Materials Literature
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Patterned magnetic recording media composed of the arrays of Co cylinders were fabricated using anodic porous alumina with single domain hole configuration. The ac electrodeposition of Co into the holes of the alumina matrix of 63 nm hole interval generated the arrays of Co cylinders with high aspect ratios. The struc…
Reactions of trimethylaluminum, triethylaluminum, and diethylaluminum chloride and ethylaluminum dichloride with silica gel have been studied experimentally by infrared spectroscopy and elemental analysis. The silica gel was subjected to different pretreatments to alter surface functionalities prior to reaction. In al…
Abstract Microwave irradiation technique was used for the chemical modification and grafting of protein fibrous materials, such as domestic silk (Bombyx mori), tussah silk (Antheraea pernyi), and wool fibres. Epoxide compounds Denacol EX810 and EX313 reacted effectively with the protein substrates. As alkali catalysts…
A viscous-type dynamic hysteresis model (DHM) that is compatible with any static hysteresis model is described. In contrast to existing dynamic models, the DHM is characterized by fixed desired properties over an infinite frequency range and provides the possibility of changing the shape of the steady-state hysteresis…
Experimental transformation of a rather pure natural calcite marble to aragonite marble did not proceed via the expected straightforward polymorphic replacement. Instead, the small amount of Mg in the starting material (0.36 wt %) was excluded from the growing aragonite and diffused preferentially into the remaining c…
The experimental research on galvanomagnetic phenomena in layered organic conductors at high magnetic fields is discussed in terms of the theoretical ideas about charge transfer phenomena in conductors with a metallic type of conductivity and a quasi-two-dimensional electron energy spectrum of arbitrary form. Attentio…
Two new nitrile-containing diamine monomers, 4-[bis(4-aminophenyl)amino]benzonitrile and 4-[4-(1-cyanopropoxy)phenyl]2,6-bis(4-aminophenyl)pyridine were synthesized. The diamine monomers were reacted with various tetracarboxylic dianhydrides, followed by cyclodehydration (imidization) without isolation to produce a se…
The measurement of lattice parameters using the Le Bail method was shown to be inappropriate for a complex, low symmetry, structure, even with high resolution synchrotron diffraction data. The method failed as a result of ambiguous indexing in the absence of constraints on diffraction intensities, that arise when a st…
Hydrolytic decomposition of waste poly(ethylene terephthalate) (PET) is studied in the presence of an aqueous potassium hydroxide solution. A modified shrinking core model with a depleting product layer of waste PET is developed under finite solution volume conditions. An analytical solution is obtained for the model…
Thermostructural composites (TSC) improvement is one of the key factors to ensure future competitiveness of aeronautical and space engines. The TSC technology developed in Snecma Propulsion Solide is based on continuous fiber‐reinforced composites and carbon or ceramics matrices deposited by chemical vapor infiltratio…
One of the most versatile and widely used methods of forming surfaces with position-dependent wettability is that conceived by Chaudhury and Whitesides more than a decade ago [Science 256, 1539 (1992)]. In this paper we review several projects that utilize this gradient-forming methodology for: controlled of depositio…
With increasing demand for automobiles in the global market, and a simultaneous pressure to address the issue of sustainability, there is continuing need for the incorporation of natural fiber based materials into automotives. The focus of recent research has been to produce compostable cotton fiber-based composites t…
The conduction mechanism in microcrystalline cellulose (MCC) tablets at varying relative humidity (RH) has been investigated by using the techniques of low frequency dielectric spectroscopy and transient current analysis at room temperature. The dependence on RH on the measured conductivity and charge carrier density…
In order to improve the performance of semiconductor thermoelectric power generators, a high figure of merit Z of both material and generator system has been a target for a long time. In this technical brief, it is demonstrated that a higher value of Z does not always guarantee better generating performances because o…
Abstract Double‐walled carbon nanotubes (DWCNTs) are studied using in‐situ visible–near‐infrared (vis‐NIR) and in‐situ Raman spectroelectrochemistry. Electrochemical vis‐NIR spectroscopy reveals a complex picture of DWCNTs due to the overlap of the features of the inner and outer tubes and possible optical transitions…
Abstract Thermal decomposition in air of the series of complexes [Co(NH 3 ) 6 ][Ln(dipic) 3 ] · x H 2 O, [Cr(en) 3 ][Ln(dipic) 3 ] · y H 2 O and [Cr(urea) 6 ][Ln(dipic) 3 ] · z H 2 O (Ln = La – Lu, excluding Pm but plus Y; dipic = 2,6‐pyridinedicarboxylate) to give oxide phases has been examined. The products were cha…
Prolonging gene expression in skin using safe, nonviral gene delivery techniques could impact skin regeneration and wound healing, decrease infection, and potentially improve the success of tissue-engineered skin. To this end, an injectable, agarose-based delivery system was tested and shown to prolong nonviral gene e…
Acrylonitrile-Butadiene-Styrene (ABS), polycarbonate (PC) and their alloys are an important class of engineering thermoplastics that are widely used for automotive industry, computer and equipment housings. For the process of recycling mixtures of ABS and PC, it is desirable to know how sensitive the blend properties…
We present a theoretical investigation on the chemical addition patterns governing the fluorination of single wall carbon nanotubes. Monte Carlo calculations based on a Hückel model suggest that fluorination is stabilized in a bandlike pattern due to electronic confinement effects on the tube bond network topology. Ab…
In this study, mechanical properties and hand values are predicted from the parameters of weave structures. To promote the design of woven fabrics, we can define the crossing-over firmness factor (CFF) and the floating yarn factor (FYF) as the parameters of the weave structures for predicting mechanical properties and…