Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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(…
Three polyether sulfones were prepared by polycondensation of 4,4'-difluorodiphenyl-sulfone and 1,6-dianhydrosorbitol (isosorbide), 1,6-dianhydromannitol (isomannide) or 1,6-dianhydroiditol (isoidide) in dimethyl sulfoxide (DMSO). Depending on the optimization of the reaction conditions, moderate to high molecular wei…
The crystal structures of poly(hexamethylene sebacate- co -hexamethylene adipate), P(HSe- co -HA), copolymers have been studied with Fourier transformation infrared spectroscopy (FTIR) and X-ray fiber diffraction. All characteristic FTIR absorption bands of the crystals of HSe and HA comonomers are present in all copo…
Oxidation per carboxylic acid: Upon incorporation into a suitable tripeptide, per-aspartate can epoxidize olefins that contain hydrogen-bonding groups with high enantioselectivity (up to 92 % ee). Catalytic asymmetric epoxidation can be effected with hydrogen peroxide as the terminal oxidant and carbodiimide as the st…
We have studied the planar Hall effect (PHE) in a Mn $\ensuremath{\delta}$-doped GaAs-based heterostructure consisting of Mn $\ensuremath{\delta}$-doped GaAs and $p$-type AlGaAs. We observe a distinct and large PHE and a specific in-plane [110] uniaxial magnetic anisotropy below the ferromagnetic transition temperatur…
Abstract A hydrogen‐bonded helical columnar liquid crystal was synthesized, in which the helical structure is induced by a centered triphenylene derivative bearing chiral side‐chains. The triphenylene derivative, 2,6,10‐tris(carboxymethoxy)‐3,7,11‐tris((S)‐(‐)‐2‐methyl‐1‐butanoxy)triphenylene ( TPC4(S) ), and a dendri…
Since the initial description in early 2006 (1), a firm epidemiologic link has been established between gadolinium-based contrast (GBC) exposure and development of nephrogenic systemic fibrosis (NSF). When looking back in time, it is interesting to recall that GBC-magnetic resonance imaging (MRI) garnered increased us…
This paper describes a new device and a method to determine the radon diffusion coefficient in damp-proof membranes developed in the Czech Republic. The main advantage of the device is that it enables tests to be carried out in all the known measuring modes used throughout Europe. Two recently developed computer progr…