Materials Literature
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We report studies of random sequential adsorption on the pre-patterned Bethe lattice. We consider a partially covered Bethe lattice, on which monomers and dimers deposit competitively. Analytical solutions are obtained and discussed in the context of recent efforts to use pre-patterning as a tool to improve self-assem…
Nanostructures of polyaniline (PAni) and polypyrrole (PPy) with controlled morphologies have been synthesized on atomically flat surfaces using adsorbed surfactant molecules as templates. Atomic force microscopy (AFM) has been used to investigate polymer film formation on highly oriented pyrolytic graphite (HOPG) and…
Binary blends of linear low-density polyethylene (LLDPE) and a series of highly photoluminescent (PL) 1,4-bis(α-cyano-4-alkoxystyryl)benzenes were prepared using melt-processing techniques. It was shown that the phase behavior of these blends, which comprised 0.01−3% w/w of the PL guest, could be controlled via the mo…
We report a new family of oligomeric alkyl phosphine ligands for nanocrystal quantum dots. These oligomeric phosphines show effective binding affinity to quantum dot surfaces. They form thin and secure organic shells that stabilize quantum dots in diverse environments including serum and polymer matrices. They maintai…
High-precision crystal structure parameters have been determined from Rietveld refinement of high-resolution neutron powder diffraction data in Nd 3 (Fe,Ti) 29 and Nd 3 (Fe,Ti) 29 N x intermetallics. The construction of the corresponding Wigner–Seitz (WS) polyhedra has revealed that some 12-fold (group-A) environments…
Abstract The crystallization behaviors and crystalline morphologies of initial and chain‐extended nylon 66 samples were studied with differential scanning calorimetry and polarizing microscopy, respectively. The crystallization rate increased and the size of the spherulites decreased with chain‐extension. In addition,…
Core and valence level photoemission spectra of β- and cubic-Si3N4 have been measured under monochromatic Al Kα excitation. Strong satellites to high binding energy of the core lines are shown to arise from excitation of valence electron plasmons during the photoemission process. An increase in the plasmon energy from…
Abstract Packaging‐related properties of coated films of chitosan–acetic acid salt and whey protein concentrate (WPC) were studied. Chitosan (84.7% degree of deacetylation) and WPC (65–67% protein) were solution cast to films. These films are potential oxygen barriers for use in packaging. Coatings of wax or alkyds we…
We report measurements of angle-resolved light scattering in porous silicon films. Scattering rings were observed, and their aperture allowed to measure optical birefringence. These values are confirmed with other techniques. We study birefringence changes when pores are filled with liquids, after thermal annealing, a…
We have investigated the adsorption of hydrogen of multiwall carbon nanotubes synthesized by the pyrolysis method using a lanthanum nickel hydrogen storage alloy as a catalyst. The mechanism of carbon nanotubes synthesized using a La–Ni alloy catalyst is discussed. In the hydrogen atmosphere and high-temperature proce…
Clustering of Mg in Al–Mg binary alloys is studied by means of atomistic simulations. The phenomenon is analysed in the undistorted Al lattice, as well as in the presence of dislocations. In the undistorted lattice, Mg has a tendency to cluster in a coherent phase. The binding energy of this structure is rather low an…
Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules have been prepared by means of arc discharge in argon and methane, respectively. In the Gd nanoparticles, gadolinium oxide was detected by x-ray diffraction, while the presence of metallic gadolinium was proved by oxygen analysis and x-ray photoelectron spectra.…
Under a static high magnetic field of 10 T, diamond-like carbon (DLC) nanocrystals and graphite-coated n-diamond nanoparticles have been synthesized after a pyrogenation of carbon black and a nanometre-sized iron catalyst at atmospheric pressure and a temperature of 1100 °C. The product is analysed by x-ray diffractio…
Molecular dynamics simulations are performed to study the lithium jumps in ${\mathrm{LiPO}}_{3}$ glass. In particular, we calculate higher-order correlation functions that probe the positions of single lithium ions at several times. Three-time correlation functions show that the nonexponential relaxation of the lithiu…
After a decade of intensive materials discovery and optimization, no single transparent conducting oxide has exceeded the intrinsic electrical performance limits suggested in 1992. High mobility oxide (HMO) structures are proposed as an alternative design that can surpass single material performance. Based on oxides w…
Abstract Polypropylene (PP)/Ti‐MCM‐41 nanocomposites were prepared by isospecific propylene polymerization with Ti‐MCM‐41/Al( i ‐C 4 H 9 ) 3 catalyst. The cross polarization/magic angle spinning (CP/MAS) 13 C NMR spectrum of the composite was similar to that of the conventional isotactic PP, and the decrease in the po…
Inverter supply is known to create additional power losses in an induction machine over those occurring with grid supply. The extent and nature of that increase are examined here for a switching frequency representative of current practice. Data are obtained from a time-stepped finite element analysis (FEA) model of t…
Electrostatic levitation together with multibeam heating and ultraviolet imaging overcame contamination, imaging, and sample position stability problems associated with handling of liquid tantalum and rhenium. Here, the density [ρ(T)] of these metals is reported in the superheated and undercooled states. Over the 2760…
Samples of Co0.1Ti0.9O2−δ (anatase) prepared by the sol–gel technique are found to be paramagnetic at room temperature, with the magnetic susceptibility following Curie–Weiss law in the investigated range of 2–370 K. However, transformation from paramagnetism to room-temperature ferromagnetism (RTFM) is observed by hy…
Effects of praseodymium modification on the crystal structure and polarization properties were investigated for layered ferroelectric SrBi2Ta2O9 (SBT). Neutron powder diffraction and x-ray photoelectron analyses showed that praseodymium ions are substituted at the Sr site as Pr3+ and that Sr vacancies are created for…