Materials Literature
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Biomacromolecules represent new structures employed for the fabrication, assembly, and subsequent use of nanomaterials for a variety of applications. By genetically selecting for the binding abilities of these bio-based molecules, the generation of materials with enhanced and environmentally sound properties is possib…
Novel hierarchical ZnO mesocrystals and ultralong ZnO nanowires have been prepared from a precursor of synthetic layered basic zinc acetate nanobelts by a facile solution route in the presence of poly(vinyl pyrrolidone) (PVP). X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscop…
Nanocubes of copper selenide (Cu 2- x Se) have been synthesized through an electrochemical crystallization method using cetyltrimethylammonium bromide (CTAB) as the structure directing agent. The shapes of Cu 2- x Se nanocubes can be controlled by the adsorption effect of CTA + hydrocarbon chain and Br − ion on the fa…
In the present article, we studied the structuration mechanism of palladium nanocrystals (NCs) of different shapes (cubes, pentatwinned nanorods, pyramids, and pentatwinned decahedra) prepared via the seed-mediated reduction of a palladium salt in aqueous medium, in the presence of CTAB surfactant. A detailed time-res…
The preparation, X-ray crystallography, and magnetic investigation of the compounds [Co(H(2)O)(2)(phda)](n) (1), [Co(phda)](n) (2), and [Co(chda)](n) (3) [H(2)phda = 1,4-phenylenediacetic acid and H(2)chda = 1,1-cyclohexanediacetic acid] are described herein. The cobalt atoms in this series are six- (1) and four-coord…
In this work, Evans' homogeneous nonequilibrium molecular dynamics method for estimating thermal conductivity is extended to systems employing three-body potentials. This extension is put on a firm theoretical basis and applied to a silicon lattice modeled by the Stillinger-Weber potential. Two new methods are suggest…
The adsorption of cationic polyelectrolytes (C-PAMs and PDACMAC) with different charge densities and molecular weights on silica and cellulose model surfaces was examined using a quartz crystal microbalance with dissipation, QCM-D. The conformation and viscoelastic properties of the adsorbed polyelectrolyte layers wer…
Paraffin wax deposition is a ubiquitous phenomenon in the petroleum production industry. Many types of internal pipe coating materials have previously been tested for preventing wax deposition, but none have demonstrated successful performance. It has become increasingly evident that an improved knowledge of the chemi…
The strong long-range Coulomb interaction between massless Dirac fermions in graphene can drive a semimetal-insulator transition. We show that this transition is strongly suppressed when the Coulomb interaction is screened by such effects as thermal fluctuation, doping, disorder, and finite volume. It is completely su…
According to model computations at the B3LYP/6-311+G** level, an external electric field can facilitate the heterolytic dissociation of properly oriented water molecules significantly. Depending on the models used, the maximum predicted change of the dissociation energy in the field is ca. -3 to -4 kcal nm mol(-1) V(-…
Docetaxel (Doc) has extraordinary activities against a variety of solid tumors. However, the clinical efficacy of Doc is limited due to its poor solubility, low selective distribution, fast elimination in vivo, etc. In the present study, Doc was incorporated into the core-shell structure of nanoparticles prepared base…
The distance over which two photogenerated charges are separated in electron donor-acceptor systems for artificial photosynthesis depends on the structure of the system, while the lifetime of the charge separation and, ultimately, its ability to carry out useful redox chemistry depend on the electronic coupling betwee…
The authors recently succeeded in growing two-dimensional ZnO nanowalls on sapphire substrates using high-pressure pulsed laser deposition (PLD) without any catalysts. Depending on the PLD growth conditions and the composition of the target, ZnO nanowalls with thickness of tens of nanometers and dimension of several m…
Abstract The synthesis and study of the liquid crystalline, photophysical, and aggregation behavior of novel octupolar oxadiazole derivatives are reported. These molecules formed columnar mesophases at elevated temperatures which transformed into a glassy state at ambient temperatures wherein the columnar order was re…
In situ X-ray diffraction during heating of lobster cuticle reveals three regions of thermally induced transformations: 1)Chitin decomposition, 2) amorphous calcium carbonate (ACC) – calcite transformation, and 3) amorphous calcium phosphate (ACP) – hydroxyapatite transformation. These results provide new insights int…
Highly stable and crystalline V(2)O(5) nanoparticles with an average diameter of 15 nm have been easily prepared by thermal treatment of a bariandite-like vanadium oxide, V(10)O(24) x 9 H(2)O. Their characterization was carried out by powder X-ray diffractometry (XRD), Fourier transform infrared (FT-IR) and Raman spec…
The NO 3 − - and Cl − -containing layered double hydroxides (LDHs) of Mg with Al interact weakly with anions in solution under equilibrated conditions and yield a type V isotherm. The uptake of anions under nonequilibrated conditions varies monotonically with the layer charge when the outgoing anion is NO 3 −, whereas…
We studied the diffusion of gold nanoparticles in semidilute and entangled solutions of polystyrene (PS) in toluene using fluctuation correlation spectroscopy (FCS). The polymer concentration was varied from approximately 6c* to 20c*, where c* is the overlap concentration. In our experiments, the particle radius (R ap…
Two-faced nanocrystals: Rapid addition of a second aliquot of silver nitrate during a polyol synthesis led to the formation of anisotropically truncated octahedrons as a result of oxidative etching and overgrowth of silver nanocubes. Three adjacent faces of the nanocube grew more rapidly than the three other faces, ge…
Nanocomposites with a predominantly exfoliated morphology were prepared by melt blending of organically modified doubled layered hydroxide (LDH) and low density polyethylene (PE). The prepared materials were investigated by differential scanning calorimetry (DSC) and in detail by dielectric spectroscopy. The DSC exper…