Materials Literature
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Deep hole traps in boron-doped diamond epitaxial layers are studied by means of several types of deep-level transient spectroscopy and density-functional theory calculations. Standard deep-level transient spectroscopy and high-resolution isothermal transient spectroscopy permit to identify nine deep hole traps. Their…
The synthesis and structures of two new isostructural mononuclear [Ln(L)(NO(3))(H(2)O)(3)](NO(3))(2) complexes, with Ln = Tb (complex 1) and Eu (complex 2), which display high activity in the hydrolysis of the substrate 2,4-bis(dinitrophenyl)phosphate, are reported. These complexes displayed catalytic behavior similar…
We report specific-heat measurements on well characterized single crystals of the Fe-based superconductor ${\text{BaFe}}_{2}{({\text{As}}_{0.7}{\text{P}}_{0.3})}_{2}$, from the same batch on which previous penetration depth, NMR, and thermal-conductivity measurements have observed a high density of low-energy excitati…
We present a three-dimensional model of intergranular hydrogen-embrittlement (HE) that accounts for: (i) the degradation of grain-boundary strength that arises from hydrogen coverage; (ii) grain-boundary diffusion of hydrogen; and (iii) a continuum model of plastic deformation that explicitly resolves the three-dimens…
We synthesized new layered iron arsenide oxides (Fe 2 As 2 )(Sr 4 (Sc,Ti) 3 O 8 ), (Fe 2 As 2 )(Ba 4 Sc 3 O 7.5 ), and (Fe 2 As 2 )(Ba 3 Sc 2 O 5 ). The crystal structures of these compounds are tetragonal with a space group of I 4/ m m m . The structure of (Fe 2 As 2 )(Sr 4 (Sc,Ti) 3 O 8 ) and (Fe 2 As 2 )(Ba 4 Sc 3…
We have explored light harvesting of the complex of ZnO nanoparticles with the biological probe Oxazine 1 in the near-infrared region using picosecond-time-resolved fluorescence decay studies. We have used ZnO nanoparticles and Oxazine 1 as a model donor and acceptor, respectively, to explore the efficacy of the Först…
The reported observation of two anomalies in the intensity of the magnon Raman peaks of BiFeO₃ at 140 and 200 K (Singh et al 2008 J. Phys.: Condens. Mater 20 252203; Cazayous et al 2008 Phys. Rev. Lett. 101 037601) led to the hypothesis that such anomalies might originate from a spin reorientation transition. In order…
The potentials of low-pressure capacitively coupled RF oxygen and argon plasmas for the activation of polyester fibers surface that can enhance the deposition of colloidal TiO(2) nanoparticles were discussed. SEM and XPS analysis confirmed the plasma-induced morphological and chemical changes on the surface of polyest…
We demonstrate the synthesis and use of a spiropyran functional polymer to form highly ordered honeycomb materials by the breath figure technique, which is based on the self-assembly of water droplets. These materials undergo rapid and intense color changes both in solution and as porous films by irradiation with ligh…
Epitaxial thin films of strontium titanate doped with different concentrations of lanthanum and oxygen vacancies were grown on LSAT substrates by pulsed laser deposition technique. Films grown with 5−15% La doping and a critical growth pressure of 1−10 mTorr showed high transparency (>70−95%) in the UV−visible range w…
This work involves chemical modification of cotton fabrics by natural, biocompatible, and biodegradable polysaccharide — chitosan — followed by incorporating silver nanoparticles in the fabrics. The excellent chelating property of chitosan binds the silver metal ions that are later on reduced to nanoparticles giving r…
Oxidized multiwalled carbon nanotubes were produced by strong acid treatment with the aid of sonication. Short-length carbon nanotubes obtained by filtration of the oxidized carbon nanotubes were analyzed by means of X-ray photoelectron spectroscopy, Raman and photoluminescence spectroscopies, and scanning electron mi…
In this communication we provide the first UHV-STM images and STM-based current-voltage (I-V) and orbital mediated tunneling spectroscopy (OMTS) data on a self-assembled porphyrin nanostructure at the single structure level. We will show that transverse conductivity over distances less than 10 nm can occur by barrier…
The aggregation behavior of 5,10,15-trisphenyl-20-(3,4-dihydroxy phenyl) porphyrin (L) in aqueous solution has been studied as a function of pH and concentration with the help of steady state absorption and emission spectroscopy. Our studies revealed that, for a particular concentration range, molecules of L undergo a…
Octreotide (Oct) is a potential ligand due to its high affinity to somatostatin receptors (SSTRs), especially subtype 2 (SSTR2), as many tumor cells specifically overexpress SSTR2. In this study, we conjugated Oct to the PEG end of DSPE-PEG and prepared a novel doxorubicin (DOX)-loaded and Oct-modified sterically stab…
The kinetics, mechanism, and activation energy of H 2 O 2 decomposition in ZrO 2 particle suspensions were studied. The obtained first-order and second-order rate constants for the decomposition of H 2 O 2 in the presence of ZrO 2 at T = 298.15 K produced the values k 1 = (6.15 ± 0.04) × 10 −5 s −1 and k 2 = (2.39 ± 0…
A new layered iron arsenide oxide (Fe 2 As 2 )(Ca 4 (Mg,Ti) 3 O y ) was discovered. Its crystal structure is tetragonal with a space group of I 4/ m m m consisted of the anti-fluorite type FeAs layer and blocking layer of triple perovskite cells and is identical with (Fe 2 As 2 )(Sr 4 (Sc,Ti) 3 O 8 ) discovered in our…
Novel benzo[f]quinoxalino[2,3-β]porphyrin carboxylic acid (ZnBQA) and cyanoquinoxalino[6,7-β]porphyrin carboxylic acid (ZnQCA) have been synthesized to evaluate the effects of the π-elongation and the fused position of quinoxaline-fused porphyrins on the optical, electrochemical, and photovoltaic properties. ZnBQA sho…
Since the 1970's, theories of deformation and failure of amorphous, solidlike materials have started with models in which stress-driven, molecular rearrangements occur at localized flow defects via "shear transformations". This picture is the basis for the modern theory of "shear transformation zones" (STZ's), which i…
Development of an in vitro prevascularized scaffold is of great importance to produce vascularization in tissue-engineered devices and for other clinical purposes. To this aim, polymer fibres covered with human umbilical vein endothelial cells (HUVECs) were used to induce directional 'angiogenesis' in a 3D co-culture…