Materials Literature
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In application of focused-ion-beam lithography and grazing Ar+ milling on the U-shape barrier layer of anodic alumina nanochannels, we fabricated a hexagonally symmetry aperture array with nominal diameter of 12±2nm and interspacing of 100±2nm. Besides long-range spatial ordering, the focused-ion-beam guided-grown pro…
In recent years, a large number of nano-size semiconductors have been researched for their potential applications in photovoltaic cell, optical sensor device and photocatalysts. Nano-size semiconductor particles reveal many interesting properties due mainly to their sizedependant optical properties. In this sense, man…
We have studied structural and transport properties of epitaxial NaxCoO2 thin films on (0001) sapphire substrate prepared by topotaxially converting an epitaxial Co3O4 film to NaxCoO2 with annealing in Na vapor. The films are c-axis oriented and in-plane aligned with [101¯0]NaxCoO2 rotated by 30° from [101¯0] sapphire…
Starburst dendrimers are receiving considerable attention as templates for the assembly of structured arrays of molecular components. This research motivates the development of improved methods for dendrimer characterization-specifically, for determining the numbers, distributions of numbers, and spatial distribution…
Abstract Nylon‐6/montmorillonite nanocomposites with different dispersion states of clay and different clay loadings were prepared by melt processing. The nanostructure and mechanical properties were also investigated. The influence of the montmorillonite dispersion state and clay content on the tensile fracture morph…
We investigate the effect of adding nonpolar solutes at atmospheric pressure on water's temperature of maximum density, isothermal compressibility, and isobaric heat capacity, using a statistical mechanical model of water solutions [H. S. Ashbaugh, T. M. Truskett, and P. G. Debenedetti, J. Chem. Phys. 116, 2907 (2002)…
We report observation of ring-shaped morphology formed in thin films of a cylinder-forming polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer cast from 1,1,2,2-tetrachloroethane (Tetra-CE) solution via relatively fast solvent evaporation rates, in which Tetra-CE is a good solvent for both blocks but…
Vertically well-aligned ZnO nanorods were synthesized without employing any metal catalysts on various substrates including glass, Si(111), 6H-SiC(0001) and sapphire (0001), which were pre-coated with c -oriented ZnO buffer layers, by simple physical vapour deposition. The alignments of the ZnO nanorods on the differe…
Self-catalytic behavior of multi-walled carbon nanotubes is proposed and validated experimentally under the conditions in which metal catalysis was previously figured to work only. The self-catalysis could support the nanotube nucleation and radial and axial developing processes. This result should lead to a new and b…
We present ab initio calculations of transport properties of the multiwalled carbon nanotubes (MWNTs). The tube-electrode contact mode is found to have crucial effects on the transport behavior of MWNTs. It is the outmost-shell contact between MWNT and electrodes that leads to the extensively observed outmost-shell-co…
An efficient two-step, chemoenzymatic synthesis of N -trifluoroacetyl doxorubicin-14-valerate (Valrubicin) from doxorubicin hydrochloride salt is reported. The key step is a lipase-catalyzed regioselective esterification of N -trifluoroacetyl doxorubicin using commercially available valeric acid as the acyl donor. The…
Ti 3 Si C 2 ∕ 3 Y - TZP (3mol% Yttria-stabilized zirconia) composites were prepared by spark plasma sintering. The effective dc conductivities of the composites have been measured and the percolation threshold was determined. The dielectric behavior of the composites was studied in the frequency range 102–4×107Hz. The…
A fluorescence probe technique was used to investigate the role of the solvent in the syndiotactic polystyrene (sPS) thermoreversible gel system. Four probe molecules with different molecular sizes were dispersed throughout the gels, and their fluorescence anisotropy values were examined in detail for a range of sPS c…
The photochromic ligand bis(terpyridyl)hexaarylbiimidazole (bistpy-HABI) and the Fe(II) complex of bistpy-HABI with formula [{Fe(tpy)}2.bistpy-HABI](PF6)4.4H2O were synthesized and characterized. Bistpy-HABI is readily cleaved into a pair of terpyridyltriphenylimidazolyl radicals (tpy-TPI*) on irradiation with UV ligh…
We demonstrate the wafer-scale integration of single-electron memories based on carbon nanotube field-effect transistors (CNFETs) using a process based entirely on self assembly. First, a "dry" self-assembly step based on chemical vapor deposition (CVD) allows the growth and connection of CNFETs. Next, a "wet" self-as…
In this article, the surface erosion of spin-coated poly(trimethylene carbonate) (PTMC) films by lipase solutions from Thermomyces lanuginosus was studied using atomic force microscopy (AFM). PTMC films (23-48 nm thick) were stable in water at 37 degrees C for 16 h, while after immersion in lipase solutions at 37 degr…
In an effort to gain insight into the activation energies and reaction enthalpies of the chemical functionalization of carbon and boron nitride nanotubes, calculations using density functional theory have been carried out for the cycloaddition of a heavy carbene to a single-walled carbon (SWCNT; C(130)H(20)) and a bor…
We present density functional calculations of the total energies and equations of state of the monoclinic, tetragonal, cubic, orthorhombic-I (Pbca) and orthorhombic-II (cotunnite)-structure phases of zirconia and hafnia in the local density (LDA) and generalized-gradient (GGA) approximations. The accuracy of the LDA a…
A large-scale scaffold processing method with injection molding has been successfully developed. Water was used as afoaming agent for the new technique. NaCl was used as a porogen to achieve an open-cell structure. Organic solvents, which are common foaming agents for polyurethane, where not used. Toxic remains in the…
Two 3,5-disubstituted sulfonamide catechol ligands were synthesized. Tris(ligand) iron(III) complexes were prepared and investigated as MRI contrast agents. Longitudinal relaxivity (r1) values were determined for the complexes. The r1 values in water were substantially higher than those of typical six-coordinate iron(…