jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Monika Bhattu | Roberto Acevedo | A.H. Shnain
Source: E3S Web of Conferences (review, 2024-01-01)
Field: Materials Science — Materials Chemistry

A comprehensive review on the synthesis routes, properties and potential applications of ZnFe<sub>2</sub>O<sub>4</sub> ferrites Zinc ferrite (ZnFe₂O₄) is a prominent spinel-type ferrite that has received significant attention over the recent years. This comprehensive review delves into the various synthesis routes employed to produce ZnFe₂O₄ ferrites, including traditional ceramic methods, sol-gel techniques, co-precipitation, and hydrothermal synthesis, among others. Each method’s advantages and limitations are deliberated, with a weight on controlling size of the particle, morphology, and crystallinity to enhance material performance. The review further explores the intrinsic properties of ZnFe₂O₄, focusing on its magnetic behaviour, dielectric properties, and structural stability under varying conditions. The material’s potential applications are broad, spanning catalysis, energy storage, gas sensing, and biomedical uses like, magnetic resonance imaging (MRI) and drug delivery. Additionally, the environmental applications of ZnFe₂O₄, particularly in photocatalysis and wastewater treatment, are highlighted. Future research directions are proposed, aiming at optimizing synthesis conditions to tailor specific properties for advanced applications, particularly in nanotechnology and sustainable energy solutions. Materials science ; Nanotechnology ; Engineering physics ; Engineering Magnetic Properties and Synthesis of Ferrites ; Multiferroics and related materials ; Iron oxide chemistry and applications
Authors: Magdalena Piringer | Mario Hofer | Lukas S. Vogl | Péter Mayer | Mario Waser
Source: Advanced Synthesis & Catalysis (article, 2024-03-04)
Field: Chemistry — Organic Chemistry

Enantioselective Syntheses of 3,4‐Dihydropyrans Employing Isochalcogenourea‐Catalyzed Formal (4+2)‐Cycloadditions of Allenoates We herein successfully demonstrate the use of chiral isochalcogenoureas as Lewis Base catalysts for a variety of (4+2)-cycloaddition reactions of allenoates and different Michael acceptors. In all cases the same structural key-motive, a dihydropyran with a (Z)-configurated exocyclic double bond could be accessed as the major regio- and diastereoisomer in an enantioselective manner. Furthermore, these chiral dihydropyrans were successfully engaged in different follow-up transformations. Enantioselective synthesis ; Chemistry ; Catalysis ; Organocatalysis ; Combinatorial chemistry ; Organic chemistry Asymmetric Synthesis and Catalysis ; Synthetic Organic Chemistry Methods ; Catalytic Alkyne Reactions
Authors: Michael J. Spicuzza | Shweta Gaikwad | Steven Huss | Annemarie A. Lee | Cristina V. Craescu | Anna Griggs | Joshmi Joseph | Mark Puthenpurayil | Wilson Lin | Christopher J. Matarazzo | S. Prentiss Baldwin | Victoria Perez | Diego Alejandro Rodriguez-Acevedo | John R. Swierk | Elizabeth Elacqua
Source: Polymer Chemistry (article, 2024-01-01)
Field: Chemistry — Organic Chemistry

Visible-light-mediated Diels–Alder reactions under single-chain polymer confinement: investigating the role of the crosslinking moiety on catalyst activity Macromolecular scaffolds are rapidly emerging in catalysis owing to the ability to control catalyst placement at precise locations. This spatial proximity allows for enhanced catalyst activity that may not be observed using small molecules. Herein, we describe a triphenylpyrylium (TPT)-based visible-light active single-chain polymer nanoparticle (SCNP) that facilitates the radical cation [4 + 2]-cycloaddition. We find that the catalytic activity is highly dependent on the styrylarene comonomer used, wherein it can act as a redox mediator under confinement, increasing the catalytic turnover (TON) by up to 30 times in comparison to free TPT in solution. Mechanistic studies indicate that TPT excited states are quenched by the acene, with the resultant radical cation formed from naphthalene-based SCNPs able to proceed in oxidizing the dienophile in the elementary step of the reaction, while leading to near quantitative yields of the cycloadduct. The TPT-SCNP demonstrates enhanced photocatalyst efficiency compared to molecular TPT, and is able to be recycled and reused in three iterations of the reaction prior to decreased performance from photobleaching. Our results overall suggest that the confined nature of the SCNP and spatial proximity of acene-based pendants enforces their participation as cocatalytic redox mediators that impart enhanced photoredox catalysis under confinement. Catalysis ; Chemistry ; Photochemistry ; Acene ; Moiety ; Cycloaddition ; Redox ; Naphthalene ; Oxidizing agent ; Comonomer ; Combinatorial chemistry ; Molecule ; Ethylene ; Organic chemistry Radical Photochemical Reactions ; Photochromic and Fluorescence Chemistry ; Oxidative Organic Chemistry Reactions
Authors: Xavier Marset | Salvador Montilla-Verdú | Elio Rico | Néstor Guijarro
Source: ACS electrochemistry. (review, 2024-11-27)
Field: Chemistry — Organic Chemistry

Beyond Conventional Organic Electrosynthesis: The Role of Fluorinated Solvents Organic electrosynthesis has emerged as a unique platform for chemical manufacturing owing to not only the use of electricity as a green reagent but also, especially, to its distinct reactivity. While conventional solvents are sought to remain inert and solely provide a liquid environment for the electrochemical process to occur, fluorinated alcohol solvents have been shown to redefine this concept. In fact, the singular properties of these solvents allow them to actively interact with the substrates and reaction intermediates driving dramatic changes in the chemo- and regioselectivity as well as on the reaction yields. Given the rapid permeation of these solvents in the burgeoning field of electro-organic synthesis, this mini-review strives to provide a concise but up-to-date critical revision for the growing community of scientists working at the interface of synthetic chemistry and electrochemistry. Here, the main electrosynthetic transformations where they have been exploited besides their key role in activating certain reaction pathways will be highlighted. Finally, a forward-looking perspective on the more practical evolution and implementation of these systems will be discussed. Electrosynthesis ; Chemistry ; Environmental chemistry ; Electrochemistry ; Electrode ; Physical chemistry Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques ; Fluorine in Organic Chemistry
Authors: Miralem Salihović | Emmanuel Pameté | Stefanie Arnold | Irena Sulejmani | Theresa Bartschmid | Nicola Hüsing | Gerhard Fritz‐Popovski | Chaochao Dun | Jeffrey J. Urban | Volker Presser | Michael S. Elsaesser
Source: Energy Advances (article, 2024-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Black goes green: single-step solvent exchange for sol-gel synthesis of carbon spherogels as high-performance supercapacitor electrodes Nanoporous carbon materials with customized structural features enable sustainable and electrochemical applications through improved performance and efficiency. Carbon spherogels (highly porous carbon aerogel materials consisting of an assembly of hollow carbon nanosphere units with uniform diameters) are desirable candidates as they combine exceptional electrical conductivity, bespoke shell porosity, tunability of the shell thickness, and a high surface area. Herein, we introduce a novel and more environmentally friendly sol-gel synthesis of resorcinol-formaldehyde (RF) templated by polystyrene spheres, forming carbon spherogels in an organic solvent. By tailoring the molar ratio of resorcinol to isopropyl alcohol (R/IPA) and the concentration of polystyrene, the appropriate synthesis conditions were identified to produce carbon spherogels with adjustable wall thicknesses. A single-step solvent exchange process from deionized water to isopropyl alcohol reduces surface tension within the porous gel network, making this approach significantly time and cost-effective. The lower surface tension of IPA enables solvent extraction under ambient conditions, allowing for direct carbonization of RF gels while maintaining a specific surface area loss of less than 20% compared to supercritically dried counterparts. The specific surface areas obtained after physical activation with carbon dioxide are 2300-3600 m<sup>2</sup> g<sup>-1</sup>. Transmission and scanning electron microscopy verify the uniform, hollow carbon sphere network morphology. Specifically, those carbon spherogels are high-performing electrodes for energy storage in a supercapacitor setup featuring a specific capacitance of up to 204 F g<sup>-1</sup> at 200 mA g<sup>-1</sup> using 1 M potassium hydroxide (KOH) solution as the electrolyte. Supercapacitor ; Carbonization ; Materials science ; Chemical engineering ; Carbon fibers ; Potassium hydroxide ; Specific surface area ; Activated carbon ; Carbon black ; Polystyrene ; Aerogel ; Nanotechnology ; Scanning electron microscope ; Adsorption ; Capacitance ; Electrode ; Composite material ; Organic chemistry ; Chemistry ; Catalysis ; Composite number Supercapacitor Materials and Fabrication ; Aerogels and thermal insulation ; Mesoporous Materials and Catalysis
Authors: Juan Carlos Pérez‐Sánchez | Raquel P. Herrera | M. Concepción Gimeno
Source: Chemistry - A European Journal (article, 2024-05-31)
Field: Chemistry — Organic Chemistry

The Potential of Self‐Activating Au(I) Complexes in Gold Catalysis Gold catalysis has emerged as a groundbreaking field in synthetic chemistry, revolutionizing numerous organic transformations. Despite the significant achieved advancements, the mechanistic understanding behind many gold-catalyzed reactions remains elusive. This Concept article covers the so-called "self-activating" Au(I) complexes, sorting out their pivotal role in gold catalysis. We comment on how Au(I) complexes can undergo self-activation, triggering diverse catalytic transformations without the need for external additives. The most important examples reported so far that underlie the catalytic activity of these species are discussed. This intrinsic reactivity represents a paradigm shift in gold catalysis, offering new avenues for the design of efficient and sustainable catalytic systems. Furthermore, we explore the factors influencing the stability, reactivity, and selectivity of these Au(I) complexes, providing insights into their synthetic utility and potential applications. This area of research not only advances our fundamental understanding of gold catalysis but also paves the way for the development of novel catalytic strategies with broad implications in organic synthesis and the chemical industry. Catalysis ; Chemistry ; Nanotechnology ; Materials science ; Organic chemistry Catalytic Alkyne Reactions ; Asymmetric Hydrogenation and Catalysis ; Catalysis and Hydrodesulfurization Studies
Authors: Manivannan Madhu | Wei‐Bin Tseng | Yi-Shiuan Chou | A. Santhana Krishna Kumar | Chi‐Yu Lu | Po‐Ling Chang | Wei‐Lung Tseng
Source: Analytical Chemistry (article, 2024-05-23)
Field: Materials Science — Materials Chemistry

Peptide-Directed Synthesis of Aggregation-Induced Emission Enhancement-Active Gold Nanoclusters for Single- and Two-Photon Imaging of Lysosome and Expressed α<sub>v</sub>β<sub>3</sub> Integrin Receptors This study explores the synthesis and characterization of aggregation-induced emission enhancement (AIEE)-active gold nanoclusters (AuNCs), focusing on their near-infrared luminescence properties and potential applications in biological imaging. These AIEE-active AuNCs were synthesized via the NaBH<sub>4</sub>-mediated reduction of HAuCl<sub>4</sub> in the presence of peptides. We systematically investigated the influence of the peptide sequence on the optical features of the AuNCs, highlighting the role of glutamic acid in enhancing their quantum yield (QY). Among the synthesized peptide-stabilized AuNCs, EECEE-stabilized AuNCs exhibited the maximum QY and a pronounced AIEE effect at pH 5.0, making them suitable for the luminescence imaging of intracellular lysosomes. The AIEE characteristic of the EECEE-stabilized AuNCs was demonstrated through examinations using transmission electron microscopy, dynamic light scattering, zeta potential analysis, and single-particle imaging. The formation of the EECEE-stabilized AuNCs was confirmed by size-exclusion chromatography and mass spectrometry. Spectroscopic and electrochemical examinations uncover the formation process of EECEE-stabilized AuNCs, comprising EECEE-mediated reduction, NaBH<sub>4</sub>-induced nucleation, complex aggregation, and subsequent cluster growth. Furthermore, we demonstrated the utility of these AuNCs as luminescent probes for intracellular lysosomal imaging, leveraging their pH-responsive AIEE behavior. Additionally, cyclic arginylglycylaspartic acid (RGD)-modified AIEE dots, derived from cyclic RGD-linked peptide-induced aggregation of EECEE-stabilized AuNCs, were developed for single- and two-photon luminescence imaging of α<sub>v</sub>β<sub>3</sub> integrin receptor-positive cancer cells. Chemistry ; Nanoclusters ; Lysosome ; Two-photon excitation microscopy ; Integrin ; Receptor ; Aggregation-induced emission ; Nanotechnology ; Peptide ; Biophysics ; Biochemistry ; Optics Nanocluster Synthesis and Applications ; Gold and Silver Nanoparticles Synthesis and Applications ; Advanced Nanomaterials in Catalysis
Authors: Yu‐Rong Ni | Michael N. Pillay | Tzu‐Hao Chiu | Jagadeesh Rajaram | Ying‐Yann Wu | Samia Kahlal | Jean‐Yves Saillard | C. W. Liu
Source: Inorganic Chemistry (article, 2024-01-22)
Field: Materials Science — Materials Chemistry

Diselenophosphate Ligands as a Surface Engineering Tool in PdH-Doped Silver Superatomic Nanoclusters The first hydride-doped Pd/Ag superatoms stabilized by selenolates are reported: [PdHAg<sub>19</sub>(dsep)<sub>12</sub>] [dsep = Se<sub>2</sub>P(O<sup><i>i</i></sup>Pr)<sub>2</sub>] <b>1</b> and [PdHAg<sub>20</sub>(dsep)<sub>12</sub>]<sup>+</sup> <b>2</b>. <b>1</b> was derived from the targeted transformation of [PdHAg<sub>19</sub>(dtp)<sub>12</sub>] [dtp = S<sub>2</sub>P(O<sup><i>i</i></sup>Pr)<sub>2</sub>] by ligand exchange, whereas <b>2</b> was obtained from the addition of trifluoroacetic acid to <b>1</b>, resulting in a symmetric redistribution of the capping silver atoms. The transformations are all achieved while retaining an 8-electron superatomic configuration. VT-NMR attests to the good stability of the NCs in solution, and single-crystal X-ray diffraction reveals the crucial role that the interstitial hydride plays in directing the position of the capping silver atoms. The total structures are reported alongside their electronic and optical properties. <b>1</b> and <b>2</b> are phosphorescent with a lifetime of 73 and 84 μs at 77 K, respectively. The first antibacterial activity data for superatomic bimetallic Pd/Ag nanoclusters are also reported. Chemistry ; Nanoclusters ; Bimetallic strip ; Hydride ; Trifluoroacetic acid ; Crystallography ; Doping ; Redistribution (election) ; Stereochemistry ; Metal ; Organic chemistry ; Condensed matter physics Nanocluster Synthesis and Applications ; Pharmacological Effects and Toxicity Studies ; Gold and Silver Nanoparticles Synthesis and Applications
Authors: Long Zheng | Lei Xu | Ping Gu | Ye Chen
Source: Nanoscale (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Lattice engineering of noble metal-based nanomaterials <i>via</i> metal–nonmetal interactions for catalytic applications Noble metal-based nanomaterials possess outstanding catalytic properties in various chemical reactions. However, the increasing cost of noble metals severely hinders their large-scale applications. A cost-effective strategy is incorporating noble metals with light nonmetal elements (<i>e.g.</i>, H, B, C, N, P and S) to form noble metal-based nanocompounds, which can not only reduce the noble metal content, but also promote their catalytic performances by tuning their crystal lattices and introducing additional active sites. In this review, we present a concise overview of the recent advancements in the preparation and application of various kinds of noble metal-light nonmetal binary nanocompounds. Besides introducing synthetic strategies, we focus on the effects of introducing light nonmetal elements on the lattice structures of noble metals and highlight notable progress in the lattice strain engineering of representative core-shell nanostructures derived from these nanocompounds. In the meantime, the catalytic applications of the light element-incorporated noble metal-based nanomaterials are discussed. Finally, we discuss current challenges and future perspectives in the development of noble metal-nonmetal based nanomaterials. Nonmetal ; Materials science ; Noble metal ; Nanomaterials ; Lattice (music) ; Metal ; Catalysis ; Strain engineering ; Nanostructure ; Nanotechnology ; Metallurgy ; Chemistry ; Physics ; Organic chemistry Copper-based nanomaterials and applications ; MXene and MAX Phase Materials ; Nanoporous metals and alloys
Authors: Gonzalo Tortella | Paola Fincheira | Olga Rubilar | Sebastian Leiva | I. Fernández | Mauricio Schoebitz | Milena T. Pelegrino | A. Paganotti | Roberta Albino dos Reis | Amedea B. Seabra
Source: Antibiotics (review, 2024-11-05)
Field: Materials Science — Materials Chemistry

Nanoparticle-Based Nitric Oxide Donors: Exploring Their Antimicrobial and Anti-Biofilm Capabilities <b>Background:</b> Nitric oxide (NO) is an antimicrobial and anti-biofilm agent with significant potential for combating biofilm-associated infections and antibiotic resistance. However, owing to its high reactivity due to the possession of a free radical and short half-life (1-5 s), the practical application of NO in clinical settings is challenging. <b>Objectives</b>: This review explores the development of NO-releasing nanoparticles that provide a controlled, targeted delivery system for NO, enhancing its antimicrobial efficacy while minimizing toxicity. The review discusses various NO donors, nanoparticle platforms, and how NO disrupts biofilm formation and eradicates pathogens. Additionally, we examine the highly encouraging and inspiring results of NO-releasing nanoparticles against multidrug-resistant strains and their applications in medical and environmental contexts. This review highlights the promising role of NO-based nanotechnologies in overcoming the challenges posed by increasing antibiotic resistance and biofilm-associated infections. <b>Conclusions:</b> Although NO donors and nanoparticle delivery systems show great potential for antimicrobial and anti-biofilm uses, addressing challenges related to controlled release, toxicity, biofilm penetration, resistance, and clinical application is crucial. Biofilm ; Antimicrobial ; Nanoparticle ; Nitric oxide ; Chemistry ; Microbiology ; Nanotechnology ; Materials science ; Bacteria ; Biology ; Organic chemistry Advanced Nanomaterials in Catalysis ; Nanoplatforms for cancer theranostics ; Nitric Oxide and Endothelin Effects
Authors: Asma S. Al‐Wasidi | Ehab A. Abdelrahman | Reem Shah | Nermin Ali Abdelhakim | Fawaz A. Saad
Source: Scientific Reports (article, 2024-12-19)
Field: Chemistry — Organic Chemistry

Facile synthesis of novel nanocomposite composed of Co3O4, MgO, and Mg3B2O6 for malachite green dye decontamination from aqueous media Malachite green is a hazardous chemical that poses serious threats to aquatic ecosystems due to its toxicity and persistence in the environment. Additionally, it is harmful to human health, recognized as a carcinogenic and mutagenic agent that can cause long-term adverse effects. Hence, in this study, malachite green dye was efficiently removed from aqueous media using Co<sub>3</sub>O<sub>4</sub>/MgO/Mg<sub>3</sub>B<sub>2</sub>O<sub>6</sub> novel nanocomposites, known as CBM600 and CBM800. The CBM600 and CBM800 nanocomposites were facilely fabricated through the Pechini sol-gel procedure at 600 and 800 °C, respectively. Besides, X-ray diffraction analysis showed their crystalline structures, including Co<sub>3</sub>O<sub>4</sub> and MgO in cubic systems, and Mg<sub>3</sub>B<sub>2</sub>O<sub>6</sub> in an orthorhombic system. For the CBM600 and CBM800 nanocomposites, the average crystal sizes are 40.76 nm and 57.43 nm, with BET surface areas of 74.25 m<sup>2</sup>/g and 57.59 m<sup>2</sup>/g, respectively. The highest uptake capacities for malachite green dye by the CBM600 and CBM800 nanocomposites are 492.61 mg/g and 440.53 mg/g, respectively. The pseudo-second-order model and Langmuir isotherm were the best fits for the adsorption data. Also, the uptake of malachite green dye by the CBM600 and CBM800 nanocomposites is spontaneous, physical, and exothermic. The nanocomposites were regenerated using 6 M HCl and repeatedly used to remove malachite green dye with very small loss in efficiency, demonstrating their robust reusability. Malachite green ; Nanocomposite ; Aqueous solution ; Nuclear chemistry ; Materials science ; Orthorhombic crystal system ; Brilliant green ; Adsorption ; Chemical engineering ; Chemistry ; Nanotechnology ; Organic chemistry ; Crystal structure Nanomaterials for catalytic reactions ; Adsorption and biosorption for pollutant removal ; Pigment Synthesis and Properties
Authors: Sijia Hua | Xiulin Dong | Qiuxia Peng | Kun Zhang | Xiaofeng Zhang | Jianfeng Yang
Source: Journal of Nanobiotechnology (article, 2024-05-25)
Field: Materials Science — Materials Chemistry

Single-atom nanozymes shines diagnostics of gastrointestinal diseases Various clinical symptoms of digestive system, such as infectious, inflammatory, and malignant disorders, have a profound impact on the quality of life and overall health of patients. Therefore, the chase for more potent medicines is both highly significant and urgent. Nanozymes, a novel class of nanomaterials, amalgamate the biological properties of nanomaterials with the catalytic activity of enzymes, and have been engineered for various biomedical applications, including complex gastrointestinal diseases (GI). Particularly, because of their distinctive metal coordination structure and ability to maximize atom use efficiency, single-atom nanozymes (SAzymes) with atomically scattered metal centers are becoming a more viable substitute for natural enzymes. Traditional nanozyme design strategies are no longer able to meet the current requirements for efficient and diverse SAzymes design due to the diversification and complexity of preparation processes. As a result, this review emphasizes the design concept and the synthesis strategy of SAzymes, and corresponding bioenzyme-like activities, such as superoxide dismutase (SOD), peroxidase (POD), oxidase (OXD), catalase (CAT), and glutathione peroxidase (GPx). Then the various application of SAzymes in GI illnesses are summarized, which should encourage further research into nanozymes to achieve better application characteristics. Nanotechnology ; Atom (system on chip) ; Medicine ; Chemistry ; Computer science ; Materials science Advanced Nanomaterials in Catalysis ; Nanocluster Synthesis and Applications ; Advanced biosensing and bioanalysis techniques