Materials Literature
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The low-temperature thermal conductivity ($\ensuremath{\kappa}$) of GdFe${O}_{3}$ single crystals is found to be strongly dependent on magnetic field. The low-field $\ensuremath{\kappa}(H)$ curves show two ``dips'' for $H\ensuremath{\parallel}a$ and only one dip for $H\ensuremath{\parallel}c$, with the characteristic…
We present Raman data on both single-crystal and thin-film samples of the multiferroic PbFe${}_{0.5}$Nb${}_{0.5}$O${}_{3}$ (PFN). We show first that the number and selection rules of Raman lines are compatible with a face-centered-cubic $\mathit{Fm}$-3m structure, as is known in other $\mathit{AB}$O${}_{3}$ relaxors,…
Small-sized PbSe nanocrystals (NCs) were synthesized at low temperature such as 50-80 °C with high reaction yield (up to 100%), high quality, and high synthetic reproducibility, via a noninjection-based one-pot approach. These small-sized PbSe NCs with their first excitonic absorption in wavelength shorter than 1200 n…
Graphene/azo polyelectrolyte multilayer films were fabricated through electrostatic layer-by-layer (LbL) self-assembly, and their performance as electrochemical capacitor electrode was investigated. Cationic azo polyelectrolyte (QP4VP-co-PCN) was synthesized through radical polymerization, postpolymerization azo coupl…
Recent studies on nanosized near half-doped manganites reported that the charge-ordered antiferromagnetic states present in their bulk counterparts are strongly suppressed and that ferromagnetic behaviors appear at low temperatures as the particle size is reduced to nanometer scale. In this paper, the effects of size…
Surface properties are often hypothesized to be important factors in the development of safer forms of nanomaterials (NMs). However, the results obtained from studying the cellular responses to NMs are often contradictory. Hence, the aim of this study was to investigate the relationship between the surface properties…
Deacon process revisited: A shaped RuO2/SnO2–Al2O3 catalyst was designed for highly active and stable performance in HCl oxidation to Cl2. In addition to its binding effect, alumina acts as a stabilizer to prevent sintering, endowing the catalyst with extraordinary longevity. Pilot tests give solid prospects for indus…
Oleic acid-conjugated chitosan (oleyl-chitosan) is a powerful platform for encapsulating oleic acid-decorated iron oxide nanoparticles (ION), resulting in a good magnetic resonance imaging (MRI) probe. Oleyl-chitosan could self-assemble into core-shell structures in aqueous solution and provide the effective core comp…
The adiabatic approximation in time-dependent density functional theory (TDDFT) yields reliable excitation spectra with great efficiency in many cases, but fundamentally fails for states of double excitation character. We discuss how double-excitations are at the root of some of the most challenging problems for TDDFT…
Bioinspired approaches represent emerging methods for the fabrication and application of nanomaterials under desirable ambient conditions. By adapting biomimetic processes to technological applications such as catalysis, new directions could be achieved for materials that are reactive under energy efficient and ecolog…
The radiative emission properties of the Dy3+ ions in an oxyfluoride glass and glass-ceramics have been studied for the generation of white light. The x-ray diffraction pattern of the glass-ceramics shows the formation of CaF2 fluorite-type nanocrystals in the glass matrix after a suitable thermal treatment of the pre…
A multiple response: YbIII-HPDO3A has been used for the development of a magnetic resonance imaging method that is able to assess pH value and temperature simultaneously, irrespective of the concentration of the complex (see graph). This contrast agent has potential in a clinical setting as it shows the same stability…
Various transition metal (TM) doped zinc oxide nanoparticles with the composition TM x Zn 1− x O (TM = V, Mn, Fe, Co, and Ni; x = 0.01−0.3) were prepared by a microwave-assisted nonaqueous sol−gel route in benzyl alcohol within a few minutes. The high doping levels in the range 20−30 atom % achieved for Co and Fe prov…
Morphological control of organic nanocrystals (ONCs) is important in the fields ranging from specialty chemicals to molecular semiconductors. Although the thermodynamic shape can be readily predicted, most growth morphologies of ONCs are actually determined by kinetic factors and remain poorly understood. On the basis…
A general method for the synthesis of butterfly-shaped difluoroboradiaza-s-indacenes with different substituents has been developed. The mixed AB dye was produced in two successive Knoevenagel reactions involving first 4-dimethylaminobenzaldehyde and second 4-hydroxybenzaldehyde. Two pathways to A(2)B(2) and ABCD deri…
Topological insulators in the Bi2Se3 family have an energy gap in the bulk and a gapless surface state consisting of a single Dirac cone. Low frequency optical absorption due to the surface state is universally determined by the fine structure constant. When the thickness of these three dimensional topological insulat…
Abstract The magnetic domain structure and Raman scattering have been studied in NiO single-crystals with three different (100), (110) and (111) orientations. Twin-domain structure was observed in NiO(100) and NiO(110) single-crystals using cross-polarized optical microscopy. We found that the ratio of the two-magnon…
Monodisperse polyhedral nanoparticles (NPs) and nanorods (NRs) of cerium dioxide, CeO 2, were synthesized by thermal decomposition of ammonium cerium(IV) nitrate, (NH 4 ) 2 Ce(NO 3 ) 6, at 180 °C in an organic solution of oleylamine (OAm) and/or oleic acid (OA). The 4 nm CeO 2 NPs were synthesized in diphenyl ether so…
A novel phosphorus- and nitrogen-containing compound (POPHA) has been synthesized by allowing phosphorus oxychloride to react with piperazine and 2-hydroxyethyl acrylate (HEA). Its structure was characterized by FTIR, 1 H NMR, and 31 P NMR. A series of UV-curable flame-retardant resins were obtained by blending POPHA…
The correlated oxide SmNiO3 (SNO) exhibits an insulator to metal transition (MIT) at 130 °C in bulk form. We report on synthesis and electron transport in SNO films deposited on LaAlO3 (LAO) and Si single crystals. X-ray diffraction studies show that compressively strained single-phase SNO grows epitaxially on LAO whi…