Materials Literature
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Dielectric spectra measured within 10−3Hz⩽f⩽104Hz in the paraelectric state of Sr0.61Ba0.39Nb2O6 (SBN61) at T>320K reveal a broadened Debye-type relaxation at f≈100Hz and a power-law low-f increase at f<10−1Hz. These anomalies are attributed to the dynamic modes wall segment relaxation and creep of the i…
Bi 1.5 Zn 1.0 Nb 1.5 O 7 ∕ Ba 0.6 Sr 0.4 Ti O 3 ∕ Bi 1.5 Zn 1.0 Nb 1.5 O 7 (BZN/BST/BZN) sandwich films were deposited by radio frequency magnetron sputtering. The relative permittivity and dielectric loss of the sandwich films were measured using planar Pt∕BZN∕BST∕BZN∕Pt∕Ti∕SiO2∕Si capacitor structures. The sandwich…
An efficient technology for manufacturing high-performance ionization gas sensors using carbon nanotubes as electrode materials that identify gases in some short sampling distance is developed in this letter. The microarray with five sensor units of different gap sizes (S≈6, 7, 8, 10, and 12μm) can break down gases at…
The anisotropy effect in charge transfer induced by collision of ${\mathrm{C}}^{q+}$ ions $(q=2,4)$ on uracil has been studied theoretically using ab initio molecular methods followed by a semiclassical dynamical treatment. The process depends strongly on the orientation of the projectile in the ${\mathrm{C}}^{4+}+\te…
Poly( cross -styrene)- inter -poly( cross -methyl methacrylate) interpenetrating polymer networks (IPNs) were prepared by simultaneously photo-cross-linking an anthracene-labeled polystyrene and photopolymerization of methyl methacrylate (MMA) monomer in the presence of ethylene glycol dimethacrylate (EGDMA) used as a…
The results of synchrotron x-ray diffraction and magnetization measurements on a triangular lattice antiferromagnet $\mathrm{Cu}\mathrm{Fe}{\mathrm{O}}_{2}$ subjected to a pulsed high magnetic field are reported. We find the lattice constant, $b$, contracts stepwise with increasing magnetic field in coincidence with t…
This letter illustrates the transport phenomena associated with single-walled carbon nanotube (SWNT) junctions of Y- and cross-configurations. Localized gating effect exhibited by Y- and crossed-junctions suggests the resemblance of their electrical characteristics with ambipolar and unipolar p-type FETs, respectively…
The maximum cooling temperature of a uniform thermoelectric material is limited by its nondimensional figure of merit ZT. Conventionally cascaded stages or materials with a larger figure of merit are needed to obtain a higher cooling temperature. In this letter, the authors prove that the maximum cooling in an optimal…
The effect of various diene ligands, namely 1,5-cyclooctadiene (cod), 2,5-norbornadiene (nbd), endo -dicyclopentadiene (dcp), tetrafluorobenzobarrelene (tfb), and tetrachlorobenzobarrelene (tcb), was examined in the Rh-catalyzed polymerization of phenylacetylene, aiming at the development of novel active catalysts. Th…
The L-Valinate anion coordinating zinc complex, [<TEX>$Zn(val)_2(H-2O)$</TEX>], was isolated and structurally characterized by single crystal X-ray crystallography. The crystal possess orthorhombic symmetry with a space group <TEX>$P2_12_12_1$</TEX>, Z = 4, and a = 7.4279(2)<TEX>$\AA$</TEX>, b = 9.4342(2)<TEX>$\AA$</T…
The convergent synthesis of symmetric PAMAM-like dendrimers from azide-functionalized poly(amido- amine) (PAMAM) dendrons and two different multi-alkynes was investigated. The stitching method was based on the click chemistry protocol, i.e., the copper-catalyzed cycloaddition reaction between an alkyne and an azide.
Significant effort is being expended on the integration of silicon electronics and optoelectronics. Here the authors describe a method to create planar gradient refractive index (GRIN) lenses in Si using porous silicon (PSi) technology. The authors’ approach allows the fabrication of a single planar lens or an array o…
ZnO quantum dots (QDs)-SiO2 nanocomposite films were prepared using the target-attached radio-frequency sputtering. The transmission electron microscopy revealed the uniform dispersion of ZnO QDs with diameters about 2–7nm in amorphous SiO2 matrix. The photoluminescence showed that small ZnO QDs are able to emit white…
Several thin films of single‐walled carbon nanotube (SWCNT) were prepared on ITO glasses by electrolytic micelle disruption methods using surfactants bearing a ferrocenyl moiety (1a and 1b). Surfactant 1a has a polyethylene glycol unit as the hydrophilic moiety, while surfactant 1b has an ammonium salt unit. The surfa…
An analytical expression is derived for the pitch of a system of electrostatically chiral hard Gaussian overlap (HGO) particles. The calculations are performed for a planar geometry, i.e. the HGO particles are confined in a plane perpendicular to the helical axis and they are oriented in the direction of the local nem…
The authors demonstrate the change of the polarization of the electromagnetic wave induced by chiral metamaterials in the terahertz region. The polarization of the incident terahertz wave changes dramatically after transmitting through the chiral metamaterials made of the array of screw holes in metal slabs. A strong…
Brillouin and Raman scatterings of a 0.71Pb(Ni1∕3Nb2∕3)O3-0.29PbTiO3 single crystal have been measured to investigate broadband inelastic spectra. The two different central peaks related to fast and slow relaxation processes have been observed separately. These two processes are attributed to the thermally activated s…
A series of 10 novel polyoxometalate (W/Mo) compounds connected via a trivalent lanthanide cation bridge, H2{[K(H2O)2]2[Ln(H2O)5]2(H2M12O42)}.n(H2O) (Ln = La, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Lu; M = W or W/Mo) (1-10), were designed and synthesized on the basis of the abduction of Al3+ in aqueous solution. X-ray diffra…
Using Monte Carlo simulations of the bond fluctuation model and self-consistent field calculations, we study the formation of micelles in a mixture of homopolymers and asymmetric AB-diblock copolymers with composition, f A = 1 / 8 . Both types of molecules are fully flexible and have identical length. We work in the s…
The electrical properties of Na1∕2Bi1∕2Cu3Ti4O12 (NBCTO) ceramics between ∼8 and 400K are electrically inhomogeneous, consisting of semiconducting grains and insulating grain boundaries, similar to isostructural CaCu3Ti4O12 (CCTO); however, the intrinsic permittivity of NBCTO of ∼250 at 10K is much higher compared to…