Materials Literature
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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…
The equation of state and the mechanical response (dynamic tensile strength and dynamic shear strength) of the shape memory alloy NiTi have been investigated using plate impact. The Hugoniot has been extended with additional data and a nonlinear behavior of the Hugoniot (shock velocity-particle velocity) has been note…
General concepts concerning the formation, structure, and some properties of nanosized structural elements in polymers and polymeric materials are summarized from the standpoint of feasibility of formation of nanoparticles and nanoreactors in such systems and practical use of advantages offered by these structures. Th…
Stability and atomic geometry of mono-, di-, and trivacancies in graphene sheets are studied by using first-principles calculations. We find that the atomic relaxation substantially contributes to the stability of the vacancies. The monovacancy is found to have a nonplanar structure, i.e., its symmetry is C 1 h , whil…
The azobenzene-containing polyanion PAC-azoBNS was alternately assembled with the polycation diazoresin (DAR) to construct photo-cross-linkable multilayer films of PAC-azoBNS/DAR that contain photolabile groups of azobenzene. Upon mild UV irradiation, the interaction between PAC-azoBNS/DAR multilayers was converted fr…