jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: P. Gangopadhyay
Source: ChemPhysChem (review, 2024-06-24)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Photoluminescence Quenching Upon Growth of Metal Nanoparticles: Quantum‐Mechanical Views In dictating the optical processes in metal nanoparticles, for instance, quantum nature of free electrons is significantly dominant and plays very crucial roles at the level of nanoscale dimensions of materials. As consequences of the quantum-confinement effects on the conduction electrons, surface-plasmon resonance induced optical absorption and light emission properties of metal nanoparticles are found to be strongly dependent on physical dimensions of the nanomaterials. In addition, surface-confined acoustic vibration (phonon) modes have been experimentally observed to depend on the sizes of the metal nanoparticles. Also, interestingly, tuning of the surface-plasmon resonance condition is found to enhance the intensity of the acoustic Raman modes in metal nanoparticles. The study highlights the role of plasmon-phonon coupling in Co metal nanoparticles embedded in a silica-glass. In the research field of nanosciences and nanotechnologies, extraordinary behaviour and properties of nanoscale matters are investigated. In this context, interesting studies have been discussed in this review article to elaborate optical, chemical and photoluminescence properties of nanoscale Ag metal particles. Subtle detection of optical phenomena associated with the excited many-body electronic processes in the metal nanoparticles, for example, are very interesting but definitely challenging. Here we make an attempt to find out how the thermal growth of Ag metal nanoparticles in a glass matrix snuffs out the light emission from the samples? Quantum mechanical interpretations of the underlying processes about the quenching of photoluminescence phenomena with the growth of the metal nanoparticles will help to fine tune the optical properties of plasmonic systems as well as to harness potential applications of the nanomaterials. Photoluminescence ; Nanoparticle ; Materials science ; Plasmon ; Surface plasmon resonance ; Nanotechnology ; Nanomaterials ; Quantum dot ; Chemical physics ; Quenching (fluorescence) ; Localized surface plasmon ; Surface plasmon ; Optoelectronics ; Chemistry ; Optics ; Physics ; Fluorescence Gold and Silver Nanoparticles Synthesis and Applications ; Plasmonic and Surface Plasmon Research ; Laser-Ablation Synthesis of Nanoparticles
Authors: Alexandros Kalampokidis | Eleftheria Klontza | Stergios Vakalis | Vincenzo Naddeo | Dimitrios Lekkas
Source: Circular Economy and Sustainability (review, 2024-10-11)
Field: Materials Science — Biomaterials

Is It Possible to Produce Polyhydroxyalkanoate (PHA) Bioplastics of Consistent Composition from Organic Wastes? A Review Bioplastic ; Polyhydroxyalkanoates ; Composition (language) ; Biochemical engineering ; Waste management ; Engineering ; Biology ; Philosophy ; Bacteria biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Additive Manufacturing and 3D Printing Technologies
Authors: Xiaojie Xu | Huachen Lin | Jinrui Ding | Pengjie Zhou | Yulong Ying | Hong Jia | Longhua Li | Yu Liu
Source: SSRN Electronic Journal (preprint, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

NiCoMn-LDH with Core-Shell Heterostructures Based on CoS Nanotube Arrays Containing Multiple Ion Diffusion Channels for Boosted Supercapacitor Applications Supercapacitor ; Heterojunction ; Nanotube ; Diffusion ; Shell (structure) ; Ion ; Nanotechnology ; Materials science ; Core (optical fiber) ; Optoelectronics ; Chemistry ; Physics ; Electrode ; Carbon nanotube ; Capacitance ; Physical chemistry ; Composite material ; Quantum mechanics Supercapacitor Materials and Fabrication ; Nanomaterials for catalytic reactions ; Catalytic Processes in Materials Science
Authors: Jilali Seffadi | H. Bahlouli | Ahmed Jellal
Source: Applied Physics A (article, 2024-10-17)
Field: Materials Science — Materials Chemistry

Controlling Goos–Hänchen shifts in phosphorene via barrier and well Phosphorene ; Condensed matter physics ; Chemistry ; Materials science ; Physics ; Band gap 2D Materials and Applications ; Graphene research and applications ; Molecular Junctions and Nanostructures
Authors: Rong Zheng | Huiling Lu | Pengjie Zhou | Yulong Ying | Longhua Li | Yu Liu
Source: SSRN Electronic Journal (preprint, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

In-Situ Construction of P-Doped Ni0.5cu0.5co2o4 with 1d/2d Hierarchical Nanostructure for High-Performance Hybrid Supercapacitors Supercapacitor ; Nanostructure ; In situ ; Materials science ; Doping ; Nanotechnology ; Optoelectronics ; Electrode ; Chemistry ; Capacitance Supercapacitor Materials and Fabrication ; Advancements in Battery Materials ; Electrocatalysts for Energy Conversion
Authors: Bagnawar Ashabai Maruti | Deshpande Poonam Suresh | Rajurkar Vikas
Source: International Journal of Advanced Research in Science Communication and Technology (article, 2024-08-09)
Field: Chemistry — Analytical Chemistry

Analytical Method Development and Validation of Alogliptin and Dapagliflozin in Tablet Dosage Form by RP HPLC The development and validation of a reverse-phase high-performance liquid chromatography (RP-HPLC) method for the simultaneous quantification of Alogliptin and Dapagliflozin in tablet dosage forms are presented in this study. Methanol was selected as the optimal solvent due to its superior solubility for both drugs. The wavelength for detection was set at 286 nm, as determined by the overlay PDA-spectrum, ensuring accurate quantification. The method was optimized using an HPLC C18 column (150 mm × 4.6 mm, 2.5 µm particle size) with a mobile phase comprising acetonitrile and 0.05% ortho phosphoric acid (80:20 % v/v), adjusted to pH 6.5 with 0.1% triethylamine. The chromatographic conditions were fine-tuned to achieve excellent resolution and symmetrical peak shapes for both drugs, with retention times of 5.690 ± 0.02 min for Alogliptin and 3.044 ± 0.022 min for Dapagliflozin. The method was validated as per ICH guidelines, demonstrating linearity, accuracy, precision, sensitivity, robustness, and specificity. Linearity was confirmed for Alogliptin (5–25 μg/mL) and Dapagliflozin (40–200 μg/mL) with correlation coefficients (r²) of 0.9999 and 0.9996, respectively. The method exhibited satisfactory accuracy with recovery rates within 99-101% and precision with %RSD less than 2%. Sensitivity analysis revealed limits of detection (LOD) and quantification (LOQ) appropriate for routine analysis. The method was successfully applied to the analysis of both bulk samples and marketed tablet formulations, proving its utility for quality control and routine analytical purposes in the pharmaceutical industry Alogliptin ; Dosage form ; Chromatography ; Dapagliflozin ; Chemistry ; Pharmacology ; Medicine ; Internal medicine Analytical Methods in Pharmaceuticals ; Diabetes Treatment and Management ; Drug Transport and Resistance Mechanisms
Authors: Juan Zhang | Zhihua Wang | Xingen Lin | Xiaoping Gao | Qiuping Wang | Rui Huang | Yaner Ruan | Haonan Xu | Lin Tian | Ling Chen | Ran Shi | Suowen Xu | Kong Y. Chen | Yuen Wu
Source: Angewandte Chemie (article, 2024-09-27)
Field: Materials Science — Materials Chemistry

Mn−Ce Symbiosis: Nanozymes with Multiple Active Sites Facilitate Scavenging of Reactive Oxygen Species (ROS) Based on Electron Transfer and Confinement Anchoring Abstract Regulating appropriate valence states of metal active centers, such as Ce 3+ /Ce 4+ and Mn 3+ /Mn 2+ , as well as surface vacancy defects, is crucial for enhancing the catalytic activity of cerium‐based and manganese‐based nanozymes. Drawing inspiration from the efficient substance exchange in rhizobia‐colonized root cells of legumes, we developed a symbiosis nanozyme system with rhizobia‐like CeO x nanoclusters robustly anchored onto root‐like Mn 3 O 4 nanosupports (CeO x /Mn 3 O 4 ). The process of “substance exchange” between Ce and Mn atoms—reminiscent of electron transfer—not only fine‐tunes the metal active sites to achieve optimal Ce 3+ /Ce 4+ and Mn 3+ /Mn 2+ ratios but also enhances the vacancy ratio through interface defect engineering. Additionally, the confinement anchoring of CeO x on Mn 3 O 4 ensures efficient electron transfer in catalytic reactions. The final CeO x /Mn 3 O 4 nanozyme demonstrates potent catalase‐like (CAT‐like) and superoxide dismutase‐like (SOD‐like) activities, excelling in both chemical settings and cellular environments with high reactive oxygen species (ROS) levels. This research not only unveils a novel material adept at effectively eliminating ROS but also presents an innovative approach for amplifying the efficacy of nanozymes. Reactive oxygen species ; Electron transfer ; Scavenging ; Chemistry ; Anchoring ; Oxygen ; Nanotechnology ; Photochemistry ; Materials science ; Biochemistry ; Organic chemistry ; Antioxidant Advanced Nanomaterials in Catalysis ; Electrochemical Analysis and Applications ; Electrocatalysts for Energy Conversion
Authors: Konthoujam James Singh | Yichia Lin | Zheng‐Zhe Chen | Chiao‐Yun Chang | Yuwei Zhang | Shih‐Yen Lin | Der‐Hsien Lien | Hao‐Chung Kuo | Min‐Hsiung Shih
Source: Advanced Materials Technologies (article, 2024-12-09)
Field: Materials Science — Materials Chemistry

Electrical Control of Electroluminescence in 2D Semiconductor Light Emitting Device through Synchronous Injection of Electrons and Holes Abstract Achieving efficient electroluminescence (EL) in 2D materials requires precise control over the injection and recombination of charge carriers—electrons and holes. In this study, a method is introduced to improve charge carrier injection in using transition metal dichalcogenides (TMDCs) based light emitting devices driven by alternating current (AC), achieved through dual pulse injection. The dual pulse device exhibits a notable enhancement in EL intensity, displaying a substantial increase as compared to the single pulse device, achieving an approximate sixfold improvement. The proposed dual pulse operated device configuration enables the independent control of electron and hole injection, facilitating the fine‐tuning of carrier recombination processes to improve the EL emission efficiency. Phase delay dependent EL characteristics are observed featuring a maximum integrated EL at a phase delay of 180° indicating an enhanced EL emission during out‐of‐phase pulse operation between the electrodes. Moreover, the dual pulse device exhibited a ≈3.5‐fold improvement in the device EL external efficiency (η e ) when compared to the device operated with a single pulse. Manipulating carrier recombination in TMDCs‐based LEDs opens up new opportunities to enhance their performance, enabling practical applications in display technology, lighting, optical communication, and electrically tunable light sources. Electroluminescence ; Optoelectronics ; Materials science ; Charge carrier ; Light-emitting diode ; Electron ; Pulse (music) ; Semiconductor ; Voltage ; Physics ; Nanotechnology 2D Materials and Applications ; Perovskite Materials and Applications ; ZnO doping and properties
Authors: Ying Xue | Xianyuan Liu | Xu Cui | Yang Zhao | Xianyong Lu
Source: Nano Research (article, 2024-06-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Precise magnetic tailoring in ZrO <sub>2</sub>/Fe <sub>3</sub>O <sub>4</sub>-Fe/C nanocomposites via electron transfer modulation for enhanced electromagnetic wave absorption Achieving precise control over the magnetic properties of composite materials for specific applications, while simultaneously optimizing their magnetic, dielectric, and electrical characteristics, remains a formidable challenge in material science. This study addresses this challenge by systematically modulating the magnetic and electrical properties of ZrO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Fe/C nanocomposites through controlled variations in the Zr/Fe ratio and leveraging electron transfer-induced effects. First-principles calculations reveal that reducing the Zr/Fe ratio decreases ZrO<sub>2</sub> content, thereby limiting the transfer of unpaired electrons to ZrO<sub>2</sub>. This limitation leads to the accumulation of localized electrons, significantly enhancing the magnetic moments from 136.29 to 165.76 μB. The fine-tuning of the Zr/Fe ratio enables precise electron transfer control, unlocking synergistic optimization of magnetic, dielectric, and electrical properties. Notably, the 4-ZrO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Fe/C-700 composite demonstrated exceptional electromagnetic wave absorption performance, achieving a minimum reflection loss (RLmin) of −67.76 dB and an effective absorption bandwidth (EAB) of 6.11 GHz with a thickness of only 2.4 mm. These results not only highlight a breakthrough in tailoring magnetic properties via electron transfer but also advance the understanding of the intricate interplay between magnetic regulation mechanisms and functional properties. This study provides a robust foundation for the development of next-generation magnetic materials with multifunctional applications, which has great application potential in the field of stealth technology. Nanocomposite ; Materials science ; Absorption (acoustics) ; Electron ; Electron transfer ; Modulation (music) ; Condensed matter physics ; Nanotechnology ; Physical chemistry ; Physics ; Chemistry ; Composite material ; Nuclear physics ; Acoustics Electromagnetic wave absorption materials ; Magnetic Properties and Synthesis of Ferrites
Authors: Μαρία Ψαρρού | Maria Vamvakaki | K. Karatasos | Anastassia N. Rissanou
Source: Colloids and Surfaces B Biointerfaces (article, 2024-11-20)
Field: Chemistry — Organic Chemistry

Interfacial interactions between DNA and polysaccharide-coated magnetic nanoparticles: Insight from simulations and experiments Polysaccharide ; Magnetic nanoparticles ; Nanoparticle ; Nanotechnology ; DNA ; Materials science ; Chemistry ; Chemical engineering ; Chemical physics ; Polymer science ; Organic chemistry ; Engineering Surfactants and Colloidal Systems ; Characterization and Applications of Magnetic Nanoparticles ; Nanoparticle-Based Drug Delivery
Authors: Nian‐Tao Yao | Qiang Liu | Jun-Wei Ma | Xiu‐Mei Du | Jing Ru | Jiao-Jiao Jiang | Liang Zhao | Yin‐Shan Meng
Source: Chemical Communications (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Manipulating Fe(<scp>ii</scp>) spin states to achieve higher anti-tumor cell activities in multinuclear complexes Exploring the different spin states of central metals in the complex to regulate the anti-tumor activity of cancer cells is of great significance in drug design and clinical use. However, it is a challenge to build a strong coupling between spin states and anti-tumor activities in one system. Herein, we present two complexes {Fe<sup>II</sup><sub>2</sub>L<sub>2</sub>[Pd<sup>II</sup>(CN)<sub>4</sub>]<sub>2</sub>}·2H<sub>2</sub>O (L = Bztpen (1), Bztppn (2); Bztpen = <i>N</i>-benzyl-<i>N</i>,<i>N</i>',<i>N</i>'-tris(2-pyridylmethyl)ethylenediamine, Bztppn = <i>N</i>-benzyl-<i>N</i>,<i>N</i>',<i>N</i>'-tris(2-pyridylmethyl)propylenediamine) showing different cytotoxic activities actuated by fine-tuning the structure with different spin states of Fe(II). Magnetic susceptibility measurements and X-ray diffraction revealed that the Fe(II) ion in complexes 1 and 2 remains in the LS and HS state, respectively, at room temperature. Cytotoxicity tests indicate that complex 1 is more biologically effective than complex 2. In complex 2, however, the high-spin Fe(II) played a key role in regulating its <i>in vitro</i> antitumor effects and seems to be associated with ROS-mediated apoptosis. These findings offer a new avenue for developing anti-cancer drugs by designing complexes with different spin states. Spin (aerodynamics) ; Chemistry ; Crystallography ; Combinatorial chemistry ; Materials science ; Physics Magnetism in coordination complexes ; Electron Spin Resonance Studies ; Metal complexes synthesis and properties
Authors: Vesna Lazić | Jovan M. Nedeljković
Source: Preprints.org (preprint, 2024-10-11)
Field: Chemistry — Organic Chemistry

Photocatalytic Reactions over TiO&lt;sub&gt;2&lt;/sub&gt;-Based Interfacial Charge Transfer Complexes The present review is related to the novel approach for improvement of the optical properties of wide bandgap metal oxides, in particular TiO2, based on the formation of the inorganic-organic hybrids that display absorption in the visible spectral range due to the formation of interfacial charge transfer (ICT) complexes. We outlined the property requirements of TiO2-based ICT complexes for efficient photo-induced catalytic reactions, emphasizing the simplicity of the synthetic procedure, the possibility of the fine-tuning of the optical properties supported by the density functional theory (DFT) calculations, and the formation of a covalent linkage between inorganic and organic components of hybrids, i.e., the nature of the interface. In addition, this study provides a comprehensive insight into potential applications of TiO2-based ICT complexes in photo-driven catalytic reactions (water splitting and degradation of organic molecules), including the identification of reactive species that participate in photocatalytic reactions by the spin-trapping electron paramagnetic resonance (EPR) technique. Considering the practically limitless number of combinations between inorganic and organic components capable of forming oxide-based ICT complexes and with the knowledge that this research area is unexplored, we are confident it is worth studying, and we emphasized some further perspectives. Photocatalysis ; Charge (physics) ; Materials science ; Transfer (computing) ; Chemical engineering ; Chemistry ; Photochemistry ; Catalysis ; Physics ; Computer science ; Engineering ; Organic chemistry ; Quantum mechanics Oxidative Organic Chemistry Reactions ; Polyoxometalates: Synthesis and Applications ; Nanomaterials for catalytic reactions
Authors: Sara Marijan | Marta Razum | Kristina Sklepić Kerhač | Petr Mošner | Ladislav Koudelka | Jana Pisk | Andrea Moguš‐Milanković | Željko Skoko | Luka Pavić
Source: Materials (article, 2024-01-07)
Field: Materials Science — Ceramics and Composites

The Crystallization Behavior of a Na2O-GeO2-P2O5 Glass System: A (Micro)Structural, Electrical, and Dielectric Study Sodium-phosphate-based glass-ceramics (GCs) are promising materials for a wide range of applications, including solid-state sodium-ion batteries, microelectronic packaging substrates, and humidity sensors. This study investigated the impact of 24 h heat-treatments (HT) at varying temperatures on Na-Ge-P glass, with a focus on (micro)structural, electrical, and dielectric properties of prepared GCs. Various techniques such as powder X-ray diffraction (PXRD), infrared spectroscopy-attenuated total reflection (IR-ATR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) were employed. With the elevation of HT temperature, crystallinity progressively rose; at 450 °C, the microstructure retained amorphous traits featuring nanometric grains, whereas at 550 °C, HT resulted in fully crystallized structures characterized by square-shaped micron-scale grains of NaPO<sub>3</sub>. The insight into the evaluation of electrical and dielectric properties was provided by Solid-State Impedance Spectroscopy (SS-IS), revealing a strong correlation with the conditions of controlled crystallization and observed (micro)structure. Compared to the initial glass, which showed DC conductivity (<i>σ</i><sub>DC</sub>) on the order of magnitude 10<sup>-7</sup> Ω<sup>-1</sup> cm<sup>-1</sup> at 393 K, the obtained GCs exhibited a lower <i>σ</i><sub>DC</sub> ranging from 10<sup>-8</sup> to 10<sup>-10</sup> Ω<sup>-1</sup> cm<sup>-1</sup>. With the rise in HT temperature, <i>σ</i><sub>DC</sub> further decreased due to the crystallization of the NaPO<sub>3</sub> phase, depleting the glass matrix of mobile Na<sup>+</sup> ions. The prepared GCs showed improved dielectric parameters in comparison to the initial glass, with a noticeable increase in dielectric constant values (~20) followed by a decline in dielectric loss (~10<sup>-3</sup>) values as the HT temperatures rise. Particularly, the GC obtained at @450 stood out as the optimal sample, showcasing an elevated dielectric constant and low dielectric loss value, along with moderate ionic conductivity. This research uncovers the intricate relationship between heat-treatment conditions and material properties, emphasizing that controlled crystallization allows for precise modifications to microstructure and phase composition within the remaining glassy phase, ultimately facilitating the fine-tuning of material properties. Crystallization ; Dielectric ; Materials science ; Composite material ; Chemical engineering ; Engineering physics ; Optoelectronics ; Engineering Glass properties and applications ; Solid-state spectroscopy and crystallography ; Luminescence Properties of Advanced Materials
Authors: Liliya Vugmeyster | Dmitry Ostrovsky | Riqiang Fu
Source: Solid State Nuclear Magnetic Resonance (article, 2024-02-22)
Field: Chemistry — Spectroscopy

Carbon-detected deuterium solid-state NMR rotating frame relaxation measurements for protein methyl groups under magic angle spinning Magic angle spinning ; Deuterium ; Spinning ; Solid-state nuclear magnetic resonance ; Deuterium NMR ; Magic angle ; Chemistry ; Analytical Chemistry (journal) ; Solid-state ; Carbon fibers ; Relaxation (psychology) ; Nuclear magnetic resonance ; Materials science ; Nuclear magnetic resonance spectroscopy ; Atomic physics ; Physics ; Physical chemistry ; Organic chemistry ; Polymer chemistry ; Composite material Advanced NMR Techniques and Applications ; Muon and positron interactions and applications ; NMR spectroscopy and applications
Authors: Kıvanç Sağlık | Xian Yi Tan | Jinfeng Dong | Ady Suwardi | Xi Zu Wang | Jianwei Xu | Qiang Zhu | Hongfei Liu | Jing Cao | Qingyu Yan
Source: Physical Chemistry Chemical Physics (article, 2024-12-09)
Field: Materials Science — Materials Chemistry

Improved thermoelectric efficiency of Sb<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> through yttrium-induced nanocompositing Sb<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> is a promising 2D material for medium-temperature thermoelectric applications, with the thermoelectric figure of merit <i>zT</i> approaching 1 at 823 K. However, its widespread use has been limited by relatively low power factor values. In this study, we successfully enhanced the performance of Sb<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> by introducing Yttrium nanocomposites. This modification fine-tuned the carrier concentration and electrical conductivity, and increased the power factor up to 946 μW K<sup>-1</sup> at 570 K. Jonker plot analysis revealed that increased carrier concentration did not affect the intrinsic electronic properties. SEM and TEM analyses revealed that Y nano-compositing introduced secondary phases, reducing the lattice thermal conductivity to values close to simulated ones using the Debye-Callaway model. Sb<sub>1.98</sub>Y<sub>0.02</sub>Si<sub>2</sub>Te<sub>6</sub> exhibited the highest <i>zT</i> of 1.49 at 773 K due to the ultralow lattice thermal conductivity of 0.29 W m<sup>-1</sup> K<sup>-1</sup> and a moderate power factor of 858 μW K<sup>-1</sup> at the same temperature. The single parabolic band (SPB) model suggests that with further optimization of the Fermi level and additional reduction in lattice thermal conductivity, the <i>zT</i> value could potentially increase to 1.55. These results demonstrate the potential of Y nanocompositing for enhancing Sb<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> as an efficient medium-temperature thermoelectric material. Thermoelectric effect ; Yttrium ; Materials science ; Antimony ; Thermoelectric materials ; Metallurgy ; Analytical Chemistry (journal) ; Chemistry ; Physics ; Thermodynamics ; Oxide Advanced Thermoelectric Materials and Devices ; Optical properties and cooling technologies in crystalline materials ; Phase-change materials and chalcogenides