Materials Literature
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The tensile deformation and fracture behavior of commercially available low-density polyethylene (LDPE) films, having different molecular characteristics, was studied. Submitting samples to specific thermal histories controlled the morphological structure of these semicrystalline polymers. Phase-structure analysis of…
Polycarboxylic acids have been used as crosslinking agents for wood pulp cellulose for improving paper wet strength. Our previous research showed that low-molecular-weight polymeric carboxylic acids are effective in improving paper wet strength retention and reducing its flexibility. In this research, we compared two…
Jute yarns treated with MMA + MeOH solutions were irradiated either with Co-60 gamma source or with UV radiation. In gamma radiation, polymer loading of MMA (methyl methacrylate) onto jute increased quite substantially, but the strength of the composite decreases sharply after 15% polymer loading. The gamma-treated ju…
We have investigated spreading of superfluid $^{4}$He on top of polished MgF$_2$ and evaporated SiO$_{2}$ substrates. Our results show strongly varying contact angles of 0 - 15 mrad on the evaporated layers. According to our theoretical calculations, these contact angles can be explained by a spatially varying distrib…
Within the framework of mean field theory, we examine the phase transitions in Ising magnetic films and superlattices. By transfer matrix method, we derive two general nonlinear equations for phase transition temperatures of Ising magnetic films and superlattices, respectively. The equations can be applied to the film…
A model of elastic bounded diffusion is presented for the quantitative analysis of the dynamics of redox probes borne by the loose ends of linear and flexible polymeric chains terminally grafted to building blocks of a self-assembled construction. Experimentally, poly(ethylene glycol) chains bearing a ferrocene probe…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStructural Characterization of Meso Aryl SapphyrinsAlagar Srinivasan, Anand V. G, S. Jeyaprakash Narayanan, Simi K. Pushpan, M. Ravi Kumar, Tavarekere K. Chandrashekar, Ken-ichi Sugiura, and Yoshiteru SakataView Author Information Department of Chemistry, Indian Institute of Te…
CuO x /ZrO 2 samples prepared by adsorption from copper solutions or by impregnation were characterized by means of FTIR, XPS, ESR, DRS, volumetric CO adsorption, and redox cycles with H 2 and O 2 . In samples prepared by adsorption, the maximum copper uptake corresponded to an extended plateau at 2.5 atoms nm -2 . In…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPatterned Growth of Well-Aligned Carbon Nanotubes: A Photolithographic ApproachYongyuan Yang, Shaoming Huang, Huizhu He, Albert W. H. Mau, and Liming DaiView Author Information CSIRO Molecular Science, Bag 10 Clayton South, Victoria 3169, Australia Cite this: J. Am. Ch…
In this paper we examine the effect of solvent on the optical extinction spectrum of periodic arrays of surface-confined silver nanoparticles fabricated by nanosphere lithography (NSL). By use of NSL, it is possible to systematically vary the out-of-plane height of the nanoparticles, and by thermal annealing, we can c…
A time temperature transformation (TTT)-diagram with respect to the formation of intermetallie phase in the range 700-1000°C has been assessed by point counting for a 29Cr-6Ni-2Mo-0.38N super duplex stainless steel. Using a computer program developed by the authors a continuous cooling transformation (CCT)-diagram was…
Stress corrosion cracking (SCC) susceptibility of nitrogen alloyed Type AISI 301 stainless steels in 50% CaCl 2 solution at 373 K (100°C) under open-circuit potential and cathodic polarisation conditions was studied using a constant load test method. The electrical properties of the surface films formed were monitored…
Superaustenitic stainless steels with about 6% molybdenum (Mo) have now been used successfully for over twenty years because of their high corrosion resistance. Requirements for even better performance have resulted in more highly alloyed superaustenitic steels, also with high nitrogen (N) levels. Substituting W for M…
While the recrystallisation mechanisms and texture development of cold rolled single phase materials especially those of ferritic steels, and to lesser extent, those of austenitic steels are well known and investigated [1,2], the recrystallisation in duplex and super duplex stainless steels was much less subject of re…
Starting from the electrostatic part of the intermolecular multipole interaction energy we derived irreducible spherical tensor formulas for the first-order long-range, interaction-induced first and second pair hyperpolarizabilities ΔβLM and ΔγLM for arbitrary shape monomers. For atoms a general relation is obtained f…
Precipitation in a superaustenitic stainless steel of composition 24Cr-22Ni-7.3Mo-3Mn-0.5N (wt%) has been investigated. Heat treatment at 1050°C for 5 min caused a precipitate structure fairly well resembling that observed in the heat-affected zone after welding. Four different types of precipitates were identified: σ…
We present a detailed experimental and modeling investigation of poly(ethylene-4,4‘-biphenyl dicarboxylate) (PEBB) and the related random copolymers poly(ethylene-4,4‘-biphenyldicarboxylate- co -2,6-naphthalene dicarboxylate) (PEBB/EN). We find that different polymorphs exist for the PEBB homopolymer and suggest a sec…
Unique characteristics were observed in phase-type gratings that were formed in a polymer azobenzene liquid-crystal (PALC) film. Generation of sinusoidal variation of the surface of the film was confirmed by atomic force microscopy. However, comparison of the diffraction efficiency with the surface modulation revealed…
The crystal structure of the fatty acid elongating enzyme beta-ketoacyl [acyl carrier protein] synthase I (KAS I) from Escherichia coli has been determined to 2.3 A resolution by molecular replacement using the recently solved crystal structure of KAS II as a search model. The crystal contains two independent dimers i…
This paper reviews the development of nitrogen alloyed stainless steels. Nitrogen alloying of austenitie stainless steels started at an early stage and was to a large extent caused by nickel shortage However, direct technical advantages such as increased strength of the nitrogen alloyed steels made them attractive alt…