Materials Literature
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Diazonium reagents functionalize single-walled carbon nanotubes suspended in aqueous solution with high selectivity and enable manipulation according to electronic structure. For example, metallic species are shown to react to the near exclusion of semiconducting nanotubes under controlled conditions. Selectivity is d…
We report the crystal structure of rubidium peroxodicarbonate, which was synthesized by electrocrystallization at T=257 K, from laboratory X-ray powder diffraction data. The compound crystallizes in the monoclinic space group P2(1)/c with four formula units per unit cell and cell parameters of a=7.9129(1), b=10.5117(1…
ADVERTISEMENT RETURN TO ISSUEPREVAddition & Corre...Addition & CorrectionA Carbon Nanotube Cross Structure as a Nanoscale Quantum DeviceAlireza Nojeh, Gregory W. Lakatos, Shu Peng, Kyeongjae Cho, and R. Fabian W. PeaseCite this: Nano Letters 2003, 3, 10, 1469Publication Date (Web):September 11, 2003Publication History…
A close look at the definitions of “coercivity” reveals two distinct notions: one referring to the hysteresis loop for B vs H and the other to that of M vs H. These are confused in several books. The properties of the M vs H loop are often ascribed to the B vs H loop, giving rise to various misconceptions. In this not…
The kinetics of grain growth during thermally induced phase transitions between two block copolymer ordered phases have been determined by polarized optical microscopy (POM). Measurements were made on poly(styrene- b -isoprene) copolymers, f PS = 0.3−0.6, in solutions with dialkyl phthalates at polymer volume fraction…
We have studied magnetic properties of heavily Mn-doped [(In0.44Ga0.56)0.79Mn0.21]As thin films grown by low-temperature molecular-beam epitaxy on InP substrates. (InGaMn)As with high Mn content (21%) was obtained by decreasing the growth temperature to 190 °C. When the thickness of the [(In0.44Ga0.56)0.79Mn0.21]As la…
The ring-opening polymerization (ROP) of epsilon-caprolactone (CL) was carried out in toluene at 100 degrees C with n-propanol (nPrOH) in the presence of Bu(2)SnCl(2). It comes out that the molar mass of the polyester chains can be predicted from the initial monomer-to-alcohol molar ratio in accordance with a controll…
Light‐emitting diodes (LEDs) were fabricated using two europium complexes , differing only by the addition of tert ‐butyl groups around the β‐diketonate ligands (see Figure), blended into poly(2‐(6′‐cyano‐6′‐methyl‐heptyloxy)‐1,4‐phenylene) (CN‐PPP). The addition of tert ‐butyl groups results in CN‐PPP–Eu LEDs with in…
Symmetric and highly asymmetric polystyrene- block -polyisoprene- block -polystyrene (SIS triblock) copolymers were synthesized via sequential anionic polymerization using difunctional initiator, and symmetric and highly asymmetric polystyrene- block -polyisoprene (SI diblock) copolymers were also synthesized using mo…
Narrow distribution macrocyclic poly(9,9-dimethyl-2-vinylfluorene) (PDMVF) and the matching linear precursors with the same degree of polymerization (DP n from 12 to 145) were synthesized via anionic polymerization followed by the end-to-end coupling with 1,4-bis(bromomethyl)benzene (DBX) or 9,10-bis(chloromethyl)anth…
Low-temperature phosphorescence (LTP) decay measurements have been carried out in wild-type Escherichia coli alkaline phosphatase (AP), metal-depleted AP (apoAP), and terbium-substituted AP (TbAP) at 77, 4.2, and 1.2 K. Over this temperature range, Tb emission monitored at 542.4 nm decays with two apparent lifetime co…
Quasielastic light scattering measurements were performed in the nematic phase of mixtures consisting of the calamitic mesogen 8OCB doped with small concentrations of the bent-core molecule P-7PIMB. It was found that the regular part of the bend elastic constant decreases strongly with dopant concentration X. Close to…
The application of Raman spectroscopy to the study of the copper chloride minerals nantokite, eriochalcite and claringbullite has enabled the vibrational modes for the CuCl, CuOH and CuOH 2 to be determined.Nantokite is characterised by bands at 205 and 155 cm -1 attributed to the transverse and longitudinal optic vib…
An investigation was carried out on the effect of molecular architecture on the dynamics of multigraft (MG) copolymers of polyisoprene (PI) and polystyrene (PS). MG copolymers with regularly spaced multiple grafts with trifunctional (combs), tetrafunctional (centipedes), and hexafunctional (barbwires) branch points we…
Biomimetics is seen as a path from biology to engineering. The only path from engineering to biology in current use is the application of engineering concepts and models to biological systems. However, there is another pathway: the verification of biological mechanisms by manufacture, leading to an iterative process b…
Low-molecular-weight poly(ethylene oxide) (PEO) was grafted onto high-surface-area (A380) fumed silica (SiO 2 ) by the use of a silane coupling agent, (CH 3 O) 3 −Si−(CH 2 ) 3 −(OCH 2 CH 2 ) x −OCH 3, with x = 6−9, corresponding to an average molecular weight for the PEO segment of 375 g/mol, PEO(375)−silane. The PEO-…
From dielectric relaxation and equation-of-state measurements on polymethylphenylsiloxane and polymethyltolylsiloxane, the relative contributions of volume and thermal energy to the temperature dependence of the segmental relaxation times are quantified. In both polymers, volume exerts a substantial effect, being almo…
The synthesis of linear multiporphyrin arrays with mono- and bisphosphine-substituted porphyrins as ligand donors and ruthenium(II) or rhodium(III) porphyrins as ligand acceptors is described. With appropriate amounts of the building blocks mixed, linear dimeric and trimeric arrays have been synthesized and analyzed b…
Mo K-edge XAFS spectra have been measured for ordered mesoporous silica MCM-41 grafted with the complexes [MoO2X2(thf)2] (X=Cl, Br). For grafting reactions in the absence of triethylamine, materials with 1 wt. % Mo are obtained; the Mo K-edge EXAFS results indicate the co-existence of isolated surface-fixed monomeric…
A highly birefringent, luminescent chiral nematic liquid crystal is shown to have an extremely broad photonic stop band (see dashed line in Figure) overlapping its emission spectrum. Highly circularly polarized photoluminescence is observed from the liquid crystal itself and from an indirectly excited dye dopant. The…