Materials Literature
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The phase diagram of star polymer solutions in a good solvent is obtained over a wide range of densities and arm numbers by Monte Carlo simulations. The effective interaction between the stars is modeled by an ultrasoft pair potential which is logarithmic in the core-core distance. Among the stable phases are a fluid…
The wide variation in reported cupric hydroxide solubility constants is attributed to the age of the solid, kinetic limitations in approaching equilibrium, and transient formation of basic copper nitrate solids. In situations similar to those where cupric hydroxide solubility constants were determined via precipitatio…
The electro-optical response of colloidal dispersions of rod-shaped gold particles is studied for various aspect ratios (2.6 < L/d < 49; d = 15 nm) by monitoring the absorbance spectra in the visible wavelength regime. The absorbance spectra strongly depend on the degree of orientational order of the rods and the dire…
A microscopic picture of the ``preparation'' of a crystal to the transition to liquid state at the approach to melting temperature is proposed. Basing on simple crystallogeometric considerations and the analysis of the computational results for corresponding anharmonic characteristics an evaluation is given for the ma…
SCALPEL is a tue 4X reduction technology that capabilities on high resolution capabilities from electron beam exposure and high throughput capabilities from projection printing. Current mask blank fabrication for SCALPEL technology use widely available 100 mm, crystalline silicon wafers. The use of 100 mm crystalline…
Water-soluble a-PHB oligomers (from dimer to dodecamer) were synthesized by anionic oligomerization of ( R,S )-β-butyrolactone and characterized by electrospray ionization tandem mass spectrometry (ESI-MS n ). The oligomers were analogous to the degradation products remaining after enzymatic hydrolysis of synthetic hi…
The local Ni II and Mn II magnetization was measured in the two paramagnetic high-spin molecules [Cr{(CN)Ni(tetren)} 6 ](ClO 4 ) 9 (intramolecular ferromagnetic coupling) and [Cr{(CN)Mn(TrispicMeen)} 6 ](ClO 4 ) 9 ·3THF (intramolecular antiferromagnetic coupling) by X-ray magnetic circular dichroism (XMCD). The absorp…
We show that the Adam and Gibbs model of relaxation of liquid and polymeric glass-formers based on the configurational entropy, S c, cannot account for several important experimental facts and phenomenology. These shortcomings include the decrease of the glass temperature when the glass-former is confined in nanometer…
Experiments on the diffusion-limited corrosion of porous copper clusters in thin gap cells containing cupric chloride are reported. By carefully comparing corrosion front velocities and concentration profiles obtained by phase-shift interferometry with theoretical predictions, it is demonstrated that this process is w…
We report here two different methods for preparing thiol-functional polymers. The first method consists of esterifying the hydroxyl-terminated polyesters with a thiol-protected mercaptoacetic acid. The Sangers reagent (2,4-dinitrofluorobenzene) was used to protect the mercaptoacetic acid and was removed with mercaptoe…
For the first time a selenium species has been successfully trapped in the voids of an electroneutral SiO 2 modification, namely, in the porosil decadodecasil 3R (DDR). Raman spectroscopy in combination with theoretical ab initio calculations at the SCF and MP2 levels of theory have been used to assign the observed sp…
This paper presents the first experimental results on Marangoni–Bénard instability in a symmetrical three-layer system. A pure thermocapillary phenomenon has been observed by performing the experiment in a microgravity environment where buoyancy forces can be neglected. This configuration enables the hydrodynamic stab…
Macromolecular Gd(III) complexes may find useful application as contrast agents for magnetic resonance angiography (MRA). Herein two novel systems are reported, namely Gd(DO3ASQ)3-lys16 and Gd(DO3ASQ)30-orn114. Their syntheses are based on the ability of the squaric acid moiety to act as a linker between the DO3A (1,4…
Isotactic poly(1-butene) (PB-1) films, consisting either of crystal form III (solution-grown crystal mat) or I‘ (melt-crystallized film under a high pressure), were drawn uniaxially by tensile draw and solid-state coextrusion in the range of room temperature to 80 °C, below their melting temperatures ( T m = 90−100 °C…
For the diagonalization of the Hamilton matrix in the Heisenberg model relevant dimensions are determined depending on the applicable symmetries. Results are presented, both, by general formulae in closed form and by the respective numbers for a variety of special systems. In the case of cyclic symmetry, diagonalizati…
By means of ab initio molecular dynamics and band structure calculations, as well as using calculated STM images, we have singled out one structural model for the (3x2) reconstruction of the Si-terminated (001) surface of cubic SiC, amongst several proposed in the literature. This is an alternate dimer-row model, with…
The influence of colloid diameter on the surface plasmon resonance (SPR) response of a colloidal Au modified Au film is described. Adsorption of 30−59 nm diameter colloidal Au on the surface of a 47 nm thick Au film results in dramatic, size-dependent shifts in plasmon angle, minimum reflectance, and curve breadth. Ea…
The diameters of primary mesopores in materials with well-defined cylindrical pores can be accurately determined by the 4 V / A method when the volume and surface area are determined by a standard adsorption method and 13.5 Å 2 is used as the molecular area of adsorbed nitrogen. A simple method for determining standar…
Copolymers of acrylic acid and styrene with styrene unit contents of 2.7, 5.7, and 9.5% were synthesized by free radical copolymerization. Poly(ethylenimine)s with benzylated unit contents of 2.4, 6.0, 10.6, and 16.7% were obtained by the reaction of poly(ethylenimine) with benzyl bromide. Polyelectrolyte complex caps…
Composites based on maleated polypropylene and methyl cellulosic fiber were prepared by extrusion followed by injection molding. The methyl cellulosic fiber was pretreated with tetrabutyl orthotitanate prior to compounding. The mechanical and thermal properties, as well as morphology of composites, were investigated b…