Materials Literature
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Quantum dots (Qdot Nanocrystal Conjugates; Quantum Dot, Hayward, CA) exhibit high fluorescence and low photobleaching compared with organic dyes, properties that should enhance their detection at low densities. In view of the properties of Qdots and the biological and pharmaceutical importance of G protein-coupled rec…
Hard and straight: Diamond is the hardest material known, yet polyyne—a molecular rod comprised of CC units—resists longitudinal compression with a Young's Modulus 40 times larger than diamond, whereas [n]staffanes have a Young's Modulus close to that of diamond. Mechanical engineering provides the connection between…
There is increasing interest in developing single-walled carbon nanotubes (SWNTs)-based optical biosensors for remote or in vitro and in vivo sensing because the near-IR optical properties of SWNTs are very sensitive to surrounding environmental changes. Many enzyme-catalyzed reactions yield hydrogen peroxide (H(2)O(2…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSpectral Modulation and Exciton Migration in Thiophene-Based Polybenzobisoxazole Random Copolymers with Donor−Acceptor ArchitecturesYan Chen, Shanfeng Wang, Qixin Zhuang, Xinxin Li, Pingping Wu, and Zhewen HanView Author Information Key Laboratory for Ultrafine Materials of Min…
We study the steady-state and ballistic transport properties of semiconducting zig-zag carbon nanotubes (CNTs) using semiclassical Monte Carlo simulation. Electron-phonon scattering is the only type of interaction included in the model. The band structure and phonon dispersion are derived from that of graphene by the…
Abstract Diglycidyl ethers of bisphenol‐A (DGEBA) epoxy resin, filled separately with organoclay (OC) and unmodified clay (UC), were synthesized at room temperature and at high temperature (80 °C) by mechanical shear mixing. The room temperature curing (RTC) and high temperature curing (HTC) were carried out with the…
A large number of single-crystalline Ag 2 V 4 O 11 nanobelts with thickness of 10–30 nm, width of 70–200 nm, and lengths of 2–5 µm have been successfully synthesized by a hydrothermal method. The morphologies and structures of the nanobelts were characterized by x-ray powder diffraction, x-ray photoelectron spectrosco…
We present a method for directly locating density-driven phase transitions in multicomponent systems. Phase coexistence conditions are determined through manipulation of a total density probability distribution evaluated over a density range that includes both coexisting phases. Saturation quantities are determined th…
Three mesogenic dimers have been synthesized in which a five-ring bent-core moiety is connected with different calamitic units flexible spacers. The mesophase behavior of the dimers have been investigated by polarizing microscopy, differential scanning calorimetry, X-ray diffraction on oriented samples and by dielectr…
We report how the placement of nucleobase units, thymine, or N6-(4-methoxybenzoyl)adenine, onto the ends of a mesogenic core, bis-4-alkoxy-substituted bis(phenylethynyl)benzene, affects the properties of these materials. We show that addition of these bulky polar groups significantly reduces the range of liquid-crysta…
The variable temperature magnetic susceptibility, X-ray crystallography, and Mössbauer and Raman spectra of a new dinuclear complex-based one-dimensional coordination polymer [[Fe(II)2(NCS)2(mu-bpypz)2](micro-4,4'-bpy)].MeOH demonstrated a steep one-step [HS-HS] to [LS-LS] spin transition.
Abstract Orthogonal polymer brush gradients are assemblies of surface‐anchored macromolecules, in which two material properties of the grafted chains ( e.g. , grafting density, molecular weight) vary independently in orthogonal directions. Here, we describe the formation and applications of two such orthogonal assembl…
We present first-principles total-energy density-functional theory electronic structure calculations for the neutral and charge states of an oxygen vacancy in $\mathrm{K}{\mathrm{H}}_{2}\mathrm{P}{\mathrm{O}}_{4}$ (KDP). Even though the overall density of states profiles for the defective KDP are quite similar to thos…
Polymer glasses have very appealing properties for a number of optical and other applications and their high resistance to plastic deformation, expressed as the ratio of low temperature yield stress to elastic modulus of order 0.05, is an additional bonus. Their normalized resistance to crack propagation, as measured…
In this work, we studied the far-field properties of the microwave radiation from sources embedded inside the split-ring resonator (SRR) metamaterial medium. Our results showed that the emitted power near the resonance frequency of the SRR structure was confined to a narrow angular region in the far field. The measure…
A Co-doped ZnO nanoneedle array with room-temperature ferromagnetic properties was successfully fabricated by pulsed laser deposition (PLD) method. Detailed nanostructures were studied by transmission electron microscopy (TEM) and x-ray diffraction (XRD). High resolution TEM images and selected area electron diffracti…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDirected Nanoparticle Binding onto Microphase-Separated Block Copolymer Thin FilmsWolfgang H. Binder, Christian Kluger, Christoph J. Straif, and Gernot FriedbacherView Author Information Institute of Applied Synthetic Chemistry/Divi…
The structure, stability, and O2 adsorption properties of anionic Au(n) (n=1-11) clusters either free or supported at defected MgO100 surfaces are investigated using density-functional theory. O2 adsorption is strong whenever unpaired electrons are present, except for at some small, supported, planar, high-band-gap cl…
One-dimensional chiral copper(II) and manganese(II) coordination polymers with single asymmetric end-to-end (EE) azide bridges, [Cu(R-L)2(N3)]n(ClO4)n (1), [Cu(S-L)2 (N3)]n(ClO4)n (2), [Mn(R-L)2(N3)]n(ClO4)n (3), and [Mn(S-L)2(N3)]n(ClO4)n (4) (R-L or S-L = R- or S-pyridine-2-carbaldehyde-imine), have been synthesized…
The reaction of tris(alkylthio)tetrathiafulvalene thiolates with 3-chloro-2,4-pentanedione affords tetrathiafulvalene (TTF) moieties substituted by the acetylacetone function (TTFSacacH), precursors of novel redox-active ligands: the acetylacetonate ions (TTFSacac). These TTFSacacHs have been characterized by X-ray di…