Materials Literature
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Abstract Particle‐dispersed melting is a complex but important melting mechanism in the corotating twin‐screw extruder. In this study, the complex multi‐particle‐dispersed system was simplified into a single‐particle melting model. The finite‐difference method was introduced to solve this problem. The simulation resul…
Abstract The diffusion, solubility, and permeability behavior of oxygen and carbon dioxide were studied in amorphous and semicrystalline syndiotactic polystyrene (s‐PS). The crystallinity was induced in s‐PS by crystallization from the melt and cold crystallization. Crystalline s‐PS exhibited very different gas permea…
Abstract Small‐angle X‐ray scattering (SAXS) gives information on lamellar stacks in semicrystalline polymers. SAXS experiments have been used to follow the melting transition that occurs over a temperature range of 10 °C or more. One common feature is the increase in the average period by 50–100% during the melting p…
PURPOSE: To investigate the interpolymer complexation between Carbopol 934P (CP) and various grades of polyvinylpyrrolidone (PVP) (K90, K32, C15, and VA/S-630). METHODS: Amount of fresh and dried CP-PVP complexes, water retaining capacity, apparent density, pH, conductivity, FTIR, swelling and adhesion strength were s…
We have performed a simulation analysis of the pseudoelastic behavior of a NiTi shape memory alloy wire placed in air, subjected to tensile cyclic loads over a range of low strain rates. Thermomechanical interactions, such as energy dissipation, latent heat and heat transfer, are accounted for in a one-dimensional the…
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…