Materials Literature
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We show that the thermal stability of thin films of the organic semiconductor diindenoperylene (DIP) can be strongly enhanced by aluminum oxide capping layers. By thermal desorption spectroscopy and in-situ X-ray diffraction we demonstrate that organic films do not only stay on the substrate, but even remain crystalli…
A double-peaked structure was observed in the {\it in-situ} Brillouin Light Scattering (BLS) spectra of a 6 Å$ $ thick epitaxial Fe/GaAs(001) film for values of an external magnetic field $H$, applied along the hard in plane direction, lower than a critical value $H_c\simeq 0.9$ kOe. This experimental finding is theor…
Two-photon photoemission (2PP) spectra of $\mathrm{Ti}{\mathrm{O}}_{2}(110)$ surfaces are measured for the nearly perfect surface, and surfaces modified by introduction of defects and adsorbed molecules. Defects are generated on nearly perfect surfaces by three methods: electron irradiation, annealing in vacuum, and $…
Ce 1 - x Zr x O 2 ( x = 0−0.8) nanoparticulate powders were prepared via a mild urea hydrolysis based hydrothermal method through homogeneous nucleation at 413 K followed by calcination at 773 or 1173 K. X-ray fluorescence (XRF) and energy-dispersive X-ray analysis (EDAX) measurements testify to the good stoichiometri…
A small library of dendrimers was prepared from a common precursor that is available in 5 g scale in five linear steps at 56% overall yield. The precursor is a generation three dendrimer that displays 48 peripheral sites by incorporating AB4 surface groups. Manipulation of these sites provided six dendrimers that vary…
Surface roughness is known to amplify hydrophobicity. It is observed that, in general, two drop shapes are possible on a given rough surface. These two cases correspond to the Wenzel (liquid wets the grooves of the rough surface) and Cassie (the drop sits on top of the peaks of the rough surface) formulas. Depending o…
We report observations on a chiral nematic liquid crystal confined in a plane cell treated for homeotropic alignment. The characteristics of the specimen investigated are such that at room temperature a uniform homeotropic alignment is observed and at higher temperatures the material displays the helical structure. It…
The buckling behavior of TiNi Shape Memory Alloy (SMA) plates is evaluated numerically and experimentally with aim of using TiNi as an Energy Absorption (EA) material. To this end, we performed FEM analysis for TiNi plates of several thickness and length. The present analytical study shows promising result of using Ti…
Six series of laterally fluorinated liquid crystals containing 1,3,2-dioxaborinane and cyclohexyl units have been synthesized and characterized. Their mesomorphic properties were characterized by polarizing optical microscopy and differential scanning calorimetry. All these compounds are thermotropic liquid crystallin…
Abstract The texture of ordered phases of block copolymer melts and gels is highly sensitive to shear. In the body‐centered‐cubic phase of a block copolymer system [polystyrene–poly(ethylene butylene)–polystyrene] mixed with oil, we show how a given textures can be controlled with the application of a specific shear r…
The reaction of the trimetallic species [Fe(3)O(PhCOO)(6)(H(2)O)(3)]NO(3) with 1,1,1-tris(hydroxymethyl)ethane (H(3)thme) affords either the octametallic species [Fe(8)(PhCOO)(12)(thme)(4)] 1 or the hexadecametallic species [Fe(16)(EtO)(4)(PhCOO)(16)(Hthme)(12)](NO(3))(4) 2, depending on the nature of the solvent used…
The reversible dephosphorylation of beta-aspartyl phosphate to L-aspartate-beta-semialdehyde (ASA) in the aspartate biosynthetic pathway is catalyzed by aspartate-beta-semialdehyde dehydrogenase (ASADH). The product of this reaction is a key intermediate in the biosynthesis of diaminopimelic acid, an integral componen…
The present investigation is a part of a series on metal hydrides with extraordinary short $\mathrm{H}\mathrm{H}$ separations. The electronic structure, chemical bonding, and ground state properties of $RT\mathrm{In}$ $(R=\mathrm{La},\phantom{\rule{0.3em}{0ex}}\mathrm{Ce},\phantom{\rule{0.3em}{0ex}}\mathrm{Pr},\phant…
Magnetic order has been investigated in stripe-ordered ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{4}$ $(x=0.275,0.37,0.4)$ by dc magnetization and by polarized- and unpolarized-neutron diffraction. In the magnetically ordered phase, all three compositions exhibit a magnetic transition consistent…
Photoemission spectroscopy demonstrates the formation of a surface gold nitride upon irradiation of a $\mathrm{Au}(110)$ surface with $500\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ nitrogen ions at room temperature. After irradiation two $\mathrm{N}1s$ peaks are observed at binding energies of $396.7\ifmmode\pm\else\text…
catena-Poly[[aqualanthanum(III)]-μ-(8-carboxyoctanoato)-μ-octanedioato], [La(C8H12O4)(C8H13O4)(H2O)]n, is, to our knowledge, the first reported rare-earth complex containing a flexible long-chain ligand that crystallizes without water of crystallization. The layered polymeric structure is built from infinite chains…
This work illustrates the design, manufacturing and tensile testing of a novel concept of honeycomb structure made of shape memory alloy (SMA) core material. The honeycomb is manufactured using SMA Nitinol ribbons inserted in a special dye and using cyanoacrilate to bond the longitudinal strips of the unit cells. Anal…
Succeeding in getting a protein to crystallize is not always the final hurdle in the determination of its three-dimensional structure. A relatively frequent and particularly vexing situation is the production of macroscopically well formed crystals that exhibit no suitable diffraction pattern. In this paper, three ind…
The process by which spiders make their mechanically superior fiber involves removal of solvent (water) from a concentrated protein solution while the solution flows through a progressively narrowing spinning canal. Our aim was to determine a possible mechanism of spider water removal by using a computational model. T…
The effect of curling hair with a curling iron has been investigated. Possibilities of thermal damage with repeated curling according to, and in violation of, the manufacturer's specifications have been studied. The propensity of hair surface to damage depends on the moisture content of the hair, and these experiments…