Materials Literature
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We report on the fabrication, Raman characterization and electron emission behavior of cold electron cathodes that are specifically designed to be used in miniature X-ray sources. The cathodes are fabricated by screen-printing a nanocomposite paste comprising multiwall carbon nanotubes as fillers in a matrix of graphi…
Combustion of magnesium produces copious ultraviolet and visible light emissions. The ultraviolet emission can be employed potentially in an antibacterial capacity. Ultraviolet radiation from the combustion of a heavily laden flow of magnesium powder with air was measured in a linear test combustor fitted with optical…
Abstract The synthesis, structures, and ring‐opening polymerization (ROP) activity of new dimethyl‐ ansa ‐ and ‐non‐ ansa ‐zirconocene complexes are reported. The substituted indene precursors 1‐C 9 H 7 R [R = CH 3 ( 1 ), CH 2 Ph ( 2 ) and C 2 H 4 (C 4 H 7 O 2 ) ( 3 )] were synthesised by treating RBr [R = CH 2 Ph and…
It still remains a crucial challenge to control actively the structures of carbon nanotubes (CNTs) such as the alignment, length, diameter, chirality, and the number of walls. The properties of CNTs are highly dependent on the structures. There is a strong demand for invention of some innovative methodology to precise…
Abstract Molecular‐dynamics simulations of 5 nm‐thick atactic‐polystyrene films have been used to study the influence of cyclic‐shear deformation on the stress–strain behavior and local segmental mobility. Upon cyclic yield the stress–strain behavior of the films slowly evolves towards a steady state which is characte…
Abstract In this work, a starch–water mixture was blended with polyurethane prepolymer (PUP) at 0, 5, 10, 15, and 20 wt% and extruded in a twin screw extruder. The ensuing results showed that the reaction ratio of PUP used for modified starch was 98.6 ± 0.3%. This was attributed to the polyurethane particles being for…
Molten magnesium can oxidize rapidly in atmospheres containing oxygen. During the casting and handling of molten magnesium, it is essential to protect the melt from ignition. The protective gas normally contains air and/or CO2, and with a small amount of an inhibiting agent. This study examined the minimum amount of S…
Solidvapor deposition was used to synthesize nanocrystalline PbS thin films on a Si (100) substrate. Lead sulfide (PbS) powder was first prepared and then heated to 1050 °C in a tube furnace. The resulting vapor was carried to the substrate zone by an argon flow. The structure of the nanocrystalline PbS thin films was…
Activated carbons were prepared from coconut shells by using carbonization at 600 °C for 2 h followed by water steam activation. Effects of activation temperature, hold time and water steam amount on the yield, BET surface area and micropore volume of activated carbons were evaluated. The pore structure of the activat…
We report here the graphoepitaxial alignment of a lamellar forming PS-b-PMMA block copolymer (BCP) for directed self-assembly using topographical patterns (simple line structures) of hydrogen silsesquioxane (HSQ). The system demonstrates the importance of the sidewall chemistry on translational alignment of BCP domain…
We report that proteins labeled with fluorescein-doped silica nanoparticles (FSNPs) showed drastically different fouling behavior than those labeled with the fluorescein dye. Arrays of polymer films were covalently immobilized on silicon wafers and were treated with protein conjugated on FSNPs. Fluorescence imaging sh…
Ab initio molecular dynamics simulations and the approach of generalized collective modes are applied for calculations of spectra of longitudinal and transverse collective excitations in molten LiBr. Dispersion and damping of low- and high-frequency branches of collective excitations as well as wave-number dependent r…
In this paper, development and electrical characterization of sisal powder filled polyvinyl alcohol (PVA) composites is reported. Dielectric measurements were conducted on these composites on a LCR meter in the temperature range from 30 to 150°C and in the frequency range 1 kHz - 10 kHz. The effects of temperature and…
Abstract Natural fibers such as jute fiber and biodegradable poly(lactic acid) (PLA) polymer are very good choices for environmental friendly material. Multi‐gate injection is often used to meet the demand of mass production of injection moldings, therefore weld line is inevitable. The presence of weld lines not only…
In this study, we investigate the mechanical characteristics of transfer-printed quantum dot (QD) arrays. Transfer printing of a spin-coated QD array by elastomers results in changes of the mechanical properties of the QD films since QDs encapsulated by organic aliphatic ligands can be deformed by physical forces such…
Al oxide (Al-O) films used as catalyst-support layer for vertical growth of carbon nanotubes (CNTs) were characterized by means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission, and scanning electron microscopies (TEM and SEM). EB-deposited Al films (20 nm) were thermally-oxidized at 40…
The growth of single-walled carbon nanotubes (SWCNTs) with predefined structure is of great importance for both fundamental research and their practical applications. Traditionally, SWCNTs are grown from a metal catalyst with a vapor-liquid-solid mechanism, where the catalyst is in liquid state with fluctuating struct…
Inherent chemical programmability available in peptide-based hydrogels has allowed diversity in the development of these materials for use in biomedical applications. Within the 20 natural amino acids, a range of chemical moieties are present. Here we used a mixing-induced self-assembly of two oppositely charged pepti…
Passivated nanoparticles of europium(III)-doped yttrium, lanthanum and gadolinium oxides were synthesized by a modified sol–gel method and their luminescent properties were studied. The passivation of the nanoparticles surface is confirmed by infrared spectroscopy. Gadolinium and yttrium oxides crystalize as cubic pha…
Novel basket-shaped molecules having calix[4]arene as central rigid core possessing azomaterial in outer space unit in the lengthening arm were synthesised and characterised by elemental analysis and different spectroscopic methods such as Fourier Transform Infrared (FT-IR), electron spin ionization (ESI)-MASS, 1H nuc…