Materials Literature
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Mesoporous materials containing bridged cyclam moieties inside the framework were prepared by using a neutral templating route. Quantitative formation of bridged CuII-cyclam complexes was obtained by the direct incorporation of CuCl2 inside the hybrid material, showing thus the complete accessibility of cyclam moietie…
Hydrogen peroxide is generally considered to be a green oxidant, as it is relatively non-toxic and breaks down in the environment to non-toxic by-products. However, the current method for production, the sequential hydrogenation and oxidation of an alkyl anthraquinone, is capital-intensive, produces significant volume…
The temperature dependent thermoelectric power (TEP) of boron- and nitrogen-doped multiwalled carbon nanotube mats has been measured showing that such dopants can be used to modify the majority conduction from p-type to n-type. The TEP of boron-doped nanotubes is positive, indicating hole-like carriers. In contrast, t…
Abstract Because of their many unique and desirable properties, engineering polymers have increasingly been applied in applications where impact behavior is of primary concern. In this paper, the impact behavior of a glassy polymer acrylonitrile‐butadiene‐styrene (ABS) and a semicrystalline polymer alloy of polycarbon…
Incorporation of photochromic molecules into polymer matrices is necessary for materials applications such as optical information processing. Several novel homopolymers were prepared from 1,2-bis(3-thienyl)cyclopentene derivatives using ring-opening metathesis polymerization techniques. Analysis by UV−vis absorption s…
Neutral aluminum oxide clusters are produced in a molecular beam by laser vaporization in a pulsed-nozzle cluster source. These clusters are ionized via (multi-) photon absorption from either an ultraviolet excimer laser or from a far-infrared free electron laser. Ultraviolet (multi-) photon ionization produces sparse…
The third-order nonlinear optical properties of a series of 15 unmetallated and metallated 1,4,8,11,15,18,22,25-octaalkylphthalocyanines have been investigated. The palladium-metallated compound is the strongest nonlinear absorber of the series, but, due to its comparatively high linear absorption coefficient, it exhi…
Macroporous titania materials functionalized with monovacant Keggin-type polyoxometalates (POMs) [Xn+W11O39](12−n)− (XW11; Xn+ = P5+, Si4+, Ge4+) were prepared by the sol–gel as well as the template technique. Lacunary XW11 clusters were incorporated into wall structures of macroporous titania, resulting in the format…
Abstract Ordered macroporous materials recently have attracted much attention. A method that utilizes the condensation of monodisperse water droplets on a polymer solution is proposed for the preparation of honeycomb microporous films. Our results show that it is a general method that can be used for patterning a wide…
This paper discusses the occurrence of siderite (FeCO3) on iron artifacts excavated from the waterlogged peat and gyttja sediment of the Danish Iron Age site Nydam Mose. Siderite was identified by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with ene…
Pitting behavior in the presence of cathodic polarization was investigated using aluminum single crystals with surface orientations of (100), (110), and (111). The effects of the surface orientations on pit density, pit current density, and pit morphology were studied. In addition, the development of crystallographic…
Nanocrystalline cerium oxide films with grain sizes as small as 6 nm are deposited by anodic deposition. Cyclic voltammetry studies of a series of complexing ligands indicate that formation constants below and a solution pH between 7 and 10 are needed for film formation. A mechanism is proposed for the deposition of p…
As part of an ongoing effort to study the anion binding properties of sapphyrins in various media, a number of previously reported water solubilized sapphyrins were studied in methanol and in buffered, neutral aqueous solutions and found to undergo self-aggregation under these solution phase conditions. The nature of…
Lattice constants and thermal expansion of Ce 1 − y Gd y O 2 − 0.5 y − δ ( y = 0 , 0.1 , 0.2 ) in the temperature range 25-1000°C were estimated with high-temperature X-ray diffraction (HTXRD) while oxygen partial pressure varied in 10 − 20 to 10 5 Pa. Under oxygen partial pressures higher than 1 Pa, linear thermal ex…
The deformation behavior, i.e. the microstructure development and the deformation mechanisms in nitrogen alloyed ferritic-austenitic duplex stainless steels were studied by means of microstructure investigations and texture measurements in both phases. By comparison with corresponding single phase bcc and fcc material…
A novel room-temperature ionic liquid (RTIL),1-allyl,3-methylimidazolium chloride (［AMIM］Cl),was synthesized,ch aracterized and used for dissolving cellulose.The solubility of cellulose in ［ AMIM］Cl was better than in 1-butyl,3-methylimidazolium (［BMIM］Cl).The pris tine cellulose and two cellulose samples regenerated…
This paper describes a procedure for fast suppression of the phenomenon of ferroresonance in coupling capacitor voltage transformers (CCVT) without major change in the CCVT design. It is shown that it is possible to adjust parameters of the secondary overvoltage protection and the filter circuit so that the ferroreson…
Surface enhanced Raman scattering (SERS) was used to observe interactions of dilute solutions with silver and copper surfaces in situ . Using silver as a model surface which supports strong SERS with a 514.5 nm laser, it was possible to observe at the near monolayer level, and the spectra were compared to those from o…
Hydrogen content trapped by vanadium precipitates was evaluated using vanadium bearing martensitic steels which show single TDA desorption peak. The peak consists of desorption from various sorts of trap site with different detrapping activation energy, even if it appears to be a single peak. Experimentally obtained s…
The effects of low-molecular-weight oxidized materials generated by corona treatment on the adhesion properties of polypropylene (PP) film were investigated by adhering four different materials to the modified PP: a polyamide printing ink, vapor-coated aluminum, a synthetic-rubber pressure-sensitive adhesive, and an a…