Materials Literature
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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…
By measuring the strain across the premartensitic transition without and with external dc magnetic fields applied along the [001] and [010] directions of the parent phase, respectively, the characteristics of the premartensitic transition strain is investigated in detail. It was found that not only does the premartens…
Preparation of the conjugated polymer poly(1,4-phenylene vinylene) (PPV) inside the channels of the mesoporous silica MCM-41 is described. Polymerization was initiated inside the channels by deprotonated surface hydroxy groups. Presence of PPV was observed by infrared, absorption, and luminescence spectroscopy. A pore…
The neglect of excluded volume interaction in light scattering from randomly branched macromolecules leads to misinterpretation of the angular dependence. With a space correlation function of general fractal behavior γ( r ) = Ae -( r /ξ )/( r /ξ) 3- d Feltoft et al. ( Phys. Rev. B 1986, 33, 269) derived the correspond…
The Lewis structures that contribute to the imidazolium protonated cation resonance hybrid can be explained in a unified way in terms of the Fukui function (density functional descriptor) and the local hard and soft acids and bases principle. The results obtained open the possibility of analyzing the resonance contrib…
In this article, we present results of the RAPET dissociation of MoO(OMe)4 at 700 degrees C in a closed Swagelok cell. The reaction produces molybdenum dioxide nanoparticles (20 nm) coated with carbon (20 nm). We have also carried out the same reaction under an applied magnetic field of 10 T. This reaction yielded dif…
The conformational dynamics of poly(acrylic acid) induced by pH change is reported here. Poly(acrylic acid) immobilized on gold surface was exposed to pH changes, and the conformational changes thus induced were followed in real time using surface plasmon resonance spectroscopy. The temporal profile of the stretching-…
We report on the structural, magnetic and magnetotransport effects promoted by Nd 3+ substitution in Nd x Sr 2− x FeMoO 6 . In spite of the fact that the ionic radius of Nd 3+ is smaller than that of Sr 2+ , the unit cell volume remains constant across the series. We also show that the incorporation of Nd 3+ induces a…