Materials Literature
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The dc and ac conductive properties of ZnO QDs-SiO2 and ZnO QDs-SiO(x)N(y) nancomposite films prepared by the target-attached sputtering method are investigated. Both two nanocomposite samples reveal a typical characteristic of a metal-oxide varistor (MOV) on the J-E plots with distinct threshold electric fields (E(th…
Abstract Organic fluorescent molecules are infiltrated in the channels of zeolite L nanocrystals, thus creating organic–inorganic fluorescent nanoparticles. Combined with dielectric matrices, these fluorescent nanopigments open the way to the realization of novel optical devices. In this paper, the optical measurement…
Spin coating of multicomponent precursor solutions was employed in conjunction with block copolymer nanotemplates to fabricate nanopatterned functional multielemental materials. Nanodot and nanowire arrays of several multielemental materials exhibiting optoelectronic and multiferroic properties have been fabricated on…
Biodegradable poly(butylene succinate-co-butylene adipate) (PBSA)/carboxyl-functionalized multi-walled carbon nanotubes (f-MWNTs) nanocomposites were prepared through solution casting method with different f-MWNTs contents ranging from 0.5 to 2 wt%. Scanning electron microscopic observations reveal a fine dispersion o…
A simple method is demonstrated to synthesize high-quality cup-stacked carbon nanotubes (CSCNTs) with short length. The as-synthesized CSCNTs are 0.2-3.2 microm in length, even shorter than the ball-milled long CSCNTs (approximately 7 microm). These CSCNTs have a diameter of 80-120 nm and a hollow channel of 60-100 nm…
Most atomistic simulation studies of polyethylene employ a united-atom representation to reduce complexity and computational costs. The ramifications of such an approximation have been discussed with respect to structural properties but have not been examined with respect to thermal properties. Here we investigate the…
We describe an in vitro culture process that uses 100-microm diameter poly(ethylene terephthalate) monofilaments as contact guidance of human umbilical vein endothelial cells (HUVECs) to orient the development of microvessels in a 3D environment. Untreated fibers, distanced either by 0.05, 0.1, 0.15, or 0.2 mm were fi…
A novel ligand to the synthesis of nanoparticles has been employed in this study. A Tetramethylthiuram disulphide cadmium complex (abundant in sulphur atoms) was used as a single-source precursor for the synthesis of CdS nanoparticles. The CdS nanoparticles were synthesized under various conditions and were characteri…
This paper focuses on the preparation and characterization of Poly(methyl methacrylate)/multi-walled carbon nanotube composites through ex-situ and in-situ processes. The extent of dispersion and fracture morphology was studied by TEM, AFM, SEM and FESEM. The increase in conductivity at percolated loading of 2.91 wt%…
Fibrous nanocomposite scaffolds were electrospun from dispersions of hydroxyapatite nanoparticles (nanoHA) in polycaprolactone (PCL) with varying nanoHA contents (from 0% to 50% by weight). Such scaffolds were produced to mimic the nano-features of the extracellular matrix (ECM) for natural bone tissue regeneration. N…
We formulate and study the effective low-energy quantum theory of interacting long-wavelength acoustic phonons in carbon nanotubes within the framework of continuum elasticity theory. A general and analytical derivation of all three- and four-phonon processes is provided and the relevant coupling constants are determi…
A newly prepared single-component molecular metal, [Pt(tmdt)2], exhibited very high conductivity and metallic behavior down to 4 K in the compacted polycrystalline state. A ‘conducting paint’ of [Pt(tmdt)2] obtained by kneading the microcrystals with lacquer and thinner showed metallic conductivity at around room temp…
In order to understand the morphology of oxidized positions in single-wall carbon nanotubes (SWNTs), several chemical models, resulting from the interaction of an armchair (5,5) carbon nanotube (a(5,5)) with molecular oxygen and water, have been proposed. Structural and thermodynamic properties were calculated using t…
Octakis(3-chloropropyl)octasilsesquioxane, obtained recently by a new method, has enabled a highly efficient synthesis of a whole family of cube-like T8 silsesquioxanes by nucleophilic substitution of chlorine atom with appropriate nucleophilic agents. Five functionalized silsesquioxanes, i.e., octakis[3-(methacryloyl…
Bi 2 Te 3 thin films, composed of ordered nanowire arrays, have been successfully fabricated by a convenient physical vapor deposition method without using any template. The composition and microstructure of these films were determined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and high res…
Binary metal-semiconductor Zn/ZnO core−shell nanorods have been synthesized through an ethylenediamine-assisted low-temperature hydrothermal process. Well-crystalline wurtzite phase ZnO was epitaxially grown along the [0100] direction, perpendicular to the single-crystalline Zn nanorod cores grown along the [0002] dir…
In the past, the crystallographic relationship between the γ-phase and the α-phase in isotactic polypropylene (i-PP) was extensively studied and established via i-PP oligomers of which the γ-phase can be formed at atmospheric pressure. We attempt to investigate how the epitaxial domination of the crystal morphologies…
Recently, several groups of investigators (Anderson, Halas, Zharov, El-Sayed and their co-workers (Pitsillides et al 2003 Biophys. J. 84 4023-31, Zharov et al 2003 Appl. Phys. Lett. 83 4897-9, Zharov et al 2004 Proc. SPIE 5319 291-9, Loo et al 2005 Nano Lett. 5 709-11, Gobin et al 2007 Nano Lett. 7 1929-34, Fu et al 2…
Orotidine 5'-monophosphate decarboxylase (OMPDC) is an exceptionally proficient catalyst: the rate acceleration (k(cat)/k(non)) is 7.1 x 10(16), and the proficiency [(k(cat)/K(M))/k(non)] is 4.8 x 10(22) M(-1). The structural basis for the large rate acceleration and proficiency is unknown, although the mechanism has…
We have performed global structural optimizations for neutral lead clusters Pb(n) (n = 2-20) by using a genetic algorithm (GA) coupled with a tight-binding (TB) potential. The low-energy structures identified from a GA/TB search were further optimized at the DFT-PBE level. The calculated results show that the Pb(n) (1…