Materials Literature
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For the single-molecule magnet ${\mathrm{Mn}}_{12},$ Cornia et al. recently proposed that solvent molecules may cause the quantum tunneling that requires a lower symmetry than ${S}_{4}.$ However, magnetic quantum tunneling and electron-paramagnetic-resonance experiments suggested that the proposed theory may not corre…
Nuclear Magnetic Resonance studies of Ga stabilized delta-Pu reveal detailed information about the local distortions surrounding the Ga impurities as well as provides information about the local spin fluctuations experienced by the Ga nuclei. The Ga NMR spectrum is inhomogeneously broadened by a distribution of local…
We present the temperature dependence of the specific heat, without external magnetic field and with H= 9 T, for LaMnO3, La1.35Sr1.65Mn2O7, La1.5Sr0.5NiO4 and La1.5Sr0.5CoO4 single crystals. We found that spin-wave excitations in the ferromagnetic and bilayer-structure La1.35Sr1.65Mn2O7 were suppressed by the 9 T magn…
A spin decoherence mechanism is proposed for localized electrons. The irregular phonon phase disturbances originated from phonon relaxation can influence electron spin precession with a net effect of spin phase decay. A quantitative analysis demonstrates relatively high efficiency of this mechanism in the low temperat…
The characteristics of device structures that employ phosphorus-doped (Zn,Mg)O have been examined in a effort to delineate the carrier type behavior in this material. The capacitance–voltage properties of metal/insulator/P-doped (Zn,Mg)O diode structures were measured and found to exhibit a polarity consistent with th…
A full dislocation often dissociates into two partial dislocations enclosing a stacking fault (SF) ribbon. The SF width significantly affects the mechanical behavior of metals. Al has very high stacking fault energy and, consequently, very narrow SF width in its coarse-grained state. We have found that some SFs in nan…
ZnO nanoneedles were prepared on a silicon wafer through a chemical vapor deposition. The diameters of the needle tips were in a range of 20–50 nm. High-resolution transmission electron microscopy revealed that the nanoneedles were single crystals growing along the [001] direction and exhibiting multiple tip surface p…
Highly protein-resistant, self-assembled monolayers (SAMs) of dendritic polyglycerols (PGs) on gold can easily be obtained by simple chemical modification of these readily available polymers with a surface-active disulfide linker group. Several disulfide-functionalized PGs were synthesized by N,N'-dicyclohexylcarbodii…
The proton exchange processes between water and solutes containing exchangeable protons have recently become of interest for monitoring pH effects, detecting cellular mobile proteins and peptides, and enhancing the detection sensitivity of various low-concentration endogenous and exogenous species. In this work, the a…
A review is given of recent results in developing improved fabrication processes for ZnO devices with the possible application to UV light emitters, spin functional devices, gas sensors, transparent electronics, and surface acoustic wave devices. There is also interest in integrating ZnO with other wide band-gap semic…
We report on ground state laser cooling of single 111Cd+ ions confined in radio-frequency (Paul) traps. Heating rates of trapped ion motion are measured for two different trapping geometries and electrode materials, where no effort was made to shield the electrodes from the atomic Cd source. The low measured heating r…
Using different isotopologues of the reactant gases CO and O 2, infrared reflection absorption spectroscopy (IRAS) has been used to investigate the transient surface species on the Pt{100} surface under reaction conditions which was first shown to give rise to an absorption band around 1630 cm -1 by Hong and Richardso…
A novel layered manganese(II) phosphate, Mn 3 (PO 4 ) 4 ·2(H 3 NCH 2 CH 2 ) 3 N·6(H 2 O), has been synthesized solvothermally using tris(2-aminoethyl)amine (TREN) as a template. The structure was solved ab initio using X-ray powder diffraction data and confirmed by molecular modeling. The compound was further characte…
We investigate the long-distance propagation of broadband photoluminescence (PL) light inside an annealed Si/SiO 2 superlattice (SL) with repeats of 1.5 nm Si and 2 nm SiO 2 layers deposited on a silica substrate. The SL material annealed at 1150 °C contains Si nanocrystals with diameters of 3–4 nm as estimated by Ram…
In this paper, the finite difference time domain (FDTD) method is used to simulate light propagating from a vacuum to a glass covered with a nano-porous film. By comparing the transmission ratio spectrum given from the model with the theoretical transmission ratio spectrum, the effective refractive index of the nano-p…
We perform angle-resolved photoemission spectroscopy on 1 T -TaS 2 and 1 T -TaSe 2 using synchrotron radiation. We observe a characteristic splitting of the chalcogen p-derived valence bands along high symmetry directions. Density functional theory calculation and group theory strongly suggest that this splitting is d…
The dual-jet slot die is the most common device used for producing melt-blown fibers. In this die, high-velocity air impinges upon a polymer stream. A comprehensive model was applied to predict the performance of these slot dies. This model involves the simultaneous solution of the momentum, energy, and continuity equ…
Silica gels dispersed with nanoscale CdS particles were prepared by the sol–gel process combined with γ-irradiation at room temperature and in ambient pressure. X-ray diffraction (XRD) and transmission electron microscopy have revealed the existence of CdS nanocrystals, as well as their structures and size distributio…
Solid-state reactions between metal sulfates and metal oxides (assisted by K 2 CO 3 ) have been used to prepare two classes of important perovskite materials: ferroelectric PbTiO 3 and the catalyst/magnetic/fuel-cell material La 1 - x Sr x MnO 3 ( x = 0.0 and 0.3). K 2 CO 3 helps to drive the reaction by forming highl…
Dissimilar coiled carbon nanotubes were prepared by catalytic chemical vapor deposition (CCVD) on finely divided Co nanoparticles supported on silica gel under reduced pressure and at lower gas flow rates. The morphology of the regular coiled carbon nanotubes were examined by TEM, while the polygonization characterist…