Materials Literature
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The use of porous anodic alumina as a contact mask for ion-milling is demonstrated here to produce highly regular periodic arrays of nano-holes or bosses in an aluminum surface. The interaction of the molten aluminum with the alumina can be either wetting or non-wetting, according to the temperature of the melt, resul…
The tensile strength of ferritic-martensitic HCr-0.5Mo-2W, Nb, V stainless steel (PNC-FMS), which had been developed for core component applications in LMFBR by Japan Nuclear Cycle Development Institute, was evaluated for the effects of thermal aging, sodium exposure, and neutron irradiation. The tensile strength of t…
A detailed examination of a magnesium alloy, AZ91D, in as cast condition was carried out by using electron microscopy techniques. Particles of Al17Mg12, known as β and Al8Mn5 precipitates have been identified by electron diffraction. It was found that Al8Mn5 particles adopted coarse angular shapes, while β phase exist…
Emeraldine base has been doped with the sulfonated calixarene host species, calix[4]- p -tetrasulfonic and calix[6]- p -hexasulfonic acid in water or DMSO solvents, yielding novel colloidal conducting emeraldine salts PAn.calix[4]SO 3 H and PAn.calix[6]SO 3 H. The colloidal polyaniline products were characterized by U…
Copper tubing used in potable water plumbing systems occasionally experiences reactions that lead to the release of copper corrosion by-products into the water. The main factor controlling microbiologically influenced corrosion (MIC) of copper has been identified as a decrease in pH, which in conjunction with the inco…
By means of differential scanning calorimetry, the influences of AClyn® on the crystallization of poly(ethylene terephthalate) (PET) were investigated and compared with Surlyn®. AClyn initiates heterogeneous nucleation and substantially increases the crystallization rate of PET while Surlyn dissolves in molten PET and…
A phenomenological continuum model for computational use has been developed to describe large amplitude transient wave propagation in heterogeneous multi-component materials. A key feature of the model is a physics-based treatment of the continuum response of microstructural components with markedly dissimilar elastic…
An ab initio method is described for solving protein structures for which atomic resolution (better than 1.2 A) data are available. The problem is divided into two stages. Firstly, a substructure composed of a small percentage ( approximately 5%) of the scattering matter of the unit cell is positioned. This is used to…
Ein bevorzugtes Wachstum entlang der 〈110〉-Achsen findet bei der Herstellung von Pt-Nanodrähten durch Reduktion von [Pt(NH3)4]+ in den Mesoporen des Molekularsiebs MCM-41 statt. Die Nanodrähte haben einen einheitlichen Durchmesser von 3.0 nm bei Längen zwischen einigen zehn und einigen hundert Nanometern. Sie bestehen…
The attachment of peptides to the surface of spherical dendrimers via graft polymerization is described here (see Figure). It is shown that the resulting peptide dendrimers display greatly enhanced helicity compared to non-dendrimer-based analogues. This effect is attributed to aggregation of peptide segments on the d…
In water-based lyotropic liquid crystals (LCs), e.g., aqueous suspensions of V2O5, the electrooptical effects typical of thermotropic mesophases are difficult to observe, owing to the large conductivity and electrochemical reactions of the suspensions. Overcoming these difficulties, the authors demonstrate that V2O5 a…
Semi-flexible copolyimides with various alkyl chain lengths (BTDA-ODA/CnMPD PIs) were newly synthesized in N-methyl-2-pyrrolidone from benzophenonetetracarboxylic dianhydride, 4,4′-oxydiphenylene diamine, and 3,5-diaminobenzoyl n-alkanoates. The films were rubbed with varying rubbing densities, and on the rubbed surfa…
Atomistic simulation techniques are used to investigate the effect of proton-containing defects on the structure and stabilities of a range of grain boundaries of forsterite. We study two series of stepped {010} tilt boundaries that are at 90° to each other: one with the {100} plane as step wall and the other with the…
A new method for drilling holes in engineering ceramics by using a rotary ultrasonic tool has been developed. In this method, a drilling tool impregnated with abrasive particles is simultaneously rotated and vibrated. The mechanism of ultrasonic drilling is analysed using the concept of fracture mechanics and a new th…
Abstract Akzo Nobel Chemicals has recently introduced on the market an aromatic oligomeric phosphate (BDP) based on Bisphenol A. This product shows higher thermal and hydrolytic stability than other aryl phosphates. It provides similar or better fire retardant performance than an oligomeric phosphate (RDP) based on re…
We describe improvements to a previously reported hyper-Rayleigh scattering technique [J. Opt. Soc. Am. B15, 289 (1998) ], for measuring all rotational invariants of the first hyperpolarizability tensor. The full hyper-Rayleigh scattering tensor is expressed in terms of its rotationally invariant components leading to…
The ${\mathrm{La}}_{2\ensuremath{-}2x}{\mathrm{Ca}}_{1+2x}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ $(0.6<~x<~1.0)$ series has been successfully synthesized using a citrate gel technique in order to study their structure and properties as a function of x in the ${\mathrm{Mn}}^{4+}$-rich region of the phase diagram. Rie…
An approach for scaling the ac conductivity in ion-conducting glasses was recently demonstrated. Here we demonstrate that this proposed scaling can be applied to the corresponding ac permittivity and thus leads to a complete description of the scaling of both the real and imaginary components of the dielectric respons…
Porous silicon thin films created under laser illumination in fluoride solutions without biasing have been studied by a variety of techniques to investigate the film structure and photoluminescence (PL). The use of ultrathin silicon wafers allows us to perform plan view transmission electron microscopy studies without…
A relation between B -site transition metal and ferroelectricity is investigated in A B O 3 perovskite-type oxides. We focus on intensity of the covalent bonds between the B-site atom and the oxygen octahedron and evaluate Harrison's covalency parameter α. The density functional theory within the local density approxi…