivity, requires the development of innovative catalysts. Two-dimensional (2D) covalent organic frameworks (COFs), known for their limitless structural versatility, are proving to be important materials in energy conversion applications. The exceptional properties of 2D COFs, including an organized arrangement resulting in well-defined active sites and π-π stacking interactions, enable breakthroughs in sustainable energy conversion applications. In this study, we comprehensively investigate universal synthesis methods and specific techniques, such as membrane-based deposition, liquid-phase intercalation, and polymerization. Furthermore, we demonstrate energy-conversion applications of 2D COFs as eco-friendly catalysts for electrochemical processes to promote sustainability and scalability by utilizing them in the hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, and carbon dioxide reduction reaction. Additionally, we will explore methods for analyzing the physicochemical properties of precisely fabricated 2D COFs. Despite extensive research pertaining to 2D COFs, their practical industrial applications remain limited. Therefore, we propose various perspectives, including enhancing performance, improving synthesis methods, developing binder-free catalysts, expanding catalyst functionality, and advancing full-cell research, to achieve complete industrialization by leveraging their potential. Current (fluid) ; Covalent bond ; Nanotechnology ; Electrocatalyst ; Energy transformation ; Materials science ; Chemistry ; Electrode ; Engineering ; Electrochemistry ; Physics ; Organic chemistry ; Electrical engineering Covalent Organic Framework Applications ; Advanced Photocatalysis Techniques ; Electrocatalysts for Energy Conversion