Materials Literature
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The crystalline structure of two sequential poly(ester amide)s derived from glycine, terephthalic acid, and 1,6-hexanediol or 1,12-dodecanediol has been investigated using X-ray and electron diffraction and real space electron microscopy. Crystal packing shows features of both polyamides and polyesters. The structures…
It has recently been found that alloying with copper improved the inherently poor grindability and wear resistance of titanium. This study characterized the corrosion behavior of cast Ti-6Al-4V alloyed with copper. Alloys (0.9 or 3.5 mass % Cu) were cast with the use of a magnesia-based investment in a centrifugal cas…
The solution form of IIA(Ntr) from Escherichia coli and its interaction with its partner protein, NPr, were characterized by nuclear magnetic resonance (NMR) spectroscopy. The diffusion coefficient of the protein (1.13 x 10(-6) cm/sec) falls between that of HPr (approximately 9 kDa) and the N-terminal domain of E. col…
No holes barred: Trimethylene-bridged 1 can be prepared from [{SiCH2(OEt)2}3]. Compound 1 can be directed to self-assemble by a tri-block copolymer template to form a periodic mesoporous organosilica with highly ordered and uniform-diameter mesopores in which practically all the building blocks remain intact within th…
In this study, we examined the luminescence response of Ti-doped Al2O3 crystals to high-energy vacuum ultraviolet (UV) excitation. In addition to the thoroughly studied emission band of Ti3+ in the near-infrared region and blue emission at 420nm, we detected a UV emission band at 290nm. The excitation spectra of all e…
We report on the magnetic and structural properties of Co-doped ZnO nanoparticles prepared by the vaporization-condensation method in a solar reactor. X-ray diffraction data and high-resolution electron microscopy (HREM) confirm the total absence of metallic Co clusters or any other phase different from würtzite-type…
Catalyst-free needle-like ZnO nanowires have been grown on Si(111) substrate at 430 °C via a simple solid–vapour process. The obtained nanowires are found to have a uniform size distribution with sharp tips. The lengths of the nanowires range from 2.8 to 3.2 µm with diameters of about 100 nm for the root and 30 nm for…
We report molecular simulation and experimental results for the freezing/melting behavior of Lennard-Jones fluids adsorbed in pores of cylindrical geometry, using simple models for multiwalled carbon nanotubes (MWNTs) of inner diameter 5nm. For cylindrical pores, our results for a D=9.7σff MWNT show no formation of re…
The motion of coupled oscillators based on multiwalled carbon nanotubes is studied using rigid-body dynamics simulations. The results show the existence of chaotic and regular behaviours for a given total energy, indicating the manifestation of chaos in nanoscaled mechanical systems based on carbon nanotube oscillator…
Gd(OH)3 nanorods have been prepared via hydrothermal growth, and their microstructures are characterized by x-ray diffraction, high-resolution transmission electron microscopy and electron energy loss spectroscopy. The diameters of the Gd(OH)3 nanorods are 15–20 nm and the lengths are 150–250 nm. The nanorods are sing…
We report on the observation of giant relief modulation in amorphous chalcogenide As2S3 glass under polarization modulated near band gap light illumination. We show that these periodic modulations are created as a result of the photoinduced mass transport despite the very low and uniform intensity light illumination.…
The 240–620nm diameter nanowires were freely suspended and thermopower measurements were carried out over the temperature range 4–300K and for stresses as high as 1GPa. The peaks of up to 80μV∕K that are observed around 40K are interpreted in terms of a model of diffusion thermopower under strong electron and hole-bou…
Sandwich maker: A new class of transition-metal sandwich complexes [(η6-B6X)2M] (X=C, N; M=Mn, Fe, Co, Ni) is predicted by density functional calculations. The results suggest that salts of transition-metal complexes containing carbon atoms in a planar hexacoordinate environment might be synthesized and characterized…
GaMnN dilute magnetic semiconductor samples, prepared by metalorganic chemical vapor deposition, are shown to exhibit ferromagnetism or even paramagnetism depending upon the type and concentration of extrinsic impurity present in the film. In addition, GaMnN deposited using growth parameters normally yielding a nonfer…
Around the glass transition temperature, relaxation dynamics in glass-forming materials follows a strong nonexponential behavior. It is widely accepted that an empirically based stretched exponential function, known as the Kohlrausch–Williams–Watts (KWW) function, ϕ(t)=e−(t∕τ)β, describes universally a broad variety o…
Tetrathiafulvalene (TTF) and its derivatives are exceptional building blocks in many areas of organic, supramolecular, and materials chemistry. Since the discovery ca. 30 years ago of the first “organic metal” tetrathiafulvalene-tetracyano-p-quinodimethane (TTF-TCNQ), a huge number of TTF derivatives have been synthet…
This review provides a brief survey of the computational methods which have been adopted to model fracture in materials, particularly polycrystalline metals and alloys, and considers in greater detail the use of geometrical modelling. The different modes of fracture, transgranular and intergranular brittle and ductile…
We report on a very simple, efficient, and economical synthetic technique that produces SiC of a high surface area, and under different conditions of a silicon carbide−carbon nanocomposite (SCCN) at a relatively low temperature. A high yield of pure products is obtained in a one-stage, single-precursor reaction, witho…
Tubular warning bells. Water-soluble, protein-functionalized, single-walled carbon nanotubes (immuno-SWNTs) have been prepared that can recognize and capture pathogenic E. coli cells selectively by antibody–antigen conjugation in a physiological environment, as shown in the scanning electron microscopy image.
The tri(alkoxy)siloxy complexes MO[OSi(O t Bu) 3 ] 4 ( 1, M = Mo and 2, M = W) were prepared from MOCl 4 and LiOSi(O t Bu) 3 . Similarly, reactions of MO 2 Cl 2 (DME) with LiOSi(O t Bu) 3 afforded the new siloxide complexes MO 2 [OSi(O t Bu) 3 ] 2 ( 3, M = Mo and 4, M = W), which are themally unstable at ambient tempe…