Materials Literature
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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…
Abstract A series of hybrid polyimide–silica hybrids films were prepared by a sol–gel process via the blending of tetrathoxysilane and a coupling reagent in a pyromellitic anhydride/4,4′‐oxydianiline (ODA) based poly(amic acid) solution in N , N ‐dimethylacetamide, the casting of the films, the evaporation of the solv…
Kinetics, Transport, and Structure in Hard and Soft Materials is the only single reference that discusses the connection between structure and mechanisms of atomic or molecular transport in different classes of materials, from metals and semiconductors to network glasses, polymers and supercooled liquids. Divided into…
The influence of oxygen and polymer concentration on the quenching of the photoluminescence (PL) from a water-soluble conjugated macromolecule, sodium poly[2-(3-thienyl)ethyloxy-4-butylsulfonate)] (PTE-BS), was investigated. The presence of oxygen in the polymer solution decreases the photoluminescence by 6.4%. The sh…
Equilibrium adsorption isotherms for low-volatile compounds are extremely difficult to measure. A simple technique using temperature programmed desorption (TPD) is proposed. It is demonstrated that the two parameters needed for constructing the Langmuir isotherm can be derived with data from the TPD technique alone. T…
We report on the spectroscopic investigation of ${\mathrm{Pr}}^{3+}$-doped binary, ternary, and quaternary fluoride compounds exhibiting photon cascade emission. Under vacuum-ultraviolet synchrotron excitation at wavelengths below 200 nm in the $4f5d$ bands of the ${\mathrm{Pr}}^{3+}$ ion the emission spectra show int…
Some operating buried transmission pipeline systems will develop unforeseen surface corrosion. Electrochemical corrosion behavior of low carbon line pipe steel in NS4 soil test solution has been investigated by EIS method. Corrosion phenomenon is accentuated by influence of such soils parameters as specific resistance…
Abstract A thin, highly crosslinked layer was grafted onto an alkyl thiol self‐assembled‐monolayer (SAM)‐coated gold surface with N,N ′‐methylene bisacrylamide (MBAA), a widely used crosslinker with two polymerizable groups, as the monomer. Surface‐initiated photografting copolymerization was achieved through the immo…
Nanometer-sized coaxial cables with a single-crystal ZnS core and a thin amorphous SiO2 shell were synthesized by simple thermal evaporation in vacuum. As-fabricated ZnS/SiO2 nanocables were studied using scanning electron microscopy, x-ray diffraction and transmission electron microscopy. The ZnS/SiO2 nanocables have…