Materials Literature
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QCM showed that SiO2/poly(diallyldimethylammonium chloride) (PDDA) film assembly could be achieved in 2 s for 45 nm silica nanoparticle monolayers and 20 s for PDDA monolayers, with film integrity demonstrated by SEM and spectroscopic ellipsometry.
By using a surfactant-based synthesis strategy, we have earlier demonstrated that the polymerization and growth of silicate micellar assemblies at the air–water interface, under quiescent and dilute acidic aqueous conditions, yields free-standing sub-micron thickness hexagonal mesoporous silica films in which the chan…
A B S T R ACT : Infrared (IR) spectra of well-ordered kaolinites generally show four OH-stretching frequencies, near 3697, 3670, 3652 and 3620 cm i. Raman spectra of the same kaolinites mostly show an additional band near 3686 cm -~, which, in the coarsely crystalline Keokuk kaolinite, largely replaces the 3695 cm -I…
The crystal structures of four different conformers of the sterically encumbered porphyrins ZnDPP, H 2 DPP, and NiDPP are reported (DPP = 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrin). In combination with two previously published structures of H 2 DPP and NiDPP, the crystallographic results illustrate the rema…
Abstract This study introduces the idea of the sharpness concept in relationship to the determination of scanning electron microscope (SEM) performance. Scanning electron microscopes are routinely used in many manufacturing environments. Fully automated or semiautomated SEMs as metrology instruments are used in semico…
New linear conjugated porphyrin polymers are synthesized by a palladium-catalyzed cross-coupling reaction of [5,15- bis(ethynyl)-10,20-bis(mesityl)porphyrin]zinc and diiodobenzene derivatives; enhanced solubility of the conjugated porphyrin polymers is achieved by attachment of long alkyl ether or dialkyl amide groups…
The so-called bias pretreatment allows the growth of heteroepitaxial diamond films by plasma chemical vapor deposition on silicon (100) surfaces. We present plan-view and cross-sectional transmission electron micrographs of the substrate surface at different phases of the bias pretreatment. These observations are augm…
The relationship between surface speciation and catalytic activity/selectivity during methanol oxidation on polycrystalline rhodium under ambient-pressure flow-reactor conditions was studied from 25 to 500 °C by means of surface-enhanced Raman spectroscopy (SERS) along with parallel mass spectrometric (MS) measurement…
We study the depletion interaction between spherical particles of radius R immersed in a dilute solution of rigid rods of length L. The computed interaction potential is, within numerical accuracy, exact for any value of L/R. In particular we find that for L ∼ R, the depth of the depletion well is smaller than the pre…
Abstract Meso-meso coupled diporphyrins were prepared from 5,10,15-trisubstituted zinc-porphyrins in high yields upon treatment with AgPF6 alone or with AgPF6 and I2.
Peptide-based polymers can be transformable hydrogels, elastomers, regular thermoplastics, or inverse thermoplastics, and can function as diverse molecular machines. When of the appropriate composition, these polymers exhibit hydrophobic folding and assembly transitions in the accessible aqueous range as the temperatu…
Lanthanum fluoride consistently shows two strong thermoluminescence glow peaks at low temperature in pure material near 90 and 128 K. A model is proposed in which these thermoluminescence peaks arise from the annealing of halogen defect sites, similar to the $H$ and ${V}_{k}$ centers of the alkali halides. Relaxation…
Six dinuclear cobalt(II) complexes of pyrazolate ligands with multidentate chelating side arms {3,5-(R2NCH2)2C3N2H2; R2N = [Me2N(CH2)3]2N (HL1) or (Et2NCH2CH2)2N (HL2)} have been prepared and characterised. The reaction of L1 and L2 with 2 equivalents of [Co(MeCN)6][BF4]2 and NaBPh4 proceeds via the isolable compounds…
Two rigid Tröger’s base dizinc(II) bis-porphyrin receptor molecules 1 and the first generation of dendrimer tetramine 4 form a 2:1 complex 5, a self-assembled spherical superstructure encapsulating the dendrimer.
The reaction sequences of B-site precursors and perovskite phase formation, crystallographic data, dielectric properties, and microstructures in the PFW-PFN system are reported. The formations of B-site precursors and perovskite phases were studied by X-ray diffraction. B-site precursors formed directly from the const…
Rapidly solidified ferromagnetic shape memory Fe-29.6 at% Pd alloy was fabricated to develop a new type of actuator material responded to magnetic field. The thin ribbon samples which were made by the originally designed electro magnetically controlled nozzleless melt-spinning method showed stronger crystal anisotropy…
Abstract With their unique chemical stability and high electron mobility, boron‐doped thin diamond films are likely to have favorable properties for a number of electrochemical applications. A review of the recent developments in this field is presented with critical evaluation of the experimental data. In particular,…
Synthesis of mesoporous zirconia has been performed by slowly hydrolyzing zirconium propoxide in the presence of anionic surfactants: dodecyl phosphate or sulfate (P12 and Sf12) and hexadecyl sulfonate (So16). t-Plot surface areas >400 m2 g–1 and diffraction lines corresponding to spacings near 45 Å were measured for…
We report the morphology and phase behaviors of binary blends of polystyrene- block -polyisoprene (SI) copolymers, which were studied by a small-angle X-ray scattering (SAXS) technique. The neat SI copolymers employed in this study have almost the same molecular weights but different volume fractions of polystyrene bl…
A mesoporous MCM-48 membrane with high thermal stability has been synthesized on a porous stainless steel support by hydrothermal treatment.