Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFree Structure Confinement of Diblock Copolymer MultilayersP. Mansky and T. P. RussellCite this: Macromolecules 1995, 28, 24, 8092–8095Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https://pubs.acs.org…
Abstract Microbial layers on interfaces, called “biofilms” are characterized by a polymeric, highly hydrated gel matrix of microbial origin in which the organisms are embedded and immobilized. Biofilms exhibit degradation behaviour different from that free cells and accumulate water, metabolites, and sorbe substances…
Electronic structure calculations have been employed to study the associative desorption of preadsorbed atomic oxygen from a calcium oxide (100) surface. Two reaction mechanisms were considered, corresponding to symmetric and asymmetric reaction paths. The energy barrier of the latter was found to be the lower of the…
Abstract. The ductility of ultra-high purity copper at elevated temperatures was investigated: purity 99.9999% (6N) and 99.999999 % (8N). Tensile tests were conducted at temperatures ranging from 293K to 1073K at strain rates of 4.2~10- ~ s-l in a high vacuum. The results are discussed in comparison with those for 99.…
An analysis of the dynamic behavior of polymeric liquid crystals is given in terms of a second-rank order parameter tensor describing the orientational state of the local microstructure. The continuum equations governing the dynamics of the material are analyzed under both steady-state and transient conditions for iso…
Polarization-selective gratings are designed by use of rigorous electromagnetic diffraction theory. The polarizing effects are attained by special surface-relief structures. We present a scheme for coding two different optical functions in one diffractive element. It is based on a combination of the scalar diffraction…
The α → γ phase transformation, which occurs during quenching and produces extremely fine α2-γ lamellae, is discussed in relation to the analysis of the α2-γ interface structure. In a high-resolution image obtained from the growth edge of a γ plate in the α2 matrix, steps that were always found to be (0002)α2 or (111)…
Abstract We have synthesized four new ferrocene monomers (three diols and one diester). The redox potential of these ferrocene derivatives varies between 0 mV and 230 mV due to different degrees of ring alkylation. Amorphous and liquid crystalline copolyesters were prepared with these monomers in the polymer main chai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of Exciton Sizes in Squaraine Monolayers by Intralayer Photoinduced Electron TransferKangning Liang, Kock-Yee Law, and David G. WhittenCite this: J. Phys. Chem. 1995, 99, 45, 16704–16708Publication Date (Print):November 1, 1995Publication History Published online1…
This work summarizes results of a simple procedure to incorporate dopants into the near surface region of single-crystal sapphire. We demonstrate the formation of iron-doped and chromium-doped sapphire thin films by solid-phase epitaxial growth. Amorphous alumina films of about 200–350 nm thickness were deposited onto…
Sorption of Pt, Pd, Ir and Au on polyaniline, synthesised by chemical oxidation of aniline in HC1, from HC1, LiC1 and H2SO4 solutions in the concentration range 0.1 to 10 mol dm-3 has been studied. The as-prepared polyaniline (acid-PANI) and the one treated with 1 mol dm-3 NH4OH (base-PANl) have been used. Analysis of…
Benzene derivatives give, in cyclohexane solution, a strongly emitting (Φ f up to 0.8) excited complex with dibenzoylmethanatoboron difluoride (DBMBF 2 ). The rate constant k ex for the complex formation varies between 3.5 × 10 9 and 2.6 × 10 10 M −1 s −1 depending on the benzene derivative, and the complex emission c…
It has been stated that multistep-lap (MSL) jointed cores show distinct improvements regarding power losses P in comparison to single-step-lap (SSL). On the other hand, model core experiments tend to yield contradictory results. In the paper, special emphasis was put on the underlying physical mechanisms, taking into…
A new description of concentration-dependent ion exchange is presented. A three-dimensional, quasi-chemical approximation is used to estimate the chemical potentials of the exchanging cations. The diffusion coefficient is then expressed as a function of the self-diffusion coefficients, excess interaction energy and ca…
This article investigates, by a novel spectral analysis technique, the possibility of applying conventional x-ray photoelectron spectroscopy to characterize the initial oxidation process. Quantitative analysis of submonolayer native oxides is made possible by spectral decomposition of Si 2p into Si4+, Six+, and Si0+ b…
ABSTRACT Renaturation of α1 chains from shark skin collagen (1) was measured by the increase in optical rotation and viscosity. The rotation change of the α1(1) chains became constant after 18 hr, while the viscosity increased further with time. Size exclusion chromatographic patterns of renaturation products of α1 (I…
Recently, Cherkaev, Lurie, and Milton (1992) established an invariance of stress field in planar linear anisotropic elasticity under a specific shift in bulk and shear moduli; this is now known as the CLM theorem. Motivated by the importance of micropolar models in mechanics of media with micropolar structures, Ostaja…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory and Simulation of Optical Banded Textures of Nematic Polymers during Shear FlowW. H. Han and A. D. ReyCite this: Macromolecules 1995, 28, 24, 8401–8405Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1…
The information available on ultrasound field distributions in cleaning baths is limited. Two techniques capable of providing this information have been investigated. The first employs a thermistor probe coated with ultrasound absorbing material and uses the rate of temperature rise when the ultrasound is switched on…
Proteins associated with poly-beta-hydroxybutyrate (PHB) granules were purified from four Acinetobacter strains isolated from modified activated sludge treatment plants. Four predominant proteins of 64 kDa, 41 kDa, 38 kDa and 13 kDa were identified. N-terminal amino acid sequencing of the 64-kDa and 13-kDa proteins fr…