Materials Literature
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A review of double resonance Raman spectroscopy is presented. Non-zone centre phonon modes in solids can be observed in the double resonance Raman spectra, in which weak Raman signals appear in a wide frequency region and their combination or overtone modes can be assigned. By changing the excitation laser energy, we…
We report several wet-chemical methods for synthesis of one-dimensional CuO nanostructures in water−ethanol mixed solvents at 77−82 °C and 1 atm. Single-crystalline monodispersed CuO nanorods with a selected breadth in the range of 5−15 nm have been prepared by controlling reagent concentrations. The nanorods are pref…
The effect of free surfaces on the glass transition temperature (T(g)) of thin polystyrene films was studied. Measurements were performed on films (8 nm<h<290 nm) with one free surface and on films capped with a 5 nm thick metal layer (no free surfaces). Potential problems with evaporative deposition were eliminated b…
Abstract Functional hybrids are nanocomposite materials lying at the interface of organic and inorganic realms, whose high versatility offers a wide range of possibilities to elaborate tailor‐made materials in terms of chemical and physical properties. Because they present several advantages for designing materials fo…
Semiconducting carbon nanotube transistors with channel lengths exceeding 300 microns have been fabricated. In these long transistors, carrier transport is diffusive and the channel resistance dominates the transport. Transport characteristics are used to extract the field-effect mobility (79 000 cm 2 /Vs) and estimat…
Neodymium nickelate thin films have been prepared on NdGaO3 substrates by RF magnetron sputtering and post-annealing treatment under oxygen pressure. Transport properties are found to depend strongly on film thickness. Thick films show transport properties close to bulk ceramics, while very thin films exhibit a large…
Abstract The structure, mechanical properties, and thermomechanical properties of poly(ethylene terephthalate) (PET) fibers obtained by laser‐heated drawing were investigated in terms of their dependence on the draw ratio and feed speed and the differences between neck‐drawn fibers and flow‐drawn fibers. The long peri…
Abstract For the first time, quantitative analyses of the crystallization kinetics, surface free energy of chain folding, and morphology in phenolic/poly(ϵ‐caprolactone) (PCL) binary blends have been studied. The spherulite growth rate and the overall crystallization rate depend on the crystallization temperature and…
Abstract A series of poly(1,4‐cyclohexylenedimethylene terephthalate‐ co ‐1,4‐cyclohexylenedimethylene 2,6‐naphthalate) [P(CT‐ co ‐CN)] copolymers were synthesized, and their cocrystallization behavior was investigated using differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction (WAXD). Although the…
Abstract A general procedure for deriving the equations that underlie various isoconversional nonlinear methods for evaluating the activation energy is presented. A new integral isoconversional nonlinear method with integration over a given range of conversion is suggested. This method was applied to simulated nonisot…
Nanoscale copper oxide and nickel oxide, prepared by a modified sol−gel process, were investigated for their destruction efficiencies for methanol. The activity, selectivity, and stability of nanoscale CuO and NiO were compared with those of commercial microscale CuO and NiO. Nanoscale CuO and NiO were highly active a…
We present simulations of field emission from bundles of metallic (5,5) carbon nanotubes, which are either ideally open or closed. The scattering calculations are achieved using a transfer-matrix methodology for consideration of three-dimensional aspects of both the emitting structure and the surface barrier. Band-str…
Abstract Giant and stable wormlike micelles formed in water from a series of poly(ethylene oxide) (PEO)‐based diblock copolymer amphiphiles mimicked the flexibility of various cytoskeletal filaments. The worm diameter ( d ) was found by cryo‐transmission electron microscopy to scale with the length of the hydrophobic…
High molecular weight phthalazinone containing poly(arylene ether)s, poly(arylene thioether)s, and poly(arylene sulfone)s with very high glass transition temperatures were synthesized from a series of new bisphthalazinone monomers. Bisphthalazinone monomers 7a − c and 8c were synthesized from 2-(4-chlorobenzoyl)benzoi…
This paper reviews recent investigations of the electronic structure and the optical properties of intercalated single-wall carbon nanotubes (SWCNTs) and C 60 filled SWCNTs (peapods) using electron energy-loss spectroscopy (EELS) in transmission as a probe. The results from these one-dimensional nanostructures are com…
Abstract The nonlinear conduction behavior of composite materials of foliated graphite nanosheets and nylon‐6 subjected to a variable direct‐current electric field has been studied. Corresponding to the onset of the nonlinearity, there is a crossover current density/electric field (or current–voltage) couple. The curr…
Temperature−composition values of liquid−solid equilibrium were measured calorimetrically and tabulated for 10 binary solutions of these 5 organic carbonates: ethylene carbonate, propylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate. Further, heat capacity ( C p ) and temperature ( T m…
Abstract We propose a new method for constructing kinetic response surfaces used in the development and optimization of gas‐phase and surface reaction kinetic models. The method, termed as the sensitivity analysis based (SAB) method, is based on a multivariate Taylor expansion of model response with respect to model p…
We analyze the static and dynamical properties of cooperative two-step spin-crossover solids adopting an Ising-like model where the states $+1$ and $\ensuremath{-}1$ represent the high-spin (HS) state and the low-spin (LS) state, respectively. The model consists of two equivalent sublattices with a ``ferro'' intrasubl…
This study determined the effect of water storage on flexural strength (FS) and compressive strength (CS) of 12 luting cements from different material classes. In addition, the influence of the curing method on the mechanical properties was investigated. The materials examined were two zinc phosphate cements (Harvard…