Materials Literature
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Analysis of expressed sequence tags (ESTs) was performed to gain insights into cold adaptation in the polar diatom Fragilariopsis cylindrus Grunow. The EST library was generated from RNA isolated 5 days after F. cylindrus cells were shifted from approximately +5° C to −1.8°C. A total of 1376 ESTs were sequenced from a…
The pi-cell is studied as a function of its pretilt angle. It is shown experimentally and theoretically that the critical holding voltage decreases as the pretilt angle increases. At high pretilt angles, the critical holding voltage becomes zero and the bend cell becomes stable. The measured total response time of the…
Einblick in supramolekulare Objekte: Mit optischen Methoden und konfokaler Rastermikroskopie wurde der intermolekulare Energietransfer (ENT) in gemischten Vesikeln aus Donor/Acceptor-Oligo(p-phenylenvinylenen) (OPVs) in Wasser verfolgt (siehe Bild). Diese Beobachtung des Austauschprozesses zwischen getrennten Donor- u…
Recent phylogenetic studies of the diatoms indicate that members of the order Thalassiosirales occupy an interesting position in the diatom evolutionary tree. Despite their radial morphology and scaly auxospores, they are consistently recovered in molecular analyses as a member of subdivision Bacillariophytina and a s…
Isothermal crystallization of three-dimensional (3D) spherulites from the bulky melt under low shear rate flow was studied based on new in situ observation along a direction perpendicular to the flow velocity gradient plane ( XZ plane) by means of optical microscope, where X - and Z -axes are perpendicular and paralle…
The adsorption rate of methyl red dyes on a polymer surface is studied and determined to be much faster than that on indium-tin-oxide-coated glass. Therefore, an optically switchable twist-nematic grating is fabricated using a dye-doped liquid crystal cell, with a glass substrate coated with a polymer relief grating.
Abstract Boron‐containing novolac resins were synthesized by the modification of a commercial novolac resin with different contents of bis(benzo‐1,3,2‐dioxaborolanyl)oxide. These novolac resins were crosslinked with diglycidyl ether of bisphenol A (DGEBA), and their thermal, thermodynamomechanical, and flame‐retardant…
A skyrmion model of nano-domain ejection from large domain walls in ferroelectrics is presented, together with data on lead germanate Pb 5 Ge 3 O 11 and comparison data on ferromagnetic iron garnet. Notable is the occurrence of a short-wavelength transverse wall instability (wiggles) prior to the nano-domain emission.…
A ternary sulfide exists on the quasi-binary section La 2 S 3 −Sb 2 S 3, La 7+ δ Sb 9 - δ S 24 . This material exhibits a small but significant phase range with at least −0.296(4) ≤ δ ≤ 0.134(6). La 7+ δ Sb 9 - δ S 24 forms a new structure type, space group P 2 1 / c, with a = 8.7115(9) Å, b = 14.3450(15) Å, c = 15.26…
N-(2-Mercaptopropionyl)glycine (tiopronin)-coated silver nanoparticles (average diameter of metal core=5 nm) were prepared by a modified Brust method. Tiopronin ligands were partially displaced by thiolate single-stranded oligonucleotides via ligand exchange. These particles were immobilized onto a solid substrate thr…
Abstract The Thermoluminescence (TL), Blue Stimulated Luminescence (BSL) and Infrared Stimulated Luminescence (IRSL) properties of apatite (originating from Durango, Mexico) are studied. The TL dose response of Durango apatite is linear to an extended dose region whereas the BSL and IRSL dose responses are sublinear.…
We discuss theoretically a novel approach to tailoring the properties of a new family of organic-inorganic hybrid superlattices, using two isostructural materials, ZnSe(en)0.5 and ZnTe(en)0.5, as examples. Replacing Se with Te leads to a number of nontrivial changes: the conduction band parity, singularity type, condu…
Licht bewegt: Die Herstellung flüssigkristalliner Azobenzolelastomerfilme mit vollkommen verschiedener Anordnung der Mesogene durch In-situ-Photopolymerisation wird beschrieben. Bei der Bestrahlung mit UV-Licht biegt sich der Film mit homogener (paralleler) Ausrichtung in Richtung der Lichtquelle, der mit homöotroper…
A strain-dependent random landscape model shows that many aspects of the mechanical response of disordered materials are universal, and arise from the rugged nature of the energy landscape. Simulations with this model demonstrate that states produced by mechanical deformation will generally be distinct from the states…
Swapping structures and cations: In an acid-induced 3D-to-3D transformation at room temperature, K6Cd4Sn3Se13 is converted into K14−xHxCd15Sn12Se46. The [Cd15Sn12Se46]14− framework, which contains a tunnel network of accessible cages of labyrinthine complexity (see picture), is highly robust, acid resistant, and has e…
Polymers adsorbing from a dilute solution onto the solvent-vapor interface generate a nonzero surface pressure. When the same polymers are end-grafted onto a surface such that a so-called polymer brush is formed, one will find that the solvent wets this compound interface partially. The partial wetting and the finite…
Gd + ions were implanted at total doses of 3–6×1014cm2 into single-crystal GaN or AlN epilayers grown on sapphire substrates and annealed at 700–1000°C. The implanted Gd showed no detectable diffusion in either material after annealing, as measured by secondary ion mass spectrometry, corresponding to a diffusion coeff…
Diffusion barrier properties of 10nm Ru sputtered in N and Ar atmospheres have been assessed. N was found to be dissolved in the Ru film deposited in N atmosphere making it amorphous with ten times higher sheet resistance. Annealing caused effusion of N resulting in crystallization of Ru and a sharp decrease in sheet…
Im Roten: Die Synthese und die optischen Eigenschaften homologer, im Nah-IR absorbierender Chromophore vom Leitertyp werden vorgestellt: von zwei Pentarylenbis(dicarboximiden) (grüne Spektren; siehe Bild) und einem Hexarylenbis(dicarboximid) (gelbes Spektrum). Wie die übrigen Spektren belegen, führt eine zunehmende An…
Abstract Hydrotalcites with phosphate in the interlayer were prepared at different pH values. At pH > 11.0 (PO 4 ) 3− was the intercalated ionic species, whereas at pH < 11.0 a mixture of (PO 4 ) 3− and (HPO 4 ) 2− ions was intercalated. Powder X‐ray diffraction shows that the hydrotalcite formed at pH 9.5 is po…