Materials Literature
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A slab of negatively refracting material, thickness d , can focus an image at a distance 2 d from the object. The negative slab cancels an equal thickness of positive space. This result is a special case of a much wider class of focusing: any medium can be optically cancelled by an equal thickness of material construc…
Oxide-diluted magnetic semiconductors (O-DMS) have attracted a great deal of interest in recent years due to the possibility of inducing room temperature ferromagnetism. These materials are of particular interest for spintronic devices such as spin valves. This review describes the experimental status of the O-DMS inc…
Polarized micro-Raman measurements were performed to study the phonon modes of Fe, Sb, Al, Ga, and Li doped ZnO thin films, grown by pulsed-laser deposition on c-plane sapphire substrates. Additional modes at about 277, 511, 583, and 644 cm−1, recently assigned to N incorporation [A. Kaschner et al., Appl. Phys. Lett.…
We have measured the rate coefficients for the removal of OH( v = 1) and OD( v = 1) by HNO 3 and DNO 3 as a function of temperature from 253 to 383 K. OH( v = 1) and OD( v = 1) were produced by photolysis of HNO 3 /DNO 3 at 248 nm; laser-induced fluorescence was used to monitor the kinetics of the vibrationally excite…
Hot wire chemical vapor deposition (HWCVD) has been adapted to be a continuous growth process for high-density carbon multiwall nanotubes (MWNTs). MWNT growth is optimized in 1:5 CH 4:Ar at 150 Torr with reactor temperatures of 400 and 550 °C for static and flowing gases, respectively. Ferrocene is employed to provide…
In this study, transmission FT-IR spectroscopy is used to investigate the role of water in nitric acid uptake on MgO(100) and water uptake on nitric acid reacted MgO(100) at 296 K. Under dry conditions, nitric acid uptake is limited to the topmost surface layer and saturates at a nitrate coverage of (2.3 ± 0.1) × 10 1…
This paper reports an investigation of the abatement of polycyclic aromatic hydrocarbon (PAH) emissions using different carbonaceous materials as adsorbents. PAH model compounds (naphthalene and phenanthrene) were initially used to obtain a deeper understanding of the complex process of PAH adsorption in industrial ho…
The luminescence properties of thiocyanate and selenocyanate platinum(II) and palladium(II) complexes show strong variations with temperature and pressure. The d-d luminescence band maxima for [Pt(SCN)(4)](PPh(4))(2) (1), [Pt(SCN)(4)](n-Bu(4)N)(2) (2), and [Pt(SeCN)(4)](n-Bu(4)N)(2) (4) complexes are centered at ca. 1…
Ab initio molecular dynamics simulations on 1-nm thick slabs of amorphous silica have been carried out in order to mimic the local properties of mesoporous materials framework. A number of defects have been considered, both with closed and open shell electronic structure, and their spectroscopic properties analyzed an…
We have performed experiments on model emulsions of polyisobutylene (PIB) and poly(dimethylsiloxane) (PDMS) to quantify the effect of confinement on deformation and stability under flow of droplets and strings (threads). It is known from earlier work from our group that, under confinement, droplets in concentrated emu…
The near-infrared to visible upconversion properties of nanocrystalline Gd 3 Ga 5 O 12:Er 3+ (1 and 5%) were studied following excitation of the 4 I 9/2 exited state with 800 nm radiation. Intense green and red emissions were observed from the ( 2 H 11/2, 4 S 3/2 ) → 4 I 15/2 and 4 F 9/2 → 4 I 15/2 transitions, respec…
[reaction: see text] Polyfluorinated quaternary ammonium cations, [CF(3)(CF(2))(7)(CH(2))(3)](3)CH(3)N(+) (R(F)N(+)), were synthesized and used as countercations for the [WZnM(2)(H(2)O)(2)(ZnW(9)O(34))(2)](12)(-) (M = Mn(II), Zn(II)) polyoxometalate. The (R(F)N(+))(12)[WZnM(2)(H(2)O)(2)(ZnW(9)O(34))(2)] compounds were…
Laser-induced precipitation and crystal growth were observed by an irradiation of benzophenone in an ethanol and water mixed solvent. The crystal was composed of benzopinacol produced from excited benzophenone through a benzophenone ketyl radical. Polyhedral, skeletal, and dendrite morphologies of benzopinacol were co…
We report the ring-opening polymerization (ROP) of ε-caprolactone catalyzed by Al(Et) 3 and Al[OCH(CH 3 ) 2 ] 3 from lightly cross-linked poly(DVB80- co -HEMA) microspheres. The resulting poly(ε-caprolactone) grafted particles with active propagating ends were converted to macroinitiators for ATRP and used further to…
The stepwise course of the synthesis of homo- (4f, 4f) and heterodilanthanide (4f, 4f ') complexes has been investigated through structural determination of the intermediate and final products occurring in the process. In the first step, the tripodal ligand H(3)L is reacted with Ln(NO(3))(3) x 5H(2)O to give a complex…
Diblock copolymers of poly( N -isopropylacrylamide- co - N -(2-hydroxypropyl)methacrylamide lactate) (poly(NIPAAm- co -HPMAm-lactate)) as a thermosensitive block and poly(ethylene glycol) (PEG) as a hydrophilic block form polymeric micelles above the cloud point (CP) of the temperature-sensitive block. Destabilization…
The square-planar structure of a diamagnetic Cu(III) complex of tetrakis(pentafluorophenyl)-substituted N-confused porphyrin was elucidated by X-ray diffraction analysis. The facile interconversion between Cu(II) (1) and Cu(III) (2) complexes was achieved by chemical oxidation/reduction, and the Cu(III)/Cu(II) redox p…
The onset and kinetics of martensitic transformations are controlled by impurities trapped during the transformation. For the alpha to omega transformation in Ti, ab initio methods yield the changes in both the relative stability of and energy barrier between the phases. Using the recently discovered transformation pa…
A variety of porphyrin arrays connected by diverse linkers have been envisaged and prepared for the applications in molecular photonics and electronics. From a viewpoint of operational requirements, the porphyrin arrays should have the very regular pigment arrangements which allow a facile light energy or charge flow…
We demonstrate that highly crystalline, monodisperse maghemite (γ-Fe 2 O 3 ) nanoparticles, synthesized in organic solvents, can be effectively transferred into an aqueous medium using an ammonium salt and stabilized at neutral pH. The nanoparticles remain monodisperse, as characterized by TEM and XRD, as well as supe…