Materials Literature
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Rotor Speed is an important factor which impacts the mixing process and quality of mixed rubber greatly. The effects of different rotor speeds on manufacturing process of short fiber-rubber composite material have been studied by experimental study. In the experiments, the rotor speeds were 50rpm, 60rpm, 70rpm and 80r…
O desenvolvimento de nanocompósitos para recobrimento de superfícies de partículas tem sido alvo de inúmeras pesquisas, devido ao fato de que novas e incomuns propriedades físicas e químicas, ausentes em tamanho macro e microscópico, são observadas nesses novos nanomateriais. Este trabalho apresenta o procedimento de…
Hardness and toughness are the main properties determining wear resistance and performance of high speed steel tools. The objective of the present paper was to study the effect of hardening conditions on the toughness of high speed steels, mainly concerning the hardening temperature and cooling rate during quenching.…
The effect of surfactants on the solubility and intrinsic dissolution rate of sparfloxacin was investigated at room temperature. The surfactants used in the study were anionic sodium lauryl sulfate (SLS) and nonionic polysorbate 80 (Tween 80). Sodium lauryl sulfate showed very significant increase in solubility Tween…
We monitored the imidization process of poly(amic acid) synthesized from pyromellitic dianhidride and 4,4′-oxydianiline,and analyzed the IR bands of the poly(amic acid) and the polyimide after thermal imidization using variable temperature FTIR spectroscopy in transmission mode.We investigated peak assignments of the…
We studied crystallization behaviors of amorphous C-Sb films to evaluate their applicability in phase-change memory. C-Sb thin-films with 92 to 50 at% Sb were deposited by co-sputtering from elemental targets. In-situ electrical resistance-temperature measurement, differential thermal analysis, and grazing-incident X-…
This paper reports that the (Ga, Co)-codoped ZnO thin films have been grown by inductively coupled plasma enhanced physical vapour deposition. Room-temperature ferromagnetism is observed for the as-grown thin films. The x-ray absorption fine structure characterization reveals that Co 2+ and Ga 3+ ions substitute for Z…
An original method of immobilization of nongrowing microorganism cells on xerogel of silicon dioxide containing insoluble hydroxyl compounds of cobalt(III) has been developed. A recombinant strain producing glucose isomerase has been constructed on the basis of Escherichia coli with the use of a gene of Arthrobacter n…
5-(8-ethoxycarbonyl-1-naphthyl)-10,15,20-triphenyl porphyrin (ENTPP) has been synthesized in a one-pot reaction, and the corresponding chiral crystalline samples have been obtained by spontaneous resolution. 1 H NMR spectrum suggests it is mononaphthyl substituted species and an ethyl group is over the porphyrin plane…
Computational methods for designing an optimal catalyst have recently received much attention, especially for energy-related applications. What is lacking in the previous methods is an explicit method to handle uncertainties in the complex models used, so that a robust design is achieved. This work proposes a stochast…
The morphologies of different commercial forms of the copolymer of tetrafluoroethylene with hexafluoropropylene (FEP) were investigated by thermomechanical analysis. Both granules and powders of FEPs have similar morphologies, but different temperatures for phase transitions. Irradiation reduces the crystallinity of t…
The reaction of Cu(Hm-dtc)(2), Br(2), and CuBr(2) yielded a new mixed-valence octanuclear Cu(I)/Cu(II)/Cu(III) cluster, encapsulating a Br anion in the center of the cluster cage. The octanuclear cluster units form a 1D assemblage, which induces intervalence charge-transfer transitions from Cu(II) ions to Cu(III) ions…
Although previous experimental studies have shown the positional preference of different amino acids (AAs) to form a stable triple helical collagen motif, the structural basis for the variations in the sequence and the positional propensity has not been systematically investigated. Thus, we have here probed the origin…
This study has been carried out to investigate the structural changes of poly(lactic acid) fibers, which may occur during the dyeing process. Four disperse dyes with long alkyl chains were used to demonstrate the effects of dyeing temperature on fiber structure. Polymer structure was studied using DSC and SAXS-WAXS te…
Theoretical calculations predict that the collapse pressure for double-walled carbon nanotubes (DWCNTs) is proportional to 1/R 3, where R is the effective or average radius of a DWCNT. In order to address the problem of CNT stability at high pressure and stress, we performed a resonance Raman study of DWCNTs dispersed…
Antimony doped nanocrystalline tin oxide (SnO 2 ∶Sb) films have been fabricated using a low cost and simple fabrication technique using a perfume atomiser. The X-ray diffraction patterns of the antimony doped tin oxide (ATO) films show that the films are polycrystalline with tetragonal cassiterite structure having (11…
Using first principles calculations, we investigate the electronic structures of semi-hydrogenated BC3, BC5, BC7, and B-doped graphone sheets. We find that all the semi-hydrogenated boron-carbon sheets exhibit half-metallic behaviors. The magnetism originates from the non-bonding pz orbitals of carbon atoms, which cau…
Electrical switching in Cu x As 40 Se 60− x glasses has been studied over a wide composition range for 0≤ x ≤32. The glasses with lower Cu concentrations ( x <15) do not exhibit switching, whereas glasses in the range 15≤ x ≤25 show a threshold type switching. The glasses in the range 26≤ x ≤29 exhibited an unusual…
The development of the X-ray divergent-beam (Kossel) technique over the last 50 years is traced. The fundamentals of this technique and ways to implement it experimentally are considered, and its potential for studying the real structure of crystals is analyzed in detail.
Gelling with each other: A new interpenetrating polymer network (IPN)-based multi-component organogel exhibited improved mechanical strength and hardness, thus predating the properties of the gels individual components.