Materials Literature
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A microcapillary flow reactor has been used to prepare a size series of colloidal CdSe nanocrystals (NCs). The continuous‐flow method (see Figure for schematic) produces samples with size distributions and quantum yields comparable to those prepared in conventional batch processes. The results obtained from the reacto…
Compounds based on the 4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (BODIPY) framework are excellent fluorescent markers. When BODIPY dyes of this type are conjugated to functionalities that absorb at relatively short wavelengths, those functionalities can, in some molecules, transmit the absorbed en…
Amphiphilic block copolymers in solution spontaneously self-assemble when the solvent quality for one block is selectively decreased. We demonstrate that, for supersaturation ratio changes [d(S)/dt] over 10(5) per second from equilibrium, nanoparticles are obtained with a formation mechanism and size dependent on the…
Femtosecond time-resolved transient absorption studies have been performed to investigate the photoinduced energy and electron-transfer processes in Zn(II)porphyrin-Zn(II)chlorin-fullerene triad in which energy and oxidation potential gradients are directed along the donor-acceptor-linked arrays. Fast energy transfer…
Rietveld analyses performed on high-temperature X-ray (HTXRD) and neutron (HTND) powder patterns of β-(Zr 2 O)(PO 4 ) 2 have allowed us to follow accurately the thermal variations of the cell parameters and to explain its strong dilatometric anisotropy in terms of structural distortions. It appeared that the anomaly r…
We have studied the storage and long-range transport of electrons in a porous assembly of weakly coupled ZnO quantum dots permeated with an aqueous and a propylene carbonate electrolyte solution. The number of electrons per ZnO quantum dot is controlled by the electrochemical potential of the assembly; the charge of t…
The present work presents LO and TO functions in the mid-infrared region for thin films deposited from glow discharge plasmas of tetramethylsilane (TMS) diluted either in Ar or O 2 or in mixtures of these two gases. These functions were calculated through the Kramers−Krönig analysis of transmittance spectra of the fil…
A new series of phthalocyanine-containing biodegradable poly(ε-caprolactone)s have been synthesized by ring-opening polymerization of ε-caprolactone and/or 5-ethylene ketal ε-caprolactone using silicon phthalocyanine dihydroxide as the initiator and tin(II) 2-ethylhexanoate as the catalyst. The polymers have been spec…
Abstract The imaging of the near field by a slab of negative permittivity medium is discussed. The performance of this flat lens is limited by the working wavenumber k 0 and the slab thickness d . For k 0 d ≪ 0.937, the resolution of the flat lens can be smaller than the wavelength and depends logarithmically on 1/ k…
Plasma treatment of contaminated water appears to be a promising alternative for the oxidation of aqueous organic pollutants. This study examines the kinetic and oxidation mechanisms of methyl tert-butyl ether (MTBE) in a dense medium plasma (DMP) reactor utilizing gas chromatography-mass spectrometry and gas chromato…
We present what is to our knowledge a new type of diffractive optical element (DOE), the computer-generated stratified diffractive optical element (SDOE), a hybridization of thin computer-generated DOEs and volume holograms. A model and several algorithms for calculating computer-generated SDOEs are given. Simulations…
The morphological evolution of zinc oxide (ZnO) thin films deposited by magnetron sputtering is described by the use of a Structure Zone Model. A modified Structure Zone Model was revealed, in which the boundaries between zones with specific features are shifted toward lower homologous temperatures ( T / T m ) than in…
Experimental and theoretical study of nuclear magnetic resonance (NMR) spectra of dinuclear complexes of paramagnetic trivalent Tb, Dy, Ho, Er, Tm, or Yb ions with phthalocyanine ligands is presented. The 1 H NMR paramagnetic shifts of the dinuclear Pc triple-decker complexes PcLnPcLnPc* (abbreviated as [Ln, Ln]; Pc i…
The morphological evolution of ZnO thin films deposited by magnetron sputtering has been investigated on two types of substrates, (111) textured Pt and (100) Si possessing a native oxide. The ZnO films are oriented with the c- axis [0001] normal to the substrate and possess varying degrees of crystallinity. The films…
Unequal brothers: Benzoperylene carboxylic acid derivatives with flexible chains not only form charge-transporting columnar liquid crystals (see graphic), their charge-transport properties can also be tuned to be either of n- or of p-type: relatively minor changes in the substitution pattern yield different materials…
We review our recent work in the field of molecular spin clusters and single-molecule magnets, showing how inelastic neutron scattering (INS) can be used to determine magnetic exchange interactions and anisotropy splittings. A general introduction to neutron scattering precedes selected examples, building upon the fir…
Surveys of crystal form diversity of two test compounds, 1 (an experimental angiotensin II antagonist) and 2 (sertraline HCl, the active drug in Zoloft), have been performed with high-throughput (HT) crystallization. Compound 1 was found to have at least 18 crystal forms based on a HT recrystallization experiment usin…
Zircon has been proposed as a nuclear waste form to safely encapsulate weapons-grade plutonium. In order to study the impact of self-irradiation damage in zircon on its aqueous durability, we performed a hydrothermal experiment (2 M CaCl 2 solution, 600 °C, 100 MPa) with several variably radiation-damaged, i.e. amorph…
Chorismate mutase provides an important test of theories of enzyme catalysis, and of modelling methods. The Claisen rearrangement of chorismate to prephenate in the enzyme has been modelled here by a combined quantum mechanics/molecular mechanics (QM/MM) method. Several pathways have been calculated. The sensitivity o…
In this work, we describe a simple inorganic route for synthesis of monodispersed W(18)O(49) nanorods with dimensional control in the quantum confinement regime. The single-crystalline W(18)O(49) nanorods can be prepared into stable colloidal solutions, or assembled into fibrous and/or paper forms by tuning process pa…