Materials Literature
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We report a detailed experimental study of the kinetics of separation into coexisting gas, liquid, and crystal phases in a colloid-polymer mixture. Distinct kinetic regimes are identified, and interpreted in terms of the underlying "free-energy landscape" of the system.
We report a ${}^{139}\mathrm{La}$ NMR investigation of low-doped insulating manganite samples ( ${\mathrm{LaMnO}}_{3+\ensuremath{\delta}}$ and ${\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{Ca}}_{y}{\mathrm{MnO}}_{3+\ensuremath{\delta}}$) as a function of temperature. A volume fraction with fast nuclear relaxations was rev…
Mathematical formulae are modified for the shape of multiple-beam Fizeau fringes in transmission to determine the mean refractive indices and birefringence of highly oriented fibres. These modified mathematical formulae are applied with the multiple-beam interference method to determine the optical anisotropy of polyp…
Lamellar structure formed by melt crystallization of binary mixtures of monodisperse long n -alkanes C 122 H 246, C 162 H 326, C 194 H 390, C 210 H 422, C 246 H 494, C 258 H 518, and C 294 H 590 was studied by small-angle X-ray scattering (SAXS) and thermal analysis. A semicrystalline form (SCF) was found to be the st…
Abstract A small‐angle x‐ray scattering (SAXS) technique using synchrotron radiation as the x‐ray source has been employed to characterize the microstructure of mesoporous silica prepared by one‐pot template‐directed synthesis methodology. The scattering of pure silica agreed with Porod's law. The scattering of organo…
Abstract The reactive pulsed laser deposition technique was used to deposit carbon nitride (CN x ) coatings on a silicon substrate. In this process, an infrared transversely excited atmospheric pressure CO 2 laser ablation of a graphite target in a remote nitrogen plasma afterglow was used to provide simultaneously bo…
Abstract The oxidation of thin‐film Au‐ Al alloy, as well as pure Al, has been studied using XPS across a wide range of water vapour and air exposures (0.1 L to 1 × 10 14 L). The alloys and the pure Al all undergo a similar set of oxide growth kinetics. In addition to the three stages of early growth kinetics identifi…
Three integrated composites were prepared using plasma polymerization (PP) as a synthetic step. Concentric-tubular Au/polymer composites were prepared by combining the template method and PP. High porosity in the Au nanotubules was seen for the first time with SEM. PP was also used to produce tailored coatings for mic…
Radioactive waste treatment process usually involves concentration of radionuclides before waste can be immobilized by storing it in stable solid form. Foaming is observed at various stages of waste processing like SRAT (sludge receipt and adjustment tank) and melter operations. This kind of foaming greatly limits the…
Transparent, flexible, and luminescent Eu 3+ -doped siloxane−poly(ethylene glycol) (PEG) nanocomposites have been obtained by the sol−gel process. The inorganic (siloxane) and organic PEG phases are usually linked by weak bonds (hydrogen bonds or van der Waals forces), and small-angle X-ray scattering (SAXS) measureme…
Dynamics of water contained in the pores of alumina gel as studied using a combination of the high and medium resolution quasi-elastic neutron scattering (QENS) technique at room temperature and extending to the supercooled region is reported. In the single particle picture of the dynamics of water molecules in confin…
In this work, we describe a new type of composite material made from segmented-polyurethanes and silica. The silica is incorporated into a hard segment phase of the segmented polyurethane to make a “hybrid domain”. The composite formation between segmented polyurethane and silica was prepared via a general sol−gel pro…
Thoroughly revised and updated, the third edition of this popular textbook continues to provide a comprehensive coverage of the main construction materials for undergraduate students of civil engineering and construction related courses. It creates an understanding of materials and how they perform through a knowledge…
In this paper, the dielectric and piezoelectric properties of sol-gel derived and microwave sintered PZT are presented. It has been observed that the microwave sintering results in a material with a higher dielectric constant (≈1600) than that sintered by conventional methods (≈1480). It also offers a low dielectric l…
Two aldehydes, 2,6-diacetamido-4-formylpyridine (7) and 1-butyl-6-formyluracil (11), are used to synthesize five pyridyl and four uracyl meso-subsituted porphyrins. With these complementary porphyrin building blocks, it is possible to build various types of multi-porphyrin supramolecules with different spatial relatio…
Abstract In this work we develop simple equations, suitable for the analyst, based on the Monte Carlo calculations of Jablonski, for the corrections arising from elastic scattering. These concern modification of the angular anisotropy in XPS and the absolute intensities in both Auger electron spectroscopy (AES) and x‐…
A highly active solid superacid of sulfated tin oxide was prepared from tin oxide gel, which was precipitated by the hydrolysis of SnCl 4 and washed with aqueous ammonium acetate solution, followed by exposure to aqueous sulfuric acid and calcining. Differencial thermal analysis suggested that the acetate ion remainin…
As a first approach to the motion of particles in anisotropic liquids, we study the Stokes drag of spherical particles in three different nematic environments: a uniform director field, the Saturn-ring configuration, and the dipole configuration. Two independent friction coefficients for the respective motion parallel…
We report a detailed study of the magnetic and magnetotransport properties of Sr 2 FeMoO 6 ceramics having a controlled concentration of antisite (AS) defects. It is found that a high-field differential susceptibility exists in all samples, which increases with AS. Similarly, a high-field magnetoresistivity develops a…
The energy levels of CdSe quantum dots are studied by scanning tunneling spectroscopy. By varying the tip−dot distance, we switch from “shell-filling” spectroscopy (where electrons accumulate in the dot and experience mutual repulsion) to “shell-tunneling” spectroscopy (where electrons tunnel, one at a time, through t…