Materials Literature
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We realize the planar lens of anisotropic compensated bilayer through the implementation of anisotropic metamaterials by periodic transmission-line circuits based on different unit cells of loaded microstrip grids. The electromagnetic wave propagation in such transmission-line circuits has been analyzed using microwav…
ZnO thin films were grown by cathodic deposition on indium tin oxide (ITO)-covered glass substrates from a simple aqueous zinc nitrate solution. Cyclic voltammetry (CV) experiments were performed to verify the reaction mechanism. X-ray diffraction measurements indicated that the as-grown films were of hexagonal wurtzi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFacile Synthesis of Semiaromatic Poly(amic acid)s from trans-1,4-Cyclohexanediamine and Aromatic Tetracarboxylic DianhydridesTomohito Ogura and Mitsuru UedaView Author Information Department of Organic & Polymeric Materials, Graduat…
In this paper, sequential experiments were designed to explore the possibility of sodium borohydride synthesis by reaction of sodium borates with Al and hydrogen. It was found that NaBH 4 cannot be formed by reaction of NaBO 2 with Al and hydrogen but can be formed by reaction of Na 4 B 2 O 5 with Al and hydrogen. NaB…
Production of OH in the reaction of the neopentyl radical with O2 has been measured by a laser photolysis/cw absorption method for various pressures and oxygen concentrations at 673, 700, and 725 K. The MIT Reaction Mechanism Generator (RMG) was used to automatically generate a model for this system, and the predicted…
The sensitivity of the torsional pendulum demonstrates the self-shape-memory effect in different types of spider draglines. Here we report the time-resolved noncovalent bonds recovery in the protein structure. The torsional dynamics of such multilevel structure governed by reversible interactions are described in the…
We observe strong softening of optical-phonon modes in superconducting $({T}_{c}=4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ boron-doped diamond near the Brillouin-zone center using inelastic x-ray scattering from a chemical vapor deposition grown highly oriented sample. The magnitude of the softening, and our observat…
The reaction of Nd(SePh)3 with SeO2 and Hg in pyridine gives the dodecanuclear cluster [(py)18Nd12O6Se4(Se2)4(SePh)4(Se2Ph)2Hg2(SePh)4][(Hg(SePh)3]2. In this compound the 12 Nd(III) ions are stacked in four sets of Nd3, with pairs of tetrahedral oxo ligands separating the Nd3 planes and Se, SeSe, SePh, pyridine, and H…
The cathodoluminescence (CL) spectrum of the synthetic sapphire single crystal has been studied with respect to the different crystallographic planes of the crystal in order to describe the tensorial stress dependence of the band related to oxygen defects. Experiments provide the link between CL spectral shift and str…
Ce chapitre passe en revue les progres recemment accomplis dans le developpement de membranes a conduction ionique ou mixte ionique-electronique pour la separation de l'oxygene ou de l'hydrogene a haute temperature. L'etat de l'art est essentiellement centre sur le developpement de nouveaux materiaux et d'architecture…
Abstract Proper filler‐matrix compatibility is a key factor in view of obtaining nanocomposites with well‐dispersed nanofillers displaying enhanced properties. In this respect, polymer‐filler interaction can be improved by a proper combination of matrix and nanofiller polarities. This is explored for matrices ranging…
The excitation energy migration of acridine orange (AO) immobilized in deoxyribonucleic acid (DNA) thin film was investigated by time-resolved fluorescence and fluorescence anisotropy decay measurements. Polyvinylalcohol (PVA) was used as a reference matrix. The absorption and fluorescence spectra indicated that the m…
A two-dimensional array of polyoxomolybdate nanoball ([Mo VI 72 Mo V 60 O 372 (CH 3 COO) 30 (H 2 O) 72 ] 42 -, Mo 132 ) was successfully constructed by a Langmuir−Blodgett (LB) semiamphiphilic method by using Mo 132 aqueous solution as a subphase and dimethyldioctadecylammonium (DODA) as a cationic amphiphile. Conserv…
A study of the local atomic structure of the promising thermoelectric material $\ensuremath{\beta}\text{\ensuremath{-}}{\mathrm{Zn}}_{4}{\mathrm{Sb}}_{3}$, using atomic pair distribution function (PDF) analysis of x-ray- and neutron-diffraction data, suggests that the material is nanostructured. The local structure of…
A novel conducting polymer poly( o -dihydroxybenzene) (P o DHB) film was synthesized electrochemically by the direct anodic oxidation of o -dihydroxybenzene ( o DHB) in boron trifuoride diethyl etherate. The oxidation potential onset of P o DHB in this medium was measured to be only 0.66 V versus a saturated calomel e…
Abstract Porous functional polymer supports are a class of material of wide interest due to the possibility of immobilising reactive species. A simplified procedure was applied for the preparation of porous polymer supports using a water‐in‐oil‐in‐water multiple emulsion. The primary emulsion was a high internal phase…
This paper reports the use of a range of amino acids to construct diverse gelators, employing structures in which Boc-protected amino acids are attached to either end of an aliphatic diamine spacer chain. The choice of amino acid determines whether nanoscale self-assembly takes place and controls the properties of the…
The different mechanisms involved in the alloying of epitaxial nanocrystals are reported in this Letter. Intermixing during growth, surface diffusion, and intraisland diffusion were investigated by varying the growth conditions and annealing environments during chemical vapor deposition. The relative importance of eac…
The ground-state phase diagram of the half filled one-dimensional Holstein-Hubbard model contains a charge-density-wave (CDW) phase, driven by the electron-phonon $(e\text{\ensuremath{-}}ph)$ coupling, and a spin-density-wave (SDW) phase, driven by the on-site electron-electron $(e\text{\ensuremath{-}}e)$ repulsion. R…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTEnd-Group-Catalyzed Ring-Opening Polymerization of Trimethylene CarbonateJonas Mindemark, Jöns Hilborn, and Tim BowdenView Author Information Department of Materials Chemistry, Polymer Chemistry, Uppsala University, Box 538, SE-751 21 U…