Materials Literature
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The HMQC-TOCSY 3D NMR technique has been used to study the DAB-16 [poly(propyleneimine)] dendrimer (the third generation) on a 750 MHz spectrometer. In the HMQC-TOCSY 3D NMR spectrum, it is possible to disperse 1 H signals based on the well-resolved 13 C chemical shifts and to obtain both one-bond 1 H− 13 C connectivi…
The aim of the present work was to evaluate the disinfectant capacity and the possible fields of application of a combined silver and hydrogen peroxide (HP) water disinfectant. The findings demonstrated the high bactericidal action of silver (on E. coli) and its relatively ineffective virucidal effect (on MS-2 phage).…
Reverse mode operation shutters have been achieved with polymer dispersed liquid crystals by means of polymerization-induced phase separation of nematic mixtures consisting of a low molecular mass liquid crystal and a liquid crystalline monomer. Fluid mixtures were homeotropically aligned by rough surfaces and transpa…
Recently developed dynamic step-scan FT-IR spectroscopy combined with software-based digital signal processing (DSP) was applied for infrared rheo-optical measurements of isotactic polypropylene and regenerated Bombyx mori silk fibroin film undergoing sinusoidal mechanical strain. Comparative measurements of dynamic i…
Green state joining of SiC was investigated using a paste consisting of polycarbosilane polymer and SiC powder. The joining process and densification were described. Initial experiments resulted in the formation of symmetrical black bands and cracks on both sides of the joint. However, with modifications in processing…
A versatile approach to a new family of radially layered copolymeric poly(amidoamine−organosilicon) (PAMAMOS) dendrimers containing hydrophilic polyamidoamine (PAMAM) interiors and hydrophobic organosilicon (OS) exteriors is described. The synthesis involves either Michael addition of organosilicon acrylates or methac…
In this paper the equivalent sources methods, written in terms both of the actual and of the external field, are used for the computation of the total force in two-dimensional axisymmetric problems. A Finite Element modeling of the magnetizing currents as field sources is presented in order to improve the formulations…
Vector hysteresis models are applied to an eddy-current analysis. The vector hysteresis models are composed by play hysterons and stop hysterons. The eddy-current analysis shows that both play and stop hysteron models can effectively describe isotropic vector hysteretic behavior. The stop hysteron model is more effici…
Solution-grown lamellar single crystals of bacterial poly[( R )-3-hydroxyvalerate] (P([ R ]-3HV)) have been prepared in a mixture of chloroform and methanol. P([ R ]-3HV) crystals were square-shaped and gave well-resolved electron diffraction diagrams from which the reciprocal lattice parameters a* = 1.052 nm -1, b* =…
The effects of xylenes/ethanol solvent mixtures on lanthanum‐modified lead zirconate titanate (PLZT) nonaqueous suspensions were investigated by measuring sediment height, viscosity, and adsorption of dispersant. Well‐dispersed colloidal suspensions were obtained in xylene‐rich solvents with a minimum amount of menhad…
The ageing of HDPE/cellulosic fiber composite exposed to drastic weather and the percentages of cellulosic fibers are responsible for some changes in the crystallinity of component matrix (HDPE). Two types of samples have been evaluated during different periods of time (up to 90 days). One in which cellulosic fibers h…
Micromechanical deformation mechanisms of two slightly branched polyethylenes have been studied by transmission electron microscopy and scanning force microscopy. Using an ethylene/hexene copolymer the transformation of the lamellar structure in the oriented structure inside a notch-tip craze and using a binary blend…
Though it is of great importance, the majority of predictive models tend not to incorporate water chemistry in their formulations. The ionic diffusion model which was developed for CaCO3, is based purely on crystallization, and is one of the few models that incorporates water chemistry. This model does not provide sat…
The local plane-interface approximation (LPIA) is a method for propagating electromagnetic fields through the inhomogeneous regions (e.g., elements) of an optical system. The LPIA is the superclass of all approximations that replace the usually curved optical interfaces with local tangential planes. Therefore the LPIA…
Dicalcium aluminate (Ca 2 Al 2 O 5 ) was prepared in a piston cylinder apparatus at 1250 °C and 2.5 GPa. The compound is orthorhombic with space group symmetry /2mb, a = 5.2281(1) Å, b = 14.4686(2) Å, c = 5.4004(1) Å (Z = 4, D calc = 3.481 g/cm3), and belongs to the brownmillerite structure family. Main building units…
In this paper, the calculation of the Cosserat constant l for a polycarbonate honeycomb is carried out experimentally. Circular-cell honeycomb plates were compressed under uniaxial loading for two different boundary value problems. The first configuration was a plate with a centrally located circular hole while the se…
Smectic mesophases in the calamitic liquid crystalline materials such as 2-phenylnaphthalene derivatives exhibit fast ambipolar carrier transport, whose mobility is up to 10−2 cm2/Vs. For these mesophases, we have investigated the effect of defects in the bulk and at the domain boundary on these carrier transport by m…
The crystallization of a new macromolecule is still very much a trial-and-error process. As is well known, it requires the search of a large parameter space of experimental settings to find the relatively few idiosyncratic conditions that lead to diffraction-quality crystals. Crystallographers have developed a variety…
Despite the recent progress in the synthesis of new germanates, no zinc germanate has been synthesized by using a molecular templating route. A unique type of zincogermanate framework has now been prepared by using ethylenediamine as the structure-directing agent. The three-dimensional framework can be simply describe…
The crystal structures of stuffed derivatives of quartz within the Li 1-x Al 1-x Si 1+x O 4 system have been refined by Rietveld analysis of powder synchrotron X-ray diffraction (XRD) data. Our results reveal an Al-Si order-disorder transition at x = ~0.3 and a β-α displacive transformation at x = ~0.65. Structural va…