Abstract Exfoliation of expanded GO represents an attractive route to functionalized graphenes as versatile 2D carbon nanomaterials and components a wide variety polymer nanocomposites. Thermally reduced graphite oxides (TrGO) with specific surface areas 600 950 m 2 · g −1 were obtained by oxidation followed thermal expansion at °C. Thermal post treatment 700 °C 1 000 increased content (81 97 wt.‐%) lowered resistivity (1 50 Ω cm). During melt extrusion PC, iPP, SAN PA6, exfoliation afforded...

Poly(propylene) compounds containing organophilic layered nanosilicates were prepared by means of melt extrusion at 210°C in order to investigate the role silicate modification and compatibilizer addition on morphology development mechanical properties. Synthetic sodium fluoromica was used as water swellable silicate, which rendered cation exchange with various protonated alkyl amines such butyl (C4), hexyl (C6), octyl (C8), dodecyl (C12), hexadecyl (C16), octadecyl (C18) amine. Interlayer...

Hybrids of silver particles 1 to 2 nm in size with highly branched amphiphilically modified polyethyleneimines adhere effectively polar substrates providing environmentally friendly antimicrobial coatings.

A new method for the preparation of single quantum dots (QDs) in silica spheres has been developed. The work involves an oil-in-water microemulsion system with cyclohexane as "oil" phase and Synperonic NP-5 surfactant. Reaction parameters such reactant concentrations, time, temperature were studied. resulted smooth nanoparticles good monodispersity high luminescence QDs center. Elucidating coating mechanism was attempted. Possible mechanisms include a transfer by ligand exchange...

Structural and optical properties of ZnO nanoparticles can be fine tuned by a novel variant milling performed at cryogenic temperatures. In this study intrinsic defect centers such as oxygen zinc vacancies are characterized using electron paramagnetic resonance (EPR) photoluminescence (PL) spectroscopy. Three different surface defects with $g$ factors were identified EPR for which the spectral intensities change upon decreasing crystal size. PL revealed linear correlation giving detailed...

Any labeling with multicolor markers can be affected by the autofluorescence of biological tissue due to UV or blue light excitation sources, results are fluorescence resonance energy transfer. In this work, we present novel IR-to-vis upconverting nanoparticles different rare earth metal dopants. With a single source 980 nm, four colors nanocrystals spectrally separated under multiplexing conditions. The particles were phase transferred into polar solvents means silica encapsulation and...

High capacitance (13.2 μA h cm⁻²) double layer hybrid supercapacitor consisting of reduced graphene oxide/Fe doped Li₄Ti₅O₁₂ (rGO/LTO) and graphite.

A correlation between morphology development and rheology of polystyrene nanocomposites based upon organophilic layered silicates (organoclay) such as fluoromicas was found a function the silicate modification. Organoclay obtained by means ion exchange clay with protonated amine-terminated polystyrenes molar mass Mn = 121 5 800 g/mol. Only when applying shear forces during melt compounding organoclay modified high (PS), individual platelets 1 nm diameter 600 length were obtained. Dispersions...

Nanocomposites of high density polyethylene (HDPE), linear low (LLDPE) and highly branched rubbers were prepared both by means melt compounding ethene homo- copolymerization in the presence layered silicates which rendered organophilic via ion exchange with various quaternary alkyl ammonium cations. In comparison to compounding, in-situ copolymerization, catalyzed MAO-activated zirconocene (MBI), nickel (DMN) palladium (DMPN) catalysts, proved more effective nanocomposite formation, as...

Intercalation and supramolecular assembly of layered inorganic compounds represents an attractive route to polyurethane nanocomposites (see Figure for a schematic representation). The authors used silicate, synthetic fluoromica, as the compound in this study. are reinforced by means anisotropic laminated nanoparticles consisting layers bonded together with polyurethane.

A multiply active antimicrobial network coating has been synthesized that contains nanophase‐separated poly(ethylene imine) units and hydroxyl groups in the surrounding matrix. Silver nanoparticles can easily be loaded into PEI phase of matrix separately modified with polyethylene glycol. The resulting is an silver ion release system (Figure bottom—TEM image) a contact‐killing microbe‐repelling surface top—AFM image).

Nanostructured materials are attracting increased interest and applications. Exciting perspectives may be offered by electrical insulation. Polymeric nanofilled find new and/or upgraded applications in the electronic industry, replacing conventional insulation to provide improved performances apparatus, as regards, e.g., reliability, environmental compatibility power rating. This paper shows that properties of nanocomposite insulating for DC applications, specifically space charge,...

Nanostructured thermoset blends of bisphenol A-type epoxy resin (ER) and amphiphilic poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO−PPO−PEO) triblock copolymers were successfully prepared. Two samples PEO−PPO−PEO copolymer with different ethylene oxide (EO) contents, denoted as EO30 30 wt % EO content EO80 80 content, used to form the self-organized varying compositions using 4,4'-methylenedianiline (MDA) curing agent. The phase behavior, crystallization,...

Stable chromium, molybdenum, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, and iridium metal nanoparticles (M-NPs) have been reproducibly obtained by facile, rapid (3 min), energy-saving 10 W microwave irradiation (MWI) under an argon atmosphere from their metal-carbonyl precursors [M(x)(CO)(y)] in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF(4)]). This MWI synthesis is compared to UV-photolytic (1000 W, 15 min) or conventional thermal...

Stable silver nanoparticles are obtained reproducibly by hydrogen reduction of different inorganic precursors from AgIX salts (X = BF4, PF6, OTf) dissolved in the ionic liquids BMim+BF4-, BMim+PF6-, BMim+OTf-, or BtMA+NTf2- [BMim+ n-butylmethylimidazolium, BtMA+ n-butyltrimethylammonium, NTf2 N(O2SCF3)2, and OTf O3SCF3] presence n-butylimidazole (Bim) as scavenger for HX acid byproduct with a narrow size distribution diameter range 2.8−26.1 nm, which increases linearly molecular volume...

Stable chromium, molybdenum and tungsten nanoparticles are obtained reproducibly by thermal or photolytic decomposition under argon from mononuclear metal carbonyl precursors M(CO)6 (M = Cr, Mo, W) suspended in the ionic liquids BMim+BF4−, BMim+OTf− BtMA+Tf2N− (BMim+ n-butyl-methyl-imidazolium, BtMA+ n-butyl-trimethyl-ammonium, Tf2N N(O2SCF3)2, OTf O3SCF3) with a very small uniform size of 1 to 1.5 nm BMim+BF4− which increases molecular volume liquid anion ∼100 [characterization transmission...

A detailed description is given of the preparation a polymer solar cell and its characterization. The can be prepared entirely in ambient atmosphere by solution processing without use vacuum coating steps, it operated with good operational stability under illumination (1000 W m(-2), AM1.5G, 72 ± 2 °C, 35 5% relative humidity) for 100 h 20% loss efficiency respect to initial performance. dark storability (darkness, 25 has been shown exceed six months notable efficiency. devices do not require...

Stable iron, ruthenium, and osmium nanoparticles are obtained reproducibly by thermal or photolytic decomposition under an argon atmosphere from Fe2(CO)9, Ru3(CO)12, Os3(CO)12, dissolved in the ionic liquid BMim+BF4−, with a very small uniform size for Ru Os of about 1.5−2.5 nm without any additional stabilizers capping molecules (characterization transmission electron microscopy (TEM), dynamic light scattering, diffraction (TED) analysis).

The use of both bioglass (BG) and β tricalcium phosphate (β-TCP) for bone replacement applications has been studied extensively due to the materials’ high biocompatibility ability resorb when implanted in body. 3D printing explored as a fast versatile technique fabrication porous scaffolds. This project investigates effects using different combinations composite BG β-TCP powder Porous printed scaffolds BG, β-TCP, 50/50 BG/β-TCP 70/30 compositions were subject variety characterization tests....

Osteoarthritis (OA) is a joint disease affecting millions of patients worldwide. During OA onset and progression, the articular cartilage destroyed, but underlying complex mechanisms remain unclear. Here, we uncover changes in thickness collagen fibers their composition at OA. For explants from knee joints patients, find that type I collagen-rich fibrocartilage-like tissue was formed macroscopically intact cartilage, distant lesions. Importantly, number thick (>100 nm) has decreased early...

The crystalline morphology of a relatively high molecular weight isotactic polypropylene (i-PP) (Mw = 18000 g/mol) with well-defined regio- and stereoirregularities is studied by means atomic force microscopy (AFM), wide-angle X-ray scattering (WAXS), small-angle (SAXS), light microscopy. This i-PP crystallizes under certain crystallization conditions nearly exclusively in the γ-modification. growth γ-phase often influenced initial α-phase, but also neat observable. formation can be related...