Materials Literature
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The importance of luminescent tungstates and molybdates in several technological applications motivated the study of the structural, luminescence and scintillation properties of the MgWO 4 -MgMoO 4 system.X-ray diffraction studies allowed the identification of three main types of structures in the pseudo-binary MgWO 4…
A hybrid composite associating natural fibers (curaua) and synthetic fibers (E-glass) was developed and investigated. The hybrid is destined for engineering applications as an alternative material to glass fiber composites, mainly in high moisture environments. Thus, an investigation was conducted to evaluate the degr…
In the paper, we successfully prepared spider silk fibroins (Ss)/poly( d, l-lactide) (PDLLA) composite fibrous nonwoven mats for the first time to the best of our knowledge. The morphology of the fibers was observed by a scanning electron microscope (SEM) and transmission electron microscope (TEM). The secondary struc…
Shape control: Gold nanorods are synthesized in high yields in the absence of shape-regulating agents in 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][ES]). A two-step seeded-growth process is used that capitalizes on the binding affinity of imidazolium cations to gold crystal facets, the stabilization of AuI in [E…
Ab initio calculations reveal a universal scaling law on how the electronic structure of boron nitride (BN) nanoribbons and nanotubes is modified by a transverse electric field. Due to the structural symmetry difference, the energy gap of zigzag BN ribbons can be reduced or increased by the electric field depending on…
We report specific-heat measurements at magnetic fields up to 20 T on the recently discovered superconductor ${\text{SmFeAsO}}_{0.85}{\text{F}}_{0.15}$. The $B\text{\ensuremath{-}}T$ diagram of a polycrystalline ${\text{SmFeAsO}}_{0.85}{\text{F}}_{0.15}$ sample with ${T}_{c}=46\text{ }\text{K}$ was investigated. The t…
Abstract Rigid polyurethane foams (RPUFs) have been fabricated from crude MDI (CMDI) and polypropylene glycols (PPGs) of various hydroxyl values (OHVs) of 300–600 with an environmentally friendly blowing agent (HFC 365 mfc ). The closed cell content, compression strength, and dimensional stability of the foam increase…
Abstract Noble metal nanoparticles exhibit a plasmonic resonance that provides them with unique optical properties. The sensitivity of the plasmonic resonance to the surrounding dielectric environment has lead to the development of metal nanoparticles as the basis of biosensing schemes. The sharp enhancement in scatte…
The Flory−Huggins interaction is measured for a model rod−coil block copolymer system, poly(alkoxyphenylenevinylene- b -isoprene), by fitting the interfacial segregation of block copolymer to a homopolymer interface and by using the random phase approximation (RPA) for block copolymers. The measured interfacial segreg…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTpH-Responsive Shell Cross-Linked Nanoparticles with Hydrolytically Labile Cross-LinksYali Li, Wenjun Du, Guorong Sun, and Karen L. Wooley*View Author Information Department of Chemistry and Radiology, Washington University in Saint…
Silicon is employed in a variety of electronic and optical devices such as integrated circuits, photovoltaics, sensors, and detectors. In this paper, Au-assisted etching of silicon has been used to prepare superhydrophobic surfaces that may add unique properties to such devices. Surfaces were characterized by contact…
Using a scanning tunneling microscope we have measured the quantum conductance through a PTCDA molecule for different configurations of the tip-molecule-surface junction. A peculiar conductance resonance arises at the Fermi level for certain tip to surface distances. We have relaxed the molecular junction coordinates…
We have used spin-polarized density functional theory (DFT) to study O(2) evolution on a clean partially reduced rutile TiO(2)(110) surface (i.e., a surface having oxygen vacancies) and its interaction with Au(1) or Au(2) cluster adsorbed on it. We assume that the total spin of the electronic wave function is related…
In search of polymer backbones to bind organic radical pendant groups as redox centers for high-density charge storage application, polyether was employed as a flexible chain with a low glass transition temperature and affinity to electrolyte solutions. Cyclic ethers bearing nitroxide radicals were synthesized and pol…
We study how strain affects orbital ordering and magnetism at the interface between ${\text{SrMnO}}_{3}$ and ${\text{LaMnO}}_{3}$ from density-functional calculations and interpret the basic results in terms of a three-site Mn-O-Mn model. Magnetic interaction between the Mn atoms is governed by a competition between t…
Abstract During surface‐enhanced Raman scattering (SERS), molecules exhibit a significant increase in their Raman signals when attached, or in very close vicinity, to gold or silver nanostructures. This effect is exploited as the basis of a new class of optical labels. Here we demonstrate robust and sensitive SERS lab…
Magnetic $3d$ ions doped into wide-gap oxides show signatures of room-temperature ferromagnetism, although their concentration is two orders of magnitude smaller than that in conventional magnets. The prototype of these exceptional materials is Co-doped ZnO, for which an explanation of the room-temperature ferromagnet…
Negative differential resistance (NDR) was recently observed in carbon nanotube junctions just before breaking and hypothesized to arise from the formation of monatomic carbon wires in the junction. Motivated by these results, a first-principles scattering-state approach, based on density functional theory, is used to…
The characterization of three commercial thermoelectric modules, which are designed for cooling/heating applications, is presented to employ the devices for power conversion, i.e., as thermoelectric generators (TEGs). The thermoelectric theory is briefly summarized at first, taking into account the relationship betwee…
We study the Landé $g$-factor of conduction electrons in the $L$-valley of bulk GaAs and AlAs by using a three-band $\mathbf{k}\cdot\mathbf{p}$ model together with the tight-binding model. We find that the $L$-valley $g$-factor is highly anisotropic, and can be characterized by two components, $g_{\perp}$ and $g_{\|}$…