Materials Literature
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We report here the first electrochemical oxidation−reduction cycle procedure to roughen gold substrates in 0.1 N HCl aqueous solution containing 1 mM rutile TiO 2 nanoparticles under the irradiation of UV light. It is encouraging to find that the oxidized peak in the anodic scan, which is responsible for the surface-e…
A new category of gels where gelification and breaking of the gels are chemically induced is presented. In particular, the latent gellant polyallylamine produced stable gels with some organic solvents after reaction with CO2 at room temperature, giving the gellant polyallylammonium carbamate. The rheological behavior…
This paper reviews the impact of scaling on the system performance of mechanical inertia sensors. Permanent cost pressure will result in continuous efforts to integrate more functions into further miniaturized systems. As a consequence microsystems (MEMS) will also incorporate functional nano devices such as carbon na…
In-situ near-infrared (NIR) spectroscopy was used to simultaneously measure the sorption of high-pressure CO 2 and the swelling of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG). NIR spectroscopy in transmission mode allowed us to measure the sorption of CO 2 using its combination bands and follow the sw…
The influence of π-stacking on photoinduced electron transfer in a series of donor−acceptor molecules attached to a 3-fold symmetric scaffold was studied. The donor−acceptor unit is a DEA−PDI pair (DEA = N,N -diethylaniline; PDI = perylene-3,4:9,10-bis(dicarboximide)), in which the 4-position of DEA is covalently atta…
Chiral biomolecules conjugated with silver nanoparticles were investigated by circular dichroism (CD) spectroscopy. Silver nanoparticles were prepared by the citrate reduction method and were characterized by UV spectroscopy and TEM. Conjugation of thiol group-containing biomolecules, such as cysteine, glutathione and…
By use of density-functional theory we analyze the on-surface adsorption of oxygen on Pd(111) for coverages up to 1 monolayer and compare the results with corresponding data for the other late 4d transition metals, namely, Ru, Rh, and Ag. Besides the known effect of the continued d- band filling on the oxygen−metal bo…
Epoxy-OM (organo-montmorillonite) nanocomposites have been synthesized, and their permeability to oxygen and water vapor has been measured. The chemical structure of the organic monolayer ionically bonded to the montmorillonite surface has been varied, and its influence on the swelling, intercalation, and exfoliation…
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…