Materials Literature
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This article deals with the cold plasma treatment of atactic polystyrene (aPS) and isotactic polystyrene (iPS) thin films with oxygen, oxygen-nitrogen mixture or nitrogen. Experimental results showed that the use of a DC pulsed plasma discharge at low pressure can considerably increase surface hydrophilicity. Variatio…
Abstract For Abstract see ChemInform Abstract in Full Text.
A highly homogeneous and dispersed K-Co-Mo/C catalyst which prepared by a sol-gel method exhibits high alcohol yield, especially high C2+ OH selectivity for mixed alcohol synthesis from CO + H2.
Treatment of [Ti(O-i-Pr)(2)Cl(2)] with NaL(OEt) (L(OEt)(-) = [CpCo[P(O)(OEt)(2)](3)](-), Cp = eta(5)-C(5)H(5)) afforded [L(OEt)Ti(O-i-Pr)(2)Cl] that reacted with HCl in ether to give [L(OEt)TiCl(3)] (1). The average Ti-O and Ti-Cl distances in 1 are 1.975 and 2.293 A, respectively. Reaction of titanyl sulfate with NaL…
Sb K-edge extended x-ray-absorption fine-structure spectroscopy has been used to determine the coordination environment of ${\mathrm{Sb}}^{3+}$ ions in a wide range of ${\mathrm{Sb}}_{2}{\mathrm{O}}_{3}{\ensuremath{-}M}_{x}{\mathrm{O}}_{y}$ glasses $(M=\mathrm{Si},$ Ge, B, and As) with ${\mathrm{Sb}}_{2}{\mathrm{O}}_{…
The composition dependence of the optical and structural properties of Ge1-xSix nanocrystals is investigated by means of ab initio total-energy and electronic-structure calculations. A trimodal distribution of the Ge-Ge, Ge-Si, and Si-Si bond lengths is found. The pair-excitation energies and the Stokes shift are calc…
High yields (typically 95%) of highly ordered cubic (rhombic dodecahedral) crystals of MCM-48 mesoporous silica can be obtained from simple cetyltrimethylammonium hydroxide (CTAOH)–SiO2–H2O systems in which the CTAOH functions as the structure director and also controls the pH of the synthesis gel.
The importance of cooperative interaction has been pointed out in the spin crossover phenomena. Sorai and co-workers have proposed a so-called domain model, in which the degree of correlation is expressed by a phenomenological parameter characterizing the sharpness of the transition. Wajnflasz has introduced a pioneer…
The kinetics of isothermal crystallization at the free surface of dense, 150–1050 bilayer (BL) (∼55–385 nm) thick amorphous solid water (ASW) films is investigated experimentally, and a model accounting for the observed thickness dependence is proposed. We find that as the ASW film thickness is increased above 150 BL,…
The sol–gel method has been used to entrap photochromic naphthopyran molecules in ormosil coatings. The resulting films exhibited a rapid and reversible color change upon irradiation with UV light, leading to deeply colored coatings. The bleaching of the samples can be attained by both thermal and photo-induced proces…
We consider colloidal particles clothed each by f end-grafted polymer chains, and immersed in a good solvent. The clothed particles are small enough to be regarded as star polymers. The purpose is a quantitative study of the influence of the confinement on the expression of the effective force between a pair of partic…
Abstract For Abstract see ChemInform Abstract in Full Text.
The equilibrium vapor pressures over GdCl 3, GdBr 3, α-GdI 3, TbCl 3, TbBr 3, and α-TbI 3 were measured by the torsion-effusion method. The obtained data are well represented in the covered temperature ranges by the following selected equations: Considering the vapor consists only of the monomeric form, by the second-…
Abstract The structural properties of normal‐type spinel ZnCr 2 Se 4 have been studied as a function of temperature by means of X‐ray diffraction using synchrotron radiation. It is found that a structural phase transition from cubic to orthorhombic symmetry occurs at 22.5 K ( T c ). It is also found that, below T c ,…
Structural and electronic properties of co-sputtered Ni-Mg thin films with varying Ni to Mg ratio were studied by in situ x-ray absorption spectroscopy in the Ni L-edge and Mg K-edge regions. Codeposition of the metals led to increased disorder and decreased coordination around Ni and Mg compared to pure metal films.…
We propose and demonstrate a new computational approach which enables the simulation of the dynamics and rheology in inhomogeneous phases of multicomponent polymeric systems. Our approach generalizes Doi’s dynamical mean-field theory of rodlike polymers by combining single chain Brownian dynamics algorithms with pheno…
The effects of radial deformation and single vacancy on the electronic properties of a single-wall carbon nanotube are studied through ab initio method. Different paths are considered: the tube is deformed and subsequently a vacancy is produced, or a vacancy is created and the tube is deformed later. The involved ener…
The pressure−volume−temperature ( PVT ) dependence of commercial poly-ε-caprolactam melt (PA-6) and based on it a nanocomposite containing 1.6 wt % of exfoliated montmorillonite (PNC) as well as their 1:1 mixture was determined at T = 300−560 K and P = 0−150 MPa. Incorporation of clay into PA-6 resulted in lowering th…
Pressure-volume-temperature measurements were carried out on two van der Waals liquids, 1,1′-bis(p-methoxyphenyl)cyclohexane (BMPC) and 1,1′-di(4-methoxy-5methylphenyl)cyclohexane (BMMPC). In combination with dielectric spectroscopy results, the relative contribution of temperature and density to the structural relaxa…
A convenient synthetic route to 1,4-bis(tert-butoxycarbonylmethyl)tetraazacyclododecane (cyclen) (1) with high yield and excellent regioselectivity is described. Compound 1 reacted with a range of functionalized alkyl halides under two reaction conditions to give mono-N-alkylated 1,4-bis(tert-butoxycarbonylmethyl)tetr…