Materials Literature
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Abstract Summary: Based on the results from agglomerate‐free PMMA nanocomposites with 10 and 20 wt.‐% spherical SiO 2 nanoparticles, it has been shown that indentation fracture mechanics is a straightforward, powerful, cost‐effective and time‐effective tool for analyzing the fracture resistance of novel polymer materi…
The temperature dependence of magnetocrystalline anisotropy constants and the saturation magnetization in a single variant state have been investigated for L10-type Fe60Pt40 bulk single crystal prepared under compressive stress. The uniaxial magnetocrystalline anisotropy constant Ku evaluated from the magnetization cu…
Abstract The relationships between the structure and properties have been established for copolymers of propylene and 1‐hexene synthesized with an isotactic metallocene catalyst system. The most important factor affecting the structure and properties of these copolymers is the comonomer content. The thermal treatment,…
Many native proteins occasionally form partially unfolded forms (PUFs), which can be detected by hydrogen/deuterium exchange and NMR spectroscopy. Knowledge about these metastable states is required to better understand the onset of folding-related diseases. So far, not much is known about where PUFs reside within the…
Carbon nanofibers were grown on flexible polyimide substrates using an ion-beam sputtering technique. Field emission measurement showed a fairly low threshold voltage of 1.5V∕μm with a current density of 1μA∕cm2. The field enhancement factor was determined to be 4400. The emitter showed resilience when exploited as a…
Abstract Summary: We demonstrate in this communication that large‐scale coaxial nanocables of polypyrrole (PPy)/TiO 2 can be obtained via three steps: (1) synthesis of TiO 2 nanofibers by electrospinning; (2) physical adsorption Fe 3+ oxidant on the surface of TiO 2 nanofibers; (3) followed by polymerization of pyrrol…
Abstract Summary: A novel method for the encapsulation of biomacromolecules, such as nucleic acids and proteins, into polyelectrolyte microcapsules is described. Fluorescence‐labelled double‐stranded DNA and human serum albumin (HSA) are used as model substances for encapsulation in hollow microcapsules templated on h…
Under conditions of sufficiently slow flow, foams, colloids, granular matter, and various pastes have been observed to exhibit shear localization, i.e., regions of flow coexisting with regions of solidlike behavior. The details of such shear localization can vary depending on the system being studied. A number of the…
Precise determination of DNA concentration without the health risks of intercalating dyes is possible via the optical changes that arise from DNA-induced aggregation of cationic conjugated polyelectrolytes. Addition of DNA to a conjugated electrolyte containing two fluorophores results in aggregation and fluorescence…
Hydrothermally prepared nanophosphor Y2SiO5:Ce crystallizes in the P21∕c structure, rather than the B2∕b structure observed in bulk material. Relative to bulk powder, nanophosphors of particle size ∼25–100nm diameter exhibit redshifts of the photoluminescence excitation and emission spectra, reduced self absorption, e…
A simple model based on the balance between mechanical bending and capillary interaction is proposed to understand the bundling of nanorods in nanocarpet effect. The cluster energy minimization reveals that the cluster size is closely related to the nanorod aspect ratio, diameter, density, Young's modulus, as well as…
The optical properties of nanocrystalline diamond films grown from a hydrogen-rich CH4∕H2 gas phase by hot filament chemical vapor deposition, as well as from an argon-rich Ar∕CH4 gas phase by microwave plasma enhanced chemical vapor deposition, are reported. The influence of nitrogen incorporation on the optical abso…
Raman scattering has been used to study the influence of nitrogen, a potential acceptor in ZnO, on the lattice dynamics of ZnO. It is found that N+ implantation increased the lattice disorder and induced some vibration modes to be Raman active at 275, 504, and 644cm−1, respectively. Based on theoretical and experiment…
The crystal stabilities of $\ensuremath{\alpha}$- and $\ensuremath{\beta}$-boron are studied theoretically by the density-functional calculations. The ground-state properties and thermodynamic properties are calculated by the pseudopotential method. These calculated thermodynamic properties include the effect of atomi…
Abstract Summary: A novel carbonization agent was synthesized and characterized. The flame retardancy and thermal behavior of a new IFR system with and without metal chelates for LDPE were investigated by LOI, UL‐94 test, and TGA. Metal chelates can remarkably improve the flame retardant performance of intumescent sys…
Bi nanotubes embedded in anodic alumina membranes were fabricated by pulsed electrodeposition. Scanning electron microscope, x-ray diffraction, and high-resolution transmission electron microscope analyses revealed that the Bi nanotubes are highly oriented and single crystalline. Electronic transport measurements prov…
$\mathrm{MnTe}$ with a hexagonal structure of $\mathrm{NiAs}$ type is an antiferromagnetic semiconductor below the N\'eel temperature ${T}_{N}=310\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The spin-wave excitations of a $\mathrm{MnTe}$ single crystal have been measured at $T=11\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ by in…
We study the effect of the shape anisotropy on the magnetic domain configurations of a ferromagnetic semiconductor (Ga,Mn)As/GaAs(001) epitaxial wire as a function of temperature. Using magnetoresistance measurements, we deduce the magnetic configurations and estimate the relative strength of the shape anisotropy comp…
Abstract Summary: MWNT mixtures with PC were prepared in three different miniature mixers at 265 °C and 50 rpm for 6 min by the master batch dilution method. One mixer is a 4.5 cm 3 DACA microcompounder (DACA Instruments) consisting of two conical co‐rotating screws with a bypass, allowing the material to circulate fo…
Abstract Lateral epitaxial overgrowth (LEO) of ZnO has been demonstrated in water at 90 °C. The process starts with hydrothermal epitaxial growth of ZnO(0001) on MgAl 2 O 4 (111), followed by channel stamping of photoresist to define “growth windows”. LEO films grow in zinc‐precursor solutions at pH 10.9; sodium citra…