Materials Literature
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We demonstrate noncontact, high quality surface modification with spatial resolution of ~20 nm. The nanowriting is based on the interaction between the surface and the tip of an Atomic force microscope illuminated by a focused laser beam and hovering 1-4 nanometers above the surface without touching it. The floating t…
The paper has been withdrawn for some reasons
We investigate a dynamical Coulomb blockade effect and its role in the enhancement of current-current correlations in a three-terminal device with a multilevel splitter, as well as with two quantum dots. Spectral decomposition analysis shows that in the Y-terminal system with a two level ideal splitter, charge fluctua…
Solid isotopic helium mixtures have been studied by path-integral Monte Carlo simulations in the isothermal-isobaric ensemble. This method allowed us to study the molar volume as a function of temperature, pressure, and isotopic composition. At 25 K and 0.2 GPa, the relative difference between molar volumes of isotopi…
A description of phonon dynamics and charge response of the $n$-doped high-temperature superconductor (HTSC) NdCuO is presented based upon a microscopic modeling of the electronic density response. This is accomplished starting from the insulating state via the underdoped strange metallic to the more conventional meta…
We study thermal rectification in single-walled carbon nanohorns (SWNHs) by using a non-equilibrium molecular dynamics (MD) method. It is found that the horns with the bigger top angles show larger asymmetric heat transport due to the larger structural gradient distribution. This kind of gradient behavior can be furth…
Using density-functional calculations we study the structure and polarization response of tetragonal PbTiO3, BaTiO3 and SrTiO3 in a strain regime that is previously overlooked. Different from common expectations, we find that the polarizations in all three substances saturate at large strains, demonstrating a universa…
Impurity effects on the triangular antiferromagnets Ni$_{1-x}M_x$Ga$_2$S$_4$ ($M=$ Mn, Fe, Co and Zn) are studied. The 2D frozen spin-disordered state of NiGa$_2$S$_4$ is stable against the substitution of Zn$^{2+}$ ($S=0$) and Heisenberg Fe$^{2+}$ ($S=2$) spins, and exhibits a $T^2$-dependent magnetic specific heat,…
Inspired by eggshells in nature, living yeast cells were conferred with an artificial mineral coat by using a combination of the layer-by-layer (LBL) treatment with functional polymers and in situ biomimetic mineralization. The resulting hard inorganic shells have a tremendous effect on the storage, protection, delive…
Using a linear combination of atomic orbitals approach, we report a systematic comparison of various density functional theory (DFT) and hybrid exchange-correlation functionals for the prediction of the electronic and structural properties of prototypical ferroelectric oxides. It is found that none of the available fu…
Antidot lattices, defined on a two-dimensional electron gas at a semiconductor heterostructure, are a well-studied class of man-made structures with intriguing physical properties. We point out that a closely related system, graphene sheets with regularly spaced holes ("antidots"), should display similar phenomenology…
Because of their insolubility in water, nanoparticles have a limitation concerning toxicity experiments. The present study demonstrated a plant agar test for homogeneous exposure of nanoparticles to plant species. The effect of Cu nanoparticles on the growth of a plant seedling was studied, and bioaccumulation of nano…
The present work concentrated on the investigation of the influence of functional group polarity on interfacial behavior of silica glass and polyarylacetylene (PAA) resin composites. In order to achieve this purpose, the silica glass was treated with four types of silane coupling agents: γ-aminopropyltriethoxysilane;…
Room-temperature red cathodoluminescence (CL) emission (R band) arising from the paramagnetic point-defect population present in amorphous silicon oxide (SiOx) has been characterized with respect to its shift upon applied stress, according to a piezo-spectroscopic (PS) approach. The R band (found at around 630 nm) ori…
Conducting composite electrodes are versatile devices for biomedical applications showing good biocompatibility, low cost, ease of construction. They can be bulk modified with stabilised enzymes to make biosensors and electrodes for biofuel cells. Low sensitivity to flow conditions arises from the microelectrode array…
Tuberculosis (TB) is one of the most common infectious diseases known to man and responsible for millions of human deaths in the world. The increasing incidence of TB in developing countries, the proliferation of multidrug resistant strains, and the absence of resources for treatment have highlighted the need of devel…
Susceptibility purely originated from the Li-induced quasistatic dipoles in relaxor ${\text{K}}_{1\ensuremath{-}x}{\text{Li}}_{x}{\text{TaO}}_{3}$ has been extracted from low-frequency permittivity using terahertz time-domain spectroscopy. The temperature dependence of the extracted susceptibility has an anomaly at th…
In this work, hybrid chitosan/hydroxyapatite composites material were developed and characterized. The polymer matrix was first dissolved in polylactic acid, and then hydroxyapatite (HA) was added as filler material. The effects of the added amounts of a crosslinking agent (genipin) and of the concentrations of lactic…
This paper describes the generation of Pt nanoparticles inside hollow silica colloids. Solvent etching of a -Se core in a -Se@Pt@silica double-shelled colloids transformed the thin Pt layer into a number of Pt nanoparticles, decorating the interior surface of hollow silica colloids. The release rate of a -Se was direc…
The compositions and photophysical properties of luminescent ternary complexes of thiacalix[4]arene-p-sulfonate (TCAS), Tb(III), and Ag(I) ions were determined. At pH 6, Ag(I) (2)Tb(III) (2)TCAS(2) formed. Moreover, at pH 10, in the presence of a 20-fold excess of Ag(I) and a 50-fold excess of TCAS with respect to Tb(…