Materials Literature
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A rare micro6-oxo-centered Mn6 mixed-valent cluster (1) is prepared and used as a secondary building unit for the self-assembly of its azido-bridged polymeric analogue (2) in a systematic way with the retention of the Mn6 core of 1. Both complexes are characterized by X-ray single-crystal structure determination. The…
BACKGROUND: Time-resolved immunofluorometric assays (TrIFA) using lanthanide-labeled nanoparticles have greatly increased the sensitivity of immunoassays. Current labeling strategies, however, use either physical doping of lanthanide chelates into preformed nanoparticles or covalent linking of lanthanide chelates to p…
We report a high-yield facile synthesis of uniform single-crystalline γ-CuI nanocrystals with tetrahedral morphology from the reaction between Cu n and KI under ambient conditions. In our method, I - perform the roles of reactant and surface stabilizing agent, thereby reducing the complexity of the reaction by elimina…
Using a domestic microwave oven and new, inexpensive precursors, a rapid and reliable synthesis of highly luminescent CdSe/ZnS NPs was developed. To evaluate the quality of our core/shell particles for varying shell thickness in comparison to that of CdSe/ZnS nanoparticles obtained commercially, the parameter fluoresc…
The quinacridone derivatives N, N ‘ -dialkyl-1,3,8,10-tetramethylquinacridone (C n TMQA, n = 6, 10, 14) were used as building blocks to assemble luminescent nano- and microscale wires. It was demonstrated that C n TMQA with different lengths of alkyl chains display obviously different wire formation properties. C10TMQ…
We present a model of charge transport in organic molecular semiconductors based on the effects of lattice fluctuations on the quantum coherence of the electronic state of the charge carrier. Thermal intermolecular phonons and librations tend to localize pure coherent states and to assist the motion of less coherent o…
The electric conductance of a strip of undoped graphene increases in the presence of a disorder potential, which is smooth on atomic scales. The phenomenon is attributed to impurity-assisted resonant tunneling of massless Dirac fermions. Employing the transfer matrix approach we demonstrate the resonant character of t…
We report on a complete characterization of the optical dispersion properties of conducting thin films of single-wall carbon nanotubes (SWCNTs). The films studied exhibit sheet resistances between 50 and $1000\phantom{\rule{0.3em}{0ex}}\ensuremath{\Omega}∕\mathrm{sq}$ and optical transparencies between 65% and 95% on…
Temporal fluctuations of spectral shapes have been observed in tip-enhanced Raman scattering (TERS) spectra of adenine molecules. The TERS spectra of a nanocrystalline cluster of adenine molecules showed distinct temporal changes including fluctuations of peak frequencies and peak intensities and extraordinary enhance…
Capacitance-voltage (C-V) characteristics are important for understanding fundamental electronic structures and device applications of nanomaterials. The C-V characteristics of graphene nanoribbons (GNRs) are examined using self-consistent atomistic simulations. The results indicate strong dependence of the GNR C-V ch…
Exploitation of the remarkable kinetic inertness and ability of chiral aggregates built with opposite charged porphyrins to self-replicate leads to a system able to cycle between a chiral and an “achiral” state.
We use molecular dynamics simulations to shed light on polymorph selection during the crystallization of the Lennard-Jones fluid. By varying pressure at fixed supercooling, we form large crystallites either of the stable face centered cubic form or of the metastable body centered cubic form and even fine-tune the frac…
The electronic properties of supported gold nanoparticles were determined using X-ray absorption near-edge spectroscopy (XANES) at the gold L III -edge. The whiteline intensity decreased with decreasing particle size, suggesting that smaller particles contained more d electrons. No change in the whiteline intensity, h…
Reactive oxygen species (ROS) play important roles in multiple physiological processes such as cellular signalling and stress responses, whereas, the hydrogen peroxide (H(2)O(2)) scavenging enzyme ascorbate peroxidase (APX) participates in the regulation of intracellular ROS levels. Here, a cotton (Gossypium hirsutum)…
Surface x-ray diffraction has been employed to elucidate the surface structure of $\mathrm{Ti}{\mathrm{O}}_{2}(110)(1\ifmmode\times\else\texttimes\fi{}1)$. The atomic coordinates emerging from this study are in excellent agreement with those derived in other recent quantitative structure determinations of this surface…
The objective of this study was to overcome drug resistance upon systemic administration of combination paclitaxel (PTX) and the apoptotic signaling molecule C(6)-ceramide (CER) in biodegradable poly(ethylene oxide)-modified poly(epsilon-caprolactone (PEO-PCL) nanoparticles. Subcutaneous sensitive (wild-type) and mult…
We report the results of a detailed investigation of sol-gel-synthesized nanoscale Zn(1-x)Co(x)O powders processed at 350 °C with 0≤x≤0.12 to understand how the structural, morphological, optical and magnetic properties of ZnO are modified by Co doping, in addition to searching for the theoretically predicted ferromag…
A novel nanocomposite device, which consists of liquid crystals and semiconductor nanorods, has been designed and fabricated. It reveals a very unique and useful behavior in that the polarization of the emission from semiconductor nanorods can be controlled by an external bias. The large magnitude of polarization anis…
The authors present a generalized theory of microphase separation for charged-neutral diblock copolymer melt. The stability limit of the disordered phase for salt-free melt has been calculated using random phase approximation (RPA) and self-consistent-field theory (SCFT). Explicit analytical free energy expressions fo…
We have performed polarization-dependent ultrafast pump-probe spectroscopy of a film of aligned single-walled carbon nanotube bundles. By taking into account imperfect nanotube alignment, as well as anisotropic absorption cross sections, we quantitatively determined distinctly different photobleaching dynamics for pol…