Materials Literature
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A scanning vibrating electrode technique (SVET) was applied to make in-situ observations of stress corrosion cracking (SCC) in type 304 steel single crystals exposed to a 2.5 kmol m−3 H2SO4+0.4 kmol m−3 NaCl solution at room temperature. The three-dimensional (3-D) plots of corrosion current density during SCC can be…
The binding of rhBMP-2 to its receptors, the signal transduction cascade and the final responses of bone cells, osteoprogenitor cells and derived cell lines is of high fundamental and clinical interest. In this report concentration-response curves of the osteoblast cell line MC3T3-E1 under influence of rhBMP-2 was inv…
Se estudió la dinámica anual de las poblaciones de dos especies de anfípodos en un microambiente de agua dulce del arroyo Las Flores, afluente del río Luján. Hyalella (Mesohyallela) curvispina es un anfípodo herbívoro que se alimenta principalmente de las algas del fitobentos; Hyalella (Mesohyalella) sp. utiliza como…
Abstract Nanocomposites based on biodegradable poly(e-caprolactone) (PCL) and layered silicates (montmorillonite) modified by various alkylammonium cations were prepared by melt intercalation. Depending on whether the ammonium cations contain non-functional alkyl chains or chains terminated by carboxylic acid or hydro…
In our experiments, we investigate in situ three-dimensional crystals during free growth into pure undercooled liquid xenon. The undercooling Δ T is in the range of 80mK ⩽ ΔT ⩽ 168mK. We initiated morphological transitions of the growing crystal from dendrite to seaweed by a cooling step. The fact that such a transiti…
To develop the new-type poly(L-lactide)-based biomedical material having a wettable surface, the synthesis of poly(L-lactide) with one terminal D-glucose residue was investigated. After the hydroxyl group at 1-C of α-tetrabenzyl glucose, α-Glc(Bzl)4, was converted to the corresponding potassium alkoxide by using potas…
We have performed a series of electron irradiation experiments with 300 keV electrons on thin (Mg1.8Fe0.2SiO4) olivine samples in situ in a transmission electron microscope. The irradiation-induced modifications occur in two distinct stages: firstly, stage 1 is the breakdown of olivine into small MgO crystallites and…
Atomic environments in binary lead silicate and ternary alkali lead silicate glasses
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…