Materials Literature
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A bismethacrylatesilane monomer (BMS) was prepared via selective Michael addition of aminopropyltrimethoxysilane (APTMS) to the acrylate groups of 2-methacryloyloxyethyl acrylate (ethyleneglycol acrylatemethacrylate, EGAMA). Sol–gel condensation of BMS in triethyleneglycoldimethacrylate (TGDMA) afforded in situ stable…
Although the macroscopic, bulk behavior of liquids wetting (or dewetting) can be adequately explained by viscous flow, the intricate details near the solid/liquid/fluid triple line (TL) are still not totally appreciated.These two aspects correspond to the bases of the hydrodynamic approach and of the molecular kinetic…
Using a previously developed simulation model we study the changes in morphology of two-dimensional chain crystals caused by annealing. A series of various intermediate crystalline states with different stability exhibiting a non-monotonous evolution of the internal energy and the degree of local order was found. This…
Abstract Two new linear tri‐nickel(II) complexes with an infinite polymeric chain, [Ni 3 (μ 3 ‐dpa) 4 (C 4 O 4 Me)](BF 4 ) 1 and [Ni 3 (μ 3 ‐dpa) 4 (N 3 )](PF 6 ) 2 , [dpa − = di(α‐pyridyl)amido anion], have been synthesized and their structures were determined by X‐ray diffraction. Compound 1 crystallizes in the mono…
Short-chain alcohol dehydrogenases (SCAD) constitute a large and diverse family of ancient origin. Several of its members play an important role in human physiology and disease, especially in the metabolism of steroid substrates (e.g., prostaglandins, estrogens, androgens, and corticosteroids). Their involvement in co…
Oxygen 18 O tracer diffusion in Czochralski‐grown mullite single crystals is investigated along [010] and [001]. Oxygen diffusion coefficients range between ∼5 × 10 −20 m 2 /s (1250°C) and ∼9 × 10 −18 m 2 /s (1525°C). The data does not show any significant anisotropy. The values of the activation enthalpy (4.5 eV) and…
Macroscopically polar crystals of an organic zeolite, tris(o-phenylenedioxy)cyclotriphosphazene, are obtained by partial guest exchange of included THF molecules with nonlinear optical molecules, which enter the channels via a mechanism of surface recognition (4-amino-4′-nitrobiphenyl partially (left) and fully (right…
The photostability of various electro-optic active guest–host polymers, doped with chromophores that possess very efficient cyano-containing acceptors and dialkyamino- or diarylamino-benzenes, and also their extended thiophene analogs as bridging structures, has been investigated over a broad wavelength range in the n…
This contribution presents 4 × 4 matrices for generalized ellipsometry analysis of dielectric helical thin films within the algebraic framework for arbitrary anisotropic layered samples. Liquid crystal and solid-state material optical properties are used to demonstrate dielectric helical thin film examples, at visible…
In st i tute of P h ysi cs, Po li sh Academ y of Sciences al . Lo tni k w 32/ 46, 02-668 Warszawa , Po l and ( Recei ved December 18, 2001
Relaxation dynamics of low molecular glass-forming liquid triphenylomethane triglycidyl ether was studied under isothermal and isobaric conditions using dielectric spectroscopy. In addition we also carried out pressure-volume-temperature, PVT, measurements. The data enable us to examine the relaxation rate as function…
Erosion phenomenon of polyimide film under the hyperthermal atomic oxygen beam exposure, which is a simulated low Earth orbit space environment, has been investigated. The polyimide film was spin-coated on a sensor crystal of a quartz crystal microbalance, and the mass of the film was measured under the atomic oxygen…
Cermets composed of nickel metal and Y2O3-ZrO2-TiO2 ternary ceramics were investigated by X-ray diffraction, dilatometry, electrical and microstructural measurements and are regarded as improved anode materials with respect to long-term stability. With increasing titania content it was possible to minimise the electri…
The amorphous phase of hydrogenated carbon nitride, a -CN x :H (0 ≦ x ≦1), films may have clusters consisting of a mixture of sp 2 - and sp 3 -hybridized materials with cluster sizes of 0.2–2 nm. The hydrogen termination limits the size of the carbon and carbon nitride clusters. It also influences the mechanical prope…
Aromatic copolyimides were prepared using 2,3,3′,4′-biphenyltetracarboxylic dianhydride (asymmetric BPDA or a-BPDA) and several aromatic diamines with flexible ether linkages to obtain melt-processable polyimides (PIs) with balanced properties, i.e. high T g , high thermo-oxidative stability, low melt viscosity, and s…
The influence of impurities on the crystallization kinetics of NaCl was investigated in a fluidized bed crystallizer. The growth and dissolution rates were related to the supersaturation and impurity concentrations. The effect of different impurities on the growth rate of NaCl crystals can be divided into thermodynami…
Abstract A synthetic octahedral-site-vacancy-free annite sample and its progressive oxidation, induced by heating in air, were studied by powder X-ray diffraction (pXRD), Mössbauer spectroscopy, nuclear reaction analysis (NRA), Raman spectroscopy, X-ray fluorescence (XRF) spectroscopy, gas chromatography (GC), thermog…
The successful use of dipyrromethanecarbinols in rational routes to porphyrinic macrocycles requires catalysis conditions that enable irreversible condensation, thereby avoiding substituent scrambling and formation of undesired porphyrin products. Previously, successful conditions of trifluoroacetic acid (TFA) (30 mM)…
A model for the population dynamics of Er3+ in tellurite glasses with high erbium concentrations is proposed. Luminescence decay curves from transitions of 4I13/2→4I15/2 and 4S3/2→4I15/2 were measured experimentally. Upconversion coefficients were obtained by numerically solving the rate equations of the model to fit…
Monazite was continuously coated onto Nextel 720 fibers, using an aqueous precursor and in‐line heat treatment at 900°–1300°C. Some experiments were repeated with alumina‐doped precursors. Coated fibers were heat‐treated for 100 h at 1200°C. Coatings were characterized by optical microscopy, scanning electron microsco…