Materials Literature
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A heterometallic backbone has been obtained for the first time in a trinuclear complex of bis(2-pyridyl)amide (dpa), namely, [Co2PdCl2(dpa)4] (1). The crystal structure (depicted), magnetic measurements, and DFT calculations suggest that its ground state results from coupling of two high-spin CoII ions separated by a…
Cobaltous oxide (CoO) has been studied by using density-functional theory and the generalized-gradient approximation with correction for Hubbard energy. The calculated electronic structure indicates that CoO is a charge transfer insulator since the $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}3d$ and $\mathrm{O}\phantom{\ru…
We study the effect of electron-electron interactions in the electronic properties of a biased graphene bilayer. This system is a semiconductor with conduction and valence bands characterized by an unusual ``Mexican-hat'' dispersion. We focus on the metallic regime where the chemical potential lies in the Mexican hat…
Abstract Polyaniline (PANI) salts doped with organic sulfonic acids (methanesulfonicacid, p ‐toluenesulphonic acid, and dodecylbenzenesulphonic acid) were first synthesized by using solid‐state polymerization method. The polymers were characterized by Fourier transform infrared (FTIR) spectra, ultraviolet‐visible spec…
Barium hexaferrites (BaFe12O19) are especially useful for microwave/millimeter devices. Due to large ferromagnetic resonance (FMR) loss (linewidths >2kOe), traditional compacts of polycrystalline Ba ferrites indeed hinder the utilization of the materials for practical devices. The present experiment demonstrate…
Abstract The main goal of this research is to investigate the effect of nano‐CaCO 3 coated with different content of stearic acid on fracture toughness of HDPE/CaCO 3 nanocomposite. For this purpose, HDPE/10 vol % CaCO 3 nanocomposites were made using a twin‐screw mixer–single‐screw extruder. Nanocomposite standard sa…
A molecular mechanism for nucleation for the solid-state polymorph transformation of terephthalic acid is presented. New methods recently developed in our group, aimless shooting and likelihood maximization, are employed to construct a model for the reaction coordinate for the two system sizes studied. The reaction co…
Abstract The nonisothermal crystallization kinetics of linear and long chain branched polypropylene (LCB PP) were investigated by differential scanning calorimetry (DSC) at various cooling rates. Several methods such as Avrami, Ozawa, and Jeziorny were applied to describe the crystallization process of linear PP and L…
Wrap it up: Nanoribbons coated with cell-penetrating peptides (CPPs) allowed the encapsulation of hydrophobic guest molecules. The nanoassembly internalized into mammalian cells with high efficiency and showed selective intracellular compartmentalization owing to its sensitivity to the solution environment.
Abstract Fifty vegetable oil‐based polyols were characterized in terms of their hydroxyl number and their potential of replacing up to 50% of the petroleum‐based polyol in waterborne rigid polyurethane foam applications was evaluated. Polyurethane foams were prepared by reacting isocyanates with polyols containing 50%…
High Resolution Image Download MS PowerPoint Slide The structure of single-wall carbon nanohorn (SWNH) was analyzed with X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The considerably strong peak due to single bonding carbons was observed in C1s XPS spectrum of SWNH. This peak intensity increases with…
A metamaterial (MM) differs from an ordinary optical material mainly in that it has a dispersive magnetic permeability and offers greatly enhanced design freedom to alter the linear and nonlinear properties. This makes it possible for us to control the propagation of ultrashort electromagnetic pulses at will. Here we…
No family resemblance: IR photodissociation experiments and DFT optimizations implementing a genetic algorithm suggest that small aluminum oxide clusters have unusual structures in the gas phase. For example, the structure proposed for [(Al2O3)4]+ (see picture; Al black, O gray) has no features in common with bulk alu…
In a rather contradictory situation regarding magnetic data on Co-doped ZnO, we have succeeded in fabricating high-quality single crystalline Zn(1-x)Co(x)O (x=0.003-0.07) thin films. This gives us the possibility, for the first time, to examine the intrinsic magnetic properties of ZnO:Co at a quantitative level and th…
Sound effects: Multilayered capsules, such as that shown in the SEM image, are promising vehicles for the delivery of macromolecular drugs. Ultrasonic irradiation can be used to trigger the release of encapsulated species from capsules fabricated using layer-by-layer technology. Ultrasound affects the integrity of the…
Transport properties through wide and short ballistic graphene junctions are studied in the presence of arbitrary dopings and magnetic fields. No dependence on the magnetic field is observed at the Dirac point for any current cumulant, just as in a classical diffusive system, both in normal-graphene-normal and normal-…
Three-terminal devices with conduction channels formed by quasi-metallic carbon nanotubes (CNTs) are shown to operate as nanotube-based field-effect transistors under strong magnetic fields. The off-state conductance of the devices varies exponentially with the magnetic flux intensity. We extract the quasi-metallic CN…
Abstract Surface charged iron oxide (Fe 3 O 4 ) nanoparticles were used for the synthesis of sulfonated polyaniline (SPAN)‐Fe 3 O 4 nanocomposites (SPAN/Fe 3 O 4 ‐NCs). 2,5‐diaminobenzenesulfonic acid (DABSA) and 2‐aminobenzenesulfonic acid (ABSA) were independently polymerized with aniline to form SPAN. The structure…
Abstract Three different kinds of nanoparticles for paracellular transport were prepared using a simple and mild ionic‐gelation method. Sodium tripolyphosphate (TPP) as crosslinking agent was added into three kinds of solutions, which were chitosan solution, physical blending solution of chitosan, and glycidyl trimeth…
We introduce a new technique for measurement of the thermal conductivity of ultrathin films of single-walled carbon nanotubes (SWNTs) utilizing IR radiation as heat source and the SWNT film as thermometer. The technique is applied to study the temperature dependence of the thermal conductivity of an as-prepared SWNT f…