jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Ramyakrishna Pothu | Harisekhar Mitta | P. Banerjee | Rajender Boddula | Rajesh K. Srivastava | Pramod K. Kalambate | Ramachandra Naik | Ahmed Bahgat Radwan | Noora Al‐Qahtani
Source: Materials Science for Energy Technologies (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

Insights into the influence of Pd loading on CeO2 catalysts for CO2 hydrogenation to methanol One of the most significant industrial processes is the catalytic methanol synthesis from carbon dioxide because methanol is a future energy carrier for producing fuels and high-value-added commodities, the so-called “methanol economy” is carbon neutral. As a solution to climate change, the widespread belief that carbon dioxide can be recycled by hydrogenation into methanol has motivated the development of more efficient and selective catalysts. Efficient 2 wt% Pd/CeO2 catalysts for thermochemical CO2 hydrogenation have recently been investigated. However, the rationale behind the low Pd loading (2 wt%) in CeO2 needs to be clarified, and comprehensive research into Pd tuning is lacking. In this article, we describe the synthesis ofvarious palladium contents (0.5, 1, 2, 4, and 6 wt%) supported on ceria nanorods (Pd/CeO2) for selective hydrogenation of CO2 to methanol under vapor-phase. The impact of Pd on the physicochemical properties of CeO2 was examined using various characterization techniques. The enhanced catalytic activity was caused by the 2 wt% Pd/CeO2 catalyst's most significant level of metallic Pd species, strong interactions between Pd and CeO2, uniform Pd dispersion on CeO2, increased reducibility, oxygen mobility, and weak basic sites. This study reveals that changing the percentage of metal in the catalyst supports a valuable technique for designing efficient oxides-supported metal-based catalysts for CO2 conversions. Catalysis ; Methanol ; Materials science ; Palladium ; Metal ; Chemical engineering ; Nanorod ; Carbon dioxide ; Carbon fibers ; Dispersion (optics) ; Inorganic chemistry ; Nanotechnology ; Organic chemistry ; Chemistry ; Metallurgy ; Composite material ; Composite number Catalytic Processes in Materials Science ; Catalysts for Methane Reforming ; Carbon dioxide utilization in catalysis
Authors: Jiamin Yao | Shaojuan Song | Hang Zhao | Yuan Yao
Source: Drug Delivery (review, 2023-12-11)
Field: Materials Science — Biomaterials

Platinum-based drugs and hydrogel: a promising anti-tumor combination Platinum-based drugs are widely used as first-line anti-tumor chemotherapy agents. However, they also have nonnegligible side effects due to the free drugs in circulation. Therefore, it is necessary to develop efficient and safe delivery systems for better tumor cell targeting. Hydrogel is a promising anti-tumor drug carrier that can form a platinum/hydrogel combination system for drug release, which has shown better anti-tumor effects in some studies. However, there is a lack of systematic summary in this field. This review aims to provide a comprehensive overview of the platinum/hydrogel combination system with the following sections: firstly, an introduction of platinum-based drugs; secondly, an analysis of the platinum/hydrogel combination system; and thirdly, a discussion of the advantages of the hydrogel-based delivery system. We hope this review can offer some insights for the development of the platinum/hydrogel combination system for better cancer therapy. Drug delivery ; Platinum ; Self-healing hydrogels ; Cancer therapy ; Drug ; Materials science ; Cancer ; Nanotechnology ; Pharmacology ; Medicine ; Chemistry ; Internal medicine ; Catalysis Nanoparticle-Based Drug Delivery ; Advanced biosensing and bioanalysis techniques ; Dendrimers and Hyperbranched Polymers
Authors: Hang Zhai | Yuke Fan | Wenjun Zhang | Neta Varsano | Assaf Gal
Source: ACS Biomaterials Science & Engineering (article, 2023-02-01)
Field: Materials Science — Biomaterials

Polymer-Rich Dense Phase Can Concentrate Metastable Silica Precursors and Regulate Their Mineralization Multistep mineralization processes are pivotal in the fabrication of functional materials and are often characterized by far from equilibrium conditions and high supersaturation. Interestingly, such 'nonclassical' mineralization pathways are widespread in biological systems, even though concentrating molecules well beyond their saturation level is incompatible with cellular homeostasis. Here, we show how polymer phase separation can facilitate bioinspired silica formation by passively concentrating the inorganic building blocks within the polymer dense phase. The high affinity of the dense phase to mobile silica precursors generates a diffusive flux against the concentration gradient, similar to dynamic equilibrium, and the resulting high supersaturation leads to precipitation of insoluble silica. Manipulating the chemistry of the dense phase allows to control the delicate interplay between polymer chemistry and silica precipitation. These results connect two phase transition phenomena, mineralization and coacervation, and offer a framework to achieve better control of mineral formation. Coacervate ; Supersaturation ; Mineralization (soil science) ; Polymer ; Metastability ; Precipitation ; Chemical engineering ; Chemistry ; Phase (matter) ; Materials science ; Nanotechnology ; Chromatography ; Organic chemistry Diatoms and Algae Research ; Calcium Carbonate Crystallization and Inhibition ; Paleontology and Stratigraphy of Fossils
Authors: Luís Pereira | Frederico Castelo Ferreira | Filipa Pires | Carla A. M. Portugal
Source: Membranes (article, 2023-07-17)
Field: Materials Science — Biomaterials

Magnetic-Responsive Liposomal Hydrogel Membranes for Controlled Release of Small Bioactive Molecules—An Insight into the Release Kinetics This work explores the unique features of magnetic-responsive hydrogels to obtain liposomal hydrogel delivery platforms capable of precise magnetically modulated drug release based on the mechanical responses of these hydrogels when exposed to an external magnetic field. Magnetic-responsive liposomal hydrogel delivery systems were prepared by encapsulation of 1,2-dipalmitoyl-sn-glycero-3-phosphocoline (DPPC) multilayered vesicles (MLVs) loaded with ferulic acid (FA), i.e., DPPC:FA liposomes, into gelatin hydrogel membranes containing dispersed iron oxide nanoparticles (MNPs), i.e., magnetic-responsive gelatin. The FA release mechanisms and kinetics from magnetic-responsive liposomal gelatin were studied and compared with those obtained with conventional drug delivery systems, e.g., free liposomal suspensions and hydrogel matrices, to access the effect of liposome entrapment and magnetic field on FA delivery. FA release from liposomal gelatin membranes was well described by the Korsmeyer-Peppas model, indicating that FA release occurred under a controlled diffusional regime, with or without magnetic stimulation. DPPC:FA liposomal gelatin systems provided smoother controlled FA release, relative to that obtained with the liposome suspensions and with the hydrogel platforms, suggesting the promising application of liposomal hydrogel systems in longer-term therapeutics. The magnetic field, with low intensity (0.08 T), was found to stimulate the FA release from magnetic-responsive liposomal gelatin systems, increasing the release rates while shifting the FA release to a quasi-Fickian mechanism. The magnetic-responsive liposomal hydrogels developed in this work offer the possibility to magnetically activate drug release from these liposomal platforms based on a non-thermal related delivery strategy, paving the way for the development of novel and more efficient applications of MLVs and liposomal delivery systems in biomedicine. Liposome ; Membrane ; Kinetics ; Controlled release ; Self-healing hydrogels ; Biophysics ; Chemistry ; Chemical engineering ; Materials science ; Nanotechnology ; Polymer chemistry ; Biochemistry ; Biology ; Engineering Nanoparticle-Based Drug Delivery ; Hydrogels: synthesis, properties, applications ; Polymer Surface Interaction Studies
Authors: Gaétan Archer | Kunlong Song | Maurice Médebielle | Jérémy Merad
Source: ChemPhotoChem (article, 2023-06-07)
Field: Chemistry — Organic Chemistry

Merging Organocatalysis and Photocatalysis: A New Momentum in Covalent Radical Catalysis Abstract The use of free radicals as organocatalysts constitutes a powerful strategy to activate and functionalize unsaturated carbon chains. Indeed, the unique affinity of open‐shell species for alkenes and alkynes can be rerouted to achieve the catalytic covalent activation of the substrate and control a subsequent radical cascade. However, the field of covalent radical catalysis has remained challenging for decades due to important issues in terms of catalyst handling, reaction design and viability. Recently, these pitfalls have been addressed one by one by the use of photocatalysis to control the generation and the reactivity of radical catalysts. This Concept article aims to highlight recent achievements in the field of photocatalyzed covalent radical catalysis and the perspectives offered by such catalytic combinations. The reaction mechanisms and the interconnection between the catalytic cycles are reviewed with the hope of demonstrating the synthetic potential of this approach and foster a rapid growth of this nascent topic. Catalysis ; Organocatalysis ; Covalent bond ; Photocatalysis ; Photoredox catalysis ; Radical ; Chemistry ; Reactivity (psychology) ; Combinatorial chemistry ; Substrate (aquarium) ; Nanotechnology ; Enantioselective synthesis ; Organic chemistry ; Materials science Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques ; Catalytic C–H Functionalization Methods
Authors: Austin L. Raithel | William E. Meador | Tea-Yon Kim | Richard J. Staples | Jared H. Delcamp | Thomas W. Hamann
Source: Journal of the American Chemical Society (article, 2023-01-03)
Field: Materials Science — Materials Chemistry

Molecular Switch Cobalt Redox Shuttle with a Tunable Hexadentate Ligand Strong-field hexadentate ligands were synthesized and coordinated to cobalt metal centers to result in three new low-spin to low-spin Co(III/II) redox couples. The ligand backbone has been modified with dimethyl amine groups to result in redox potential tuning of the Co(III/II) redox couples from -200 to -430 mV versus Fc<sup>+/0</sup>. The redox couples surprisingly undergo a reversible molecular switch rearrangement from five-coordinate Co(II) to six-coordinate Co(III) despite the ligands being hexadentate. The complexes exhibit modestly faster electron self-exchange rate constants of 2.2-4.2 M<sup>-1</sup> s<sup>-1</sup> compared to the high-spin to low-spin redox couple [Co(bpy)<sub>3</sub>]<sup>3+/2+</sup> at 0.27 M<sup>-1</sup> s<sup>-1</sup>, which is attributed to the change in spin state being somewhat offset by this coordination switching behavior. The complexes were utilized as redox shuttles in dye-sensitized solar cells with the near-IR <b>AP25</b> + <b>D35</b> dye system and exhibited improved photocurrents over the [Co(bpy)<sub>3</sub>]<sup>3+/2+</sup> redox shuttle (19.8 vs 18.0 mA/cm<sup>2</sup>). Future directions point toward pairing the low-spin to low-spin Co(II/III) tunable series to dyes with significantly more negative highest occupied molecular orbital potentials that absorb into the near-IR where outer sphere redox shuttles have failed to produce efficient dye regeneration. Chemistry ; Redox ; Cobalt ; Ligand (biochemistry) ; Photochemistry ; Crystallography ; Inorganic chemistry Porphyrin and Phthalocyanine Chemistry ; TiO2 Photocatalysis and Solar Cells ; Advanced oxidation water treatment
Authors: Seung Hyeon Weon | Jiwoo Han | Yong‐Keun Choi | Saerom Park | Sang Hyun Lee
Source: Gels (article, 2023-08-05)
Field: Chemistry — Organic Chemistry

Development of Blended Biopolymer-Based Photocatalytic Hydrogel Beads for Adsorption and Photodegradation of Dyes Blended biopolymer-based photocatalytic hydrogel beads were synthesized by dissolving the biopolymers in 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]), adding TiO2, and reconstituting the beads with ethanol. The incorporation of modifying biopolymer significantly enhanced the adsorption capacity of the cellulose/TiO2 beads. Cellulose/carrageenan/TiO2 beads exhibited a 7.0-fold increase in adsorption capacity for methylene blue (MB). In contrast, cellulose/chitosan/TiO2 beads showed a 4.8-fold increase in adsorption capacity for methyl orange (MO) compared with cellulose/TiO2 beads. In addition, cellulose/TiO2 microbeads were prepared through the sol–gel transition of the [Emim][Ac]-in-oil emulsion to enhance photodegradation activity. These microbeads displayed a 4.6-fold higher adsorption capacity and 2.8-fold higher photodegradation activity for MB than the millimeter-sized beads. Furthermore, they exhibited superior dye removal efficiencies for various dyes such as Congo red, MO, MB, crystal violet, and rhodamine B, surpassing the performance of larger beads. To expand the industrial applicability of the microbeads, biopolymer/TiO2 magnetic microbeads were developed by incorporating Fe2O3. These magnetic microbeads outperformed millimeter-sized beads regarding the efficiency and time required for MB removal from aqueous solutions. Furthermore, the physicochemical properties of magnetic microbeads can be easily controlled by adjusting the type of biopolymer modifier, the TiO2 and magnetic particle content, and the ratio of each component based on the target molecule. Therefore, biopolymer-based photocatalytic magnetic microbeads have great potential not only in environmental fields but also in biomedical fields. Biopolymer ; Photodegradation ; Adsorption ; Photocatalysis ; Materials science ; Chemical engineering ; Self-healing hydrogels ; Nanotechnology ; Chemistry ; Polymer ; Polymer chemistry ; Composite material ; Organic chemistry ; Catalysis Nanomaterials for catalytic reactions ; TiO2 Photocatalysis and Solar Cells ; Electrospun Nanofibers in Biomedical Applications
Authors: Grazia Giuseppina Politano | C. Versacé
Source: Crystals (article, 2023-09-08)
Field: Materials Science — Materials Chemistry

Recent Advances in the Raman Investigation of Structural and Optical Properties of Graphene and Other Two-Dimensional Materials This research work presents our recent advancements in the study of graphene and other two-dimensional (2D) materials. This review covers studies on graphene oxide (GO) thin films deposited on various substrates, including titanium and silver thin films. The analysis reveals the role of surface-enhanced Raman scattering (SERS) and the influence of film thickness and laser intensity on the observed Raman peaks. Investigations of a silver/GO/gold sandwich structure demonstrate the presence of sharp Raman modes attributed to localized surface plasmon resonances. This review also discusses the characterization of exfoliation-synthesized graphene nanoplatelet (GNPs) thin films and of single-layer graphene deposited via chemical vapor deposition (CVD). The optical properties of molybdenum disulfide (MoS2) films are also explored. The utilization of micro-Raman spectroscopy provides valuable insights into the structural and optical properties of graphene and other 2D materials. These results hold the potential to drive advancements in various applications, such as electronics, photonics, and nanocomposites. Graphene ; Materials science ; Raman spectroscopy ; Exfoliation joint ; Chemical vapor deposition ; Molybdenum disulfide ; Nanotechnology ; Raman scattering ; Thin film ; Characterization (materials science) ; Nanocomposite ; Oxide ; Optoelectronics ; Optics ; Composite material Graphene research and applications ; 2D Materials and Applications ; Graphene and Nanomaterials Applications
Authors: Rosalin Bhanja | Shyamal Kanti Bera | Prasenjit Mal
Source: Chemistry - An Asian Journal (review, 2023-09-25)
Field: Chemistry — Organic Chemistry

Photocatalyst‐ and Transition Metal‐Free Light‐Induced Borylation Reactions The increasing global warming concerns have propelled a surge in the demand for sustainable energy sources within the domain of synthetic organic chemistry. A particularly prominent area of research has been the development of mild synthetic strategies for generating heterocyclic compounds. Heterocyclic compounds containing boron have notably risen to prominence as pivotal reagents in a myriad of organic transformations, showcasing their wide-ranging applicability. This comprehensive review is aimed at collecting the literature pertaining to borylation reactions induced by light, specifically focusing on photocatalyst-free and transition metal-free methodologies. The central emphasis is on delving into selective mechanistic investigations. The amalgamation and analysis of these research insights elucidate the substantial potential inherent in eco-friendly approaches for synthesizing heterocyclic compounds, thus propelling the landscape of sustainable organic chemistry. Borylation ; Organic synthesis ; Nanotechnology ; Photocatalysis ; Chemistry ; Biochemical engineering ; Reagent ; Organometallic chemistry ; Combinatorial chemistry ; Environmental science ; Materials science ; Organic chemistry ; Catalysis ; Engineering Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques ; Catalytic C–H Functionalization Methods
Authors: Zheao Huang | Jakob Rath | Qiancheng Zhou | Alexey Cherevan | Shaghayegh Naghdi | Dominik Eder
Source: Small (article, 2023-12-21)
Field: Chemistry — Inorganic Chemistry

Hierarchically Micro‐ and Mesoporous Zeolitic Imidazolate Frameworks Through Selective Ligand Removal A new method to engineer hierarchically porous zeolitic imidazolate frameworks (ZIFs) through selective ligand removal (SeLiRe) is presented. This innovative approach involves crafting mixed-ligand ZIFs (ML-ZIFs) with varying proportions of 2-aminobenzimidazole (NH<sub>2</sub>-bIm) and 2-methylimidazole (2-mIm), followed by controlled thermal treatments. This process creates a dual-pore system, incorporating both micropores and additional mesopores, suggesting selective cleavage of metal-ligand coordination bonds. Achieving this delicate balance requires adjustment of heating conditions for each mixed-ligand ratio, enabling the targeted removal of NH<sub>2</sub>-bIm from a variety of ML-ZIFs while preserving their inherent microporous framework. Furthermore, the distribution of the initial thermolabile ligand plays a pivotal role in determining the resulting mesopore architecture. The efficacy of this methodology is aptly demonstrated through the assessment of hierarchically porous ZIFs for their potential in adsorbing diverse organic dyes in aqueous environments. Particularly striking is the performance of the 10%NH<sub>2</sub>-ZIF-2 h, which showcases an astonishing 40-fold increase in methylene blue adsorption capacity compared to ZIF-8, attributed to larger pore volumes that accelerate the diffusion of dye molecules to adsorption sites. This versatile technique opens new avenues for designing micro/mesoporous ZIFs, particularly suited for liquid media scenarios necessitating efficient active site access and optimal diffusion kinetics, such as purification, catalysis, and sensing. Zeolitic imidazolate framework ; Mesoporous material ; Imidazolate ; Ligand (biochemistry) ; Adsorption ; Microporous material ; Materials science ; Metal-organic framework ; Chemical engineering ; Nanotechnology ; Porosity ; Chemistry ; Combinatorial chemistry ; Catalysis ; Inorganic chemistry ; Organic chemistry ; Composite material Metal-Organic Frameworks: Synthesis and Applications ; Covalent Organic Framework Applications ; Mesoporous Materials and Catalysis
Authors: Chenxin Wang | Zirui Dong | Jiajun Chen | Zhili Li | Lu Gan | Jiong Yang | Jiye Zhang | Jun Luo
Source: Science China Materials (article, 2023-06-14)
Field: Materials Science — Materials Chemistry

Structure and thermoelectric property evolution of TiFe1.1−xNixSb with the filling of Ni Thermoelectric effect ; Materials science ; Alloy ; Thermoelectric materials ; Valence electron ; Doping ; Crystal structure ; Phase (matter) ; Condensed matter physics ; Single phase ; Electrical resistivity and conductivity ; Lattice constant ; Thermal conductivity ; Analytical Chemistry (journal) ; Electron ; Crystallography ; Metallurgy ; Thermodynamics ; Optoelectronics ; Composite material ; Diffraction Advanced Thermoelectric Materials and Devices ; Heusler alloys: electronic and magnetic properties ; MXene and MAX Phase Materials
Authors: Yin Fang | Barbara Lonetti | Jean‐Daniel Marty | Nancy Lauth‐de Viguerie
Source: Colloids and Surfaces A Physicochemical and Engineering Aspects (article, 2023-06-25)
Field: Chemistry — Organic Chemistry

CO2-switchable thermoresponsiveness of poly(N,N-(diethylamino)ethyl acrylamide)-based homo- and copolymers in water Copolymer ; Polymer ; Polymer chemistry ; Monomer ; Chain transfer ; Polymerization ; Aqueous solution ; Materials science ; Acrylamide ; Cloud point ; Solubility ; Raft ; Chemical engineering ; Chemistry ; Radical polymerization ; Organic chemistry Advanced Polymer Synthesis and Characterization ; Covalent Organic Framework Applications ; Carbon Dioxide Capture Technologies
Authors: Yang Wang | Feng Gao | Shuai Zhou | Po Hu | Jiajun Fu
Source: Science China Materials (article, 2023-07-25)
Field: Materials Science — Materials Chemistry

Novel strategy for energy transfer via Ho3+ as a bridge in upconversion nanoparticles Photon upconversion ; Materials science ; Excited state ; Ion ; Excitation ; Energy transfer ; Lanthanide ; Luminescence ; Optoelectronics ; Ytterbium ; Acceptor ; Doping ; Nanotechnology ; Atomic physics ; Chemistry ; Physics Luminescence Properties of Advanced Materials ; Luminescence and Fluorescent Materials ; Perovskite Materials and Applications
Authors: Se‐Hyeong Jung | Fabian Meyer | Sven T. Hörnig | Michelle Bund | Bernhard Häßel | Luis P. B. Guerzoni | Laura De Laporte | Ghazi Ben Messaoud | Silvia P. Centeno | Andrij Pich
Source: Small (article, 2023-09-13)
Field: Materials Science — Materials Chemistry

On‐Chip Fabrication of Colloidal Suprastructures by Assembly and Supramolecular Interlinking of Microgels In this report, a versatile method is demonstrated to create colloidal suprastructures by assembly and supramolecular interlinking of microgels using droplet-based microfluidics. The behavior of the microgels is systematically investigated to evaluate the influence of their concentration on their distribution between the continuous, the droplet phase, and the interface. At low concentrations, microgels are mainly localized at the water-oil interface whereas an excess of microgels results, following the complete coverage of the water-oil interface, in their distribution in the continuous phase. To stabilize the colloidal suprastructure, on-chip gelation is introduced by adding natural polyphenol tannic acid (TA) in the water phase. TA forms interparticle linking between the poly(N-vinylcaprolactam) (PVCL) microgels by supramolecular interactions. The combination of supramolecular interlinking with the variation of the microgel concentration in microfluidic droplets enables on-chip fabrication of defined colloidal suprastructures with morphologies ranging from colloidosomes to colloidal supraballs. The obtained supracolloidal structures exhibit a pH-responsive behavior with a disintegration at alkaline conditions within a scale of seconds. The destabilization process results from the deprotonation of phenolic groups and destruction of hydrogen bonds with PVCL chains at higher pH. Supramolecular chemistry ; Microfluidics ; Materials science ; Colloid ; Fabrication ; Chemical engineering ; Phase (matter) ; Nanotechnology ; Hydrogen bond ; Tannic acid ; Supramolecular assembly ; Pickering emulsion ; Chemistry ; Molecule ; Organic chemistry ; Nanoparticle Pickering emulsions and particle stabilization ; Innovative Microfluidic and Catalytic Techniques Innovation ; 3D Printing in Biomedical Research