Materials Literature
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Polyurea microcapsules containing 2- chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl) acetamide as the active agent were prepared by the method of interfacial polycondensation with methylene bis(phenyl isocyanate) the multifunctional isocyanatae, hexamethylene diamine as the diamine, and anionic (SLS) as the emulsifying…
Temperature programmed thermal desorption spectrometry (TPD) is used to study kinetics of molecular hydrogen release after sorption of hydrogen atoms. A sharp decrease of hydrogen release rate is observed if linear heating of the sample is interrupted at any intermediate temperature. A similar behaviour of release cur…
By using a vertical sectioning method (VSM) or secondary electron line scanning method (SELSM), the fractal dimension DS for surface, DL for scanning profile were measured quantitatively on some typical fracture surfaces, namely cleavage fractures, dimple fractures and fatigue fractures of composite materials. It was…
The crystallization mechanism of Al-TS-1 zeolite has been investigated using amorphous wetness-impregnated Al2O3–TiO2–SiO2 xerogels as raw materials. Samples with different degrees of crystallinity have been prepared and characterised by means of conventional techniques. The catalytic activity of the Ti and Al centres…
A hierarchy of mechanism-based phenomenological models, comprising linear, piecewise-linear, and nonlinear springs and friction elements, are presented for the pseudoelastic damping behavior of Shape Memory Alloys. The constitutive equations and a method for identifying the model parameters from experimental hysteresi…
Ultrafine-grained structures, having grain size of 1μm or less in diameter have shown high rate superplasticity at lower temperatures compared to the conventional superplastic forming conditions. Many techniques have been developed to produce the ultrafine-grained structures primarily by severe plastic deformation, wh…
Low-temperature sintering of PZT was studied with the use of LiBiO2 (LBiO) as a sintering aid. PZT powders with LBiO additive were densified at 750°C for 2h to sintered bodies with relative density of 95%. Addition of the sintering aid was effective for improving the sinterability of PZT powders and piezoelectric/ferr…
Formation of Au nano-particles on TiO2(110) from a gold–phosphine complex Au(PPh3)(NO3) was studied by environment-controlled atomic force microscopy (AFM). The Au complex began to agglomerate as particles larger than 4.2 nm in height on calcination in dry air at a temperature as low as 363 K. The size of the agglomer…
Bis-(3-hydroxypropyl) 2,6-naphthalenedicarboxylate (BHPN) was polymerized to poly(trimethylene 2,6-naphthalenedicarboxylate) (PTN) in the presence of various catalysts. The order of the catalytic reactivity was Sb(III) < Zr(IV) < Sn(IV) < Ti(IV). The influence of temperature and catalyst concentration on the propertie…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation M. Steigerwald; MeV Mott Polarimetry at Jefferson Lab. AIP Conf. Proc. 1 June 2001; 570 (1): 935–…
The hydrogen storage capacity in mechanically treated single wall carbon nanotubes (SWNTs) is investigated in this paper. In order to open the nanotubes three mechanical methods were applied: ball milling, ultrasonication and rubbing. Changes induced by the treatment were analyzed by Raman spectroscopy. The amount of…
MPB for repair of concrete was prepared by proportionally mixing burned MgO powder(M) with NH 4H 2PO 4 powder(P) and setting modifying admixtures. It has excellent properties such as rapid setting with high strength, high bonding strength to old concrete and so on. The study was focused on the key factors influencing…
It is well known that water treeing in polyethylene (PE) is sensitive to frequency, but there is not yet a reliable analytic model describing this empirical observation. We show from existing published data that the length L of water trees grown in the laboratory under one given ionic solution varies linearly when plo…
The methods currently used to study the bulk and surface transport properties of insulators usually consist of charging the sample by corona or electrons, and monitoring the natural decay of the surface potential or its buildup after a temporary short circuit (return potential). These measurements have become quite ea…
Copolyimide thin film, which has low-level stress and stress relaxation induced by water sorption, was characterized for potential applications as an encapsulant, a stress-relief buffer, and in interlayer dielectrics. The polyimides examined were poly(p-phenylene pyromellitimide) (PMDA-PDA) and poly(p-phenylene biphen…
For the actively cooled first wall panels of the W7-X stellarator under construction at Greifswald, Germany, boron carbide (B 4 C) coatings with a thickness up to 500 µm are being developed as plasma facing surface on the stainless steel component. Different coating technologies (vacuum plasma spray (VPS), atmospheric…
During the last fifty years blending of dissimilar polymers has been a major path to tailor materials with new properties in industry. Especially in the area of engineering thermoplastic materials this approach has led to a significant number of large volume products, like Polyphenyleneether/High Impact Polystyrene-bl…
Increasing the time allowed for hydrothermal crystallisation during high temperature (150 °C) synthesis of MCM-41 appears to result in some ordering (nanocrystallites) within the pore walls which is accompanied by increase in pore wall thickness, pore size, silica condensation and the formation of elongated or rod-lik…
This work employs X-ray diffraction, X-ray reflectivity, and transmission electron microscopy, along with electrical (sheet resistance and resistivity) and bending-beam stress analyses, to characterize the intrinsic properties and barrier behavior of 40 nm thick thin films of sputter-deposited single-layered Ta 2 N ,…
Domain switching behavior of sol-gel derived PZT thin films at high frequencies has been investigated for ferroelectric memory applications by measuring P-E hysteresis curves as a function of frequency. The coercive field (Ec ) of the PZT thin films strongly depended on the measuring frequency, nevertheless their rema…