jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Geonhui Lee | Seong‐Beom Han | Soo Hyun Kim | Sangmoo Jeong | Dong‐Hwee Kim
Source: Frontiers in Cell and Developmental Biology (article, 2024-01-25)
Field: Materials Science — Biomaterials

Stretching of porous poly (l-lactide-co-ε-caprolactone) membranes regulates the differentiation of mesenchymal stem cells <b>Background:</b> Among a variety of biomaterials supporting cell growth for therapeutic applications, poly (l-lactide-co-ε-caprolactone) (PLCL) has been considered as one of the most attractive scaffolds for tissue engineering owing to its superior mechanical strength, biocompatibility, and processibility. Although extensive studies have been conducted on the relationship between the microstructure of polymeric materials and their mechanical properties, the use of the fine-tuned morphology and mechanical strength of PLCL membranes in stem cell differentiation has not yet been studied. <b>Methods:</b> PLCL membranes were crystallized in a combination of diverse solvent-nonsolvent mixtures, including methanol (MeOH), isopropanol (IPA), chloroform (CF), and distilled water (DW), with different solvent polarities. A PLCL membrane with high mechanical strength induced by limited pore formation was placed in a custom bioreactor mimicking the reproducible physiological microenvironment of the vascular system to promote the differentiation of mesenchymal stem cells (MSCs) into smooth muscle cells (SMCs). <b>Results:</b> We developed a simple, cost-effective method for fabricating porosity-controlled PLCL membranes based on the crystallization of copolymer chains in a combination of solvents and non-solvents. We confirmed that an increase in the ratio of the non-solvent increased the chain aggregation of PLCL by slow evaporation, leading to improved mechanical properties of the PLCL membrane. Furthermore, we demonstrated that the cyclic stretching of PLCL membranes induced MSC differentiation into SMCs within 10 days of culture. <b>Conclusion:</b> The combination of solvent and non-solvent casting for PLCL solidification can be used to fabricate mechanically durable polymer membranes for use as mechanosensitive scaffolds for stem cell differentiation. Membrane ; Biocompatibility ; Caprolactone ; Chemical engineering ; Solvent ; Mesenchymal stem cell ; Materials science ; Distilled water ; Tissue engineering ; Crystallization ; Chemistry ; Polymer chemistry ; Copolymer ; Polymer ; Biomedical engineering ; Composite material ; Organic chemistry ; Chromatography ; Biochemistry ; Cell biology biodegradable polymer synthesis and properties ; Electrospun Nanofibers in Biomedical Applications ; Bone Tissue Engineering Materials
Authors: Andjelika Bjelajac | Adrian-Marie Phillipe | J. Guillot | Jean‐Baptiste Chemin | Patrick Choquet | Simon Bulou
Source: RSC Advances (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Iron oxide/graphene oxide nanocomposite synthesis using atmospheric cold plasma Herein, we demonstrate the use of an atmospheric pressure plasma with a Dielectric Barrier Discharge (DBD) for the synthesis of FeO<sub><i>x</i></sub> nanoparticles with a simultaneous formation of graphene oxide domains at low substrate temperature. For that, the interaction of the plasma to control good decomposition of the Fe precursor is essential and this is demonstrated by FTIR analyses. Thanks to a fine tuning of the plasma conditions, a homogeneous spatial distribution around 5 nm nanoparticles (NPs) was obtained, whereas without plasma, in the same configuration of the process, a heterogeneity regarding size and shape for the NPs was obtained. The Raman spectrum of the plasma deposit confirmed the presence of graphene oxide as the characteristic G and D bands were observed with <i>I</i>(D)/<i>I</i>(G) = 0.92. Thanks to optical emission spectroscopy (OES) measurements, it is proposed that the carbon deposition on FeO<sub><i>x</i></sub> nanoparticles is produced on the near plasma post discharge. XPS studies showed that the main contribution of iron was in Fe<sup>2+</sup> form, corresponding to the FeO phase. No metallic Fe or carbide were detected. As there are many studies reporting the synergetic effect of FeO<sub><i>x</i></sub> NPs and graphene oxide, we believe that this new one-step simultaneous synthesis method may be of high interest for applications requiring direct deposition on temperature labile substrates such as polymers. Graphene ; Nanocomposite ; Atmospheric-pressure plasma ; Oxide ; Atmospheric pressure ; Plasma ; Nanoparticle ; Chemical engineering ; Materials science ; Inorganic chemistry ; Nanotechnology ; Chemistry ; Metallurgy ; Meteorology Graphene research and applications ; Graphene and Nanomaterials Applications ; Diamond and Carbon-based Materials Research
Authors: Fábio Régis de Souza | E.L.T. França | J.M. Soares | A. S. Carvalho | Rodolfo Bezerra da Silva | L.K.C.S. Assis | D. M. Oliveira | J. E. Abrão | R. Peña‐Garcia | E. Padrón‐Hernández
Source: Journal of Superconductivity and Novel Magnetism (article, 2024-04-19)
Field: Materials Science — Materials Chemistry

Influence of the Sintering Temperature of Y3Fe4.97La0.03O12 Nanoparticles on the Resulting Structural and Magnetic Properties Materials science ; Sintering ; Nanoparticle ; Condensed matter physics ; Magnetic nanoparticles ; Engineering physics ; Nanotechnology ; Composite material ; Physics Magnetic Properties and Synthesis of Ferrites ; Magneto-Optical Properties and Applications ; Magnetic Properties of Alloys
Authors: Daniel Dornellas Athayde | Giovana Magalhães dos Santos | Anna Carolina Britto de Faria | Camila de Lima Ribeiro | Carlos Martins Aiube | Daniel Augusto Alves Ladislau | Edson Paulo da Silva | Luiz Fernando de Sousa Lima | Rodrigo Nunes de Souza | S. Silva | Nelcy Della Santina Mohallem | Alysson Martins Almeida Silva
Source: Microporous and Mesoporous Materials (article, 2024-11-20)
Field: Chemistry — Inorganic Chemistry

Investigation of the reaction time and hydrothermal synthesis route on the SSZ-13 zeolite particle crystallization and CO2 adsorption Zeolite ; Crystallization ; Hydrothermal circulation ; Hydrothermal synthesis ; Adsorption ; Chemical engineering ; Particle (ecology) ; Materials science ; Particle size ; Chemistry ; Inorganic chemistry ; Catalysis ; Physical chemistry ; Organic chemistry ; Geology Zeolite Catalysis and Synthesis ; Catalytic Processes in Materials Science ; Catalysts for Methane Reforming
Authors: Pengxiang Zhang | Feng Dang | Xin Zhang | Ce‐Wen Nan | Bao‐Wen Li
Source: Small (article, 2024-07-11)
Field: Materials Science — Materials Chemistry

Fully Printed Multilayer Ceramic Capacitors Based on High‐<i>k</i> Perovskite Nanosheets Printing technology enables the integration of chemically exfoliated perovskite nanosheets into high-performance microcapacitors. Theoretically, the capacitance value can be further enhanced by designing and constructing multilayer structures without increasing the device size. Yet, issues such as interlayer penetration in multilayer heterojunctions constructed using inkjet printing technology further limit the realization of this potential. Herein, a series of multilayer configurations, including Ag/(Ca<sub>2</sub>NaNb<sub>4</sub>O<sub>13</sub>/Ag)<sub>n</sub> and graphene/(Ca<sub>2</sub>NaNb<sub>4</sub>O<sub>13</sub>/graphene)<sub>n</sub> (n = 1-3), are successfully inkjet-printed onto diverse rigid and flexible substrates through optimized ink formulations, inkjet printing parameters, thermal treatment conditions, and rational multilayer structural design using high-k perovskite nanosheets, graphene nanosheets and silver. The dielectric performance is optimized by fine-tuning the number of dielectric layers and modifying the electrode/dielectric interface. As a result, the graphene/(Ca<sub>2</sub>NaNb<sub>4</sub>O<sub>13</sub>/graphene)<sub>3</sub> multilayer ceramic capacitors exhibit a remarkable capacitance density of 346 ± 12 nF cm<sup>-2</sup> and a high dielectric constant of 193 ± 18. Additionally, these devices demonstrate moderate insulation properties, flexibility, thermal stability, and chemical sensitivity. This work shed light on the potential of multilayer structural design in additive manufacturing of high-performance 2D material-based ceramic capacitors. Materials science ; Graphene ; Dielectric ; Capacitor ; Capacitance ; Ceramic ; Thermal stability ; Perovskite (structure) ; Nanotechnology ; Optoelectronics ; Electrode ; Composite material ; Chemical engineering ; Electrical engineering ; Voltage Dielectric properties of ceramics ; Ferroelectric and Piezoelectric Materials ; Dielectric materials and actuators
Authors: Maryam Khosravian | E. Bascones | José L. Lado
Source: 2D Materials (article, 2024-04-05)
Field: Materials Science — Materials Chemistry

Moiré-enabled topological superconductivity in twisted bilayer graphene Abstract Twisted van der Waals materials have risen as highly tunable platforms for realizing unconventional superconductivity. Here we demonstrate how a topological superconducting state can be driven in a twisted graphene multilayer at a twist angle of approximately 1.6 degrees proximitized to other 2D materials. We show that an encapsulated twisted bilayer subject to induced Rashba spin–orbit coupling, s-wave superconductivity, and exchange field generates a topological superconducting state enabled by the moiré pattern. We demonstrate the emergence of a variety of topological states with different Chern numbers, that are highly tunable through doping, strain, and bias voltage. Our proposal does not depend on fine-tuning the twist angle, but solely on the emergence of moiré minibands and is applicable for twist angles between 1.3 and 3 degrees. Our results establish the potential of twisted graphene bilayers to create topological superconductivity without requiring ultraflat dispersions. Superconductivity ; Bilayer graphene ; Graphene ; Condensed matter physics ; Topology (electrical circuits) ; van der Waals force ; Topological insulator ; Materials science ; Physics ; Nanotechnology ; Quantum mechanics Graphene research and applications ; Topological Materials and Phenomena ; 2D Materials and Applications
Authors: Gareth S. Parkinson
Source: Surface Science (article, 2024-12-20)
Field: Materials Science — Materials Chemistry

“Single-atom” catalysis: An opportunity for surface science • Exploring surface science’s role in advancing single-atom catalysis, focusing on breakthroughs in stability and mechanisms. • Highlighting synergy between surface science and computation, stressing the need for benchmarking to validate SAC predictions. • Focusing on advanced surface science techniques, I highlight pathways to optimize SAC activity on oxides, nitrides, and MOFs. Over the past decade, extensive research into ``single-atom'' catalysts (SACs) has revealed that the catalytic behavior of metal adatoms is highly dependent on how they interact with their support. A strong dependence on the local coordination environment has led to comparisons with metal-organic complexes, and there is growing excitement about the potential to fine-tune SACs by controlling the adsorption geometry. The rise of computational screening to identify the optimal support/metal combinations underscores the need for rigorous benchmarking of theoretical methods, to validate realistic geometries, mechanisms, and the impact of adsorption on stability and catalytic activity. The surface science approach is particularly well-suited for this task because it allows to precisely determine the geometry of the metal atom and interpret its catalytic behavior. Moreover, the effects of temperature and molecular adsorption on the model catalysts stability can be studied in isolation, and conclusions drawn from UHV studies tested in increasingly common near-ambient pressure and electrochemical setups. This perspective highlights recent breakthroughs and specific systems—including metal oxides, metal-organic frameworks, and carbon nitrides—where insights from surface science experiments can significantly advance understanding in this rapidly evolving field. Catalysis ; Surface (topology) ; Atom (system on chip) ; Nanotechnology ; Chemistry ; Materials science ; Engineering physics ; Chemical physics ; Physics ; Engineering ; Organic chemistry ; Geometry ; Mathematics Catalytic Processes in Materials Science ; Advanced Photocatalysis Techniques ; Electrocatalysts for Energy Conversion
Authors: Tarciane da Silva Pinto | Arthur Hegermann Ferreira | Nestor Cifuentes Taborda | João Paulo de Mesquita | Érico Tadeu Fraga Freitas | Sthéfany Zaida Silva do Amparo | E.A. Soares | Cláudio Luis Donnici | Everton Luiz de Paula | Fabiano Vargas Pereira
Source: Optical Materials (article, 2024-08-19)
Field: Materials Science — Materials Chemistry

Structure-property relationship between different molecular precursors and the final properties of carbon dots: Preparation, characterization and applications as sensors for metal ions Characterization (materials science) ; Carbon fibers ; Metal ions in aqueous solution ; Nanotechnology ; Metal ; Ion ; Materials science ; Property (philosophy) ; Chemical engineering ; Inorganic chemistry ; Chemistry ; Organic chemistry ; Metallurgy ; Engineering ; Composite material Carbon and Quantum Dots Applications ; Nanocluster Synthesis and Applications ; Luminescence and Fluorescent Materials
Authors: Padariya Mrugesh | Jyotiranjan Mishra | P.S. Subramanian | Sanjay Pratihar
Source: Chemistry - A European Journal (article, 2024-10-04)
Field: Chemistry — Organic Chemistry

Synergistic Nanoscale Mn<sub>3</sub>O<sub>4</sub>‐CoO‐Co Heterojunctions for Boosting the Selectivity in Hydrogenation of Nitrostyrenes and Nitroarenes Metal-metal oxide interface catalysts are in high demand for advanced catalytic applications due to their multi-component active sites, which facilitate synergistic cooperation where a single component alone cannot effectively promote the desired reaction. Demonstrated herein graphene oxide-supported nanoscale Mn<sub>3</sub>O<sub>4</sub>-CoO-Co as highly efficient catalysts for hydrogenation of nitro styrenes/nitro arenes to amino styrenes/arenes under mild reaction conditions (0.5 MPa and 100 °C in 1 : 1 THF/water). Charge relocalization at the Co-CoO-Mn<sub>3</sub>O<sub>4</sub> heterojunction interfaces, primarily driven by Mn<sub>3</sub>O<sub>4</sub>, significantly improves reaction selectivity. Replacing Mn<sub>3</sub>O<sub>4</sub> with MnO or using other supported bimetallic CoMnO<sub>x</sub> catalysts decreases selectivity, leading to the formation of a mixture of products. The catalyst demonstrated remarkable selectivity in converting nitro groups to amines, even in the presence of highly reactive functional groups such as C=C, O-C=O, C=O, C≡N, chalcones, and halides. It also exhibited high yields, multiple reusability, and a broad substrate scope. This study demonstrates how Mn<sub>3</sub>O<sub>4</sub>, in synergy with CoO-Co, fine-tunes selectivity, paving the way for the development of advanced metal-metal oxide interface catalysts to enhance both selectivity and efficiency in organic transformations. Selectivity ; Catalysis ; Bimetallic strip ; Oxide ; Chemistry ; Nitro ; Metal ; Inorganic chemistry ; Combinatorial chemistry ; Materials science ; Chemical engineering ; Organic chemistry ; Alkyl Nanomaterials for catalytic reactions ; Copper-based nanomaterials and applications
Authors: Xuwen Sun | Muyu Cong | Xin Jin | Jianhua Su | Zhiyun Zhang
Source: The Journal of Physical Chemistry C (article, 2024-08-28)
Field: Chemistry — Physical and Theoretical Chemistry

Engineering of Charge-Transfer State to Modify Photophysical Properties in <i>N</i>,<i>N</i>′-Diaryl-dihydrodibenzo[<i>a</i>,<i>c</i>]phenazine Herein, we explored the charge transfer (CT) effect on the excited-state structural and electronic evolution of N,N′-diphenyl-dihydrodibenzo[a,c]phenazine (DPAC) featuring various electron-donating groups (EDGs). Upon photoexcitation, DPAC molecules undergo a sequential multistep structural transformation along the Franck–Condon (FC) state, CT-controlled bent state (responsible for E1─420 nm), and twisted state (responsible for E2─600 nm). By introducing different EDGs to the DPAC core, we can fine-tune the balance between the inherent decay of the CT-controlled bent state and its progression into the twisted state by adjusting the CT effect. As the electron-donating ability of the EDG increases, the strong CT effect can produce a “deep” (stable) CT-controlled bent state, in which the transformation of the excited molecular skeleton from bent into twisted was partly suppressed. This research provides valuable insights into organic chromophores’ excited-state structural and electronic evolution, revealing how competitive decay pathways are contingent upon the CT effect. Photoexcitation ; Bent molecular geometry ; Excited state ; Phenazine ; Chromophore ; Crystallography ; Electron transfer ; Molecule ; Chemical physics ; Ground state ; Photochemistry ; Materials science ; Chemistry ; Atomic physics ; Physics ; Organic chemistry Photochemistry and Electron Transfer Studies ; Luminescence and Fluorescent Materials ; Porphyrin and Phthalocyanine Chemistry
Authors: Santosh Tawari | Ujashkumar Shah
Source: Biomedical Chromatography (article, 2024-08-20)
Field: Chemistry — Analytical Chemistry

Addressing stability issues of vildagliptin: Method optimization and validation for accurate analysis in human plasma This research paper introduces novel strategies to address the stability issues arising with vildagliptin, marking the first attempt to tackle this challenge comprehensively. The study incorporates malic acid into the human plasma, a crucial step in stabilizing vildagliptin and preventing its degradation. Additionally, optimization of the elution process on a C18 Asentis Express column, fine-tuned with a combination of acetonitrile and ammonium trifluoroacetate 5mM, ensures optimal chromatographic conditions. For detection and quantification, electrospray ionization (ESI) is employed, monitoring multiple reactions for vildagliptin (304.2 → 154.2) and vildagliptin D7 (311.1 → 161.2). Meticulous validation of the method demonstrates high accuracy (97.30%-104.15%) and precision [(0.32%-3.09% coefficient of variance (CV)] for vildagliptin calibration curve standards (CC STD), establishing its sensitivity and reliability in measuring vildagliptin levels. This refined methodology offers numerous advantages, including the elimination of stability concerns, reduced human plasma sample volume (100 μL), exceptional reproducibility, shortened run time (~2.2 min), and a wide concentration range (1.00 to 851.81 ng/mL). These attributes make it exceptionally well-suited for diverse research applications, spanning from extensive sampling in therapeutic drug monitoring units to bioequivalence and bioavailability studies, as well as pharmacokinetic investigations of vildagliptin. Vildagliptin ; Chromatography ; Chemistry ; Analyte ; Reproducibility ; Bioavailability ; Human plasma ; Pharmacology ; Biotechnology Analytical Methods in Pharmaceuticals ; Antibiotics Pharmacokinetics and Efficacy ; Pharmacogenetics and Drug Metabolism
Authors: Gyanendra Singh | Roger Guzmán | Guilhem Saïz | Wu Zhou | Jaume Gàzquez | Fereshteh Masoudinia | D. Winkler | T. Claeson | Jordi Fraxedas | N. Bergeal | G. Herranz | Alexei Kalaboukhov
Source: Communications Physics (article, 2024-05-09)
Field: Materials Science — Materials Chemistry

Stoichiometric control of electron mobility and 2D superconductivity at LaAlO3-SrTiO3 interfaces Abstract SrTiO 3 -based conducting interfaces, which exhibit coexistence of gate-tunable 2D superconductivity and strong Rashba spin-orbit coupling (RSOC), are candidates to host topological superconductive phases. Yet, superconductivity is usually in the dirty limit, which tends to suppress nonconventional pairing and therefore challenges these expectations. Here we report on LaAlO 3 /SrTiO 3 (LAO/STO) interfaces with large mobility and mean free paths comparable to the superconducting coherence length, approaching the clean limit for superconductivity. We further show that the carrier density, mobility, and formation of the superconducting condensate are controlled by the fine-tuning of La/Al chemical ratio in the LAO film. We find a region in the superconducting phase diagram where the critical temperature is not suppressed below the Lifshitz transition, at odds with previous experimental investigations. These findings point out the relevance of achieving a clean-limit regime to enhance the observation of unconventional pairing mechanisms in these systems. Superconductivity ; Stoichiometry ; Condensed matter physics ; Electron ; Materials science ; Physics ; Chemistry ; Physical chemistry ; Nuclear physics Electronic and Structural Properties of Oxides ; Magnetic and transport properties of perovskites and related materials ; Semiconductor materials and devices
Authors: Dongdong Lin | Massimo Bagnani | Hamed Almohammadi | Ye Yuan | Yufen Zhao | Raffaele Mezzenga
Source: Advanced Materials (article, 2024-05-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Single‐Step Control of Liquid–Liquid Crystalline Phase Separation by Depletion Gradients Fine-tuning nucleation and growth of colloidal liquid crystalline (LC) droplets, also known as tactoids, is highly desirable in both fundamental science and technological applications. However, the tactoid structure results from the trade-off between thermodynamics and nonequilibrium kinetics effects, and controlling liquid-liquid crystalline phase separation (LLCPS) in these systems is still a work in progress. Here, a single-step strategy is introduced to obtain a rich palette of morphologies for tactoids formed via nucleation and growth within an initially isotropic phase exposed to a gradient of depletants. The simultaneous appearance is shown of rich LC structures along the depleting potential gradient, where the position of each LC structure is correlated with the magnitude of the depleting potential. Changing the size (nanoparticles) or the nature (polymers) of the depleting agent provides additional, precise control over the resulting LC structures through a size-selective mechanism, where the depletant may be found both within and outside the LC droplets. The use of depletion gradients from depletants of varying sizes and nature offers a powerful toolbox for manipulation, templating, imaging, and understanding heterogeneous colloidal LC structures. Materials science ; Separation (statistics) ; Phase (matter) ; Liquid phase ; Chemical engineering ; Chromatography ; Thermodynamics ; Organic chemistry Liquid Crystal Research Advancements ; Surfactants and Colloidal Systems ; Crystallization and Solubility Studies
Authors: Shuang Li | Boyu Cui | Xue Jia | Weihong Wang | Yutong Cui | Jiayan Ding | Yiqun Fang | Yongming Song | Xianquan Zhang
Source: Industrial Crops and Products (article, 2024-03-06)
Field: Materials Science — Biomaterials

A cellulose-based film with self-healing performance for light management Cellulose ; Self-healing ; Materials science ; Cellulosic ethanol ; Papermaking ; Ultimate tensile strength ; Composite number ; Ultraviolet light ; Chemical engineering ; Composite material ; Optoelectronics Advanced Cellulose Research Studies ; Lignin and Wood Chemistry ; Polymer composites and self-healing