Materials Literature
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We present a combined theoretical and experimental study of the ferromagnetic semiconductor (Ga,Mn)As which explains the remarkably large changes observed on low-temperature annealing. Careful control of the annealing conditions allows us to obtain samples with ferromagnetic transition temperatures up to 159 K. Ab ini…
Colloidal semiconductor quantum dots are attractive fluorophores for multicolor imaging because of broad absorption and narrow emission spectra, and they are brighter and far more photostable than organic dyes. However, severe intermittence in emission (also known as blinking) has been universally observed from single…
Using the achiral diazine ligands bearing two bidentate pyridylimino groups as sources of conformational chirality, five azido-bridged coordination polymers are prepared and characterized crystallographically and magnetically. The chirality of the molecular units is induced by the coordination of the diazine ligands i…
With trimming of the diameter of the well-ordered polystyrene arrays using oxygen plasma treatment and modification of these surfaces with gold and alkylthiols, the water contact angles on these surfaces can be systematically tuned from 132° to 170°.
Motivated by the periodic ripples observed in bent multi-walled nanotubes, we use macroscopic ideas to derive geometric scaling laws for the wavelength and amplitude of ripples in elastic scrolls and multi-walled tubes. Remarkably, our predictions are essentially independent of material properties, and thus have a ran…
Abstract The successful design of photochromic self‐assembly systems requires understanding (on both the molecular and sub‐molecular scales) of diverse and often competing structure‐property relationships. Such molecular systems are promising as components for photonically switchable components in opto‐electronic devi…
Abstract The preparation of new octakis[ m‐ (trifluoromethyl)phenyl]‐ and octakis[ m ‐(trifluoromethyl)phenoxy]phthalocyanines ( 6a and 6b ) and their complexes with magnesium ( 5a , 5b ) and indium ( 7a , 7b ) is described. Their spectroscopic properties and solubilities are discussed in relation to those of metal‐fr…
Reversible growth: Microcapsules were fabricated by layer-by-layer assembly of poly(diallyldimethyl ammonium chloride)/poly(styrene sulfonate) onto removable melamine formaldehyde particles. The capsules with swelling and shrinking features (see graphic) provide a novel route for microencapsulation. Loading of biomacr…
We present an X-ray diffraction study of the normal alkane nonadecane C 19 H 40 embedded in nanoporous Vycor glass. The confined molecular crystal accomplishes a close-packed structure by alignment of the rod-like molecules parallel to the pore axis while sacrificing one basic ordering principle known from the bulk st…
Predicting transition temperatures: The transition temperature, the key quantity for liquid crystals, has until now never been accurately predicted by computer simulation. The authors describe accurate predictions (within 15 K) of the nematic–isotropic transition temperature for a liquid crystal, starting from just th…
General energy approaches have been applied to study the single-domain polarization reversal induced by the voltage-modulated Atomic Force Microscopy (AFM) in ferroelectric single crystals and thin films. Topographic analysis of energy surfaces in the subspace of domain dimensions is performed, and energy evolutions u…
Using a band-structure method that includes the correction to the band gap error in the local density approximation (LDA), we study the chemical trends of the band gap variation in III-V semiconductors and predict that the band gap for InN is 0.8 +/- 0.1 eV, which is much smaller than previous experimental value of ap…
Spherical silver and gold nanoparticles with narrow size distributions were conveniently synthesized in aqueous solution by a novel electrochemical method. The technological keys to the electrochemical synthesis of monodispersed metallic nanoparticles lie in the choice of an ideal stabilizer for the metallic nanoclust…
I report that thermal single-barrier (TSB) and thermal double-barrier (TDB) structures (formed, for example, by inserting one or two regions of a few Ge monolayers in Si) provide both a suppression of the phonon transport as well as a resonant-thermal-transport effect. I show that high-frequency phonons can experience…
A new indium holmium digermanate, In(1.06)Ho(0.94)Ge(2)O(7), with a thortveitite-type structure, has been prepared as a polycrystalline powder material by high-temperature solid-state reaction. This new compound crystallizes in the monoclinic system (space group C2/c, No. 15). The structure was characterized by Rietve…
Crystals of calcium potassium cyclo-triphosphate, CaKP3O9, have been synthesized from a melt and structurally characterized using single-crystal X-ray diffraction. The compound is isostructural with the mineral benitoite (BaTiSi3O9).
β-Ga 2 O 3 nanowires have been synthesized at a low temperature of 550 °C using a single precursor of gallium acetylacetonate through the vapor−liquid−solid (VLS) mechanism. Synthesis of very thin β-Ga 2 O 3 nanowires with an average diameter of 8 nm was achieved using this method. The influences of substrate temperat…
The program TWINLAW reads two orientation matrices obtained from a non-merohedrally twinned crystal and evaluates the twin law. In a second step, the program HKLF 5 uses this twin law to generate a reflection file for refinement with the HKLF5 option of the SHELXL program. The use of both programs is demonstrated by m…
A detailed phase diagram of Pb(Mg 1/3 Nb 2/3 ) (1− x ) Ti x O 3 , conventionally abbreviated to PMN-PT, has been constructed around the morphotropic phase boundary from measurements taken from one single crystal possessing a composition gradient. Optical birefringence imaging was employed as a function of temperature…
Hen egg-white lysozyme (HEWL) crystals have been studied by means of double-crystal synchrotron topography. The crystals reveal a number of features that are quite well known in hydrothermally grown inorganic crystals: dislocations, growth bands and growth sector boundaries. Dislocations in the 〈110〉 sectors have been…