Materials Literature
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The degradation of 4-chlorophenol with near-UV light by silica-immobilized polyoxometalate (POM-in-SiO2) catalysts has been studied. The silica-immobilized Na6W7O24 (SW7), H4W1032 (SW10), H3PW12O40 (SPW12), and H6P2W18O62 (SP2W18) were prepared by means of the sol-gel hydrothermal technique through the hydrolysis of t…
Positively and negatively charged nanoparticles have been mixed together in order to obtain superlattice formation. The interaction between the particles was controlled by adjusting the ionic strength of the solutions. The self-assembly was studied with absorption spectroscopy, powder X-ray diffraction, and high-resol…
Multi-dithienylethene arrays, in which two, three, or four 1,2-bis(2,4-dimethylthiophen-3-yl)perfluorocyclopentenes are ethynylene-bridged, were synthesized. Upon irradiation with ultraviolet light the hexane solutions of the arrays turned violet-blue and the color disappeared by irradiation with visible light. The qu…
Nanocrystalline Ti x Fe y Ru z O n materials were prepared by mechanical alloying using high-energy ball milling. The electrochemical properties of the materials were investigated in 1 M NaOH and 1 M H 2 SO 4 aqueous solutions, using a composite electrode technology. The tested materials fall in two categories. On one…
A large area and controllable synthesis of well-aligned CN x nanotubes with a high content of nitrogen (x⩽9%) was carried out by pyrolyzing metal phthalocyanine on an n-type Si(100) substrate. The diameters of the CN x nanotubes range widely from 20 to 200 nm, and the lengths range from 1 to 100 μm. The impressive bam…
It is shown that, during the preparation of Cu/SiO 2 samples by selective adsorption of copper tetraammine complex [Cu(NH 3 ) 4 (H 2 O) 2 ] 2+ on silica, two types of supported Cu II species form: grafted Cu II ions and copper phyllosilicate. The formation of grafted Cu II ions results from electrostatic adsorption of…
Nanocrystalline ZnS and CdS samples have been synthesized in the presence of Eu 3+ and Tb 3+ using various techniques (precipitation in water, methanol, or toluene and inverse micelle techniques) which have been reported to yield ZnS or CdS nanoparticles doped with luminescent rare earth ions. Nanocrystalline particle…
In recent years, many soft-chemical reactions of layered perovskites have been reported, and they can be classified into sets of similar reactions. Simple ion-exchange and intercalation reactions replace or modify the interlayer cations of layered perovskites, and more complex metathesis reactions replace interlayer c…
We propose a method for analysing the dynamics of systems exhibiting slow relaxation, which is based on mesoscopic non-equilibrium thermodynamics. The method allows us to obtain kinetic equations of the Fokker-Planck type for the probability functional and their corresponding Langevin equations. Our results are compar…
Abstract The adsorption of binary thiophene‐containing mixtures on activated carbon and their subsequent desorption and oxidation over a Pd/CeO 2 /Al 2 O 3 catalyst has been studied as a model for the treatment of dilute VOC streams by intermittent accumulation and combustion. When adsorbed together, cyclohexene and t…
The electrostatic repulsive force between particles impacts the static structure of colloidal systems and dramatically hinders visible light scattering. In this investigation, we employed frequency domain photon migration (FDPM) to measure the isotropic scattering coefficients of dialyzed polystyrene latex suspensions…
Optical reflectivity studies have been conducted upon thin free-standing films of an antiferroelectric liquid crystal possessing the bulk phase sequence $\mathrm{Sm}{C}_{A}^{*}\ensuremath{-}\mathrm{Sm}{C}_{\ensuremath{\alpha}}^{*}\ensuremath{-}\mathrm{Sm}A.$ Electrically induced field independent and field dependent s…
Shape memory alloys (SMAs) are being embedded in or externally attached to smart structures because of the large amount of actuation deformation and force that these materials are capable of producing when they are heated. Previous investigations have focused primarily on using single or opposing SMA wires exhibiting…
Using a recently developed photopyroelectric ac calorimetric technique we investigate two binary liquid crystal mixtures with so-called injected smectic-A phases. Characteristic of these systems is the occurrence of nematic-to-smectic-A transition lines in the phase diagram of mixtures of pure compounds having only a…
We study at- and out-of-equilibrium dynamics of a single homopolymer chain at low temperature using molecular dynamics. The main quantities of interest are the average root mean square displacement of the monomers below the theta point, and the structure factor, as a function of time. The observation of these quantiti…
Cancrinite crystals possessing parallel nanochannels are attractive for incorporation of guest materials and preparation of one-dimensional structures. In this work, we study variety of cancrinite crystals synthesized with Se inside their channels. Single crystal x-ray diffraction, polarized Raman, optical absorption,…
The hydrothermal reactions of zinc oxide, phosphoric acid, sodium orthovanadate, and the appropriate polyimine ligand at 200 °C for 95, 68, and 42.5 h, respectively, have yielded three novel compounds, [Zn(bpy)(VO2)(PO4)] (1), [Zn(terpy)(VO2)(PO4)] (2), and [Zn(o-phen)(ZnVO)(PO4)2] (3). Compounds 1 and 2 are both one-…
We have examined the structures of surfactant self-assemblies left on substrates as a contact line spontaneously retreats across the surface during an autophobing event. A continuous structural gradient is formed during the spontaneous retreat: from molecules lying down on the surface with low packing densities in a r…
Anion ligands-preserved cationic giant Pd clusters were prepared by treatment of palladium carbonyl acetate cluster, Pd 4 (CO) 4 (OAc) 4 ·2AcOH (PCA), with metal nitrates, e.g. Cu(NO 3 ) 2, and Fe(NO 3 ) 3, in the presence of 1,10-phenanthroline (phen). Extensive characterization of the Pd clusters was made by XRD, XP…
Gold nanoparticle I and nanoparticle II protected by 10-(1-pyrenyl)-6-oxo-decanethiol and 17-(1-pyrenyl)-13-oxo-heptadecanethiol, respectively, were prepared and characterized by 1 H NMR, FT-IR, XPS, UV−vis and fluorescence spectroscopies and TEM and elemental analysis. Their compositions were determined to be (C 25 H…