Materials Literature
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Double-crystalline diblock copolymers of linear polyethylene (LPE) and hydrogenated polynorbornene (hPN) are synthesized, and their crystallization is examined. LPE and hPN homopolymers are both highly crystalline, with similar melting points near 150 °C and χ hPN/LPE = 0.02. For symmetric diblocks, even when moderate…
Single crystals of boron-doped Ba8Al14Si31 clathrate I phase were prepared using Al flux growth. The structure and elemental composition of the samples were characterized by single-crystal and powder X-ray diffraction; elemental analysis; and multinuclear (27)Al, (11)B, and (29)Si solid-state NMR. The samples' composi…
A series of alkynylrhenium(I) tricarbonyl diimine complexes has been synthesized and shown to display rich thermotropic gelation behavior.
A universal nitric oxide (NO) generating surface is assembled via Layer-by-Layer (LbL) deposition of sodium alginate (Alg) and organoselenium modified polyethyleneimine (SePEI) on quartz and polymeric substrates. The immobilized SePEI species is capable of catalytically decomposing S-nitrosothiol species (RSNO) to NO…
Two homochiral trinuclear clusters, {(MeTp)2Fe2(CN)6Ni[(1R,2R)-chxn]2} (1) and {(MeTp)2Fe2(CN)6Ni[(1S,2S)-chxn]2} (2) [chxn = 1,2-diaminocyclohexane; MeTp = methyltris(pyrazolyl)borate], have been synthesized and structurally characterized. Ferroelectric and magnetic measurements reveal that they are rare examples of…
Vertically aligned carbon nanotubes are grown from Al 2 O 3 -supported Fe−Mo catalyst in a hot filament chemical vapor deposition apparatus. We compare the effect of carbon nanotube growth on deposition of 0.5 and 1 nm thick Fe catalyst layers before and after deposition of 0.1 and 0.2 nm thick layers of Mo. We observ…
The direct synthesis of yttrium amidate complexes using the simple reaction of amide proligands and Y(N(SiMe3)2)3 results in the high-yielding preparation and isolation of crystalline, monomeric materials. The complex, tris(N-2',6'-diisopropylphenyl(naphthyl)amidate)yttrium mono(tetrahydrofuran) (4), was structurally…
The addition of surfactants, which preferentially interact with the PMMA block domains, modifies the surface energy of the system by making the surface energy difference between the two blocks almost equal, resulting in the perpendicular orientation of microphase separated domains in the film.
This article discusses tensile creep behavior of vinyl ester polymer and its nanocomposite with 0.5 wt% functionalized carbon nanofibers. It is shown that for a constant temperature the creep resistance decreases with increasing stress. At lower temperature, higher creep compliance was observed for vinyl ester as comp…
A new isolated bacterial strain A-04 capable of producing high content of polyhydroxyalkanoates (PHAs) was morphologically and taxonomically identified based on biochemical tests and 16S rRNA gene analysis. The isolate is a member of the genus Ralstonia and close to Ralstonia eutropha. Hence, this study has led to the…
We present that an interference lithography technique beyond the diffraction limit can be theoretically achieved by positing an anisotropic metamaterial under the conventional lithographic mask. Based on the special dispersion characteristics of the metamaterial, only the enhanced evanescent waves with high spatial fr…
This study focuses on the syntheses of a series of organic−inorganic hybrid materials in which the triazole heterocyclic organic components were grafted into the silica backbone via covalent bonds through a sol-gel process. The organic parts 3-alkyl-4-amino-5-ylsulfanyl-1,2,4-triazole (O1 and O2) were first prepared b…
Snakes on a plane TEM grid! Tortuous core/shell nanostructures are produced by a simple, additive-free, one-pot hydrothermal reaction at 120–150 °C. Electron diffraction and high-resolution transmission electron microscopy indicate that the inner silver core is coherent. The “nanosnakes” (see image) form through self-…
A study of the influence of the local environment on the light-induced luminescence enhancement of CdSe/ZnS quantum dots (QD) embedded in silica colloids that are dispersed in various solvents is presented. The photoluminescence of the embedded QD is enhanced up to a factor of ten upon photoactivation by ultraviolet o…
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…