Materials Literature
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Optical properties of nanocrystalline red-emitting phosphor, europium-doped yttria (Y2O3:Eu3+), of average particle size of 15nm are investigated. The intensity of the strongest emission line at 612nm is found to be highest in the nanocrystalline sample with 4at.wt% of europium. The narrow electronic emission spectrum…
There are many methods for analyzing solid-state kinetic data. They are generally grouped into two categories, model-fitting and isoconversional (model-free) methods. Historically, model-fitting methods were widely used because of their ability to directly determine the kinetic triplet (i.e., frequency factor [A], act…
We have identified, for the first time, the change in symmetry at the ferroelectric transition TFE near 1023K of the ferroelectromagnet YMnO3. This transition takes place 300K below the transition to the centrosymmetric state at TIP. Single crystal synchrotron diffraction coupled to a group theoretical analysis show t…
Large-scale alignment of lamellae in thin films of diblock copolymers containing polyacrylonitrile and poly(n-butyl acrylate) was achieved by casting copolymer solution on a silicon substrate moved away at a constant speed from the casting nozzle (zone-casting). Grazing incidence small-angle X-ray scattering revealed…
One ligand, five NIR-emitting complexes: Tropolonate (trp) ligands sensitize the near-infrared emission of several lanthanide (LnIII) ions upon formation of [Ln(trp)4]− complexes (Ln=Nd, Ho, Er, Tm, and Yb; see emission spectra). The solid-state structures and solution-state photophysical properties of the [Ln(trp)4]−…
Crystallization of the thermodynamically metastable β glycine is explained on the basis of its growth at the opposite poles of the crystal (see graph) and by considering the structure of the relevant surfaces of the three polymorphs and their interactions with solvent molecules.
Frequency-resolved femtosecond transient absorption spectra and kinetics measured by optical excitation of the second and first electronic transitions of the (8,3) single-walled carbon nanotube species reveal a unique mutual response between these transitions. Based on the analysis of the spectra, kinetics, and their…
Regenerated silk fibroin materials show properties dependent on the methods used to process them. The molecular structures of B. mori silk fibroin both in solution and in solid states were studied and compared using X-ray diffraction, FTIR, and (13)C NMR spectroscopy. Some portion of fibroin protein molecules dissolve…
We analyze the intrinsic geometric flexibility of framework structures incorporating linear metal--cyanide--metal $(\mathrm{M}\text{--}\mathrm{CN}\text{--}{\mathrm{M}}^{\ensuremath{'}})$ linkages using a reciprocal-space dynamical matrix approach. We find that this structural motif is capable of imparting a significan…
Thermolysis of benzoylacetonate complexes proved successful in the synthesis of rare-earth oxide nanocrystals. CeO2 nanopolyhedra, Eu2O3 nanodisks, and Pr2O3 nanoplates display 2D ordering on copper grids (see figure), and the former two show interesting optical properties arising from surface-modification effects.
Conjugated oligomers represent a prominent class of compounds from a viewpoint of their theory, synthesis, and applications in materials science. Push-pull substitution with an electron donor D at one end of the conjugation and an electron acceptor A at the other end results in them having outstanding optical and elec…
Recent theory has predicted a superlens that is capable of producing sub-diffraction-limited images. This superlens would allow the recovery of evanescent waves in an image via the excitation of surface plasmons. Using silver as a natural optical superlens, we demonstrated sub-diffraction-limited imaging with 60-nanom…
The structure of x MoO 3 ·(100-x)[2 P 2 O 5 · PbO ] glass system with 0≤x≤50 mol % is investigated by IR and Raman spectroscopies. The characteristic bands of the glass matrix [2 P 2 O 5 · PbO ] and MoO 3 oxide due to the stretching and bending vibrations are identified. This allows us to identify the specific structu…
The basic magnetic properties of Co–C60 and Fe–C60 nanocrystalline magnetic thin films and the temperature effects on these properties have been investigated. Experimental results show that the Co–C60 films possess an in-plane magnetic anisotropy, but such an anisotropy is not found in the Fe–C60 films. At room temper…
Escherichia coli pyridoxine 5'-phosphate oxidase (ePNPOx) catalyzes the terminal step in the biosynthesis of pyridoxal 5'-phosphate (PLP) by the FMN oxidation of pyridoxine 5'-phosphate (PNP) or pyridoxamine 5'-phosphate (PMP), forming FMNH(2) and H(2)O(2). The crystal structure of ePNPOx is reported in a tetragonal u…
Diblock copolymers with different poly(<TEX>$\varepsilon$</TEX>-caprolactone) (PCL) block lengths were synthesized by ringopening polymerization of <TEX>$\varepsilon$</TEX>-caprolactone in the presence of monomethoxy poly(ethylene glycol) (mPEG-OH, MW 2000) as initiator. The self-aggregation behaviors of the diblock c…
The elastic and piezoelectric constants of tungsten bronze ferroelectric crystals (Sr0.7Ba0.3)2NaNb5O15 (SBNN70) and (Sr0.3Ba0.7)2NaNb5O15 (SBNN30) are determined by using the ultrasonic and resonance methods. The measured results show that these single crystals have larger dielectric constant and good piezoelectric p…
The determination of protein structures on a genomic scale requires both computing capacity and efficiency increases at many stages along the complex process. By combining bioinformatics workflow-management techniques, cluster-based computing and popular crystallographic structure-determination software packages, an e…
요 약.CRT나 EL용 발광소자로 이용되는 Thiogallate 형광체는 장파장 영역에서 높은 광발광(Photoluminescence) 특성을 지니고 있는 것으로 보고되었다.이들 형광체 중에서 Ei产가 도핑된 CaGa2S4 형광체를 독성의 H?S나 CS, 기체를 사용하지 않고 5% Hj/95%N2의 혼합기체를 이용해 단순한 공정으로 제조하였다.이렇게 제조된 형광체는 기존의 YAG:Ce3+ 형광체와 비교하여 발광효율이
We study the mutual interactions of simple parallel polymers within the framework of density-functional theory (DFT). As the conventional implementations of DFT do not treat the long-range dispersion [van der Waals (vdW)] interactions, we develop a systematic correction scheme for the nonlocal energy contribution of t…