Materials Literature
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A technique for calibrating the charge quantity using the pulsed electroacoustic (PEA) method is described in this paper. The space charge calibration technique is shown to depend on the electric and acoustic properties of the samples when the standard signal for calibration is obtained from the sample itself. Moreove…
The controlled calcination of the chromium containing polyhedral oligosilsesquioxane (c-C5H9)7Si7O9- (OSiMe3)O2CrO2, 3b, monitored by MS analysis of the evolved gases and thermogravimetry measurements, led to the formation of a microporous Cr–Si–O amorphous mixed oxide containing 10.2 wt.% of chromium. The textural pr…
This paper summarizes our research effort in developing polyimides functionalized with nonlinear optical chromophores for applications in second order nonlinear optical devices. In the past several years, we have developed several general synthetic approaches to these materials. Detailed physical characterization indi…
N-Alkyl-p-nitroanilines from the propyl to the octyl derivative are synthesised and characterised. Powder SHG studies show that the butyl derivative alone is active, in agreement with earlier observations. Crystal structures of the propyl, butyl and pentyl derivatives are determined; the propyl and pentyl derivatives…
Interfacial properties of bulk polymer samples have been characterized by direct measurements of long-range and adhesion forces using a non-interferometric bimorph surface forces apparatus. For this purpose, we developed a method where bulk polystyrene was melted and formed into drop-shaped surfaces with a cylindrical…
First-principles calculations of the second-order optical susceptibility are successfully performed for practical borate crystals, namely, ${\mathrm{LiB}}_{3}{\mathrm{O}}_{5},$ ${\mathrm{CsB}}_{3}{\mathrm{O}}_{5}$ (CBO), and ${\mathrm{BaB}}_{2}{\mathrm{O}}_{4},$ using the linearized augmented plane-wave band method. S…
CMR manganites were studied by x-ray absorption spectroscopy at the O K-edge above and below the transition temperature . In compounds which keep the insulating behaviour in the whole temperature range, the prepeak at the O K-edge remains unique upon cooling even in the case of the presence of a paramagnetic-ferromagn…
Mitsunobu coupling of a free base porphyrin tetraacid with four equivalents of a monohydroxy metalloporphyrin dimer leads to a highly non-polar dendritic nine-porphyrin array that is readily separated from more polar products resulting from incomplete coupling; photophysical measurements reveal an energy transfer proc…
Three different supramolecular architectures corresponding to [M([9]aneN 3 ) 2 ](TCNQ) 2 , (M=Ni II 1 or Cu II 2, [9]aneN 3 =1,4,7-triazacyclononane, TCNQ=7,7,8,8-tetracyanoquinodimethane), [Cu([9]aneN 3 ) 2 ](TCNQ) 3 3 and [Cu([9]aneN 3 ) 2 ](TCNQF 4 ) 2 , 4 (TCNQF 4 =2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimet…
In this dissertation, we propose a model and formulate a control methodology for a thin magnetostrictive rod actuator. The goal is to obtain a bulk, low dimensional model that can be used for real-time control purposes. Previous and concurrent research in the modeling of magnetostrictive actuators and the related area…
The tetragonal-to-monoclinic phase transformation of Y2O3-doped tetragonal ZrO2 polycrystals (Y-TZP) was investigated by annealing at 140°C in hot water. Sintered bodies of Y-TZP were prepared by sintering at temperatures ranging between 1300 and 1500°C, using a 3mol% Y-TZP fine powder, synthesized by means of the hyd…
We have developed special specimen holders for double-sided low angle ion beam thinning and have systematically studied possible improvements of the resulting TEM specimens with respect to surface roughness, radiation-induced damage and contamination. The specimen holders are entirely made from graphite and were built…
We present an approach to fabricate very large, soluble, self-contained metallosupramolecular entities employing a template-directed strategy based on charged nanoparticles: consecutive deposition of negatively charged macromolecules and positively charged metallosupramolecular coordination polyelectrolytes is exploit…
Thin films of PbS were chemically deposited on a range of surfaces comprising self-assembled monolayers (SAMs) on Au and on the gold substrate itself. The influence of the monolayer terminal group on crystal growth was investigated, and a range of contrasting functionalities were employed: COOH, OH, NH 2 , SO 3 H and…
The transport of model proteins, ranging from 12,300 to 150,000 Da, across tight rat alveolar epithelial cell monolayers (> 2000omegacm2) grown on polycarbonate filters, was studied. Model proteins were 14C-cytochrome c, 14C-ovalbumin, granulocyte-colony stimulating factor (G-CSF), 14C-bovine serum albumin (BSA), 125I…
A one-dimensional copper(II) complex with pyridine-2-sulfonate donors, [{Cu(3-mpSO3)2}n] (3-mpSO3 = 3-methylpyridine-2-sulfonate), is formed via the air oxidation of 3-mpds (2,2′-bis(3-methylpyridyl)disulfide) in the presence of CuBr2, and a mononuclear zinc complex, [Zn(3-mpSO3)2(H2O)2], which has two-dimensional H-b…
It has been demonstrated that the electrical conductivity of a composite film consisting of heat‐treated poly(anthranilic acid) (PANA) and poly(vinyl alcohol) is linearly related to the concentration. Heat‐treatment of PANA at elevated temperature led to the elimination of carboxyl groups, and to the formation of base…
This is the second paper of a two-part series dealing with the establishment of mathematical models for two types of 3D woven-fabric structures, i.e. backed cloths and multi-layer fabrics. Part I of this series dealt with the mathematical models for backed cloths. In Part II, weaves for multi-layer fabrics are mathema…
When prepared by the sol-gel dip-coating technique, doped tin oxide films need several superimposed layers to reach the expected low sheet resistance. In this paper we show that successive depositions increase the uniformity and homogeneity of multi-layered sol-gel tin oxide films. The final thickness is always found…
In the development of a new generation of totally implantable artificial hearts and left ventricular assist devices (VADs) for long-term use, the selection of an acceptable material for the fabrication of the ventricles probably represents one of the greatest challenges. Segmented polyether urethanes used to be the ma…