jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Ioannis Ioannidis | Ioannis Pashalidis | Michael Arkas
Source: Gels (article, 2023-08-27)
Field: Chemistry — Inorganic Chemistry

Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels The binding of actinide ions (Am(III) and U(VI)) in aqueous solutions by hybrid silica-hyperbranched poly(ethylene imine) nanoparticles (NPs) and xerogels (XGs) has been studied by means of batch experiments at different pH values (4, 7, and 9) under ambient atmospheric conditions. Both materials present relatively high removal efficiency at pH 4 and pH 7 (>70%) for Am(III) and U(VI). The lower removal efficiency for the nanoparticles is basically associated with the compact structure of the nanoparticles and the lower permeability and access to active amine groups compared to xerogels, and the negative charge of the radionuclide species is formed under alkaline conditions (e.g., UO<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub><sup>4-</sup> and Am(CO<sub>3</sub>)<sub>2</sub><sup>-</sup>). Generally, the adsorption process is relatively slow due to the very low radionuclide concentrations used in the study and is basically governed by the actinide diffusion from the aqueous phase to the solid surface. On the other hand, adsorption is favored with increasing temperature, assuming that the reaction is endothermic and entropy-driven, which is associated with increasing randomness at the solid-liquid interphase upon actinide adsorption. To the best of our knowledge, this is the first study on hybrid silica-hyperbranched poly(ethylene imine) nanoparticle and xerogel materials used as adsorbents for americium and uranium at ultra-trace levels. Compared to other adsorbent materials used for binding americium and uranium ions, both materials show far higher binding efficiency. Xerogels could remove both actinides even from seawater by almost 90%, whereas nanoparticles could remove uranium by 80% and americium by 70%. The above, along with their simple derivatization to increase the selectivity towards a specific radionuclide and their easy processing to be included in separation technologies, could make these materials attractive candidates for the treatment of radionuclide/actinide-contaminated water. Adsorption ; Americium ; Actinide ; Aqueous solution ; Nanoparticle ; Uranium ; Chemistry ; Inorganic chemistry ; Chemical engineering ; Materials science ; Nuclear chemistry ; Organic chemistry ; Nanotechnology Radioactive element chemistry and processing ; Covalent Organic Framework Applications ; Chemical Synthesis and Characterization
Authors: Ryota Imamura | Kota Oto | Kaho Kataoka | Akinori Takasu
Source: ACS Omega (article, 2023-04-12)
Field: Materials Science — Biomaterials

Synthesis and Biodegradability of Tartaric Acid-Based <scp>P</scp>oly(ester-thioether)s via Thiol–Ene Click Polymerization Using scandium triflate [Sc(OTf)<sub>3</sub>] as a catalyst, chemoselective esterification of tartaric acids by 3-butene-1-ol was performed, and we produced three dialkene monomers: l-di(3-butenyl) tartrate (BTA), d-BTA, and <i>meso</i>-BTA. Thiol-ene polyaddition of these dialkenyl tartrates and dithiols including 1,2-ethanedithiol (ED), ethylene bis(thioglycolate) (EBTG), and d,l-dithiothreitol (DTT) proceeded in toluene at 70 °C under nitrogen to give tartrate-containing poly(ester-thioether)s (<i>M</i><sub>n</sub>, (4.2-9.0) × 10<sup>3</sup>; molecular weight distribution (<i>M</i><sub>w</sub>/<i>M</i><sub>n</sub>), 1.6-2.5). In differential scanning calorimetry, the poly(ester-thioether)s showed single <i>T</i><sub>g</sub>s between -25 and -8 °C. In biochemical oxygen demand (BOD) tests using activated sludge, poly(l-BTA-<i>alt</i>-EBTG) and poly(l-BTA-<i>alt</i>-ED) showed 32 and 8% biodegradability, which is comparable to that of similar l-malate-containing poly(ester-thioether)s (23 and 13% biodegradation, respectively). Notably, we observed enantio and diastereo effects on biodegradation because poly(l-BTA-<i>alt</i>-EBTG), poly(d-BTA-<i>alt</i>-EBTG), and poly(<i>meso</i>-BTA-<i>alt</i>- EBTG) showed different degradation behaviors during the biodegradation test (BOD/theoretical oxygen demand (TOD) values after 28 days, 32, 70, and 43%, respectively). Our findings provide insights into the design of biomass-based biodegradable polymers containing chiral centers. Biodegradation ; Thioether ; Chemistry ; Tartaric acid ; Polymer chemistry ; Organic chemistry ; Thiol ; Tartrate ; Nuclear chemistry biodegradable polymer synthesis and properties ; Click Chemistry and Applications ; Antimicrobial agents and applications
Authors: Aquiny Befairlyne T. Mawthoh | Devina Seram | Haobijam James Watt
Source: E3S Web of Conferences (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

Green Synthesized Plant-based Nanotechnology: Cutting Edge Innovation Fostering Sustainability and Revolutionizing Agriculture The development of smart green chemistry methods for the synthesis of metal nanoparticles (MNPs) has gained significant attention from researchers in the last few years. Due to the widespread usage of nanoscale metal ions in various industries such as health care, engineering, environmental protection, agriculture, etc., the synthesis of these materials is a timely subject and requirement. Currently, most of the nanoscale metals are produced chemically, which has unforeseen consequences such as energy and pollution, as well as health hazards. Numerous studies have been conducted to identify an eco-friendly method for producing the nanoparticles. Metal nanoparticle production using living things is one of the recent approaches that is most frequently discussed. The term “green synthesis of nanoparticles” describes the production of various metal nanoparticles using biologically active substances such as plant parts, microbes, and a variety of waste products like vegetable scraps, peels of fruits wastes, eggshell, farm wastes, and so on. Among these choices, plants seem to be the most ideal source for the potential creation of vast numbers of nanoparticles. Biomolecules present in plant extracts can be used to reduce metal ions into nanoparticles in a single-step green synthesis process, which is rapid, and are more stable. These newly synthesized nanoparticles are usually less expensive, easily available, produce less pollution, and enhance the safety of the environment and human. In the field of agriculture, the synthesis of nano-chemicals has the potential to improve fertilizers (slow-release nano fertilizers), pesticides (nano-pesticides), and nano plant growth regulators. Insects, fungi, bacteria, and weeds are among the plant pests that can be controlled with the use of nano-compounds lately. Nanotechnology ; Environmental pollution ; Agriculture ; Environmentally friendly ; Pesticide ; Green chemistry ; Nanoparticle ; Environmental science ; Biotechnology ; Biochemical engineering ; Materials science ; Chemistry ; Engineering ; Environmental protection ; Ecology ; Catalysis ; Biology Nanoparticles: synthesis and applications
Authors: Chaehun Lee | Brian J. Ree | Kai Chen | Ryoya Komaki | Satoshi Katsuhara | Takuya Yamamoto | Rédouane Borsali | Kenji Tajima | Hsin‐Lung Chen | Toshifumi Satoh | Takuya Isono
Source: Giant (article, 2023-11-22)
Field: Materials Science — Materials Chemistry

Ultrasmall 3D network morphologies from biobased sugar–terpenoid hybrid block co-oligomers in the bulk and the thin film states Nanoscale three-dimensional (3D) network morphologies, such as those represented by gyroids accessed by the self-assembly of block copolymers, are highly attractive platforms for the fabrication of nanostructured materials. However, it remains challenging to access such morphologies, especially in the sub-10 nm domain spacing region. Herein, we systematically investigated the microphase separation behaviors of biobased sugar–terpenoid hybrid block co-oligomers (BCOs) with different molecular parameters, including their volume fractions, the linker structures between the blocks, and the stereochemistries of the terpenoid blocks. The BCOs were synthesized using the azido–alkyne click reaction of propargyl-β-d-glucopyranoside with azido-functionalized farnesol, phytol, DL-α-tocopherol, and d-α-tocopherol, to ensure a well-defined molecular structure without any molecular weight distribution. Through X-ray scattering screening, we found that tocopherols, when combined with a glucose unit, yield BCOs capable of forming gyroid and hexagonally perforated lamellar (HPL) 3D network morphologies with ultrasmall domain spacings of ∼10 nm. Remarkably, HPL, which is known as a metastable phase in block copolymers, was obtained in both the bulk and film states. The nature of the linker structure and the stereochemistry of the tocopherol hydrocarbon chain were found to influence the resulting morphology and the long-range order of the nanostructures. We expect this study to contribute to the molecular design of precise block copolymers and the construction of intricate nanostructural templates with ultrasmall feature sizes. Materials science ; Copolymer ; Nanostructure ; Lamellar structure ; Crystallography ; Nanotechnology ; Polymer chemistry ; Polymer ; Chemistry ; Composite material Block Copolymer Self-Assembly ; Advanced Polymer Synthesis and Characterization ; Polymer composites and self-healing
Authors: Anne Saumer | Stefan Mecking
Source: ACS Sustainable Chemistry & Engineering (article, 2023-08-09)
Field: Materials Science — Biomaterials

Recyclable and Degradable Ionic-Substituted Long-Chain Polyesters Ionic groups can endow apolar polymers like polyethylene with desirable traits like adhesion with polar compounds. While ethylene copolymers provide a wide range of tunability <i>via</i> the carboxylate content and neutralization with different cations, they lack degradability or suitability for chemical recycling due to their all-carbon backbones. Here, we report ion-containing long-chain polyesters with low amounts of ionic groups (<i>M</i><sub>n</sub> = 50-60 kg/mol, <0.5 mol % of ionic monomers) which can be synthesized from plant oils and exhibit HDPE-like character in their structural and mechanical properties. In the sulfonic acid as well as neutralized sulfonate-containing polyesters, the nature of the cation counterions (Mg<sup>2+</sup>, Ca<sup>2+</sup>, and Zn<sup>2+</sup>) significantly impacts the mechanical properties and melt rheology. Acid-containing polyesters exhibit a relatively high capability to absorb water and are susceptible to abiotic degradation. Enhanced surface wettability is reflected by facilitation of printing on films of these polymers. Depolymerization by methanolysis to afford the neat long-chain monomers demonstrates the suitability for chemical recycling. The surface properties of the neutralized sulfonate-containing polyesters are enhanced, showing a higher adsorption capability. Our findings allow for tuning the properties of recyclable polyethylene-like polymers and widen the scope of these promising materials. Polyester ; Chain (unit) ; Chemistry ; Ionic bonding ; Ionic liquid ; Organic chemistry ; Polymer chemistry ; Chemical engineering ; Polymer science ; Combinatorial chemistry ; Catalysis ; Ion ; Engineering biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Polymer composites and self-healing
Authors: MAHESHWARI KARANAM | LAKSHMIDEVI GOTTEMUKKULA
Source: Asian Journal of Pharmaceutical and Clinical Research (review, 2023-04-07)
Field: Materials Science — Biomaterials

A REVIEW OF NANOGELS AS NOVEL DRUG DELIVERY SYSTEMS The term “nanogel” refers to highly cross-linked hydrogels with a size between 20 and 200 nm. Due to their tiny size, they have higher penetration and greater drug-loading capacity. They release the medication using mechanisms such as photochemical internalization, volume transition, pH responsiveness, thermo sensitive, and photo isomerization. They can be categorized according to whether they respond to stimuli or not as well as the kind of links that are present in the gel structure’s network chains. Using photolithography, modified pollutants, and emulsions, one can create nanogel. Reverse microemulsion polymerization, inverse mini-emulsion polymerization, and the free radical cross-linking polymerization method are all examples of polymerization. Cancer, diabetes, inflammation, and bone regeneration are just a few conditions that can be treated with nanogels. The cutting-edge medication delivery technology for both hydrophilic and hydrophobic drugs is nanogels. This article focuses on the historical data regarding herbal nanogels, which have high patient compliance, delivery rate, and efficacy when used to treat various illnesses. The topic of stimulus-responsive nanogels, including pH-and temperature-responsive systems, is also covered. Nanogel ; Polymerization ; Drug delivery ; Microemulsion ; Materials science ; Self-healing hydrogels ; Emulsion polymerization ; Radical polymerization ; Nanotechnology ; Internalization ; Chemistry ; Chemical engineering ; Polymer ; Polymer chemistry ; Organic chemistry ; Pulmonary surfactant Nanoparticle-Based Drug Delivery ; Advanced Drug Delivery Systems ; Hydrogels: synthesis, properties, applications
Authors: Xiaxuan Ran | Yunzhuo Qu | Yijie Wang | Bowen Cui | Yushan Shen | Yuanzhe Li
Source: Preprints.org (preprint, 2023-09-12)
Field: Materials Science — Biomaterials

Enhanced UV-blocking Capabilities of Polylactic Acid Derived from Renewable Resources for Food and Drug Packaging: A Mini-Review Plastic materials have revolutionized modern life, particularly in the domain of food packaging, owing to their versatility, lightweight nature, and ease of processing. However, the environmental ramifications of non-degradable plastics have raised concerns. Polylactic acid (PLA), derived from renewable sources, presents a sustainable alternative due to its biodegradability and exceptional barrier, mechanical, and safety properties. Nevertheless, the high UV transmittance of PLA limits its use for photosensitive food and pharmaceutical packaging, where UV radiation can lead to nutritional loss and spoilage. Various methods have been explored to enhance the UV-blocking capabilities of PLA, including the integration of inorganic nanoparticles and surface coatings. Despite advancements, these approaches often compromise the inherent transparency of PLA. Incorporating large conjugated groups can maintain transparency but introduces additional challenges. This paper reviews modification methods to enhance PLA&amp;#039;s UV-barrier properties and anticipates its expanded utility in food and drug packaging, promoting UV resistance and diversifying PLA&amp;#039;s applications. Polylactic acid ; Food packaging ; Transparency (behavior) ; Materials science ; Nanotechnology ; Biochemical engineering ; Chemistry ; Polymer ; Computer science ; Food science ; Composite material ; Engineering biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Additive Manufacturing and 3D Printing Technologies
Authors: Felix Geist | Sebastián Martínez | Jacqueline Ramler | Kai Oberdorf | Lisa Brändler | Sascha Reith | Crispin Lichtenberg
Source: European Journal of Inorganic Chemistry (article, 2023-08-02)
Field: Chemistry — Organic Chemistry

A Dibismuthane with Olefin Functional Groups: Towards Tridentate Hybrid Chalcogen/Olefin Ligands Abstract Bis[dibenzobismepine], a dibismuthane composed of two bismepine units (R 2 Bi−BiR 2 ), was synthesized and fully characterized (R 2 =(C 6 H 4 CH) 2 ). Reactions of this dibismuthane with diphenyl dichalcogenides, dibenzoylperoxide, and elemental chalcogens have been investigated. All products of these reactions have been isolated and fully characterized, including a series of compounds R 2 Bi−E−BiR 2 (E=O−Te). These species contain two olefin units of the bismepine moieties and a chalcogen atom as potential coordination sites. The potential of these species to act as hybrid tridentate chalcogen/olefin ligands with bismuth atoms as structure‐determining elements in the backbone has been investigated by theoretical approaches, aiming at the complexation of Co I , Rh I , Ir I and Ni 0 , Pd 0 , Pt 0 . The analytical techniques applied in this work include heteronuclear and 2D NMR spectroscopy, elemental analysis, single‐crystal X‐ray diffraction analysis, and DFT calculations. Chalcogen ; Chemistry ; Olefin fiber ; Heteronuclear molecule ; Bismuth ; Crystallography ; Elemental analysis ; Density functional theory ; Crystal structure ; Nuclear magnetic resonance spectroscopy ; Stereochemistry ; Inorganic chemistry ; Computational chemistry ; Organic chemistry ; Catalysis Organometallic Compounds Synthesis and Characterization ; Synthesis and characterization of novel inorganic/organometallic compounds ; Organometallic Complex Synthesis and Catalysis
Authors: Noelia Esteban | Miguel Claros | Cristina Álvarez | Ángel E. Lozano | Camino Bartolomé | Jesús M. Martínez‐Ilarduya | Jesús A. Miguel
Source: Polymers (article, 2023-10-19)
Field: Materials Science — Materials Chemistry

Palladium Catalysts Supported in Microporous Phosphine Polymer Networks A new set of microporous organic polymers (POPs) containing diphosphine derivatives synthesized by knitting via Friedel-Crafts has been attained. These amorphous three-dimensional materials have been prepared by utilizing diphosphines, 1,3,5-triphenylbenzene, and biphenyl as nucleophile aromatic groups, dimethoxymethane as the electrophilic linker, and FeCl<sub>3</sub> as a promoting catalyst. These polymer networks display moderate thermal stability and high microporosity, boasting BET surface areas above 760 m<sup>2</sup>/g. They are capable of coordinating with palladium acetate, using the phosphine derivative as an anchoring center, and have proven to be highly efficient catalysts in Suzuki-Miyaura coupling reactions involving bromo- and chloroarenes under environmentally friendly (using water and ethanol as solvents) and aerobic conditions. These supported catalysts have achieved excellent turnover numbers (TON) and turnover frequencies (TOF), while maintaining good recyclability without significant loss of activity or Pd leaching after five consecutive reaction cycles. Catalysis ; Palladium ; Conjugated microporous polymer ; Phosphine ; Biphenyl ; Microporous material ; Thermal stability ; Organic chemistry ; Polymer chemistry ; Turnover number ; Chemistry ; Materials science Covalent Organic Framework Applications ; Metal-Organic Frameworks: Synthesis and Applications ; Chemical Synthesis and Reactions
Authors: Huan Yang | Ivan Abilio | Juan Bernal Romero | Carlos Rodriguez | Miguel Escobar Godoy | Mitchell Little | Patrick A. McKee | Vanessa Carbajal | Joey H. Li | Xing Chen | Hongjun Gao | Krisztián Palotás | Li Gao
Source: Journal of Physics Condensed Matter (article, 2023-06-27)
Field: Materials Science — Materials Chemistry

Atomic-scale identification of nitrogen dopants in graphene on Ir(111) and Ru(0001) Nitrogen (N) doped graphene materials have been synthesized using the sole precursor adenine on the Ir(111) and Ru(0001) surfaces. X-ray photoelectron spectroscopy and scanning tunneling microscopy (STM) have been used to characterize the obtained N-doped graphene materials. Several graphitic and pyridinic N dopants have been identified on the atomic scale by combining STM measurements and STM simulations based on density functional theory calculations. Graphene ; Scanning tunneling microscope ; Dopant ; X-ray photoelectron spectroscopy ; Density functional theory ; Materials science ; Nitrogen ; Scanning tunneling spectroscopy ; Doping ; Atomic units ; Nanotechnology ; Analytical Chemistry (journal) ; Chemistry ; Computational chemistry ; Chemical engineering ; Optoelectronics ; Physics ; Organic chemistry Graphene research and applications ; Molecular Junctions and Nanostructures ; Advancements in Battery Materials
Authors: Fatih Yanar | Harriet Kimpton | Domenico A. Cristaldi | Ali Mosayyebi | Dario Carugo | Xunli Zhang
Source: Materials Research Express (article, 2023-08-01)
Field: Materials Science — Biomaterials

Synthesis and characterization of liposomes encapsulating silver nanoprisms obtained by millifluidic-based production for drug delivery Abstract Silver nanoprisms (SNPs) have attracted significant attention due to their surface plasmon resonance behaviour, which is strongly dependent on their size and shape. The enhanced light absorption and scattering capacity of SNPs, make them a promising candidate system for non-invasive imaging and drug delivery in nanoparticle-assisted diagnostics and therapy. However, systemic administration of silver nanoparticles (AgNPs) at high concentrations may result in toxic side-effects, arising from non-targeted bio-distribution. These drawbacks could be mitigated by employing liposomes as carriers for AgNPs. However, there is a lack of systematic studies on production and subsequent physico-chemical characterisation of liposomal systems encapsulating SNPs. The present study therefore investigated the synthesis of liposomes encapsulating SNPs (Lipo/SNPs) using a continuous-flow millimetre-scale reactor, whereby liposome formation was governed by a solvent exchange mechanism. An aqueous phase and an ethanolic lipid phase were conveyed through two separate inlet channels, and subsequently travelled through a serpentine-shaped channel where mixing between the two phases took place. The synthesis process was optimised by varying both liposome formulation and the operating fluidic parameters, including the ratio between inlet flow rates (or flow rate ratio) and the total flow rate. The obtained Lipo/SNPs were characterised for their size and electrostatic charge, using a dynamic light scattering apparatus. Liposome morphology and encapsulation efficiency of SNPs within liposomes were determined by transmission electron microscopy (TEM) imaging. The synthesised negatively charged Lipo/SNP samples were found to have an average size of ∼150 nm (size dispersity &lt; 0.3). The AgNPs encapsulation efficiency was equal to 77.48%, with mostly single SNPs encapsulated in liposomes. By using a multiangle TEM imaging approach, quasi-3D images were obtained, further confirming the encapsulation of nanoparticles within liposomes. Overall, the formulation and production technique developed in the present study has potential to contribute towards mitigating challenges associated with AgNP-mediated drug delivery and diagnostics. Dispersity ; Liposome ; Dynamic light scattering ; Drug delivery ; Volumetric flow rate ; Microfluidics ; Materials science ; Particle size ; Nanoparticle ; Nanotechnology ; Chemistry ; Silver nanoparticle ; Chemical engineering ; Analytical Chemistry (journal) ; Chromatography ; Polymer chemistry Nanoparticle-Based Drug Delivery ; Gold and Silver Nanoparticles Synthesis and Applications ; Innovative Microfluidic and Catalytic Techniques Innovation