Materials Literature
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As the phase transformation temperatures influence the phase transformation behaviors of shape memory alloys, a constitutive model which can predict their phase transformation behaviors is necessary. In this study, a series of DSC tests is conducted to determine the phase transformation temperatures of shape memory al…
The drive towards ubiquitous electronics requires fundamental shifts in our approach to microelectronic fabrication as well as advances in materials and processing technologies. For large area electronics, low cost manufacturing, including roll-to-roll and printing technologies, will be required. These techniques pres…
Nonquasistatic effects in ac characteristics of carbon nanotube field-effect transistors are examined by solving a full time-dependent, open-boundary Schrödinger equation. The nonquasistatic characteristics, such as the finite channel charging time, and the dependence of small signal transconductance and gate capacita…
Attractive van der Waals--London dispersion interactions between two half crystals arise from local physical property gradients within the interface layer separating the crystals. Hamaker coefficients and London dispersion energies were quantitatively determined for $\ensuremath{\Sigma}5$ and near-$\ensuremath{\sum}13…
The authors report low-temperature preparation of Pb(Zr0.6,Ti0.4)O3 (PZT) thin films below 300°C using SrTiO3 seed layers on (111)Pt∕IrO2∕SiO2∕(001)Si substrates by metal-organic chemical vapor deposition. The critical parameters contributing low-temperature preparation for PZT were crystallinity and orientation of Sr…
The real part of the complex electric permittivity at low frequencies and at several biasing fields (between 0 and $5\ifmmode\times\else\texttimes\fi{}{10}^{5}\phantom{\rule{0.3em}{0ex}}\mathrm{V}∕\mathrm{m}$) has been measured in ferroelectric crystals ${[\mathrm{C}{\mathrm{H}}_{3}\mathrm{N}{\mathrm{H}}_{3}]}_{5}{\ma…
Oxidation of Cu3Au(100) using a hyperthermal O2 molecular beam (HOMB) was investigated by x-ray photoemission spectroscopy in conjunction with a synchrotron light source. From the incident energy dependence of the O-uptake curve, it was determined that the dissociative adsorption of O2 implies a higher activation barr…
Abstract Mono‐polyhedral oligomeric sillsesquioxane‐end capped poly(ε‐caprolactone) (mPPCL) can form inclusion complexes (ICs) with α‐ and γ‐cyclodextrins (CDs) but not with β‐CD. These CD ICs have been characterized with X‐ray diffraction, solid‐state 13 C cross‐polarization/magic‐angle‐spinning NMR spectroscopy, 1 H…
The authors report the fabrication of the nanopillars with single InGaAs∕GaAs quantum well by selective-area metal organic vapor phase epitaxy. The standard diameter deviation of the nanopillars is about 8% and the standard deviation in their height about 5%. Their photoluminescence peak positions shift to the longer…
The authors report depth-resolved optical properties of excitonic and phonon-assisted transitions in ZnO epilayers by photoluminescence (PL) and cathodoluminescence. A weaker free exciton (FX) emission than its first longitudinal optical phonon replica (FX-1LO) is observed at elevated temperatures (T>150K) for…
Room temperature Co K-edge extended x-ray absorption fine structure (EXAFS), x-ray absorption near edge structure (XANES) including pre-edge and x-ray diffraction (XRD) studies are carried out on LaCoO3 and PrCoO3. The Co-O, Co-La/Pr and Co-Co bond lengths are obtained from EXAFS analysis and compared with those obtai…
Abstract Summary: The structure of polymer brushes is investigated by dissipative particle dynamics (DPD) simulations that include explicit solvent particles. With an appropriate choice of the DPD interaction parameters $a_{ij}$ , we obtain good agreement with previous molecular dynamics (MD) results where the good so…
Network structures, such as polycrystals and dry foams, consist of space-filling, contiguous, irregular polyhedral grains or bubbles. The irregularity of such polyhedra derives from the fact that their curved faces are of mixed form, their edges are of varying length, and the positions of the vertices are non-symmetri…
Abstract The correlation between the surface tension parameters and the chemical composition of poly(ester urethane) and poly(ether urethane) thin films with different soft and hard segments, both before and after plasma treatment, was investigated. Calculations are based on the geometric mean approach of Owens and We…
Abstract We have demonstrated a simple method for depositing ZnO nanodots on quartz substrates by sparking off different tip shapes at voltages of 2, 4 and 6 kV in air at atmospheric pressure. A comparison was made among the three tip shapes: the sharp tip, the conical tip and the dull tip. The surface morphology was…
Ion-molecule reactions between complexes [La(CH3CN)n]3+ (n=6-9) or [La(NC(CH2)4CN)n]3+ (n=3-4) and water were studied at low collision energies in the second quadrupole of a tandem mass spectrometer. The products [La(CH3CN)p(H2O)8-p]3+ (p=6-8) and [La(NC(CH2)4CN)q(H2O)8-2q]3+ (q=3-4) had the highest relative abundance…
Ionic polymer gels have been known to change in volume due to external stimuli. Activated polyacrylonitrile (PAN) fibers are known to contract and elongate more than 100% in length when immersed in caustic and acidic solutions, respectively. Commercially available PAN fibers with diameters in the range of tens of micr…
The plane elasticity equations of two-dimensional quasicrystals of point group 10 are reduced to a single partial differential equation with eighth order by introducing a stress potential function. Further, we develop the complex variable function method for classical elasticity theory to that of the quasicrystals. Th…
The composition and temperature dependences of the thermal and electrical conductivities of three different Cd–Zn alloys have been investigated in the temperature range of 300–650 K. Thermal conductivities of the Cd–Zn alloys have been determined by using the radial heat flow method. It has been found that the thermal…
Resonance energy transfer from two-photon absorbing fluorene derivatives to the photochromic compound 3,4-bis-(2,4,5-trimethyl-thiophen-3-yl)furan-2,5-dione (PC 1) is investigated in hexane under one- and two-photon excitation. The quenching of the steady-state fluorescence of donor molecules in the presence of the di…