Materials Literature
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A new approach for vectorial growth of single-wall carbon nanotube arrays is presented. The origin of growth is defined by patterning the catalyst nanoparticles, while the direction of growth is defined by a local electric field parallel to the substrate. Statistical analysis of the nanotube angular distribution indic…
Ceria is an important component in three-way catalysts for the treatment of automobile exhaust gases owing to its ability to store and release oxygen, a property known as the oxygen storage capacity. Much effort has been focused on increasing the OSC of ceria, and one avenue of exploration is the ability to fabricate…
In this report, exploitation of the unique properties of single-walled carbon nanotubes (SWNT) leads to the achievement of direct electron transfer with the redox active centres of adsorbed oxidoreductase enzymes. Flavin adenine dinucleotide (FAD), the redox active prosthetic group of flavoenzymes that catalyses impor…
An N-doped, p-type ZnO layer has been grown by molecular beam epitaxy on an Li-diffused, bulk, semi-insulating ZnO substrate. Hall-effect and conductivity measurements on the layer give: resistivity=4×101 Ω cm; hole mobility=2 cm2/V s; and hole concentration=9×1016 cm−3. Photoluminescence measurements in this N-doped…
Abstract Three structural phase transitions were observed for a new tetraethylammonium compound, [(C 2 H 5 ) 4 N] 2 SiF 6 , by means of differential scanning calorimetry. The internal vibrational modes of the [(C 2 H 5 ) 4 N] 2 SiF 6 compound were studied at ambient temperature and through the phase transitions with t…
Abstract Polyesters and poly(ester carbonates) were synthesized via ring‐opening polymerization with new tin(II) macroinitiator adducts containing oligomeric L ‐lactide (LLA), rac ‐lactide ( rac ‐LA), and ϵ‐caprolactone (CL). The novel initiating species were synthesized by the reaction of LLA, rac ‐LA, or CL with Sn(…
Abstract Surface chemical patterns of plasma‐polymerized hexane were produced using a simple masking technique. The rate of proliferation of Chinese hamster ovary (CHO) cells on the treated surfaces compared with untreated tissue culture polystyrene (TCPS) were found to correlate strongly with surface oxygen concentra…
Five kinds of (1:1), (1:3), and (2:1) salts of 3-[4-(diethylmethylammonio)phenyl]-1,5-diphenyl-6-oxoverdazyl radical cation [V](+) with M(dmit)(2) anions (M = Ni, Zn, Pd, and Pt, dmit = 1,3-dithiol-2-thione-4,5-dithiolate) ([V](+)[Ni(dmit)(2)](-) (1), [V](+)[Ni(dmit)(2)](3)(-) (2), [V](+)(2)[Zn(dmit)(2)](2-) (3), [V](…
Abstract Raman spectra of terephthalidine‐bis‐heptylaniline (TB7A) were recorded in the region 1125–1225 cm −1 from room temperature to 10 K at 18 different temperatures. The splitting of the ∼1165 cm −1 band, and the variation of the ratio of integrated intensities of the original band at ∼1165 cm −1 to the new compo…
Abstract A new positive working photosensitive poly(benzoxazole) (PBO) precursor based on poly( o ‐hydroxyazomethine) ( 3 ) and 1‐{1,1‐bis[4‐(2‐diazo‐1‐(2 H )naphthalenone‐5‐sulfonyloxy)phenyl]ethyl}‐4‐{1‐[4‐(2‐diazo‐1(2 H )naphthalenone‐5‐sulfonyloxy)phenyl]methylethyl}benzene (S‐DNQ) as a photosensitive compound was…
The Flory−Huggins interaction parameter, χ, of an off-critical poly(methylbutylene)/poly(ethylbutylene) blend was measured over a wide temperature ( T ) and pressure ( P ) range by comparing small-angle neutron scattering (SANS) profiles from single-phase systems with predictions based on the random phase approximatio…
The X-ray structural determinations of a series of asymmetric mixed-valence biferrocenium cations have been determined. The observations of the structural characteristics of the series of mixed-valence biferrocenium cations are also consistent with our Mössbauer studies. The features in the Mössbauer spectra of the as…
Mesoporous silicate−surfactant composites were prepared via washing of as-synthesized silicate−surfactant−expander materials in appropriate solvents. The expander can be generated in situ from the surfactant decomposition under high-temperature conditions, or supplied externally at the stage of the synthesis or postsy…
Abstract The increase in the interfacial fracture energy ( G c ) with increasing interfacial width ( a i ) goes through a transition at a critical value of a i that is unique to each polymer–polymer system. This transition point does not scale with the bulk entanglement spacing ( d t ) for different systems, implying…
We have designed a two-step procedure to coat silica particles with fluorescent 2,7-diazapyrenium dications. The electron-deficient character of the dications encourages the association of dopamine at the particle/water interface. The supramolecular event produces a significant decrease in the fluorescence intensity.…
Crystals of diiodo[phthalocyaninato(1-)] chromate(III) diiodine, CrPcI(2).I(2), were grown directly in the reaction of chromium powder with 1,2-dicyanobenzene under a stream of iodine at about 250 degrees C. The CrPcI(2).I(2) complex crystallizes in the centrosymmetric space group of the triclinic system with one mole…
Ab initio electronic structure calculations employing the fixed-spin moment procedure and the generalized gradient correction are used to explore the mechanical stability of $\ensuremath{\alpha}$-iron and related magnetic materials, including body-centered-cubic cobalt and ziconium. The mechanical stability is found t…
The stability under pressure and magnetic field of the different magnetic phases of ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}{\mathrm{MnO}}_{3}$ perovskite has been studied. This is accomplished by monitoring the pressure-induced shift in temperature of the two peaks that appear in the real part of the ac susceptibility…
The temperature dependence of the hysteresis loops and susceptibility for the melt-spun ribbon and bulk ${\mathrm{Nd}}_{60}{\mathrm{Fe}}_{30}{\mathrm{Al}}_{10}$ and ${\mathrm{Nd}}_{60}{\mathrm{Fe}}_{20}{\mathrm{Co}}_{10}{\mathrm{Al}}_{10}$ alloys were studied. The investigations were performed on as-cast and annealed…
Interaction of the achiral syn (face-to-face) conformer of the ethane-bridged bis(zinc octaethylporphyrin) with the enantiopure 1,2-diaminocyclohexane results in the exclusive formation of a supramolecular chiral tweezer. This 1:1 host-guest complex exhibits remarkable stability in both solution (even upon photoexcita…