Materials Literature
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Silicon nanocrystals (Si-nc) and amorphous silicon (α-Si) produced by silicon implantation in fused silica have been studied by micro-Raman spectroscopy. Information regarding the Raman signature of the α-Si phonon excitation was extracted from Raman depth-probing measurements using the phenomenological phonon confine…
The fabrication of gold Fresnel zone plates, by a combination of e-beam lithography and electrodeposition, with a 30 nm outermost zone width and a 450 nm-thick structure is described. The e-beam lithography process was implemented with a careful evaluation of applied dosage, tests of different bake-out temperatures an…
Recombination dynamics in CdTe/CdSe core-shell type-II quantum dots (QDs) has been investigated by time-resolved photoluminescence (PL) spectroscopy. A very long PL decay time of several hundred nanoseconds has been found at low temperature, which can be rationalized by the spatially separated electrons and holes occu…
Katalysator mit Kupferkopf: Ein monomeres γ-Keggin-Silicowolframat mit Bis-μ-1,1-azidodikupfer-Einheit katalysiert die selektive oxidative Homokupplung von aromatischen und aliphatischen Alkinen zu den entsprechenden Diinen (siehe Bild).
Multiporphyrin-modified CdSe nanoparticles (CdSe-H2P) were prepared to elucidate the interaction between chromophores and luminescent semiconducting nanoparticles in the excited and ground states. The CdSe-H2P nanoparticles were obtained by place-exchange reactions of hexadecylamine-thiophenol-modified CdSe nanopartic…
The solubilities of imidacloprid in water, methanol, ethanol, acetone, 2-butanone, dichloromethane, 1,2-dichloroethane, and trichloromethane were measured at temperatures from (293.15 to 353.15) K by a synthetic method at atmospheric pressure. The solubilities were correlated by the λh model, in which new parameters w…
We investigated the growth mechanism of layered single-walled carbon nanotube (SWNT) mats by a cutting method. Transmission electron microscope observations revealed that new SWNTs grown below first grown SWNTs also have caps at their tips. Raman spectroscopy suggests that the SWNTs in each layer have the same chirali…
Onion-like carbons (OLC) obtained by thermal transformation of nanodiamonds are agglomerates of multi-shell fullerenes, often covered by an external graphitic mantle. For the present work, elemental OLC units were constructed on the computer by coalescence of several two-layer fullerenes, in a structure similar to car…
Nanoporous anodic alumina films on Al substrates have been used as templates for the growth of electrodeposited Ni nanowires. The nanowire diameter ranges between 35 and 65nm, and the hexagonal symmetry lattice constant is 105nm. The magnetization curves for these nanowire arrays with and without the Al substrate have…
The $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ emission spectrum and absorption spectrum between 27 000 and $30\phantom{\rule{0.2em}{0ex}}000\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ have been recorded and assigned for $\mathrm{Sr}{\mathrm{Cl}}_{2}:{\mathrm{Yb}}^{2+}$ (0.05 and $1\phantom{\rule{0.3em}…
A prominent failure mechanism of small diameter expanded polytetrafluoroethylene (ePTFE) vascular grafts is platelet-mediated thrombosis. We have designed a surface modification for ePTFE consisting of a self-assembling fluorosurfactant polymer (FSP) bearing biologically active ligands, including adhesive peptides and…
The novel hydrogensquarate salt of 4-cyanopyridine was synthesized, and its structure and properties were elucidated in detail spectroscopically, thermally, and structurally, using single-crystal X-ray diffraction, linear-polarized solid-state IR spectroscopy, UV spectroscopy, TGA, DSC, DTA, and positive and negative…
Single walled nanotubes are difficult to disperse in solvents, with dispersion quality limited by nanotube bundling at high concentration. We quantitatively study dispersions of singlewall nanotubes, functionalized with the bulky molecules PABS, PEG, and ODA, in common solvents. TGA measurements coupled with AFM analy…
We report on the temperature dependence of the nanosecond-timescale dynamics of the ternary mixture water/AOT/oil with deuterated heptane, toluene or decane as the oil. Water-swollen reverse micelles as formed in such microemulsions allow us to investigate the freezing behaviour of water confined in a soft environment…
The rationale and strategy for purification of partially resolved enantiomeric mixtures based on ternary phase diagrams are discussed. From the ternary phase diagram, one can deduce if a feasible process can be developed to upgrade the enantiomeric excess (ee) of a partially resolved enantiomeric mixture. When such a…
A biomorphic α‐MoO 3 ceramic was successfully derived from paper templates. By the infiltration of a Mo‐contained solution into paper templates, followed by calcinations at 500°C in air, the cellulose fibers of paper were converted into branches composing of orthorhombic α‐MoO 3 crystals with grain size ranging from 0…
Abstract This paper describes the development of a numerical procedure for predicting deformations and stresses in a loaded two‐dimensional membrane exhibiting micropolar or Cosserat constitutive behaviour. The procedure employs a conventional finite element (FE) mesh together with a dual mesh of interconnected contro…
The reactivity, or rate of consumption, of magnesium oxide (MgO) powder used in forming magnesium oxychloride (MOC) cement is largely affected by its thermal history and particle size. That, in turn, influences both reaction rate and properties of the reaction products of MOC cement. It is believed that the traditiona…
The group velocities of longitudinal and flexural wave propagations in single- and multi-walled carbon nanotubes are studied in the frame of continuum mechanics. The dispersion relations between the group velocity and the wavenumber for flexural and longitudinal waves, described by a beam model and a cylindrical shell…
The absence of a Mn local moment was observed in Mn-doped amorphous silicon $(a\text{\ensuremath{-}}{\mathrm{Mn}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x})$ films. The magnetic susceptibility obeys the Curie-Weiss law for a wide range of $x$ ($5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ up to 0.175) but with…