Materials Literature
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We have designed and developed a unique amphiphilic dopant molecule, 4-[4-hydroxy-2((Z)-pentadec-8-enyl)phenylazo]-benzenesulfonicacid, from a renewable resource, cardanol, which acts as a fluorescent probe and structure-directing agent for polyaniline nanomaterials. The amphiphilic dopant is fluorescing in water and…
Broadband dielectric measurements of poly(vinyl pyrrolidone) (PVP)-monohydroxyl alcohol mixtures of various normal alcohols with the number of carbon atoms per molecule ranging from 1 to 9 were made in the frequency range of 20 Hz to 20 GHz at 25 degrees C. Two relaxation processes due to the reorientation of dipoles…
High and dry: The synthesis in vitro of longer-chain cellulose with more than 100 anhydrous glucopyranose units in the polymer has been performed by a new technique for glycosynthesis. This method uses enzymatic polymerization with enzyme/surfactant complexes that act in nonaqueous organic media.
Silica-based rigid monoliths exhibiting a trimodal hierarchical pore system have been successfully prepared through coating of a ceramic foam (CF) with sub-micro-/nanometric mesoporous particles (as building blocks). We have selected a bimodal porous silica, denoted as UVM-7 (a nanometric version of the well-known MCM…
The phonon dispersions of LiD, LiH and NaH for B 1 and B 2 phases are computed using density-functional perturbation theory (DFPT) with both local density (LDA) and generalized gradient (GGA) approximations. It is found from the phonon dispersion curves that the B 2 phase is unstable at low pressure for all the system…
The aim of this study was to synthesize and characterize the self-assembly of a new family of bridged silsesquioxanes containing a pendant hydrophobic chain in the organic bridge. The precursor of this hybrid was obtained by the reaction of glycidoxypropyl(trimethoxysilane) (GPMS) (2 mol) with dodecylamine (1 mol). Po…
Titanium silicon carbide (Ti 3 SiC 2 ) and Ti 3 SiC 2 ‐based composite powders were synthesized by isothermal treatment in an inert atmosphere as a function of initial compositions (mixtures). A high content of TiC was obtained in the final product when the initial mixtures contained free carbon. The use of TiC as a r…
Lengthy molecular dynamics (MD) simulations were performed at constant atmospheric pressure and different temperatures for the series of the 4-n-alkyl-4'-cyanobiphenyls (nCB) with n = 6, 7, and 8. The accurate atomistic force field (Bizzarri, M.; Cacelli, I.; Prampolini, G; Tani, A. J. Phys. Chem. A 2004, 108, 10336),…
The alternate deposition of exponentially and linearly growing polyelectrolyte multilayers leads to the formation of multicompartment films. In this study, a new system consisting in nanometer-sized multilayer barriers deposited on or between multilayer compartments was designed to respond to mechanical stimuli and to…
The surrounding shapes the box: The zinc porphyrin dimer 1 bearing pyridyl groups can chiroptically sense an asymmetric hydrocarbon, such as limonene, by forming the homochiral box-shaped tetrameric assembly BOX⊥. As the BOX⊥ formed is enantiomerically enriched, the optical purity as well as the absolute configuration…
In this work, we report the optical properties of Nd3+ ions in tellurite glasses (TeO2-TiO2-Nb2O5) for two different Nd3+ concentrations. Judd-Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime and stimulated emission cross section of the transition. The n…
We present a computer simulation study on the crystalline phases of hard ellipsoids of revolution. For aspect ratios >or=3 the previously suggested stretched-fcc phase [Frenkel and Mulder, Mol. Phys. 55, 1171 (1985)] is replaced by a different crystalline phase. Its unit cell contains two ellipsoids with unequal orien…
Abstract Understanding the relationship between the number‐average molecular weight ( M n ) and the shape memory behavior of polymers is crucial for a complete picture of their thermomechanical properties, and hence for the development of smart materials, and, in particular, in textile technology. We report here on th…
Biological systems are capable of remarkable control over crystal growth, producing morphologically complex single crystals with curved surfaces. We have previously demonstrated that crystals with identical morphological complexities can be produced synthetically using templating routes. This article provides a detail…
Gd-loaded nonspherical liposomes represent a new family of MRI agents that show contrast-enhancing ability upon applying different image acquisition modes. In fact they can act either as T 1 - or T 2 - or CEST- agents. For the first time a Gd complex is endowed with detectable shift reagent properties.
Abstract Azido–Ni II complexes of dinuclear, [Ni 2 (trpn) 2 (μ 1,3 ‐N 3 ) 2 ](ClO 4 ) 2 ( 1 ), and monodimensional structures cis ‐[Ni(abap)(μ 1,3 ‐N 3 )] n (ClO 4 ) n ( 2 ) and cis ‐[Ni(Me 6 trien)(μ 1,3 ‐N 3 )] n (ClO 4 ) n · n H 2 O ( 3a ) as well as the monomer [Ni(Me 6 trien)(N 3 )]ClO 4 ( 3b ) {trpn = tris(3‐ami…
Well-dispersed YBO(3):Eu nanocrystals have been fabricated by a solvothermal method. The size and morphology of the products are controlled successfully via adjusting the reaction conditions. The prepared YBO(3):Eu phosphors were characterized by powder X-ray diffraction, transmission electron microscopy, and other te…
Crystallization of the poorly durable Na 2 MoO 4 phase able to incorporate radioactive cesium must be avoided in SiO 2 –Al 2 O 3 –B 2 O 3 –Na 2 O–CaO glasses developed for the immobilization of Mo‐rich nuclear wastes. Increasing amounts of B 2 O 3 and MoO 3 were added to a SiO 2 –Na 2 O–CaO glass, and crystallization…
The structural energetics and diffusion mechanisms of the two most important point defects in rutile $\mathrm{Ti}{\mathrm{O}}_{2}$, the oxygen vacancy $({V}_{\mathrm{O}})$ and the titanium interstitial $({\mathrm{Ti}}_{I})$, are examined using the ab initio pseudopotential total-energy method. The two defects are foun…
The structure and the properties of the quasi-one-dimensional composites, i.e., carbon nanotubes filled with nanowires or clusters of $3d$ metals ($\mathrm{M}=\mathrm{Ti}$, Fe, and Zn), have been studied in the framework of the density functional-based tight binding method. We show that the accommodation of nanosized…