jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Thu Anh Nguyen | Anh Nguyen Kim | Tien Nu Hoang Lo | In Park | Khương Quoc Võ
Source: RSC Advances (article, 2022-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Single-step controlled synthesis of flower-like gold nanoparticles stabilized by chitosan for sensitive detection of heparin using a surface-enhanced Raman scattering method A novel single-step and template-free procedure, including controlled synthesis of gold flowers (AuNFs), conjugation to a 4-MBA reporter, and stabilization with chitosan, is proposed to develop the SERS tags-based nanoparticles for trace detection of heparin. This SERS detection assay is based on the aggregation/non-aggregation balance of AuNFs-4-MBA@chitosan nanoparticles, which was induced by adding a very low concentration of heparin in the as-synthesized colloidal solutions. SERS-tag colloids are prepared by mixing chitosan with HAuCl<sub>4</sub> and 4-mercapto benzoic acid before being reduced with ascorbic acid under appropriate pH conditions. The formed AuNFs-4-MBA@chitosan nanoparticles were positively charged with high stability and well-dispersed in aqueous media. Based on understanding each reaction component's role in the preparation of the SERS tag colloid, we aim to simplify the controlled synthesis and Raman probe conjugation process. The average size of AuNFs is below 90 nm, fine-tuned in shape and effectively conjugated to the Raman reporter molecules 4-MBA. These as-prepared SERS tag-based AuNFs have good biocompatibility and are virtually non-toxic, as studied with fibroblast and MCF-7 cells. Through these SERS-tag colloids, the trace detection of heparin is improved, with a wide detection window (0.01 to 100 ppm), high reproducibility (RSD value of 3.56%), limit of detection (LOD) of 0.054 ppm, and limit of quantification (LOQ) of 0.17 ppm. Comparison experiments show that the SERS-tag colloids possess good selectivity over other ions, and organic and amino acid substances. The results provide the capability and the potential for application under complex biological conditions and future biosensing based on SERS signal amplification. Raman scattering ; Chitosan ; Colloidal gold ; Nanoparticle ; Materials science ; Heparin ; Raman spectroscopy ; Nanotechnology ; Surface (topology) ; Chemical engineering ; Chemistry ; Optics Gold and Silver Nanoparticles Synthesis and Applications ; Spectroscopy Techniques in Biomedical and Chemical Research ; Dendrimers and Hyperbranched Polymers
Authors: Martin Friák | Martin Zelený | Martina Mazalová | Ivana Miháliková | I. Turek | J. Kaštil | J. Kamarád | Martin Míšek | Z. Arnold | O. Schneeweiss | Mojmı́r Šob
Source: Intermetallics (article, 2022-09-13)
Field: Materials Science — Materials Chemistry

The impact of disorder on the 4O-martensite of Ni–Mn–Sn Heusler alloy Materials science ; Alloy ; Martensite ; Metallurgy ; Condensed matter physics ; Microstructure Shape Memory Alloy Transformations ; Heusler alloys: electronic and magnetic properties ; Advanced Thermoelectric Materials and Devices
Authors: Songlin Li | Jinchang Sun | Yu Zhang | Yuting Fan | Xinfeng Tang | Gangjian Tan
Source: Zeitschrift für anorganische und allgemeine Chemie (article, 2022-05-19)
Field: Materials Science — Materials Chemistry

Effect of Ag, Sb and Se co‐doping on the thermoelectric performance of SnS Abstract As an inexpensive and non‐toxic binary layered compound, SnS shows great potential in thermoelectric applications. In this work, we performed a systematical study on how minute co‐doping of Ag, Sb and Se in a mole ratio of 1 : 1 : 2 (namely AgSbSe 2 ) affects thermoelectric transport properties of p‐type SnS. It is found that AgSbSe 2 has a high solid solution limit (at least 4 mol %) in the matrix, and the band gap of SnS gets reduced upon Ag, Sb and Se co‐doping. The strong anharmonic chemical bonding and reinforced point defect scattering synergistically contribute to a low thermal conductivity of ∼0.88 W m −1 K −1 at room temperature for the sample Sn 0.92 Ag 0.04 Sb 0.04 S 0.92 Se 0.08 . An abnormal decrease of hole concentration in the co‐doped SnS is established, which is attributed to the generation of more Sn 4+ ions in the lattice. Fine tuning of Ag/Sb ratio might populate more charge carriers and yield higher thermoelectric performance. Thermoelectric effect ; Doping ; Materials science ; Analytical Chemistry (journal) ; Thermoelectric materials ; Band gap ; Scattering ; Seebeck coefficient ; Electrical resistivity and conductivity ; Anharmonicity ; Ion ; Solid solution ; Impurity ; Condensed matter physics ; Thermal conductivity ; Chemistry ; Optoelectronics ; Metallurgy ; Thermodynamics ; Optics ; Physics Advanced Thermoelectric Materials and Devices ; Chalcogenide Semiconductor Thin Films ; Quantum Dots Synthesis And Properties
Authors: Sumaira Anjum | Rimsha Chaudhary | Amna Komal Khan | Mariam Hashim | Iram Anjum | Christophe Hano | Bilal Haider Abbasi
Source: RSC Advances (article, 2022-01-01)
Field: Materials Science — Materials Chemistry

Light-emitting diode (LED)-directed green synthesis of silver nanoparticles and evaluation of their multifaceted clinical and biological activities The trend of using plant extracts for the synthesis of nanoparticles has increased in recent years due to environmental safety, low cost, simplicity and sustainability of the green route. Moreover, the morphology of NPs can be fine-tuned by applying abiotic factors such as LEDs, which enhance the bio-reduction of the precursor salt and excite phytochemicals during their green synthesis. Considering this, in present study, the green synthesis of AgNPs was carried out using <i>Dalbergia sissoo</i> leaf extract under the illumination of red, green, blue, yellow and white LEDs. The phytochemical profile of the leaf extract in terms of total phenolic and flavonoid content was responsible for the effective synthesis of AgNPs, where alcohols and phenols were mainly involved in the capping and bio-reduction of the NPs. Moreover, the XRD data showed the face center cubic crystalline nature of the AgNPs with the interesting finding that the LEDs helped to reduce the size of the AgNPs significantly. Among the samples, Y-DS-AgNPs (34.63 nm) were the smallest in size, with the control having a size of 87.35 nm. The LEDs not only reduced the size of the AgNPs but also resulted in the synthesis of non-agglomerated AgNPs with different shapes including spherical, triangular, and hexagonal compared to the mixed-shape control AgNPs, as shown by the SEM analysis. These LED-directed AgNPs showed extraordinary therapeutic potential especially B-DS-AgNPs, which exhibited the highest anti-oxidant, anti-glycation and anti-bacterial activities. Alternatively, Y-DS-AgNPs were the most cytotoxic towards HepG2 cells, inducing intracellular ROS/RNS production, accompanied by a disruption in the mitochondrial membrane potential, caspase-3 gene activation and induction of caspase-3/7 activity. Lastly, AgNPs showed mild toxicity towards brine shrimp and moderately hemolyzed hRBCs, showing their biosafe nature. Here, we conclude that external factors such as LEDs are effective in controlling the morphology of AgNPs, which further enhanced their therapeutic efficacy. Light-emitting diode ; Nanotechnology ; Green-light ; Silver nanoparticle ; Diode ; Nanoparticle ; Materials science ; Blue light ; Optoelectronics Nanoparticles: synthesis and applications ; Advanced Nanomaterials in Catalysis
Authors: Maura Cesaria | A. Serra | D. Manno | Muhammad Rizwan Aziz | Simona Rella | Cosimino Malitesta | M. Martino | P. Verwilligen | Anna Paola Caricato
Source: Diamond and Related Materials (article, 2022-02-09)
Field: Materials Science — Materials Chemistry

Tailoring sheet resistance through laser fluence and study of the critical impact of a V-shaped plasma plume on the properties of PLD-deposited DLC films for micro-pattern gaseous detector applications Materials science ; Kapton ; Fluence ; Substrate (aquarium) ; Pulsed laser deposition ; Sheet resistance ; Diamond-like carbon ; Thin film ; Optoelectronics ; Plume ; Fabrication ; Optics ; Composite material ; Nanotechnology ; Laser ; Polyimide Diamond and Carbon-based Materials Research ; Carbon Nanotubes in Composites ; Ion-surface interactions and analysis
Authors: Peilong Li | Arkaye Kierulf | Judith Whaley | James Smoot | Mariana Perez Herrera | Alireza Abbaspourrad
Source: ACS Applied Materials & Interfaces (article, 2022-08-12)
Field: Materials Science — Materials Chemistry

Modulating Functionality of Starch-Based Patchy Particles by Manipulating Architecture and Environmental Factors Starch as a food-grade thickener has been commonly used in food products to modulate textural properties. Improving viscosity-enhancing ability, so as to be able to use less starch for the same texture, has been considered as an approach to reduce the dietary consumption of carbohydrates. We have positively charged amaranth starch (∼1 μm) and negatively charged corn starch (>10 μm) and physically fused the particles together to create a starch with a heterogeneous pattern. This starch has a negatively charged main body, due to the larger corn particles, and positively charged patches from the amaranth starch. These patchy particles self-assembled through electrostatic interactions into a shear-reversible thickener. The impact of patchiness and charge density on material functionality was investigated. The degree of patchiness was controlled by manipulating the ratio between the two starches, and results showed that viscosity was reduced when the patchiness was higher. With the same patchy area, a higher charge density did not contribute to higher water-holding capacity. The more charged particles were able to enhance the viscosity, however, due to the stronger interparticle electrostatic interaction. The effects of environmental factors including pH level and ionic strength were also investigated, and the results showed that at extreme pH levels, or in the presence of Na<sup>+</sup> or Ca<sup>2+</sup>, the charges on the starch particles were screened, and this inhibited interaction and reduced viscosity. The present work demonstrates that the texture of starch slurries can be fine-tuned by manipulating the degree of patchiness and the charge density of patchy particles. It also evaluates the application potential in food products with different pH levels and ionic strengths. Starch ; Materials science ; Viscosity ; Chemical engineering ; Amaranth ; Electrostatics ; Charge density ; Static electricity ; Rheology ; Chemical physics ; Apparent viscosity ; Composite material ; Chemistry ; Food science Pickering emulsions and particle stabilization ; Proteins in Food Systems ; Polysaccharides Composition and Applications
Authors: Xuemin Chen | Yu Liu | Shuhua Yin | Jiachen Zang | Tuo Zhang | Chenyan Lv | Guanghua Zhao
Source: ACS Applied Materials & Interfaces (article, 2022-09-26)
Field: Materials Science — Biomaterials

Construction of Sol–Gel Phase-Reversible Hydrogels with Tunable Properties with Native Nanofibrous Protein as Building Blocks Reversible sol-gel transforming behaviors combined with tunable mechanical properties are vital demands for developing biomaterials. However, it remains challenging to correlate these properties with the hydrogels constructed by denatured protein as building blocks. Herein, taking advantage of naturally high-affinity coordination environments consisting of <i>i</i>, <i>i + 4</i> His-Glu motifs offered by paramyosin, a ubiquitous nanofibrous protein, we found that Zn<sup>2+</sup> rather than Ca<sup>2+</sup> or Mg<sup>2+</sup> has the ability to trigger the self-assembly of native abalone paramyosin (AbPM) into protein hydrogels under benign conditions, while the addition of EDTA induces the hydrogels back into protein monomers, indicative of a reversible process. By using such sol-gel reversible property, the AbPM gels can serve as a vehicle to encapsulate bioactive molecules such as curcumin, thereby protecting it from degradation from thermal and photo treatment. Notably, based on the high conserved structure of native AbPM, the mechanical property and biological activity of the fabricated AbPM hydrogels can be fined-tuned by its noncovalent interaction with small molecules. All these findings raise the possibility that native paramyosin can be explored as a new class of protein hydrogels which exhibit favorable properties that the traditional hydrogels constructed by denatured protein building blocks do not have. Self-healing hydrogels ; Materials science ; Monomer ; Chemical engineering ; Phase (matter) ; Molecule ; Nanotechnology ; Polymer ; Polymer chemistry ; Composite material ; Chemistry ; Organic chemistry Supramolecular Self-Assembly in Materials ; Silk-based biomaterials and applications ; Electrospun Nanofibers in Biomedical Applications
Authors: Debobroto Sensharma | Benjamin H. Wilson | Naveen Kumar | Daniel J. O’Hearn | Michael J. Zaworotko
Source: Crystal Growth & Design (article, 2022-08-19)
Field: Chemistry — Inorganic Chemistry

Pillar Modularity in <b>fsc</b> Topology Hybrid Ultramicroporous Materials Based upon Tetra(4-pyridyl)benzene Hybrid ultramicroporous materials (HUMs) are porous coordination networks composed of combinations of organic and inorganic linker ligands with a pore diameter of <7 Å. Despite their benchmark gas sorption selectivity for several industrially relevant gas separations and their inherent modularity, the structural and compositional diversity of HUMs remains underexplored. In this contribution, we report a family of six HUMs (<b>SIFSIX-22-Zn</b>, <b>TIFSIX-6-Zn</b>, <b>SNFSIX-2-Zn</b>, <b>GEFSIX-4-Zn</b>, <b>ZRFSIX-3-Zn</b>, and <b>TAFSEVEN-1-Zn</b>) based on Zn metal centers and the tetratopic N-donor organic ligand tetra(4-pyridyl)benzene (<b>tepb</b>). The incorporation of fluorinated inorganic pillars (SiF<sub>6</sub> <sup>2-</sup>, TiF<sub>6</sub> <sup>2-</sup>, SnF<sub>6</sub> <sup>2-</sup>, GeF<sub>6</sub> <sup>2-</sup>, ZrF<sub>6</sub> <sup>2-</sup>, and TaF<sub>7</sub> <sup>2-</sup>, respectively) resulted in (4,6)-connected <b>fsc</b> topology as verified using single-crystal X-ray diffraction. Pure-component gas sorption studies with N<sub>2</sub>, CO<sub>2</sub>, C<sub>2</sub>H<sub>2</sub>, C<sub>2</sub>H<sub>4</sub>, and C<sub>2</sub>H<sub>6</sub> revealed that the large voids and narrow pore windows common to all six HUMs can be leveraged to afford high C<sub>2</sub>H<sub>2</sub> uptakes while retaining high ideal adsorbed solution theory (IAST) selectivities for industrially relevant gas mixtures: >10 for 1:99 C<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub> and >5 for 1:1 C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub>. The approach taken, systematic variation of pillars with retention of structure, enables differences in selectivity to be attributed directly to the choice of the inorganic pillar. This study introduces <b>fsc</b> topology HUMs as a modular platform that is amenable to fine-tuning of structure and properties. Topology (electrical circuits) ; Sorption ; Benzene ; Selectivity ; Modularity (biology) ; Ligand (biochemistry) ; Metal-organic framework ; Porosity ; Chemistry ; Adsorption ; Tetra ; Linker ; Materials science ; Crystallography ; Chemical engineering ; Physical chemistry ; Organic chemistry ; Catalysis ; Computer science ; Medicinal chemistry Metal-Organic Frameworks: Synthesis and Applications ; Covalent Organic Framework Applications ; Mesoporous Materials and Catalysis
Authors: Andrey Shatskiy | Gregory R. Alvey | Markus D. Kärkäs
Source: Chem (article, 2022-01-01)
Field: Chemistry — Organic Chemistry

Chemodivergent difunctionalization of alkenes through base-controlled radical relay Trifluoromethylation ; Chemistry ; Lewis acids and bases ; Reactivity (psychology) ; Combinatorial chemistry ; Organic chemistry ; Photochemistry ; Catalysis ; Trifluoromethyl Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques ; Catalytic C–H Functionalization Methods
Authors: Chadha Mejri | Walid Oueslati | Abdesslem Ben Haj Amara
Source: Adsorption Science & Technology (article, 2022-01-01)
Field: Materials Science — Biomaterials

Structural Alteration, Hydration Stability, Heavy Metal Removal Efficiency, and Montmorillonite Porosity Fate by Coupling the Soil Solution pH and a Thermal Gradient Clay minerals are considered as a promising material in the context of geological barrier for the confinement of radioactive and industrial waste. Understanding the usefulness of the smectite mineral, in this approach, remains insufficient. The deep investigation about structural response/changes, hydrate stability, cation exchange process, permeability, and heavy metal/radionuclide adsorption/removal efficiency under external constraints is needed. To explore the structural alteration, the hydration stability, and the evolution of montmorillonite porosity under a first order of external applied constraints coupling, a reference Na-rich montmorillonite specimen is used as a starting material, and three exchangeable heavy metal cations (Ba 2+ , Cu 2+ , and Co 2+ ) have been selected. The applied constraint coupling is realized at laboratory scale and assured by simultaneously varying of the soil solution pH and the thermal gradient. The evaluation of the mineral fraction response is established by correlation of quantitative XRD analysis results, thermal analysis, and porosity measurements. The quantitative XRD analysis allows rebuilding of the theoretical model describing the interlamellar space (IS) configurations/damages, structural heterogeneity degrees, and hydrous stability. Obtained results show a dominant interstratified hydration character, for all studied complexes, attributed to a new IS organization versus the applied constraint strength. Furthermore, all samples exhibit a heterogeneous hydration behavior traduced by the coexistence of different layers of type population within the crystallite. Additionally, the theoretical XRD profile decomposition allowed us to prove link between the domination of the segregated stacking layers mode against the constraint strength. Thermal analysis allowed us to develop theoretical models describing the decrease of the water molecule amounts as a function of the increase in temperature and soil solution pH. Moreover, a specific hydration footprint response and an interstratification mapping are assigned for each corresponding stress degrees. The evolution of montmorillonite porosity is determined by adsorption measurement, based on Brunauer, Emmett, and Teller (BET) and Barrett-Joyner-Halenda (BJH) pore size distribution analyses which confirms for all samples, the exfoliation process, and the mesopore diameter rise by increasing the constraint intensity. Montmorillonite ; Chemistry ; Porosity ; Thermal stability ; Adsorption ; Clay minerals ; Context (archaeology) ; Crystallite ; Mineralogy ; Chemical engineering ; Physical chemistry ; Crystallography ; Geology Clay minerals and soil interactions ; Therapeutic Uses of Natural Elements ; Heavy metals in environment
Authors: Pooja Sharma | Guijun Wang
Source: Gels (article, 2022-03-19)
Field: Materials Science — Biomaterials

4,6-O-Phenylethylidene Acetal Protected D-Glucosamine Carbamate-Based Gelators and Their Applications for Multi-Component Gels The self-assembly of carbohydrate-based low molecular weight gelators has led to useful advanced soft materials. The interactions of the gelators with various cations and anions are important in creating novel molecular architectures and expanding the scope of the small molecular gelators. In this study, a series of thirteen new C-2 carbamates of the 4,6-<i>O</i>-phenylethylidene acetal-protected D-glucosamine derivatives has been synthesized and characterized. These compounds are rationally designed from a common sugar template. All carbamates synthesized were found to be efficient gelators and three compounds are also hydrogelators. The resulting gels were characterized using optical microscopy, atomic force microscopy, and rheology. The gelation mechanisms were further elucidated using <sup>1</sup>H NMR spectroscopy at different temperatures. The isopropyl carbamate hydrogelator <b>7</b> formed hydrogels at 0.2 wt% and also formed gels with several tetra alkyl ammonium salts, and showed effectiveness in the creation of gel electrolytes. The formation of metallogels using earth-abundant metal ions such as copper, nickel, iron, zinc, as well as silver and lead salts was evaluated for a few gelators. Using chemiluminescence spectroscopy, the metal-organic xerogels showed enzyme-like properties and enhanced luminescence for luminol. In addition, we also studied the applications of several gels for drug immobilizations and the gels showed sustained release of naproxen from the gel matrices. This robust sugar carbamate-derived gelator system can be used as the scaffold for the design of other functional materials with various types of applications. Component (thermodynamics) ; Acetal ; Carbamate ; Glucosamine ; Chemistry ; Combinatorial chemistry ; Organic chemistry ; Chemical engineering ; Physics ; Engineering Supramolecular Self-Assembly in Materials ; Polydiacetylene-based materials and applications ; Hydrogels: synthesis, properties, applications
Authors: Uttam Chakraborty | Andrey Fedulin | Axel Jacobi von Wangelin
Source: ChemCatChem (article, 2022-10-31)
Field: Chemistry — Inorganic Chemistry

Synthesis and Catalysis of Anionic Amido Iron(II) Complexes Low-coordinate, open-shell 3d metal complexes have attracted great attention due to their critical role in several catalytic transformations but have been notoriously difficult to prepare and study due to their high lability. Here, we report the synthesis of a heteroleptic tri-coordinate amidoferrate that displays high catalytic activity in the regioselective hydrosilylation of alkenes. Catalysis ; Chemistry ; Combinatorial chemistry ; Organic chemistry Asymmetric Hydrogenation and Catalysis ; Chemical Synthesis and Reactions ; Chemical Synthesis and Analysis
Authors: Dimitry Grebenyuk | Mirijam Zobel | Dmitry Tsymbarenko
Source: Polymers (article, 2022-08-16)
Field: Materials Science — Materials Chemistry

Partially Ordered Lanthanide Carboxylates with a Highly Adaptable 1D Polymeric Structure A new family of 14 isostructural [Ln(piv)<sub>3</sub>(en)]<sub>∞</sub> lanthanide pivalate (piv<sup>-</sup>, 2,2-dimethylpropanoate) complexes with ethylenediamine (en) was synthesized by a topology-preserving transformation from 1D coordination polymers [Ln(piv)<sub>3</sub>]<sub>∞</sub>. The crystal structures of the compounds were determined by single-crystal and powder X-ray diffraction, which demonstrated that despite the regular ligand arrangement within the chains, the latter are intricately packed within the partially ordered crystal, as only two of four ligands are strictly bound by the translational symmetry. The peculiarities of the lanthanide coordination environment were explored by total X-ray scattering with pair distribution function analysis. Periodic DFT calculations revealed the chain stabilization by intrachain H-bonds and weak interchain interactions. Noticeably, the energy difference was infinitesimally small even between the two considered extreme variants of ordered packing, which is in line with the disturbed packing order of the chains. The luminescent properties of Eu and Tb complexes were investigated in order to prove the energy transfer between lanthanide ions within the heterometallic complex. This opens up the prospect of creating new materials for optical applications. The heterometallic compound Eu<sub>0.05</sub>Tb<sub>0.95</sub>(piv)<sub>3</sub>(en) was synthesized, and was found to demonstrate temperature-dependent luminescence with a linear dependence of the thermometric parameter I(Eu)/I(Tb) within the temperature range from -80 °C to 80 °C, and had a maximum relative sensitivity value of 0.2%/K. Lanthanide ; Materials science ; Chemical engineering ; Polymer chemistry ; Chemistry ; Organic chemistry ; Ion ; Engineering Lanthanide and Transition Metal Complexes ; Polyoxometalates: Synthesis and Applications ; Magnetism in coordination complexes