Materials Literature
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Poly(2-ethynylthiophene) was stereoregularly prepared with a Rh complex catalyst, [Rh(norbornadiene)Cl] 2, to selectively produce the cis−transoid isomer in high yields when triethylamine was used as the polymerization solvent at 20 °C. Photoinduced cis-to-trans isomerization was newly found to take place when the fil…
5-[[[2‘,5‘-Bis[(4‘ ‘- n -((perfluoroalkyl)alkoxy)benzoyl)oxy]benzyl]oxy]carbonyl]bicyclo[2.2.1]hept-2-enes with short fluorocarbon segments were polymerized by ring-opening metathesis polymerization in THF at room temperature using Mo(CHCMe 2 Ph)(N-2,6- i Pr 2 Ph)(O t Bu) 2 as the initiator. Although hydrocarbon and f…
The electronic structure of the blue-copper site of Pseudomonas aeruginosa azurin has been investigated by ab initio multireference determinantal configuration interaction (MRD-CI) calculations. A truncated site consisting of copper and its three equatorial ligands has been studied with emphasis on the g tensor and th…
Multiple experiments (17O NMR, 1H NMR, and EPR) have been performed in the past to understand the microscopic parameters that control the magnetic relaxation rate enhancement induced by paramagnetic molecules on neighboring water protons, the so-called relaxivity. The generally accepted theories of the electron spin r…
This paper describes the use of dendritic polyglycerol as a new high-loading polymeric support. The soluble polyether skeleton allows the parallel synthesis of small libraries on a large scale (1-5 mmol). Purification of polymer-bound products is easily achieved by a parallel dialysis apparatus, which was developed to…
Single-walled carbon nanotubes can exist in chiral forms and can adsorb a range of molecules. We use atomistic simulations to consider whether enantiopure carbon nanotubes might be effective enantiospecific adsorbents for chiral molecules. We examine the adsorption of both enantiomers of trans-1,2-dimethylcyclopropane…
The processes occurring during annealing of particulate ZnO thin films and powders are examined in detail by size-determining methods (TEM and powder X-ray diffraction) and by thermal analysis. Water and carbon dioxide desorb from the surface at temperatures of about 100 °C. At higher temperatures (between 300 and 500…
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…