Materials Literature
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Large-amplitude oscillatory shear (LAOS) has been applied to a lamellar, microphase-separated, low molecular weight poly(styrene- b -isoprene) diblock copolymer melt to induce macroscopically aligned morphologies. Small-angle X-ray scattering and dynamic mechanical testing were performed to characterize the states of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Frequency EPR Spectroscopy of Large Metal Ion Clusters: From Zero Field Splitting to Quantum Tunneling of the MagnetizationAnne-Laure Barra, Louis-Claude Brunel, Dante Gatteschi, Luca Pardi, and Roberta SessoliView Author Information Laboratoire des Champs Magnetiques I…
The procedure of aggregate-free poly(vinyl chloride) (PVC) solutions for size-exclusion chromatography (SEC) at room temperature using tetrahydrofuran (THF) as the mobile phase is proposed. PVC was dissolved in 1,2,4-trichlorobenzene (TCB) at 130 or 140°C for 6 h, precipitated in methanol, filtrated, and dried. The pr…
Detonation-synthesized nanodiamonds (5 nm in diamenter, containing 10% O as defects) decompose violently when irradiated by pulsed Nd:YAG laser photons at 1064 nm. The irradiation shatters the diamond lattice via multiphoton excitation, yielding CO and CO2 in the gas phase and graphitic spheroidal nanoparticles on the…
Polyaniline (PANI) was doped with p-phenolsulfonic acid (PSA) or 5-sulfosalicylic acid (SSA). The PANI salts were blended with poly(N-vinyl-2-pyrrolidone), poly(N-methyl-N-vinylacetamide), poly(N,N-dimethylacrylamide), or poly(2-methyl-2-oxazoline) by solution casting from dimethyl sulfoxide. Blends containing up to 5…
Three generations of dendrimers with a fluorescent core were synthesized by attaching dendrons of the Fréchet type to a dihydropyrrolopyrroledione (DPP) molecule. Samples were prepared by spin-coating a toluene solution containing 2 × 10 -9 M of the dendrimers and 3 mg/mL polystyrene (MW 45 000) on a glass cover slip.…
The grafting of polymers having controlled molecular weight and narrow molecular weight distribution onto chitosan powder by the termination of living polymer cation with amino groups on chitosan powder was investigated in heterogeneous system. The amino groups of chitosan powder successfully reacted with living poly(…
Three structurally variant alkyl-substituted porphyrins [zinc(II) 2,3,7,8,12,13,17,18-octa- n -decylporphyrin 2, metal(II) meso -5,10,15,20-tetra- n -undecylporphyrin 3 (metal = cobalt, copper, palladium, and zinc), and zinc(II) meso -5,10,15,20-tetrakis(phenoxy- n -nonyl)porphyrin 4] exist as photoconductive insulato…
The mechanical properties of recycled low-density polyethylene/wood flour (LDPE/WF) composites are improved when a maleated triblock copolymer styrene–ethylene/butylene–styrene (SEBS–MA) is added as a compatibilizer. The composites' tensile strength reached a maximum level with 4 wt % SEBS–MA content. The compatibiliz…
Strontium clusters of size 2 to 20 atoms have been studied within the local density approximation using the ab-initio molecular dynamics method with a plane wave basis in which the s and p electron wavefunctions are well represented. The resulting low lying isomers are optimized using a full-potential linear muffin ti…
A newly developed class of paraffin-like organomagadiite intercalates, interlayered by primary, secondary, tertiary, and quaternary onium ions, has been used to form elastomeric polymer-layered silicate nanocomposites by in situ polymerization during the thermoset process. Depending on the nature of the onium ions, in…
A new building block is constructed with one pyridine and two kinetically inert complexed Pd(II) ions, for the controlled assembly of metallodendrimers following either a convergent or a divergent route. The double pincer ligand 8 was cyclopalladated with Pd[CH 3 CN] 4 (BF 4 ) 2 and subsequently converted into the neu…
The conductance of multiwalled carbon nanotubes (MWNTs) was found to be quantized. The experimental method involved measuring the conductance of nanotubes by replacing the tip of a scanning probe microscope with a nanotube fiber, which could be lowered into a liquid metal to establish a gentle electrical contact with…
AgBr microcrystals that have been treated with reducing agents to form small silver clusters on their surface have been examined with low-temperature optical and optically detected magnetic resonance methods. These investigations have indicated that these treatments produce two closely related Ag clusters that are spe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTXylanase-Catalyzed Synthesis of a Novel Polysaccharide Having a Glucose-Xylose Repeating Unit, a Cellulose-Xylan Hybrid PolymerMasaya Fujita, Shin-ichiro Shoda, and Shiro KobayashiView Author Information Department of Materials Chemistry Graduate School of Engineering…
The chemical processes involved in the reactions between novolac resins, furfuryl alcohol (FA), and hexamethylenetetramine (HMTA) have been studied by solid-state NMR spectroscopy. A highly cross-linked homogeneous network which incorporates both novolac and furan entities is formed. The initial reaction below 90 °C i…
Photoinduced expansion and contraction response in monolayers consisting of a poly(vinyl alcohol) derivative having an azobenzene (Az) side chain at the air−water interface was investigated in detail by surface potential measurements, Brewster angle microscopy (BAM), UV−visible absorption spectroscopy, and the macrosc…
The dehydrogenation of ethanol has been studied over a series of Cu/SiO 2 catalysts modified with alkaline-earth oxide (Cu−MO/SiO 2, M = Mg, Ca, Sr, and Ba). The additive effects of alkaline-earth oxides on copper catalysts were examined by X-ray diffraction, scanning electron microscopy, temperature-programmed reduct…
A thin plate or slab, prepared so that opposite faces have different surface stresses, will bend as a result of the stress difference. We have developed a classical molecular dynamics (MD) formulation where (similar in spirit to constant-pressure MD) the curvature of the slab enters as an additional dynamical degree o…
Kramers–Kronig analysis for parallel electron energy loss spectroscopy (PEELS) data is developed as a software package. When used with a JEOL 4000EX high-resolution transmission electron microscope (HRTEM) operating at 100 keV this allows us to obtain the dielectric function of relatively wide band gap materials with…