jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Nikoleta F. Theodoroula | Christina Karavasili | Manos C. Vlasiou | Alexandra Primikyri | Christia Nicolaou | Alexandra V. Chatzikonstantinou | Aikaterini‐Theodora Chatzitaki | Christos Petrou | Nikolaos Bouropoulos | Constantinos K. Zacharis | Eleftheria Galatou | Yiannis Sarigiannis | Dimitrios G. Fatouros | Ioannis S. Vizirianakis
Source: Pharmaceutics (article, 2022-01-06)
Field: Materials Science — Biomaterials

NGIWY-Amide: A Bioinspired Ultrashort Self-Assembled Peptide Gelator for Local Drug Delivery Applications Fibrillar structures derived from plant or animal origin have long been a source of inspiration for the design of new biomaterials. The Asn-Gly-Ile-Trp-Tyr-NH<sub>2</sub> (NGIWY-amide) pentapeptide, isolated from the sea cucumber <i>Apostichopus japonicus</i>, which spontaneously self-assembles in water to form hydrogel, pertains to this category. In this study, we evaluated this ultra-short cosmetic bioinspired peptide as vector for local drug delivery applications. Combining nuclear magnetic resonance, circular dichroism, infrared spectroscopy, X-ray diffraction, and rheological studies, the synthesized pentapeptide formed a stiff hydrogel with a high β-sheet content. Molecular dynamic simulations aligned well with scanning electron and atomic-force microscopy studies, revealing a highly filamentous structure with the fibers adopting a helical-twisted morphology. Model dye localization within the supramolecular hydrogel provided insights on the preferential distribution of hydrophobic and hydrophilic compounds in the hydrogel network. That was further depicted in the diffusion kinetics of drugs differing in their aqueous solubility and molecular weight, namely, doxorubicin hydrochloride, curcumin, and octreotide acetate, highlighting its versatility as a delivery vector of both hydrophobic and hydrophilic compounds of different molecular weight. Along with the observed cytocompatibility of the hydrogel, the NGIWY-amide pentapeptide may offer new approaches for cell growth, drug delivery, and 3D bioprinting tissue-engineering applications. Pentapeptide repeat ; Drug delivery ; Chemistry ; Supramolecular chemistry ; Circular dichroism ; Amide ; Peptide ; Biophysics ; Combinatorial chemistry ; Nanotechnology ; Materials science ; Organic chemistry ; Stereochemistry ; Molecule ; Biochemistry Supramolecular Self-Assembly in Materials ; Silk-based biomaterials and applications ; Hydrogels: synthesis, properties, applications
Authors: Jiang Xinlin | Ren‐Cheng Tang
Source: International Journal of Molecular Sciences (article, 2022-11-29)
Field: Materials Science — Polymers and Plastics

Phosphorylation of Kapok Fiber with Phytic Acid for Enhanced Flame Retardancy Kapok fiber (KF), with the characteristics of a natural hollow structure, light weight, and low density, can be used as acoustic and thermal insulation, buoyancy, adsorption, filling, and composite material. The flame-retardant treatment can expand the functionality and application of KF. In this work, the phosphorylation of KF using phytic acid (PA) in the presence of urea at a high temperature was used to enhance its flame retardancy. The phosphorylation reaction conditions were discussed, and the surface topography, thermal degradation, heat release, and combustion properties of phosphorylated KF were studied. The Fourier transform infrared spectroscopy and <sup>31</sup>P solid-state nuclear magnetic resonance spectroscopy analyses confirmed the grafting of PA on cellulose by the formation of phosphate ester bonds. Due to the covalent binding of PA, phosphorylated KF exhibited good washing durability. The surface topography, Raman spectroscopy, thermogravimetric (TG), and microcalorimetry analyses revealed the excellent charring ability of phosphorylated KF. In the TG test in nitrogen, the char residue increased to 42.6% of phosphorylated KF from 8.3% of raw KF at 700 °C. In the vertical combustion, raw KF sheet was almost completely burned out within 30 s, while phosphorylated KF was very difficult to catch fire. In the microcalorimetry analysis, the heat release capacity and total heat release of phosphorylated KF decreased to 67 J/g∙K and 3.9 kJ/g, respectively from 237 J/g∙K and 18.1 kJ/g of raw KF. This work suggests that phosphorylated KF is an excellent flame-retardant material. Fire retardant ; Thermogravimetric analysis ; Materials science ; Char ; Fourier transform infrared spectroscopy ; Nuclear chemistry ; Phytic acid ; Chemical engineering ; Chemistry ; Combustion ; Organic chemistry ; Composite material ; Biochemistry Flame retardant materials and properties ; Natural Compound Pharmacology Studies
Authors: Joanna Palion‐Gazda | Agata Szłapa‐Kula | Mateusz Penkala | Karol Erfurt | B. Machura
Source: Molecules (article, 2022-10-22)
Field: Materials Science — Materials Chemistry

Photoinduced Processes in Rhenium(I) Terpyridine Complexes Bearing Remote Amine Groups: New Insights from Transient Absorption Spectroscopy Photophysical properties of two Re(I) complexes [ReCl(CO)<sub>3</sub>(R-C<sub>6</sub>H<sub>4</sub>-terpy-κ<sup>2</sup>N)] with remote amine groups, <i>N</i>-methyl-piperazinyl (<b>1</b>) and (2-cyanoethyl)methylamine (<b>2</b>), were investigated. The complexes show strong absorption in the visible region corresponding to metal-to-ligand charge transfer (<sup>1</sup>MLCT) and intraligand-charge-transfer (<sup>1</sup>ILCT) transitions. The energy levels of <sup>3</sup>MLCT and <sup>3</sup>ILCT excited-states, and thus photoluminescence properties of <b>1</b> and <b>2</b>, were found to be strongly affected by the solvent polarity. Compared to the parent chromophore [ReCl(CO)<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>-terpy-κ<sup>2</sup>N)] (<b>3</b>), both designed complexes show significantly prolonged (by 1-2 orders of magnitude) phosphorescence lifetimes in acetonitrile and dimethylformamide, contrary to their lifetimes in less polar chloroform and tetrahydrofuran, which are comparable to those for <b>3</b>. The femtosecond transient absorption (fsTA) measurements confirmed the interconversion between the <sup>3</sup>MLCT and <sup>3</sup>ILCT excited-states in polar solvents. In contrast, the emissive state of <b>1</b> and <b>2</b> in less polar environments is of predominant <sup>3</sup>MLCT nature. Photochemistry ; Ultrafast laser spectroscopy ; Excited state ; Phosphorescence ; Chemistry ; Rhenium ; Chromophore ; Methylamine ; Dimethylamine ; Acetonitrile ; Absorption spectroscopy ; Spectroscopy ; Absorption (acoustics) ; Tetrahydrofuran ; Solvent ; Materials science ; Fluorescence ; Inorganic chemistry ; Organic chemistry ; Atomic physics Porphyrin and Phthalocyanine Chemistry ; Organic Light-Emitting Diodes Research ; CO2 Reduction Techniques and Catalysts
Authors: Wanchun Ren | Jintong Li | Guo Liu | Jia‐Rong Chen | Si Chen | Zhijun Gu | Jian-Bo Li | Junru Li | Yang Gao
Source: Micromachines (article, 2022-01-28)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Design and Optimization of a BAW Magnetic Sensor Based on Magnetoelectric Coupling Magnetic sensors actuated by bulk acoustic wave (BAW) have attracted extensive attention due to the fact of their high sensitivity, GHz-level high frequency, and small size. Different from previous studies, suppression of energy loss and improvement in energy conversion efficiency of the BAW magnetoelectric (ME) sensor were systematically considered during the device design in this work. Finite element analysis models of material (magnetic composite), structure (ME heterostructure), and device (BAW ME magnetic sensor) were established and analyzed in COMSOL software. Additionally, the magnetic composite was prepared by radio frequency magnetron sputtering, and its soft magnetism was characterized by magnetic hysteresis loop and surface roughness. The research results demonstrate that after inserting four layers of 5 nm Al<sub>2</sub>O<sub>3</sub> films, a performance of 86.7% eddy current loss suppression rate, a less than 1.1% magnetostriction degradation rate, and better soft magnetism were achieved in 600 nm FeGaB. Furthermore, compared with other structures, the two-layer piezomagnetic/piezoelectric heterostructure had a better ME coupling performance. Eventually, the design of the BAW ME magnetic sensor was optimized by the resonance-enhanced ME coupling to match the resonance frequency between the magnetic composite and the BAW resonator. When a 54,500 A/m direct current bias magnetic field was applied, the sensor worked at the first-order resonance frequency and showed good performance. Its linearity was better than 1.30%, the sensitivity was as high as 2.33 μmV/A, and the measurement range covered 0-5000 A/m. Materials science ; Magnetostriction ; Magnetism ; Resonator ; Optoelectronics ; Sensitivity (control systems) ; Hysteresis ; Magnetic field ; Coupling (piping) ; Heterojunction ; Sputter deposition ; Linearity ; Magnet ; Eddy current ; Acoustics ; Nuclear magnetic resonance ; Sputtering ; Electronic engineering ; Electrical engineering ; Condensed matter physics ; Thin film ; Composite material ; Nanotechnology ; Engineering Multiferroics and related materials ; Acoustic Wave Resonator Technologies ; Magnetic and transport properties of perovskites and related materials
Authors: Weiwei Guo | Yinping Ma | Lei Hu | Yujie Feng | Yanmiao Liu | Xuedong Yi | Wenzhi Zhang | Fushan Tang
Source: Polymers (review, 2022-11-30)
Field: Materials Science — Biomaterials

Modification Strategies for Ionic Complementary Self-Assembling Peptides: Taking RADA16-I as an Example Ion-complementary self-assembling peptides have been studied in many fields for their distinct advantages, mainly due to their self-assembly properties. However, their shortcomings, such as insufficient specific activity and poor mechanical properties, also limited their application. For the better and wider application of these promising biomaterials, ion-complementary self-assembling peptides can be modified with their self-assembly properties not being destroyed to the greatest extent. The modification strategies were reviewed by taking RADA16-I as an example. For insufficient specific activity, RADA16-I can be structurally modified with active motifs derived from the active domain of the extracellular matrix or other related active factors. For weak mechanical properties, materials with strong mechanical properties or that can undergo chemical crosslinking were used to mix with RADA16-I to enhance the mechanical properties of RADA16-I. To improve the performance of RADA16-I as drug carriers, appropriate adjustment of the RADA16-I sequence and/or modification of the RADA16-I-related delivery system with polymer materials or specific molecules can be considered to achieve sustained and controlled release of specific drugs or active factors. The modification strategies reviewed in this paper may provide some references for further basic research and clinical application of ion-complementary self-assembling peptides and their derivatives. Self-assembly ; Materials science ; Nanotechnology ; Self-healing hydrogels ; Polymer chemistry Supramolecular Self-Assembly in Materials ; Polydiacetylene-based materials and applications ; Antimicrobial Peptides and Activities
Authors: Grant Seuser | Michela Martinelli | Elijah S. Garcia | Gabriel F. Upton | Martin Ayala | Jesus Villarreal | Zahra Rajabi | Donald C. Cronauer | A. Jeremy Kropf | Gary Jacobs
Source: Applied Catalysis A General (article, 2022-12-16)
Field: Materials Science — Materials Chemistry

Reverse water-gas shift: Na doping of m-ZrO2 supported Pt for selectivity control Water-gas shift reaction ; Formate ; Catalysis ; Selectivity ; Doping ; Inorganic chemistry ; Chemistry ; Syngas ; Adsorption ; Materials science ; Physical chemistry ; Organic chemistry Catalytic Processes in Materials Science ; Catalysts for Methane Reforming ; Ammonia Synthesis and Nitrogen Reduction
Authors: Micah Barker | Tommaso Nicolini | Yasmina Al Yaman | Damien Thuau | Olga Siscan | Sasikumar Ramachandran | Éric Cloutet | Cyril Brochon | Lee J. Richter | Olivier J. Dautel | Georges Hadziioannou | Natalie Stingelin
Source: Materials Horizons (article, 2022-11-14)
Field: Materials Science — Polymers and Plastics

Conjugated polymer blends for faster organic mixed conductors A model mixed-conducting polymer, blended with an amphiphilic block-copolymer, is shown to yield systems with drastically enhanced electro-chemical doping kinetics, leading to faster electrochemical transistors with a high transduction. Importantly, this approach is robust and reproducible, and should be readily adaptable to other mixed conductors without the need for exhaustive chemical modification. Conjugated system ; Materials science ; Electrical conductor ; Polymer ; Conductive polymer ; Chemical engineering ; Polymer chemistry ; Nanotechnology ; Composite material Conducting polymers and applications ; Organic Electronics and Photovoltaics ; Fuel Cells and Related Materials
Authors: L. E. Corrêa | Pedro P. Ferreira | Leandro R. de Faria | Thiago T. Dorini | M. S. da Luz | Z. Fisk | M. S. Torikachvili | Luiz T. F. Eleno | António Machado
Source: Journal of Alloys and Compounds (article, 2022-03-15)
Field: Chemistry — Inorganic Chemistry

Evidence for multiband superconductivity and charge density waves in Ni-doped ZrTe2 Superconductivity ; Condensed matter physics ; Charge density wave ; Doping ; Materials science ; Charge (physics) ; Physics ; Charge density ; Quantum mechanics Inorganic Chemistry and Materials ; 2D Materials and Applications ; Iron-based superconductors research
Authors: Isaac Choi | Michael J. Trenerry | Ken S. Lee | Nicholas King | John F. Berry | Jennifer M. Schomaker
Source: ChemSusChem (article, 2022-09-27)
Field: Chemistry — Organic Chemistry

Divergent C−H Amidations and Imidations by Tuning Electrochemical Reaction Potentials Electrochemical C-H functionalizations are attractive transformations, as they are capable of avoiding the use of transition metals, pre-oxidized precursors, or suprastoichiometric amounts of terminal oxidants. Herein an electrochemically tunable method was developed that enabled the divergent formation of cyclic amines or imines by applying different reaction potentials. Detailed cyclic voltammetry analyses, coupled with chronopotentiometry experiments, were carried out to provide insight into the mechanism, while atom economy was assessed through a paired electrolysis. Selective C-H amidations and imidations were achieved to afford five- to seven-membered sulfonamide motifs that could be employed for late-stage modifications. Electrochemistry ; Cyclic voltammetry ; Electrolysis ; Chemistry ; Reaction mechanism ; Sulfonamide ; Combinatorial chemistry ; Transition metal ; Nanotechnology ; Materials science ; Electrode ; Catalysis ; Organic chemistry ; Physical chemistry Catalytic C–H Functionalization Methods ; Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques
Authors: Alberto Blanch-Jover | Nicola De Franceschi | Daphna Fenel | Winfríed Weissenhorn | Cees Dekker
Source: FEBS Letters (article, 2022-03-03)
Field: Materials Science — Materials Chemistry

The archaeal division protein CdvB1 assembles into polymers that are depolymerized by CdvC The Cdv proteins constitute the cell division system of the Crenarchaea, a machinery closely related to the ESCRT system of eukaryotes. Using a combination of TEM imaging and biochemical assays, we here present an in vitro study of Metallosphaera sedula CdvB1, the Cdv protein that is believed to play a major role in the constricting ring that drives cell division in the Crenarchaea. We show that CdvB1 self-assembles into filaments that are depolymerized by the Vps4-homolog ATPase CdvC. Furthermore, we find that CdvB1 binds to negatively charged lipid membranes and can be detached from the membrane by the action of CdvC. Our findings provide novel insight into one of the main components of the archaeal cell division machinery. Cell division ; Chemistry ; Archaea ; ATPase ; Division (mathematics) ; Cell biology ; Membrane ; Biochemistry ; Lipid II ; Membrane protein ; ESCRT ; Biophysics ; Lipid bilayer ; Cell ; Biology ; Cell wall ; Enzyme ; Gene ; Vesicle Enzyme Structure and Function ; Genomics and Phylogenetic Studies ; Bacterial Genetics and Biotechnology
Authors: Somnath Koley | Jiabin Cui | Yossef E. Panfil | Yonatan Ossia | Adar Levi | Einav Scharf | Lior Verbitsky | Uri Banin
Source: Matter (article, 2022-08-26)
Field: Materials Science — Materials Chemistry

Photon correlations in colloidal quantum dot molecules controlled by the neck barrier Delocalized electron ; Photon ; Physics ; Molecular physics ; Quantum dot ; Molecule ; Atomic physics ; Ionic bonding ; Radiative transfer ; Electron ; Chemical physics ; Quantum mechanics Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; Molecular Junctions and Nanostructures
Authors: Xueqin Xu | Dawei Sha | Zhihua Tian | Fushuo Wu | Wei Zheng | Yang Li | Shengyu Xie | Peigen Zhang | ZhengMing Sun
Source: Nanoscale Horizons (article, 2022-12-21)
Field: Materials Science — Materials Chemistry

Lithium storage performance and mechanism of nano-sized Ti<sub>2</sub>InC MAX phase Fine powders of MAX phases (a family of layered carbides/nitrides) have been showing great promise in energy storage applications. A feasible method of obtaining nano-sized MAX phase particles is critical to realizing the practical application of the vast MAX phase family in more technologically important fields. Herein, ball milling, a commercial and feasible method, is employed to prepare nano-sized Ti<sub>2</sub>InC, which delivers a high specific capacity of 590 mA h g<sup>-1</sup> after 500 cycles and maintains 574.4 mA h g<sup>-1</sup> after 600 cycles at 0.1 A g<sup>-1</sup> when used as a lithium storage anode. Compared with other methods (<i>e.g.</i>, partial etching), decreasing the size of Ti<sub>2</sub>InC particles by ball milling can preserve the exfoliated indium (In) atoms, which have great volumetric and gravimetric capacities. <i>In situ</i> XRD analysis indicates that the capacity of the nano-sized Ti<sub>2</sub>InC primarily comes from the lithiation of elemental In exfoliated from Ti<sub>2</sub>InC, and in particular, the exfoliated In atoms by ball milling can increase the initial capacity. The lithiation/delithiation cycle can effectively activate and even exfoliate the Ti<sub>2</sub>InC grains, which accounts for the increasing capacity upon cycling. Nano- ; Materials science ; Phase (matter) ; Lithium (medication) ; Chemistry ; Composite material ; Psychology MXene and MAX Phase Materials ; Ferroelectric and Negative Capacitance Devices ; Advanced Memory and Neural Computing
Authors: Anqiang Deng | Yong‐Chun Luo | Jianfei Zhou | Yunding Xie | Yuan Yuan | Xiaoyan Kang | Bingjin Shen | Haimin Zhang
Source: Metals (article, 2022-06-30)
Field: Materials Science — Materials Chemistry

Effect of Mn Element on the Structures and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys The structures, hydrogen storage behaviors and electrochemical properties of Y0.75La0.25Ni3.5−xMnx (x = 0–0.3) alloys were analyzed by X-ray diffraction, Neutron powder diffraction, pressure–composition isotherms and electrochemical tests. All alloys have a multiphase structure. With the increase in Mn content, the Gd2Co7-type phase of the alloys gradually transforms into the Ce2Ni7-type phase; the Mn atom mainly occupies the Ni sites in the [AB5] subunit and the interface between the [AB5] and [A2B4] subunits; the V[A2B4]/V[AB5] continuously decreases from 1.045 (x = 0) to 1.019 (x = 0.3), which reduces the volume mismatch between [A2B4] and [AB5] subunits. The maximum hydrogen absorption of the series alloys increases first and then decreases, and the addition of Mn effectively promotes the hydrogen absorption/desorption performance of the alloys. The maximum discharge capacity of the alloy electrodes is closely related to their hydrogen storage capacity at 0.1 MPa and hydrogen absorption/desorption plateau pressure. The cyclic stability of all the Mn-containing alloy electrodes is improved clearly compared to that of Mn-free alloy electrodes, because the volume mismatch between the [AB5] and [A2B4] subunits of the alloys becomes smaller after the addition of Mn, which can improve the structural stability and reduce the corrosion of alloys during hydrogen absorption/desorption cycles. When the Mn content is between 0.1 and 0.15, the Ce2Ni7-type phase of the alloys has high abundance and the alloy electrodes exhibit excellent overall performance. Hydrogen storage ; Alloy ; Materials science ; Electrochemistry ; Desorption ; Hydrogen ; Analytical Chemistry (journal) ; Neutron diffraction ; Phase (matter) ; Absorption (acoustics) ; Electrode ; Chemical engineering ; Metallurgy ; Adsorption ; Crystallography ; Chemistry ; Composite material ; Crystal structure ; Physical chemistry Hydrogen Storage and Materials ; Ammonia Synthesis and Nitrogen Reduction ; Magnesium Alloys: Properties and Applications
Authors: Nkune Williams Nkune | Gauta Gold Matlou | Heidi Abrahamse
Source: Pharmaceutics (article, 2022-11-09)
Field: Materials Science — Materials Chemistry

Photodynamic Therapy Efficacy of Novel Zinc Phthalocyanine Tetra Sodium 2-Mercaptoacetate Combined with Cannabidiol on Metastatic Melanoma This work reports for the first time on the synthesis, characterization, and photodynamic therapy effect of a novel water-soluble zinc (II) 2(3), 9(10), 16(17), 23(24)-tetrakis-(sodium 2-mercaptoacetate) phthalocyanine (ZnPcTS41), on metastatic melanoma cells (A375) combined with cannabidiol (CBD). The ZnPcTS41 structure was confirmed using FTIR, NMR, MS, and elemental analysis while the electronic absorption spectrum was studied using UV-VIS. The study reports further on the dose-dependent effects of ZnPcTS41 (1-8 µM) and CBD alone (0.3-1.1 µM) at 636 nm with 10 J/cm<sup>2</sup> on cellular morphology and viability. The IC<sub>50</sub> concentrations of ZnPcTS41 and CBD were found to be 5.3 µM and 0.63 µM, respectively. The cytotoxicity effects of the ZnPcTS41 enhanced with CBD on A375 cells were assessed using MTT cell viability assay, ATP cellular proliferation and inverted light microscopy. Cell death induction was also determined via Annexin V-FITC-PI. The combination of CBD- and ZnPcTS41-mediated PDT resulted in a significant reduction in cell viability (15%***) and an increase in the late apoptotic cell population (25%*). These findings suggest that enhancing PDT with anticancer agents such as CBD could possibly obliterate cancer cells and inhibit tumor recurrence. Viability assay ; Chemistry ; Photodynamic therapy ; MTT assay ; Cytotoxicity ; Cannabidiol ; Phthalocyanine ; Annexin ; Apoptosis ; Zinc ; Melanoma ; Cell growth ; Cancer research ; Nuclear chemistry ; In vitro ; Medicine ; Biochemistry ; Organic chemistry Porphyrin and Phthalocyanine Chemistry ; Photodynamic Therapy Research Studies ; Nanoplatforms for cancer theranostics