Materials Literature
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In polymernanoparticle composites, uniform dispersion of the nanoparticles carries advantages over cases where nanoparticle aggregation dominates. Such dispersion has been particularly difficult to obtain in the case of composites prepared from nanoparticles and conjugated polymers. Here, we show that cadmium selenide…
MoS 2 nanostructures including hollow-cage fullerene-like particles, fibrous floccus, and spherical nanovesicles have been successfully synthesized by designed solution chemical reactions of Na 2 MoO 4 and sulfurization reagents such as CS 2, Na 2 S, CH 3 CSNH 2, CSN 2 H 4, and KSCN etc. Possible redox reaction routes…
Molecular sensors based on scattering spectroscopy of single gold nanoparticles can be improved three-fold by the use of gold nanoshells instead of solid gold nanoparticles. The particle plasmon resonance responds more sensitively to changes in the environment, the biological spectral window is accessible, and the sca…
기존의 <TEX>$SrGa_2S_4:Eu^{2+}$</TEX> 녹색 발광 형광체는 주로 CRT (Cathode Ray Tube)용이나 FED (Field Emission Display), 그리고 EL (Electroluminescence)용 발광소자로 많이 연구되어졌다. 현재는 장파장 영역의 여기 특성을 이용한 LED (Light Emitting Diode)용 형광체로 주목 되어지고 있다. <TEX>$SrGa_2S_4:Eu^{2+}$</TEX> 형광체의 일반적 합성 방법은 Flux를 이용하여 인체에 유해한 <TEX>$H_2S$</TEX>나 <TEX>$CS_2$</T…
두개의 sulphato로 다리걸친 착물 <TEX>$[Cr_2(NH_2)_2(H_2O)_2(SO_4)_2]{\cdot}2H_2O$</TEX>, 말단 3개의 isocyanato <TEX>$[Cr(NCO)_3(H_2O)]{\cdot}3H_2O$</TEX> 화합물과 갈철광 <TEX>$[FeO(OH)]{\cdot}0.2H_2O$</TEX> 화합물들은 각각의 <TEX>$Cr_2(SO_4)_3{\cdot}xH_2O, Cr(CH_3COO)_3, Fe_2(SO_4)_3$</TEX>과 <TEX>$80^{\circ}C$</TEX>, 수용액에서 요소와 반응으로 합성되었다. 생성물들의 I…
Eine Frage des Alterns: Alkylamin-Template wirken als bifunktionelle Tenside beim Aufbau von Mesostrukturen mit mikroporösen Wänden. Je nach Alterungsbedingungen wurden aus Eisen(III)-ethoxid in Gegenwart von Decylamin mesoporöse hexagonale zweidimensionale Eisenoxid-Strukturen mit P6mm-Symmetrie und kubische dreidime…
Heat transfer characteristics of nanofluids in an acoustic cavitation field have been investigated experimentally. The effects of acoustical parameters, nanofluids concentration, and fluid subcooling on heat transfer are determined in detail. Results show that acoustic cavitation and nanometer particles have a profoun…
A novel depolarization method for linearly polarized incident light that uses a liquid-crystal (LC) cell with randomly aligned hybrid orientation domains is theoretically described by use of Mueller matrix calculations. The depolarization effect of the incident linear polarization is confirmed with Stokes parameter me…
The effect of the electric current on the charge-ordered state in ${\mathrm{La}}_{5∕8\ensuremath{-}y}{\mathrm{Pr}}_{y}{\mathrm{Ca}}_{3∕8}\mathrm{Mn}{\mathrm{O}}_{3}$ $(y=0.35)$ manganite is investigated by means of in situ measurements of the temperature dependence of internal friction ${Q}^{\ensuremath{-}1}(T)$, Youn…
Atomistic simulations are performed to investigate the mechanical properties of uniaxial tensile and bending behaviours of double-walled carbon nanotubes. The second-generation reactive empirical bond-order potential and four different van der Waals (vdW) potentials are used to describe bonding and non-bonding atomic…
In contrast to classic ZTE materials (ZTE=zero thermal expansion), the ZTE effect in YbGaGe (see crystal structure) is caused by the change in the valency of the ytterbium ion from +2.6 to +2 with decreasing temperature. This change in the valence state compensates for the contraction of the net as the temperature dec…
Atom-transfer radical polymerization (ATRP) of acrylates from the initiator-modified zinc phthalocyanine yielded amphiphilic, phthalocyanine-terminated polymers with a narrow molecular-weight distribution. The disklike phthalocyanine moiety was incorporated into one end of the polymer chain. We investigated the aggreg…
A subject of great practical importance that has not received much attention is the question of the sensitivity of molecular dynamics simulations to the initial X-ray structure used to set up the calculation. We have found two cases in which seemingly similar structures lead to quite different results, and in this art…
5,10-Diphenyl-15,20-di(4-methoxyphenyl)-21-telluraporphyrin ( 7 ) was prepared in 18% yield by the p -toluenesulfonic acid-catalyzed condensation of 2,5-bis(1-phenyl-1-hydroxymethyl)tellurophene ( 6 ), pyrrole, and 4-methoxybenzaldehyde in carefully deoxygenated CHCl 3 followed by oxidation with p -chloranil. While 1…
Gold nanoparticles offer tremendous potential in the areas of nanoelectronics, bio- and chemosensors, and catalysis. However, before these applications are realized, the surface functionality of nanoparticles must be better controlled. Our lab has recently reported a novel synthetic approach for making monofunctionali…
A tricontinuous (10,3)c network phase is documented in a poly(cyclohexylethylene-b-ethylethylene-b-ethylene) triblock copolymer melt based on small-angle x-ray scattering. Application of shear transforms the self-assembled soft material into a single crystal (10,3)d network while preserving the short-range threefold c…
Natural systems excel in directing the synthesis of inorganic materials for various functional purposes. One of the best-studied systems is silica synthesis, as occurs in diatoms and marine sponges. Various biological and synthetic polymers have been shown to template and catalyze silica formation from silicic acid pr…
The hexagonal-channeled layer phase (ChLhex; see picture, right) is one of the new liquid-crystalline phases formed by the self-organization of the rigid rodlike alkali-metal carboxylates shown.
We have prepared polycrystalline samples of Yb-Nb-S-based misfit-layered compound and measured their thermoelectric properties below 300 K. The compound consists of an alternate stacking of a trigonal prism (MoS 2 )-type [NbS 2 ] layer and a two-layered rock-salt-type [Yb 1.90 S 2 ] slab, being incommensurate parallel…
To have a clear insight into the diamond nucleation upon the hydrothermal synthesis and the reduction of carbide (HSRC), we performed the thermodynamic approach on the nanoscale to elucidate the diamond nucleation taking place in HSRC supercritical-fluid systems taking into account the capillary effect of the nanosize…