Materials Literature
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Antibody-directed enzyme prodrug therapy (ADEPT) is a recent development for a selective treatment of cancer, based on site-directed formation at the surface of malignant cells of cytotoxic compounds from non-toxic prodrugs with a conjugate of an appropriate enzyme and a monoclonal antibody which binds to tumour-assoc…
The crystal structures of lanthanum gallate perovskite compounds, LaGaO 3, LaGa 0.8 Mg 0.2 O 2.9, and La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.8 which is well-known as a superior oxide ion conductor, have been analyzed by neutron powder diffraction to clarify the effect of the substitutions on the perovskite structures. The cr…
The chirality effect of an opened-end single-wall carbon nanotube on field emission is studied by using the tunneling theory with the tight-binding approximation. The characteristic of the emission-current line density versus field is found to be dependence on the chirality of nanotubes. A metallic tube has a line den…
The results of an in-depth study of 1 nm thick individual clay sheets by atomic force microscopy (AFM) are presented. Several techniques have been employed, including lateral force microscopy (LFM) and force modulation microscopy (FMM). The individual clay sheets, also referred to as clay nanoplatelets in the literatu…
ZnSeO alloy was grown by molecular-beam epitaxy up to 1.3% O composition on GaAs substrate using rf plasma. The crystal structure of epitaxial ZnSeO alloy was zinc-blende. O composition was estimated by a strain-free lattice constant. No phase separation was observed by in situ reflection high-energy electron diffract…
In this letter, we report a micromechanical analysis to explain the enhanced piezoelectric coefficients in ferroelectric single crystals poled along a nonpolar axis, where the coexistence of several variants leads to a complicated domain configuration. The engineered domain configuration in the crystal is constructed…
Two new angular trinuclear copper(II) complexes of formulation [Cu(3)(HL)LL'](ClO(4)), where L' is imidazole (Him, 1) or 1-methylimidazole (1-MeIm, 2) and H(3)L is a Schiff base obtained from the condensation of salicylaldehyde and 1,3-diaminopropan-2-ol (2:1 mole ratio), are prepared from a reaction of [Cu(2)L(mu-Br)…
Doping of the nanocrystalline semiconductor ZnO with the donor In111 was achieved by the incorporation of In111 atoms during the growth process followed by a hydrothermal treatment at 473 K. The incorporation of In111 on substitutional Zn sites was shown by the perturbed γγ angular correlation technique. The structura…
We demonstrate that individual carbon nanotubes (CNTs) can be visualized with fluorescence microscopy through noncovalent labeling with conventional fluorophores. Reversal of contrast in fluorescence imaging of the CNTs was observed when performing labeling procedure in a nonpolar solvent. Our results are consistent w…
In situ annealing and melting of folded-chain single crystals of poly(l-lactic acid) (PLLA) was examined by temperature-controlled atomic force microscopy (AFM). Prominent changes in the crystal appearance during annealing could be followed in real time by the AFM at temperatures above the original crystallization tem…
The purpose of this study was to investigate the corrosion resistance of stressed NiTi and stainless steel orthodontic wires using cyclic potentiodynamic and potentiostatic tests in acid artificial saliva at 37 degrees C. An atomic force microscope was used to measure the 3-D surface topography of as-received wires. S…
We report the deposition and characterization of transparent ferroelectric/piezoelectric nanotubes of wall thickness about 40 nm, tube diameters ranging from a few hundred nanometres to 4 µm, and length about 100 µm. Comparison with other nanotubes is made and applications in dynamic random access memory trenching and…
Host-Guest Systems Based on Nanoporous Crystals
A Stone–Wales (SW) defect is a dipole of 5–7 ring pair in a hexagonal network, which is one of the most important defective structures in carbon nanotubes (CNTs) that will affect mechanical, chemical, and electronic properties of CNTs. Using the extended Hückel method, we calculated the formation energy of SW defects…
While most calculations on the properties of the ferromagnetic semiconductor GaAs:Mn have focused on isolated Mn substituting the Ga site $({\mathrm{Mn}}_{\mathrm{Ga}}),$ we investigate here whether alternate lattice sites are favored and what the magnetic consequences of this might be. Under As-rich (Ga-poor) conditi…
The doping behavior of phosphorus in ZnO thin films grown by pulsed laser deposition is examined. The transport properties of epitaxial ZnO films doped with 1–5 at. % P were characterized via room temperature Hall measurements. As-deposited films doped with phosphorus are highly conductive and n type. The origin of th…
We demonstrate the operation of an organic switching device using a uniform poly-crystalline Cu:7, 7, 8, 8-Tetracyanoquinodimethane (TCNQ) charge transfer (CT)-complex thin film that is prepared by vacuum vapor codeposition. Characteristic CT-absorption at λ=600–1200 nm was observed in the complex film in the UV-visib…
Single-walled carbon nanotubes (SWCNTs) were used to convert insulating nanoceramics to metallically conductive composites. Dense SWCNT/Al2O3 nanocomposites with CNT contents ranging from 5.7 to 15 vol % and with nanocrystalline alumina matrices have been fabricated by spark-plasma-sintering that retains the integrity…
Luminescent properties of the Eu(dinic) complex, where dinic is dinicotinic acid, were examined in the presence of silver nanoparticles in N, N -dimethylformamide. The formation of particle aggregates was observed upon mixing the particle solution with the complex solution, in which the complexes behaved like linker m…
The elastostatic Green function tensor approach, which was recently used to treat electrostriction in the numerical simulation of domain structure formation in cubic ferroelectrics, is reviewed and extended to the crystals of hexagonal and orthorhombic symmetry. The tensorial kernels appearing in the expressions for e…