Materials Literature
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Robust room-temperature ferromagnetism is shown in Zn0.85Co0.05Li0.10O nanocrystals. The studies show that the RT ferromagnetism observed in the Zn0.85Co0.05Li0.10O samples is intrinsic in nature. The figure illustrates (schematically) the effect of surfactant treatment in activating the ferromagnetism.
Gold is not so inert after all! X-ray absorption spectroscopy was used to probe the activation of O2 and its reaction with CO over an Au/Al2O3 catalyst. The catalytic activity of small gold particles in the oxidation of CO arises from their ability to transfer charge to oxygen (see picture).
We observe the assembly of CdS nanorod superlattices by the combination of a DC electric field and solvent evaporation. In each electric-field (1 V/microm) assisted assembly, CdS nanorods (5 nm x 30 nm) suspended initially in toluene were observed to align perpendicular to the substrate. Azimuthal alignment along the…
An ab initio pseudopotential method based on density functional theory, generalized gradient corrections to exchange and correlation, and projector-augmented waves is used to investigate structural, energetical, electronic, and optical properties of $\mathrm{MgO}$, $\mathrm{ZnO}$, and $\mathrm{CdO}$ in rocksalt, cesiu…
We analyze, within a minimal model that allows analytical calculations, the electronic structure and Landau levels of graphene multilayers with different stacking orders. We find, among other results, that electrostatic effects can induce a strongly divergent density of states in bilayers and trilayers, reminiscent of…
LED는 고휘도 청색 칩의 개발로 인해 단순표시소자로만 이용되던 것이 다양한 분야의 발광소자로 적용되기 시작하였다. 특히, 최근에 InGaN 칩과 황색 형광체(YAG:Ce3+)를 이용한 방법이 많이 연구되어지고 있다. 하지만 이 방법은 2 파장을 이용한 것으로 색연지수가 낮은 단점을 지니며, 황색의 YAG:Ce3+ 형광체 이외에 450~470 nm의 여기 영역에서 효율적으로 발광하는 형광체가 거의 없다. 따라서 본 연구에서는 장파장 영역의 여기 특징을 지닌 thiogallate 형광체의 합성을 시도하였다. 그 중에 가장 잘 알려진 SrGa2S4:Eu2+ 형광체의 모…
We report on investigation of photoalignment of cholesteric liquid crystal on phenylone-based photosensitive material as aligning layer. We found that reflective and electro-optical characteristics of cholesteric cells strongly depended on the dose of irradiation of a photoaligning layer with polarized UV light. Irrad…
The structure of Rna1p was originally solved to 2.7 A resolution by MIRAS from crystals with partial hemihedral twinning in space group I4(1) [Hillig et al. (1999), Mol. Cell, 3, 781-791] by finding a low-twinned native crystal (twin fraction alpha=0.06) and after twin correction of all data sets. Rna1p crystals have…
<TEX>$Y_2O_2S$</TEX>:Eu phosphors were synthesized via solid-state reactions. <TEX>$Y_2O_2S$</TEX>:Eu phosphor particles of various sizes were obtained by varying the firing temperature and firing time. The photoluminescence properties of these <TEX>$Y_2O_2S$</TEX>:Eu phosphors were examined. In addition, the cathodol…
Precipitation of δ phase during solid-state diffusion bonding of Inconel alloy 718 to itself was studied in the present investigation. The joining was carried out from 910 to 1060°C, in steps of 30°C, with time and pressure fixed at 60 min and 32 MPa, respectively. In the joint bonded at 910°C, transforming of γ″ to δ…
Porous cobalt nanowall arrays have been prepared by electrochemical deposition of mono-precursor [Co(NH(3))(5)Cl]Cl(2) on copper substrates. Brunauer-Emmett-Teller (BET) and Barret-Joyner-Halenda (BJH) investigations of the surface properties indicate that the resulting porous nanomaterials possess high surface area a…
We investigate the role of disorder in the Mott-Hubbard transition based on the slave-rotor representation of the Hubbard model, where an electron is decomposed into a fermionic spinon for a spin degree of freedom and a bosonic rotor (chargon) for a charge degree of freedom. In the absence of disorder, the Mott-Hubbar…
Carbon nanotubes were discovered in 1991 as a minor by-product of fullerene synthesis [1]. Remarkable progress has been made in the ensuing 14 years, including the discovery of two basic types of nanotubes (single-wall and multiwall); great strides have been taken in their synthesis and purification, elucidation of th…
We have developed a new guest-host reflective display using a dye-doped dual-frequency liquid crystal (DFLC) gel. By combining dye absorption and maximal light scattering, the display is polarization independent and exhibits a high contrast (∼ 230:1). The high reflectivity (R ∼ 50%) is because of the vertical aligned…
Time-resolved fluorescence and transient absorption results have been obtained for small (approximately 3 nm) and large (approximately 5-8 nm) InSe nanoparticles in room-temperature solutions. The large particles are nonfluorescent, indicating that the conduction band is at M and the optical transition is forbidden. F…
The dynamics of nanostructured surface phases on SrTiO(3)(001) have been analysed using in situ scanning tunnelling microscopy (STM) above 800 degrees C. During high-temperature annealing, the formation, growth and ordering of the nanostructures has been observed. Dilines, with a width of approximately 1 nm, are forme…
Primary objective. Elevation of the thrombotic responses mediated by a variety of carbon-derived nanoparticles was recently reported in the literature. In this paper our objective was to investigate whether metal nanoparticles (iron, copper, gold or cadmium sulfide [CdS]) impart such prothrombotic effects on human pla…
A Comment on the Letter by Zoran S. Popovi\ifmmode \acute{c}\else \'{c}\fi{}, Zeljko V. \ifmmode \check{S}\else \v{S}\fi{}lijivan\ifmmode \check{c}\else \v{c}\fi{}anin, and Filip R. Vukajlovi\ifmmode \acute{c}\else \'{c}\fi{}, Phys. Rev. Lett. 93, 036401 (2004).. The authors of the Letter offer a Reply.
Using the superheating method [Luo et al., Phys. Rev. B68, 134206 (2003)], we deployed classical molecular dynamics (MD) simulation to compute solid-liquid interfacial tension of silicon. We performed isobaric-isothermal MD simulation on two silicon models, the Stillinger-Weber [Phys. Rev. B31, 5262 (1985)] and Tersof…
Flash-freezing is a technique that is commonly used nowadays to collect diffraction data for X-ray structural analysis. It can affect both the crystal and molecular structure and the molecule's surface, as well as the internal cavities. X-ray structural data often serve as a template for the protein receptor in dockin…