Materials Literature
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Wholly aromatic rod-rod type di- and triblock molecules, oligo(ether sulfone)-b-oligo(ether ketone)s (OES-OEK), were synthesized to study a solid-state self-assembled nanostructure. The OES and OEK segments in the block molecules form segregated crystalline domains. The energy-filtering transmission electron microscop…
Power electronics system is generally comprised of electrical and magnetic circuits. Nowadays, there were a lot of research works on circuit topologies ranging from single switch converter to soft-switching topologies, but the most difficult problems encountered by many design engineers were magnetic issues, such as c…
Polycrystalline cubic silicon carbide layers, undoped and codoped with nitrogen and boron, have been grown via thermal decomposition of methyltrichlorosilane vapor in hydrogen, and their transport properties (electrical conductivity, thermoelectric power, and thermal conductivity) have been studied in the temperature…
Indium-zinc oxide (IZO) films were grown on glass substrates by rf magnetron sputtering using targets of 50mol% In2O3–50mol% In2O3(ZnO)3 and In2ZnkOk+3 (k=3, 4, 5, and 7) at room temperature and 300°C. The difference in Zn content between the films and the sputter targets varied with the growth temperature. The struct…
Four new pregnane glycosides, tenacigenosides A–D (1–4), along with six known pregnane aglycones and five known pregnane glycosides, were isolated from the stems of Marsdenia tenacissima (Roxb.) Wight et Arn. (Asclepiadaceae). The chemical structures of the new compounds were established by 1D- and 2D-NMR as well as H…
The corrosion rate of copper produced by lithium bromide (LiBr) concentrated solutions of 400 g/L and 700 g/L (4.61 M and 8.06 M) at room temperature, 70°C, and 110°C was studied using immersion testing. The corroded copper concentration was determined with two techniques: weight loss and differential pulse polarograp…
The surface friction property changes of nonwovens under repetitive abrasions were observed. Surface data were acquired using a three-dimensional noncontact camera and fractal dimensions were calculated to evaluate surface roughness. The fractal dimension showed a tendency to increase with the number of abrasions. The…
Accuracy and resolution of scanning electron microscopy and an electron-beam lithography system directly depend on beam diameter; it should be monitored and tuned frequently. A technique is described to determine beam size using an automatic procedure. In the developed method, a specially designed and fabricated test…
Purpose To develop a method for the preparation of multi‐walled carbon nanotube reinforced low density polyethylene (LDPE) composites (MWNTs/LDPE), based on ultrasonic vibration, solution casting and melt mixing. Design/methodology/approach The preparation for MWNTs/LDPE composites was carried out by vibration of carb…
This work investigates the influence of sensitization conditions on pitting corrosion resistance of ferritic stainless steel UNS S43000 aged at 800°C between 10 min and 320 min. UNS S43000 steel is susceptible to intergranular corrosion after solution treatment at 1,160°C followed by water-quenching, as a consequence…
It is shown from both a phenomenological study and exact modeling that the reason for the experimentally observed substantial (a few angstroms or nanometers) separation in wavelength between the maxima of the inside (negative numbered) and outside (positive numbered) diffraction orders of a multilayer-coated grating,…
Alternatives to traditional antibiotics and to antiviral and anti-inflammatory drugs are much in need and the molecular design and development of anti-infective compounds constitute a pivotal area in modern medicinal research. Dendrimers are a relatively new class of structurally well-defined, i.e. monodisperse, synth…
Electron-microprobe analyses of hydroxylellestadite from the Cioclovina Cave (Romania) gave the composition Ca 10.27 [(SiO 4 ) 2.53 (SO 4 ) 2.17 (PO 4 ) 1.27 ] Σ=5.97 [(OH) 1.66 F 0.21 Cl 0.16 ] Σ=2.03 . The mineral is translucent to transparent, light orange, slightly fluorescent, has a vitreous luster and <1.5 mm…
The authors present the use of electron beam induced deposition (EBID) for direct wiring of carbon nanotubes (CNTs). Since this technique is a maskless, direct patterning method, EBID is applicable to suspended nanotubes potentially integrated in predefined nanoelectromechanical systems (NEMS). The authors developed a…
The results of both experimental studies and molecular dynamics simulations indicate that crystals exhibit strong size effects at the sub-micron scale: smaller is stronger. Until recently, experimental aspects of nano-scale deformation involved the effects of strain gradients, constraints of neighboring layers, grain…
Electrical breakdown of short (∼50nm) multiwalled carbon nanotubes (MWNTs) is studied utilizing mechanically controllable break junction technique with gold electrodes. Measurements of the conductance-bias characteristics near the breakdown point revealed two different types of breakdown behavior for the short MWNTs.…
The ethylene–propylene–diene terpolymer (EPDM) foam article was prepared by mixing a compound in a two roll mill, extruding the compound through a cold feed extruder and finally vulcanising the extrudate in a circulating hot air oven. The blowing kinetics of EPDM compounds was studied using a moving die rheometer, and…
Abstract Dynamically vulcanized nanocomposite thermoplastic vulcanizates (NC‐TPVs) based on ethylene‐propylene‐diene rubber (EPDM) and melt intercalated hybrid of poly(propylene) (PP)/maleic anhydride grafted poly(propylene) (PP‐g‐MA) with organo‐modified montmorillonite (org‐MMT) were prepared. X‐ray diffraction (XRD…
Fisher model of intercrystalline diffusion is refined based on an analysis of previously obtained results of emission Mössbauer studies of grain boundaries. It is shown that under conditions of dominating intercrystalline diffusion, the existence of monatomic near-boundary layers of equilibrium composition should be t…
The index of refraction in the isotropic phase, n, and in the mesophase, n o , for pure 5CB and 8CB liquid crystals, as well as their binary mixtures, were measured as a function of temperature. The related parameters, namely the orientational order parameter (S), relative polarizability anisotropy (ζ), and molecular…