jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Valéria Gomes | Sérgio R. S. Veloso | Miguel A. Correa‐Duarte | Paula M. T. Ferreira | Elisabete M. S. Castanheira
Source: International Journal of Molecular Sciences (review, 2022-12-22)
Field: Materials Science — Biomaterials

Tuning Peptide-Based Hydrogels: Co-Assembly with Composites Driving the Highway to Technological Applications Self-assembled peptide-based gels provide several advantages for technological applications. Recently, the co-assembly of gelators has been a strategy to modulate and tune gel properties and even implement stimuli-responsiveness. However, it still comprises limitations regarding the required library of compounds and outcoming properties. Hence, efforts have been made to combine peptide-based gels and (in)organic composites (e.g., magnetic nanoparticles, metal nanoparticles, liposomes, graphene, silica, clay, titanium dioxide, cadmium sulfide) to endow stimuli-responsive materials and achieve suitable properties in several fields ranging from optoelectronics to biomedical. Herein, we discuss the recent developments with composite peptide-based gels including the fabrication, tunability of gels' properties, and challenges on (bio)technological applications. Self-healing hydrogels ; Nanotechnology ; Materials science ; Nanoparticle ; Cadmium sulfide ; Fabrication ; Peptide ; Nanomaterials ; Composite number ; Graphene ; Titanium dioxide ; Composite material ; Chemistry ; Metallurgy ; Polymer chemistry Supramolecular Self-Assembly in Materials ; Photochromic and Fluorescence Chemistry ; Chemical Synthesis and Analysis
Authors: Darren Makeiff | Jae‐Young Cho | Bradley D. Smith | Rina Carlini | Nicolas Godbert
Source: Gels (article, 2022-05-05)
Field: Materials Science — Biomaterials

Self-Assembly of Alkylamido Isophthalic Acids toward the Design of a Supergelator: Phase-Selective Gelation and Dye Adsorption A new series of 5-alkylamido isophthalic acid (ISA) derivatives with varying single and twin alkyl chain lengths were designed and synthesized as potential supramolecular organogelators. 5-alkylamido ISAs with linear or branched alkyl tail-groups of different lengths were effective gelators for low polarity solvents. In particular, among the presented series, a derivative with a branched, 24 carbon atom tail-group behaves as a "supergelator" with up to twenty organic solvents forming gels that are highly stable over time. The gelation behavior was analyzed using Hansen solubility parameters, and the thermal stability and viscoelastic properties of select gels were characterized. Microscopy, spectroscopy, powder X-ray diffraction, and computer modeling studies were consistent with a hierarchical self-assembly process involving the formation of cyclic H-bonded hexamers via the ISA carboxylic acid groups, which stack into elementary fibers stabilized by H-bonding of the amide linker groups and π-π stacking of the aromatic groups. These new nanomaterials exhibited potential for the phase-selective gelation of oil from oil-water mixtures and dye uptake from contaminated water. The work expands upon the design and synthesis of supramolecular self-assembled nanomaterials and their application in water purification/remediation. Isophthalic acid ; Alkyl ; Supramolecular chemistry ; Stacking ; Materials science ; Thermal stability ; Amide ; Solubility ; Nanomaterials ; Self-assembly ; Phase (matter) ; Chemical engineering ; Polymer chemistry ; Chemistry ; Organic chemistry ; Polyester ; Nanotechnology ; Molecule ; Terephthalic acid Supramolecular Self-Assembly in Materials ; Polydiacetylene-based materials and applications ; Lipid Membrane Structure and Behavior
Authors: Shao-Yu Lo | Carlton P. Folster | Robin P. Harkins | Ryan J. Anderson | Yu‐Ling Lien | Hsin‐Chun Chiu | Alex E. Carpenter | Ian A. Tonks
Source: ACS Catalysis (article, 2022-11-15)
Field: Chemistry — Organic Chemistry

Carbonylative Co- and Terpolymerizations of 10-Undecen-1-ol: A Route to Polyketoesters with Tunable Compositions A strategy to synthesize branched polyketoesters from the carbonylative polymerization of bifunctional α,ω-alkenols such as 10-undecen-1-ol is presented. This strategy hinges on the competitive application of two related catalytic manifolds, alternating alkene/CO copolymerization, and alkene hydroesterification, which share a common metal acyl intermediate. Small molecule model studies of cationic Pd-catalyzed alkene carbonylation in the presence of alcohols demonstrate that the relative rates of ketone formation (through alternating alkene/CO insertion) and ester formation (through metal acyl alcoholysis) can be tuned across a wide range through judicious bis(phosphine) ligand design. Carbonylative polymerization of 10-undecen-1-ol with a (dppp(3,5-CF3)4)Pd(OTs)2 catalyst (dppp(3,5-CF3)4 = 1,3-bis[bis[3,5-bis(trifluoromethyl)phenyl]-phosphino]propane) led to the formation of high molecular weight polyketoesters with intermediate dispersity (Mn > 20,000 g/mol, D̵ = 2.6) and a ketone/ester microstructure ratio of approximately 1:2. In these polymerization reactions, deploying electron-deficient bis(phosphines) to suppress deleterious alkene isomerization was the key to accessing the high molecular weight polymer. Further, terpolymerization reactions of 1-hexene/10-undecen-1-ol/CO or 1-fluoro-10-undecene/10-undecen-1-ol/CO by (dppp(3,5-CF3)4)Pd(OTs)2 were also successful. This proof of concept polymerization unlocks access to tunable polymer microstructures without extensive postpolymerization treatment. Alkene ; Chemistry ; Polymerization ; Cationic polymerization ; Carbonylation ; Bifunctional ; Polymer chemistry ; Phosphine ; Ketone ; Catalysis ; Living polymerization ; Organic chemistry ; Polymer ; Radical polymerization ; Carbon monoxide Organometallic Complex Synthesis and Catalysis ; Carbon dioxide utilization in catalysis ; Asymmetric Hydrogenation and Catalysis
Authors: Kavon D. Mojtabai | Samantha J. Knight | Brandon McReynolds | Nicole Penners | John D. McCoy | Sanchari Chowdhury | Youngmin Lee
Source: ACS Applied Polymer Materials (article, 2022-03-17)
Field: Materials Science — Polymers and Plastics

Diels–Alder Augmented Epoxies with Plasmonic Nanoparticle Fillers for Efficient Photothermal Depolymerization Thermally reversible epoxies through the Diels–Alder (DA) reaction have been used for applications such as recycling, self-healing, and 3D printing. Depolymerization by bulk heating, however, would be a slow and inefficient process due to its low thermal conductivity. In this paper, photothermal conversion using refractory plasmonic titanium nitride (TiN) nanoparticles was employed for efficient and rapid depolymerization of reversible epoxies. TiN nanoparticles have superior thermal stability, broader light absorption, and higher light-to-heat conversion efficiency. They are also less expensive than more common plasmonic gold nanoparticles. Photothermal behavior of TiN nanoparticle-filled reversible epoxies was investigated as a function of concentration of TiN nanoparticles and as a function of the intensity of a light source. TiN nanoparticles could induce sufficient heat for depolymerization with a trace content, 0.01% by weight, under a broad-spectrum white light of intensity 1760 mW/cm2 instead of a strong light source such as a laser. The reversible epoxies were prepared by a reaction between furan precursors and a bismaleimide compound. Crosslinking density was controlled by altering the architecture of furan precursors and the feed ratio between the furan precursor and the bismaleimide compound. These changes in chemical structure and degree of crosslinking permit the control of the thermomechanical properties of the reversible epoxy from soft elastomers to hard elastomers. The reversible epoxies display a flow region at around 110 °C. Depolymerization through the retro-DA was confirmed by Fourier transform infrared spectroscopy as a function of duration at a high temperature. Light-induced removability and recyclability were demonstrated by adhesion tests using the reversible epoxy/nanoparticle composites. Materials science ; Photothermal therapy ; Depolymerization ; Tin ; Nanoparticle ; Chemical engineering ; Photothermal effect ; Plasmonic nanoparticles ; Composite material ; Polymer chemistry ; Nanotechnology ; Metallurgy Polymer composites and self-healing ; Electrospun Nanofibers in Biomedical Applications ; Polydiacetylene-based materials and applications
Authors: Ali Fatemi | Tavakkol Tohidi | Kazem Jamshidi-Galeh | Milad Rasouli | Kostya Ostrikov
Source: Scientific Reports (article, 2022-07-28)
Field: Materials Science — Materials Chemistry

RETRACTED ARTICLE: Optical and structural properties of Sn and Ag-doped PbS/PVA nanocomposites synthesized by chemical bath deposition In this work, Sn and Ag doped PbS/PVA nanocomposites, in three different concentrations were successfully prepared using the low-cost and simple method of chemical bath deposition (CBD). X-ray diffraction patterns confirmed the formation of the PbS cubic phase in all of the nanocomposites. FE-SEM images showed that PbS NPs are cubic in shape and the doping can alter the shape of grains. DLS analysis applied for solution NPs exhibited a 175 nm size distribution for PbS NPs and decreased by doping Ag and Sn to almost 100 nm and 110 nm, respectively. Optical absorption spectra showed the blue phenomena and the band gaps of Sn: PbS/PVA and Ag: PbS/PVA nanocomposites increased with adding Sn and Ag from 3.08 eV for pure PVA/PbS to 3.33 eV for Sn doped and 3.43 eV for Ag-doped samples. The nonlinear refractive index is decreased from 0.55 m<sup>2</sup> W<sup>-1</sup> for pure PVA/PbS to 0.11 m<sup>2</sup> W<sup>-1</sup> and 0.13 m<sup>2</sup> W<sup>-1</sup> for Sn and Ag-doped samples, respectively. Hence, doping Ag and Sn enhanced the optical sensitivity issue of nanocomposites and raised the optical resistivity. Collectively, our results can be useful in the design of linear and nonlinear optical devices such as sensors and optical switches and limiters. Chemical bath deposition ; Nanocomposite ; Doping ; Materials science ; Band gap ; Analytical Chemistry (journal) ; Refractive index ; Chemical engineering ; Nanotechnology ; Thin film ; Nuclear chemistry ; Optoelectronics ; Chemistry ; Chromatography Quantum Dots Synthesis And Properties ; Nonlinear Optical Materials Studies ; Polymer Nanocomposite Synthesis and Irradiation
Authors: Jian‐Hong Tang | Yu‐Wu Zhong
Source: Inorganics (article, 2022-06-22)
Field: Chemistry — Inorganic Chemistry

Anthracene-Containing Metallacycles and Metallacages: Structures, Properties, and Applications Due to its highly conjugated panel-like structure and unique photophysical and chemical features, anthracene has been widely used for fabricating attractive and functional supramolecular assemblies, including two-dimensional metallacycles and three-dimensional metallacages. The embedded anthracenes in these assemblies often show synergistic effects on enhancing the desired supramolecular and luminescent properties. This review focuses on the metallasupramolecular architectures with anthracene-containing building blocks, as well as their applications in host-guest chemistry, stimulus response, molecular sensing, light harvesting, and biomedical science. Anthracene ; Supramolecular chemistry ; Nanotechnology ; Luminescence ; Conjugated system ; Materials science ; Chemistry ; Photochemistry ; Molecule ; Optoelectronics ; Polymer ; Organic chemistry Metal-Organic Frameworks: Synthesis and Applications ; Supramolecular Chemistry and Complexes ; Molecular Sensors and Ion Detection
Authors: Sumeer R. Khanna | Michael G. Stanford | Ivan Vlassiouk | Philip D. Rack
Source: Nanomaterials (article, 2022-05-04)
Field: Materials Science — Materials Chemistry

Combinatorial Cu-Ni Alloy Thin-Film Catalysts for Layer Number Control in Chemical Vapor-Deposited Graphene We synthesized a combinatorial library of CuxNi1−x alloy thin films via co-sputtering from Cu and Ni targets to catalyze graphene chemical vapor deposition. The alloy morphology, composition, and microstructure were characterized via scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), and X-ray diffraction (XRD), respectively. Subsequently, the CuxNi1−x alloy thin films were used to grow graphene in a CH4-Ar-H2 ambient at atmospheric pressure. The underlying rationale is to adjust the CuxNi1−x composition to control the graphene. Energy dispersive x-ray spectroscopy (EDS) analysis revealed that a continuous gradient of CuxNi1−x (25 at. % < x < 83 at.%) was initially achieved across the 100 mm diameter substrate (~0.9%/mm composition gradient). The XRD spectra confirmed a solid solution was realized and the face-centered cubic lattice parameter varied from ~3.52 to 3.58 A˙, consistent with the measured composition gradient, assuming Vegard’s law. Optical microscopy and Raman analysis of the graphene layers suggest single layer growth occurs with x > 69 at.%, bilayer growth dominates from 48 at.% < x < 69 at.%, and multilayer (≥3) growth occurs for x < 48 at.%, where x is the Cu concentration. Finally, a large area of bi-layer graphene was grown via a CuxNi1−x catalyst with optimized catalyst composition and growth temperature. Graphene ; Materials science ; Raman spectroscopy ; Thin film ; Chemical vapor deposition ; Alloy ; Analytical Chemistry (journal) ; Scanning electron microscope ; Microstructure ; Substrate (aquarium) ; Chemical engineering ; Nanotechnology ; Composite material ; Chemistry ; Optics ; Organic chemistry Graphene research and applications ; Advancements in Battery Materials ; Nanomaterials for catalytic reactions
Authors: Paula Escamilla | Walter D. Guerra | Antonio Leyva‐Pérez | Donatella Armentano | Jesús Ferrando‐Soria | Emilio Pardo
Source: Chemical Communications (review, 2022-12-15)
Field: Chemistry — Inorganic Chemistry

Metal–organic frameworks as chemical nanoreactors for the preparation of catalytically active metal compounds Since the emergence of metal-organic frameworks (MOFs), a myriad of thrilling properties and applications, in a wide range of fields, have been reported for these materials, which mainly arise from their porous nature and rich host-guest chemistry. However, other important features of MOFs that offer great potential rewards have been only barely explored. For instance, despite the fact that MOFs are suitable candidates to be used as chemical nanoreactors for the preparation, stabilization and characterization of unique functional species, that would be hardly accessible outside the functional constrained space offered by MOF channels, only very few examples have been reported so far. In particular, we outline in this feature recent advances in the use of highly robust and crystalline oxamato- and oxamidato-based MOFs as reactors for the <i>in situ</i> preparation of well-defined catalytically active single atom catalysts (SACS), subnanometer metal nanoclusters (SNMCs) and supramolecular coordination complexes (SCCs). The robustness of selected MOFs permits the post-synthetic (PS) <i>in situ</i> preparation of the desired catalytically active metal species, which can be characterised by single-crystal X-ray diffraction (SC-XRD) taking advantage of its high crystallinity. The strategy highlighted here permits the always challenging large-scale preparation of stable and well-defined SACs, SNMCs and SCCs, exhibiting outstanding catalytic activities. Nanoreactor ; Metal-organic framework ; Nanotechnology ; Nanoclusters ; Supramolecular chemistry ; Materials science ; Catalysis ; Polyoxometalate ; Metal ; Characterization (materials science) ; Crystallinity ; Combinatorial chemistry ; Chemistry ; Crystal structure ; Nanoparticle ; Organic chemistry ; Adsorption Metal-Organic Frameworks: Synthesis and Applications ; Nanocluster Synthesis and Applications ; Metal complexes synthesis and properties
Authors: Faranak Pooladian | Samira Escopy | Alexei V. Demchenko
Source: Molecules (article, 2022-10-29)
Field: Chemistry — Organic Chemistry

Activation of Thioglycosides with Copper(II) Bromide Reported herein is a new protocol for glycosidation of alkyl and aryl thioglycosides in the presence of copper(II) bromide. While the activation with CuBr<sub>2</sub> alone was proven suitable for reactive glycosyl donors, the activation of less reactive donors was more efficient in the presence of triflic acid as an additive. A variety of thioglycoside donors in reactions with different glycosyl acceptors were investigated to determine the initial scope of this reaction. Chemistry ; Glycosyl ; Bromide ; Triflic acid ; Combinatorial chemistry ; Aryl ; Copper ; Alkyl ; Organic chemistry ; Medicinal chemistry ; Catalysis Carbohydrate Chemistry and Synthesis ; Glycosylation and Glycoproteins Research ; Polyamine Metabolism and Applications
Authors: Meina Zhang | Jasmine Lidder | Mounib Bahri | Haifei Zhang
Source: Pharmaceutics (article, 2022-11-30)
Field: Materials Science — Biomaterials

Preparation of PLGA-Coated Porous Silica Nanofibers for Drug Release Fibrous materials have unique applications in drug release and biomedical fields. This study reports on the preparation of porous silica nanofibers, using organic nanofibers as templates, and their use for drug release. Different from the commonly used electrospinning method, the organic nanofibers are produced via a self-assembly approach between melamine and benzene-1,3,5-tricarboxylic acid. Silica is then coated on the organic nanofibers via homogenization in a silica sol, a freeze-drying process, and then a sol-gel process. In order to regulate the surface area and mesopore volume of silica nanofibers, cetyltrimethyl ammonium bromide at different concentrations is used as template in the sol-gel process. With the removal of organic nanofibers and the surfactant by calcination, porous silica nanofibers are generated and then assessed as a scaffold for controlled drug release with ketoprofen as a model drug. Poly (D, L-lactide-co-glycolide) is coated on the silica nanofibers to achieve slow burst release and prolonged cumulative release of 25 days. This study demonstrates an effective method of preparing hollow silica nanofibers and the use of such nanofibers for long-term release with high drug loading. Nanofiber ; Materials science ; Electrospinning ; Chemical engineering ; Porosity ; Mesoporous silica ; Calcination ; Polyaniline nanofibers ; Mesoporous material ; Nanotechnology ; Organic chemistry ; Chemistry ; Composite material ; Polymer ; Catalysis ; Polymerization Electrospun Nanofibers in Biomedical Applications ; biodegradable polymer synthesis and properties ; Silicone and Siloxane Chemistry
Authors: Fengdi Li | Giao Nguyen | Cédric Vancaeyzeele | Frédéric Vidal | Cédric Plesse
Source: Gels (article, 2022-06-15)
Field: Materials Science — Polymers and Plastics

Photopolymerizable Ionogel with Healable Properties Based on Dioxaborolane Vitrimer Chemistry Ionogels are solid polymer gel networks loaded with ionic liquid (IL) percolating throughout each other, giving rise to ionically conducting solid electrolytes. They combine the mechanical properties of polymer networks with the ionic conductivity, non-volatility, and non-flammability of ILs. In the frame of their applications in electrochemical-based flexible electronics, ionogels are usually subjected to repeated deformation, making them susceptible to damage. It appears critical to devise a simple and effective strategy to improve their durability and lifespan by imparting them with healing ability through vitrimer chemistry. In this work, we report the original in situ synthesis of polythioether (PTE)-based vitrimer ionogels using fast photopolymerization through thiol-acrylate Michael addition. PTE-based vitrimer was prepared with a constant amount of the trithiol crosslinker and varied proportions of static dithiol spacers and dynamic chain extender BDB containing dynamic exchangeable boronic ester groups. The dynamic ionogels were prepared using 50 wt% of either 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide or 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate, both of which were selected for their high ionic conductivity. They are completely amorphous (<i>T<sub>g</sub></i> below -30 °C), suggesting they can be used at low temperatures. They are stretchable with an elongation at break around 60%, soft with Young's modulus between 0.4 and 0.6 MPa, and they have high ionic conductivities for solid state electrolytes in the order of 10<sup>-4</sup> S·cm<sup>-1</sup> at room temperature. They display dynamic properties typical of the vitrimer network, such as stress relaxation and healing, retained despite the large quantity of IL. The design concept illustrated in this work further enlarges the library of vitrimer ionogels and could potentially open a new path for the development of more sustainable, flexible electrochemical-based electronics with extended service life through repair or reprocessing. Ionic liquid ; Materials science ; Ionic conductivity ; Ionic bonding ; Trimethylolpropane ; Polymer ; Electrolyte ; Dynamic mechanical analysis ; Chemical engineering ; Polymer chemistry ; Composite material ; Chemistry ; Organic chemistry ; Ion ; Physical chemistry ; Polyurethane ; Electrode Polymer composites and self-healing ; Conducting polymers and applications ; Polyoxometalates: Synthesis and Applications
Authors: Pavel A. Demakov | Alexey A. Ryadun | Vladimir P. Fedin
Source: Inorganics (article, 2022-10-01)
Field: Chemistry — Inorganic Chemistry

Aliphatic-Bridged Early Lanthanide Metal–Organic Frameworks: Topological Polymorphism and Excitation-Dependent Luminescence Six new three-dimensional metal–organic frameworks based on early lanthanide(III) cations and trans-1,4-cyclohexanedicarboxylic acid (H2chdc) were obtained. Their crystal structures were determined by single-crystal X-ray diffraction analysis. The structure of [La2(H2O)4(chdc)3]·2DMF·H2O (1; DMF = N,N-dimethylformamide) contains one-dimensional infinite La(III)-carboxylate chains interconnected by cyclohexane moieties to form a highly porous polymeric lattice with 30% solvent accessible volume. Compounds [Ln2(phen)2(chdc)3]·0.75DMF (2Ln; Ln3+ = Ce3+, Pr3+, Nd3+ and Sm3+; phen = 1,10-phenanthroline) are based on binuclear carboxylate building blocks, which are decorated by chelate phenanthroline ligands and interconnected by cyclohexane moieties to form more dense isostructural coordination frameworks with primitive cubic pcu topology. Compound [Nd2(phen)2(chdc)3]·2DMF·0.67H2O (3) is based on secondary building units similar to 2Ln and contains a coordination lattice isomeric to 2Ln with a rare hexagonal helical snz topology. Thermal stability and luminescent properties were investigated. For 2Sm, a strong and nonmonotonous dependence of the luminescence color on the variation of excitation wavelength was revealed, changing its emission from pinkish red at λex = 340 nm to white at λex = 400 nm, and then to yellow at lower excitation energies. Such nonlinear behavior was rationalized in terms of the contribution of several different luminescence mechanisms. Thus, 2Sm is a rather rare example of a highly tunable monometallic lanthanide-based luminophore with possible applications in light-emitting devices and optical data processing. Lanthanide ; Luminescence ; Isostructural ; Crystallography ; Carboxylate ; Chemistry ; Phenanthroline ; Metal-organic framework ; Crystal structure ; Cyclohexane ; Topology (electrical circuits) ; Materials science ; Stereochemistry ; Physical chemistry ; Organic chemistry Metal-Organic Frameworks: Synthesis and Applications ; Lanthanide and Transition Metal Complexes ; Magnetism in coordination complexes