Materials Literature
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Multilayered Ge nanocrystals embedded in Si and Ge oxide films have been fabricated on Si substrate by a (SiO(2)+Ge)/(SiO(2)+GeO(2)) superlattice approach, using an rf magnetron sputtering technique with a Ge+SiO(2) composite target and subsequent thermal annealing in N(2) ambient at 750 °C for 5 min. X-ray diffractio…
A summary of analyses of critical behavior in both the ac susceptibility and dc magnetization in single crystal ${\text{Pr}}_{1\ensuremath{-}x}{\text{Ca}}_{x}{\text{MnO}}_{3}$ ($x=0.27$, and 0.29) is presented supplemented by magnetotransport data. The magnetic data indicate that both single crystals exhibit a continu…
Abstract Well‐defined organic/inorganic hybrid fluorinated star polymers were synthesized via atom transfer radical polymerization (ATRP) of 2,2,3,4,4,4‐hexafluorobutyl methacrylate (HFBMA) using octa(aminophenyl)silsesquioxane (OAPS) nano‐cage as initiator. For this purpose, OAPS was transformed into ATRP initiator b…
Abstract The paper summarizes results of high‐temperature single crystal X‐ray diffraction studies for six borate structures and high‐temperature powder X‐ray diffraction data for about 50 borates. The characteristics on thermal expansion of 50 borates of univalent, bivalent and trivalent metals of different dimension…
Abstract We have found that poly(2‐methoxyethylacrylate) (polyMEA) has excellent blood compatibility and proposed that the property is due to freezing bound water in the polymer. This water is defined as that which cold‐crystallizes at around −45°C in the heating process of differential scanning calorimetry (DSC). In…
Docetaxel is one of the most promising chemotherapeutic agents for the treatment of metastatic breast cancer, but it shows fearful side effects. We hypothesized that a novel targeted nanoassembly (TNA) could provide efficient intracellular drug delivery in breast tumor cells overexpressing epidermal growth factor (EGF…
Since the discovery of ferroelectric activity as well as colossal magnetoelectric response in a perovskite-type manganite TbMnO 3 , the study of a new class of magnetoelectric multiferroics has been attracting a great deal of interest. In these multiferroics, ferroelectric order develops upon a magnetic phase transiti…
A new class of luminescent dyes incorporates aromatic residues attached by an ethynyl link to the boron center of a subphthalocyanine (SubPc; see picture). Efficient energy transfer from energy-donor subunits to the SubPc produces very large Stokes shifts, while luminescence quantum yields are maintained. An acid-trig…
An emission band with a maximum at 1430 nm and a FWHM of 100 nm was observed in a Bi-doped fiber under core-pumping in the 1340- 1370 nm wavelength range. Net gain in 1430-1490 nm and laser action in 1443-1459 nm wavelength range in the Bi-doped aluminosilicate fiber have been demonstrated for the first time to our kn…
The magnetic excitations in multiferroic TbMnO 3 have been investigated by inelastic scattering of polarized and unpolarized neutrons in the ferroelectric cycloidal and in the paraelectric collinear phase. The polarization analysis of the excitations at the incommensurate magnetic zone center allows one to determine t…
A directly Pt(IV)-bridged cofacial diporphyrin has been synthesized by the cyclometalation reaction of beta-pyridylporphyrin with a Pt(IV) salt. Upon treatment with methylhydrazine, the Pt(IV) bridge is reduced to the Pt(II) center, resulting in a Pt(II)-bridged cofacial dimer with a helicity inversion of the complex…
We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The ch…
Cellulose-layered montmorillonite (MMT) nanocomposites were prepared by precipitation from N-methylmorpholine- N-oxide (NMMO)/water solutions. Two hybrid samples were obtained to investigate the influence of the reaction time on the extent of clay dispersion within the matrix. It was observed that longer contact times…
Microscopic mechanisms for improper ferroelectricity in multiferroic perovskites: a theoretical review, Picozzi, Silvia, Yamauchi, Kunihiko, Sergienko, Ivan A, Sen, Cengiz, Sanyal, Biplab, Dagotto, Elbio
We have successfully synthesized one member of LnFeAsO (Ln stands for lanthanides) with $\text{Ln}=\text{Tb}$. By partial substitution of ${\text{Tb}}^{3+}$ by ${\text{Th}}^{4+}$, superconductivity with onset ${T}_{c}$ up to 52 K was observed. In the undoped parent compound, the magnetic moments of ${\text{Tb}}^{3+}$…
We review terahertz experiments on magnetoelectric excitations in rare earth multiferroic manganites RMnO 3 with R = Gd, Tb, Dy, (Eu:Y).In all these compounds characteristic excitations of the novel type, called electromagnons, have been observed for frequencies 10 cm -1 < ν < 30 cm -1 .From the spectroscopic point of…
Near-edge X-ray absorption fine structure spectra of three pyrimidine (viz., cytosine, uracil, and thymine) and two purine (viz., adenine and guanine) nucleobases, which are the key constituents of DNA and RNA, were measured at the C, N, and O K-edges using the self-absorption-free partial electron yield mode. The nuc…
We report an air-assisted chemical vapor deposition (CVD) method for the synthesis of super-long carbon nanotube (CNT) bundles. By mixing a small amount of air in the vapor phase catalyst CVD process, the catalyst lifetime can be dramatically increased, and extremely long dense and aligned CNT bundles up to 1.5 cm can…
We describe the correlated electronic structure of a prototype Fe-pnictide superconductor, ${\text{SmO}}_{1\ensuremath{-}x}{\text{F}}_{x}\text{FeAs}$, using local-density approximation plus dynamical mean-field theory. Strong, multiorbital electronic correlations generate a low-energy pseudogap in the undistorted phas…
Combining polarized and unpolarized neutron scattering techniques with x-ray resonant magnetic scattering we have studied the coupling between the Mn- and R-spin-ordering in the multiferroic RMnO 3 , R = Tb and Dy. Polarized neutron diffraction reveals the moment orientation associated with the various modes describin…