Materials Literature
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Neutral amines-templated mesoporous silica systems impregnated with Reichardt's dye are pink in color if previously dehydrated and white if still covered with hydroxyls: the pink coloration is, however, reversibly restored by exposing the latter sample only to NH 3 and amines. The mechanism of color change is discusse…
X7R‐type BaTiO 3 materials were analyzed using X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Powder XRD indicated that the materials had pseudocubic lattices, but core–shell grain structures predominated in bright‐field (BF) TEM images. Electron diffraction patterns across the core–shell boundari…
Abstract The title compound [Bi(OSi t BuPh 2 ) 3 ] ( 1 ) was prepared by the reaction of [Bi(O t Bu) 3 ] with t BuPh 2 SiOH in toluene at room temperature. The compound crystallizes in the monoclinic space group P 2 1 /n with the lattice constants a = 17.610(1), b = 20.153(1), c = 26.655(1) Å and β = 105.503(3)°. In t…
Two phenylpropanoids from Bupleurum fruticosum (Apiaceae/Umbelliferae) were shown to inhibit the transcriptional activity induced by PMA or TNFα of an NF-κB-controlled reporter gene. Western blot experiments indicated that the phenylpropanoids did not prevent IκBα degradation, suggesting that their molecular target is…
Europium-doped yttrium oxide (Y2O3:Eu3+) nanophosphors were synthesized by wet chemical routes with both combustion and coprecipitation techniques. We explicitly illustrate the dynamics of Y2O3:Eu3+ nanophosphors with a particle size that is influenced by extrinsic stress and revealed by x rays and Raman scattering. T…
This paper presents results on the flashover of ice-covered insulators at low air pressure. The flashover performance of two different types of insulators covered with polluted ice was experimentally determined and the effects of several determining factors, such as the air pressure, ice severity, and pollution rate,…
Single-molecule (SM) spectroscopic methods were employed to study single site variations in the acidity properties of sol-gel-derived silicate films. The pH-sensitive dye Carboxy SNARF-1 (C.SNARF-1) was used to sense film acidity. Its concentration in the films was maintained at nanomolar levels to allow for SMs to be…
Roll drafting is a mechanical operation that is indispensable when manufacturing staple yams. However, a fiber bundle throughout this operation has a certain number of defects in its regularity of linear density, causing many problems not only for the quality of the textile product but also for the efficiency of the m…
We report theoretical calculations of the magnetoelectric properties in a three-phase multiferroic particulate composite of Terfenol-D, lead-zirconate-titanate (PZT), and polymer based on the Green's function technique. Our results show that the values of the magnetoelectric voltage coefficients are very sensitive to…
We investigate the impact of water on the optical absorption of prototypical silicon clusters. Our clusters contain 5 silicon atoms, tetrahedrally coordinated and passivated with either hydrogen or oxygen. We approach this complex problem by assessing the contributions of three factors: chemical reactivity, thermal eq…
Metal substituted octachloro-, hexadecachloro- and tetranitrophthalocyanine were synthesized by exposure to microwave irradiation under solvent free and reflux conditions and the products were purified by a new route.
Abstract New bifunctional catalysts composed of PdCl 4 2− , OsO 4 2− and OsO 4 2− , WO 4 2− designed and prepared by a counterionic stabilization technique involving the reactions of Na 2 PdCl 4 ‐K 2 OsO 4 and K 2 OsO 4 ‐Na 2 WO 4 with nanocrystalline MgO are well characterized. These bifunctional catalysts, NAP‐Mg‐Pd…
Response function measurement of layered-type chemical vapor deposition single crystal diamond radiation detectors for 14 MeV neutrons was carried out. The detector had a layered structure that was composed of a boron-doped diamond layer of 0.5 μm in thickness and a nondoped diamond layer of 20 μm on an inexpensive hi…
Vilsmeier formylation is one of the most widely used substitution reactions for the functionalization of porphyrins. However, its utility is limited by the electrophilic/acidic reaction conditions, deactivation of the aromatic system and regiochemical problems, the requirement for metal complexes and necessity for sub…
We demonstrate the crystallization of a membrane protein using femtosecond laser irradiation. This method, which we call the laser irradiated growth technique (LIGHT), is useful for producing AcrB crystals in a solution of low supersaturation range. LIGHT is characterized by reduced nucleation times. This feature is i…
The initial steps toward a miniature, field portable sensor based on surface-enhanced Raman spectroscopy (SERS) are presented. It is demonstrated that a low-cost miniaturized Raman system can be used in place of a larger, higher-cost conventional Raman system. This system was developed by sequentially replacing compon…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTBridge to Loop Transition in a Shear Aligned Lamellae Forming Heptablock CopolymerLifeng Wu, Timothy P. Lodge, and Frank S. BatesView Author Information Department of Chemical Engineering and Materials Science and Department of Chem…
Mineral crystals in biological materials such as bone, tooth, and sea shell are susceptible to buckling under compressive loading due to their slender geometry with large aspect ratios. How does nature deal with this problem? This question is especially interesting in view of the three orders of magnitude difference i…
Dielectric response of epitaxial thin films of perovskite ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3},x=0$, 0.2, 0.6, was experimentally studied as a function of temperature, frequency, and amplitude of ac electric field. Decrease of temperatures of dielectric maxima ${T}_{m}$ with respect to…
Ceramic composites with the composition of x PMZNT·(1 – x )NiCuZn have been prepared using a standard ceramic technique, in which x varies as 0, 0.1, 0.2, 0.4, 0.6, 0.9, and 1.0. PMZNT is the abbreviated form of 0.92Pb(Mg 1/3 Nb 2/3 )O 3 ·0.04Pb(Zn 1/3 Nb 2/3 )O 3 ·0.04PbTiO 3 (PMN‐PZN‐PT). NiCuZn is the abbreviated f…