Materials Literature
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Flexible "pacman" scaffolds built upon a calix[4]arene platform bearing a [18]crown-6 ether and either two OH functions or two OPr groups at the lower rim have been used to generate donor-acceptor (D-A) dyads incorporating a zinc-porphyrin donor and a free-base porphyrin acceptor. Through-space singlet energy transfer…
Through a detailed study of the specific heat, resistivity, and susceptibility under pressure in polycrystalline and single-crystal ${\text{CoS}}_{2}$, we demonstrate that the thermodynamic and transport properties of this system are governed by spin-density fluctuations. We give the correct $(P,T)$ coordinates of its…
Racemic 2,4-di-O-benzoyl-myo-inositol-1,3,5-orthoacetate, which normally crystallizes in a monoclinic form (form I, space group P2(1)/n) could be persuaded to crystallize out as a metastable polymorph (form II, space group C2/c) by using a small amount of either D- or L- 2,4-di-O-benzoyl-myo-inositol-1,3,5-orthoformat…
Within the framework of macroscopic quantum electrodynamics, the resonant van der Waals potential experienced by an excited two-level atom near a planar magnetoelectric two-layer system consisting of a slab of left-handed material and a perfect mirror is studied. It is shown that the disregard of material absorption l…
Dimension-tunable ceria nanostructures including 0D uniform nanocrystals, 2D polycrystalline assembly, and 3D mesoporous framework were selectively synthesized from the same cerium precursor of Ce(OC 8 H 17 ) 4 with the designed solution methods. The thermolysis of Ce(OC 8 H 17 ) 4 in tri- n -octylphosphine oxide and…
Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
In chemical vapor deposition (CVD) processes thermal decomposition of a precursor is the key step that produces a thin-film deposit, and ideally the ligands associated with the precursor are cleanly lost into the gas phase. However, there are problems as the ligands may fragment and lead to impuriti...
The poly-2-hyroxyethyl methacrylate (PHEMA)/clay nanocomposite was synthesized by in situ atom transfer radical polymerization (ATRP) from initiator moieties immobilized within the silicate galleries of the clay particles. To produce organically modified montmorillonite (MMT) that has ATRP initiator moiety, a new cata…
We report on the formation of organized sub-micron YBa(2)Cu(3)O(7) (YBCO) dots induced by irradiating femtosecond laser pulses on YBCO films prepared by pulse laser deposition with fluence in the range of 0.21 approximately 0.53 J/cm(2). The morphology of the YBCO film surface depends strongly on the laser fluences ir…
The distribution of microamounts of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y nitrates between aqueous solutions of HNO 3 and multiwalled carbon nanotubes noncovalently modified with tetraphenylmethylenediphosphine dioxide (L) was considered depending on the concentration of HNO 3 in the aqueous phase…
Nanocomposites based on carboxylated nitrile rubber (XNBR) and organomodified clay were prepared under different mixing conditions. At higher mixing temperatures, a mixed intercalated/exfoliated morphology was obtained as evidenced by X-ray diffraction studies and transmission electron microscopy. A remarkable improve…
The collapsing phenomenon of cavitation bubbles generates extremely high local pressures and temperatures that can be utilized for the chemical oxidation process. This process is carried out in cavitation reactors. A Venturi tube is one of the most common forms of hydrodynamic cavitation reactors, which is suitable fo…
The structural, morphological and thermal properties of polyamide-6 and polyamide-6/66 clay nanocomposites have been studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and static an…
Wurtzite (Mg 0.40 Zn 0.60 O) thin films have been grown on quartz substrates by using the radio frequency magnetron sputtering technique, and a metal−semiconductor−metal Schottky barrier photodetector has been fabricated from these films. The photodetector exhibits a peak responsivity at 276 nm and a very sharp cutoff…
Epitaxiales Aufwachsen eines Koordinationsnetzwerks mit Cyanidbrücken auf Kernpartikeln erzeugt Kern-Schale-Nanopartikel. Die Schalendicke lässt sich im Nanometerbereich einstellen, und der Prozess kann mit unterschiedlichen Metallionen wiederholt werden, um Partikel mit mehreren Schalenschichten und kombinierten magn…
Fully conjugated π-expanded macrocyclic oligothiophenes with 60π–180π electron systems have been synthesized using modified McMurry coupling reaction as a key step. X-ray analyses of 60π and 72π systems revealed unique molecular and packing structures, reflecting planar cyclic structures with large inner cavities. All…
The chemical deterioration of vegetable tanned leather is caused by acid hydrolysis and oxidation due to environmental deteriorative factors like air pollutants, heat and light. In addition, the type of tannin material influences the rate of deterioration. The degree of deterioration can be measured by the fall in the…
Recently, nanotechnology has developed to a stage that makes it possible to process magnetic nanoparticles for the site-specific delivery of drugs. To this end, it has been proposed as biomaterial for drug delivery system in which the drug release rates would be activated by a magnetic external stimuli. Alginate has b…
In this letter, an accurate semi-analytical model for the intrinsic gate capacitance of carbon nanotube (CN)-array based back-gated field-effect transistors (FETs) is proposed. The model accounts for electrostatic screening effect for any given number of nanotubes, their diameter, pitch, and gate-dielectric thickness.…
Abstract Second‐harmonic generation and two‐photon induced photoluminescence from arrays of ZnO nanowires and single nanowires under excitation with femtosecond pulses is experimentally studied. The ratio of relevant components of the nonlinear χ (2) tensor is obtained. The excitation of the nanowire array with femtos…