Materials Literature
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We reinterpret the scanning-probe Raman spectra shown in the paper of Neacsu et al. [Phys. Rev. B 73, 193406 (2006)] and compare it to a variety of single-molecule surface-enhanced Raman studies. The observed blinking behavior and spectral features must be attributed to carbon contaminations rather than to malachite g…
Solid solutions BiMn1-xMxO3 with M=Al, Sc, Cr, Fe, and Ga and 0<or=x<or=0.2 were prepared at a high pressure of 6 GPa and 1333-1453 K, and their magnetic, thermal, and structural properties were investigated. The orbital-ordered monoclinic phase of BiMnO3 (phase I) is destroyed by a small percentage of substitution. T…
Abstract Here we report the synthesis of 2–5 nm size gold nanoparticle labels for surface‐enhanced Raman Spectroscopy (SERS) based immunoassay to detect protein molecules. The Au nanoparticles were conjugated with fluorescein isothiocyanate (FITC) and goat anti‐h‐IgG (immunoglobin) and the resultant particles were use…
Abstract Poly(ethylene naphthalene‐2,6‐dicarboxylate) has been uniaxially stretched at different draw ratios and at two different temperatures below and above its glass transition ( T g ∼ 120 °C) respectively, at 100 and 160 °C. Crystallinity has been evaluated from calorimetric analyses and compared to the values ded…
Abstract We have studied the lattice vibrational modes of Zr‐substituted Bi 4 Ti 3 O 12 ceramics using micro‐Raman spectroscopy. Replacement of Zr at the Ti site in the perovskite block is found from the increase in the lattice parameters as a function of Zr contents. Combined X‐ray diffraction patterns and Raman anal…
The electromagnetic properties of a bulk sample of high quality single-wall carbon nanotubes with a mean diameter of $2.5\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ were investigated by noninvasive methods. The observed sudden increase in the microwave absorptivity below $12\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is taken…
We report the phase structures observed in blends of poly(styrene- b -4-vinylpyridine) (PS- b -P4VP) block copolymer (BCP) and a bent-core molecule 1-[4‘-(3‘ ‘,4‘ ‘,5‘ ‘-tridecyloxybenzoyloxy)phenyleneoxycarbonyl]-3-[(4‘-hydroxyphenyl)oxycarbonyl]benzene (BP). Hydrogen bonding between the terminal −OH group of BP and…
We investigate the bending flexibility of carbon nanotubes (CNTs) with encapsulated C 60 fullerenes, using molecular dynamics (MD) simulations. Our simulations on the bending of the fully ((C 60 ) 12 @ (10,10)) and partially ((C 60 ) 10 @ (10,10)) filled peapods show an 18 and 6.3% increase of the flexural rigidity, a…
Abstract The chain‐extension behavior of 2,2′‐bis(2‐oxazoline) (BOZ) was studied to evaluate the coupling effect on polyamide‐6 (PA6) in a Haake Rheocord mixer and an extruder. The relative torque of PA6 dramatically increased within 1–2 min, and the results were similar whether the added amount of BOZ in PA6 was the…
A periodic density functional modeling study of the partial oxidation of methanol to formaldehyde on an Ag(111) surface is presented. Methoxide binds strongly to the surface, preferentially to the highest coordination adsorption sites, while methanol and formaldehyde are weakly adsorbed far from the surface, with no p…
We report the results of a neutron powder diffraction study of the yttrium tantalates Y 0.785 Ta 0.215 O 1.715 and Y 0.7 Ta 0.3 O 1.8 . In the orthorhombic fluorite-related Y 0.7 Ta 0.3 O 1.8 compound, the Y and Ta atoms were occupationally ordered, and the oxygen ions were localized at around the stable positions. On…
The translational diffusion coefficient D(trans) for rubrene, 9,10-bis(phenylethynyl)anthracene (BPEA), and tetracene in the fragile molecular glass-former sucrose benzoate (SB) (Tg=337 K) was studied as a function of temperature from Tg+3 K to Tg+71 K by use of the holographic fluorescence recovery after photobleachi…
The effect of encapsulation of C 60 fullerenes upon the buckling strength of hosting carbon nanotubes (CNTs) has been investigated, using molecular dynamics (MD) simulations. The simulation results show that encapsulating C 60 fullerenes into some CNTs with diameters larger than that of the (10, 10) CNT, in particular…
The electrodynamics near the metal-to-insulator transitions induced, in ${\mathrm{V}}_{3}{\mathrm{O}}_{5}$ single crystals, by both temperature $(T)$ and pressure $(P)$ has been studied by infrared spectroscopy. The $T$ and $P$ dependence of the optical conductivity may be explained within a polaronic scenario. The in…
In this paper we have studied the effect of increasing carbon multi-walled nanotube (CNT) concentration in composites of syndiotactic polypropylene (sPP) having the same crystalline form but different morphologies. The attention was focused on the form I of sPP with different degrees of perfection (in terms of percent…
We report on a hybrid chemical sensor that can perform either amperometric or conductometric detection alone or simultaneously. It consists of an array of electrode pairs in which the two electrodes in each pair are separated with micrometer to nanometer-scale gaps. The gaps are bridged with conducting polymer (polyan…
The structures of the catalytically active sites in supported metal catalysts are a long sought after goal. In this study, XAS has been used to establish these structures. The ethene-induced changes in the XAS spectra as a function of temperature and pressure were correlated to changes in the adsorption mode of the hy…
Macrocyclic systems derived from crown-annelated terthiophene involving a median EDOT unit have been synthesized by coupling diiodooligooxyethylene chains and bis(2-cyanoethylsulfanyl)terthiophene under high dilution conditions. The metal cation complexing properties of the compounds have been analyzed using 1H NMR, U…
A series of rodlike ruthenium(II)-rhodium(III) polypyridine dyads based on modular oligo-p-phenylene bridges, of the general formula [(Me2phen)2Ru-bpy-(ph)n-bpy-Rh(Me2bpy)]5+ (Me2phen=4,7-dimethyl-1,10-phenanthroline; bpy=2,2'-bipyridine; ph=1,4-phenylene; n=1-3), have been synthesized and their photophysical properti…
We present a mathematically simple procedure to explain spontaneous symmetry breaking in quantum systems. The procedure is applicable to a wide range of models and can be easily used to explain the existence of a symmetry broken state in crystals, antiferromagnets, and even superconductors. It has the advantage that i…