Materials Literature
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The microscopic structure of muka (fiber aggregate extracted from harakeke) (observed using light microscopy and scanning electron microscopy) from six selected cultivars of harakeke varied, and this may explain the differences perceived by weavers, and that different end uses are preferred for various cultivars. The…
L'oftedalite, de composition ideale (Sc,Ca,Mn 2+ ) 2 K (Be,Al) 3 Si 12 O 30 , est une nouvelle espece minerale provenant de la pegmatite granitique de Heftetjern, au nord-ouest de la paroisse de Tordal, dans le sud de la Norvege. Elle se presente en cristaux prismatiques trappus atteignant un diametre de 100 μm, en as…
Modern high speed and power machinery components like gears, bearings, pumps, hydraulics and motors normally suffer from wear phenomena during operation. The study of wear debris can help estimate the condition of the surface of a component, so its basic features may be used to diagnose component health prior to failu…
Abstract In this article, we show how the mathematical concept of a deformed model set can be used to gain insight into the diffraction pattern of quasicrystalline structures. We explain what a deformed model set is, what its characteristic features are and how it relates to certain disorder phenomena in solids. We th…
A spectrophotometric study of 1:1 donor–acceptor complex, cobalt (III) acetylacetonate (donor) and iodine (σ-acceptor) has been preformed. The equilibrium constants, (K) and the absorpitivity (ε) for the formation of the iodine complex have been calculated. The predicted structure of the solid triiodide charge-transfe…
This paper aims to find a field description of local conservation laws at nano/ micro scales. Atomistic definitions and field representations of fundamental physical quantities are presented. By decomposing atomic deformation into homogeneous lattice deformation and inhomogeneous relative atomic deformation, and also…
A model ceramic foam was produced by expanding the sintered dense shell of refractory 3 mol% yttria‐stabilized zirconia, utilizing its superplastic deformation. The conventional production of porous ceramics by the sintering of a foamed precursor results in either insufficient sintering if porosity is to be maintained…
Stornesite-(Y), end-member formula Y⃞ 2 Na 6 (Ca 5 Na 3 )Mg 43 (PO 4 ) 36 , is a new Y-dominant analog of the meteoritic mineral chladniite. A representative electron microprobe analysis is SiO 2 = 0.02, P 2 O 5 = 48.11, SO 3 = 0.05, MgO = 23.16, MnO = 0.24, FeO = 15.55, Na2O = 5.04, CaO = 5.66, SrO = 0.02, Y 2 O 3 =…
Novel porphyrin derivatives with twelve flexible alkyl chains, namely meso‐tetra[4‐(3,4,5‐n‐trialkoxybenzoylamino)phenyl]porphyrins (1a, n = 12; 1b, n = 16) and the zinc complex (2a) were synthesized. The mesomorphic properties were investigated by DSC, WAXD and polarizing optical microscopy; the results showed that 1…
New lysine-based dendrimers which upon reaction with a poly(ethylene glycol) di-activated ester afford a soft flexible hydrogel that can be used to seal a wound in the sclerotomy. These wounds are made during the common ophthalmic procedure of a vitrectomy. The rheological and swelling properties of the hydrogel can b…
Nickel (Ni) performs its biological or toxic functions in nickel-protein coordination form. Novel Ni-binding peptides were isolated from a random dodecapeptide library displayed on the flagella of Escherichia coli against immobilized ions. On the basis of isolated sequences rich in histidine residues, two secondary li…
In this study we report the preparation, physical characterization and electrochemistry of peripherally functionalized substituted ionophore double-decker lanthanide phthalocyanines, lanthanide bis-[(4,4″,4″,4‴)-tetrakis-(6-hydroxyhexylthio)phthalocyaninates], { M [ Pc ( S - C 6 H 13 OH ) 4 ] 2 } ( M = Pr III , Yb III…
We report the results of optical transmission, photoluminescence (PL), and radio-luminescence measurements on x ray, γ ray, and UV irradiated RbCdF3:Mn2+ single crystals with different Mn2+ concentrations. There is a radiation-induced increase in the optical absorption and PL intensity that correlates with the Mn2+ co…
Abstract The strong adsorption to kaolinite of four polyaromatic, cationic dyes (9-aminoacridine, 3,6-diaminoacridine, azure A and safranin O), which adsorb much less to alumina or silica, was investigated by means of acid-base titrations, measurements of adsorption at varying pH and dye concentration, and by ATR-FTIR…
Porous chitosan microspheres with diameters ranging from 180 μm to 280 μm were successfully prepared, using an anti-phase suspension method combined with temperature controlled freeze-extraction. The mean pore diameter could be regulated from 5 μm to 60 μm by varying the freezing temperature through the cooling rate.…
A new approach to artificial muscle actuator design is presented, and is implemented using shape memory alloys (SMA). An array of SMA actuators is segmented into many independently controlled, spatially discrete volumes, each contributing a small displacement to create a large motion. The segmented cellular architectu…
Light-induced structural changes in single crystals belonging to the β-As 4 S 4 -As 8 S 9 series and in a crystal of synthetic β-As 4 S 3 were monitored step by step by determining the unit-cell dimensions. A marked increase of unit-cell volume as a function of exposure time was observed for all the crystals belonging…
We have examined the device characteristics of solution-processed single-walled carbon nanotube (SWNT) transistors. By using an electrical breakdown, SWNT-field-effect transistors (FETs) exhibited an on/off ratio ( I on / I off ) of 10 4 and a field-effect mobility of 3.6 cm 2 V -1 s -1 in air, which are comparable to…
The reaction mechanism for hydroxylation of benzene by N(2)O has been studied on chemically modified ZSM-5 catalysts. A maximum in catalytic activity and selectivity was reached for steamed samples under mild conditions (about 30% conversion with 94% selectivity). Chemical modifications, through ion exchange (H(+) ver…
This work investigates the effect of polymer molecular weight (M(W)) on the surface morphology of poly(methyl methacrylate) (PMMA) and polystyrene (PS) films doped with iodonaphthalene (NapI) and iodophenanthrene (PhenI) following irradiation in air at 248 nm. In agreement with previous studies, irradiation of PMMA at…