Materials Literature
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Two new organic–inorganic hybrid compounds based on polyoxometalates (POMs) and pyridyl imidazole, [Co(pyim)3][HPW12O40] · 4H2O (1) and [Ni(pyim)3]2[] · 1.5H2O (2) (pyim = 2-(2-pyridyl)-imidazole), have been hydrothermally synthesized. The structures of 1 and 2 were determined by single-crystal XRD. Other characteriza…
Nanoparticles of silver and copper have been synthesized by reduction of aqueous silver nitrate and copper chloride solutions with sodium borohydride in anionic water-in-oil (w/o) microemulsions, sodium dodecyl sulphate (SDS)/1-pentanol/cyclohexane/water. Scanning electron microscopic (SEM) images, energy dispersive s…
The fabrication of silver nanoparticles covered with polymers with a well-defined core-shell structure and the quantitative evaluation of the plasmonic enhancement effect on a photochemical reaction in the vicinity of these silver nanoparticles individually dispersed in a medium are described. The photocycloreversion…
Chromate (CrVI) has emerged as a widespread environmental contaminant found in groundwater and surface water, and there is a great need for rapid detection and monitoring of this contaminant. Normal Raman scattering (NRS) spectroscopy with a detection limit of CrVI at concentrations of 0.2 g/L was attached. And surfac…
(57)Fe Mössbauer spectroscopy was applied to investigate the superconductor parent compound Fe(1+x)Te for x = 0.06, 0.10, 0.14, 0.18 within the temperature range 4.2-300 K. A spin density wave (SDW) within the iron atoms occupying regular tetrahedral sites was observed, with the square root of the mean square amplitud…
Using (57)Fe Mössbauer spectroscopy, three examples of coordination compounds with different topologies containing Fe(III) and Ln(III) ions (Dy(III) and Tb(III); see diagram; insets: clusters cores) were analyzed. In the same crystal field environment, Dy and Tb ions show different degrees of anisotropy, which can be…
Abstract Polyethylene samples were surface fluorinated using a F2/N2 mixture under 0.1 MPa at 35, 70 or 95 °C for different times. Space charge accumulation was found to show four basic types for each fluorination temperature with increasing fluorination time. But the fluorination times needed for the formation of the…
Abstract Vanadium dioxide (VO2) films were prepared by the sol–gel method on high-purity silicon substrates, in which cetyltrimethyl ammonium bromide (CTAB) was used as a functional additive to form nano-porous structure in the VO2 films. The morphology, crystalline structure and stoichiometry of the films were invest…
The coupling of plasmonic resonances with the multiple phonon modes of a plasmonic supracrystal is studied. Ultrafast optical pump-probe spectroscopy with variable wavelength allows the selective detection of the breathing mode, the interparticle vibrations, and the vibration of the whole structure. Thanks to this sel…
One of the fundamental problems in supramolecular chemistry, as well as in material sciences, is how to control the self-assembly of polymers on the nanometer scale and how to spontaneously organize them towards the macroscopic scale. To overcome this problem, inspired by the self-assembly systems in nature, which fea…
The effect of different Cu addition on the electrochemical and passivation behaviour of the 304 series stainless steel in 0.1 M phosphoric acid solution was evaluated by the potentiodynamic measurements and electrochemical impedance spectrum (EIS). The effect of Cu on chemical composition of the passive film formed in…
A solid-state polymerizable monomer, 2,5-dibromo-3,4-propylenedioxythiophene (DBProDOT), was synthesized at 25 °C to produce a conducting polymer, poly(3,4-propylenedioxythiophene) (PProDOT). Crystallographic studies revealed a short interplane distance between DBProDOT molecules, which was responsible for polymerizat…
The spin thermoelectric properties of a zigzag edged ferromagnetic (FM) graphene nanoribbon are studied theoretically by using the non-equilibrium Green's function method combined with the Landauer-Büttiker formula. By applying a temperature gradient along the ribbon, under closed boundary conditions, there is a spin…
Abstract The interest in applications of atmospheric‐pressure plasmas to solve surface‐technological tasks was originally motivated primarily by the expectation that major cost savings could be achieved if plasma‐based processes, conventionally run below 1 mbar, could now be performed at ambient pressure. However, it…
Non-degradable metals such as stainless steel, cobalt-chromium-based alloys, titanium and its alloys may lead to stress shielding effect after fractured bone has healed. This complication may attribute to the non-degradability and the mismatch of the mechanical properties between these metallic implants and human bone…
The CeO 2 sintering and grain growth kinetics were determined from in situ experiments performed using an environmental scanning electron microscope ( ESEM ) equipped with a hot stage in the temperature range 1000°C–1300°C. Videos were recorded during 8 h at various holding temperatures where the grain growth and grai…
Organic field-effect transistors (OFETs) have attracted attention in the field of organic electronics. The conducting channel of OFETs is highly sensitive to out stimulus, so OFETs can be used as ultrasensitive sensors and actuators. Here, a new kind of OFET containing micro- and nanocrystals of a pentacene analogue i…
In this paper, we present the results of doping nematic liquid crystals (nLCs) with semiconductor quantum dots (QDs) where we discuss the CdS and CdSe QDs influence on the optical properties of investigated liquid crystal structures, i.e., diffraction efficiency enhancement. We also present the mathematical model desc…
A novel fluorescence assay system for glucose was developed with thioglycollic acid (TGA)-capped CdTe quantum dots (QDs) as probes. The luminescence quantum yield of the TGA-capped CdTe QDs was highly sensitive to H2 O2 and pH. In the presence of glucose oxidase, glucose is oxidized to yield, gluconic acid and H2 O2 .…
Understanding materials degradation under intense irradiation is important for the development of next generation nuclear power plants. Here we demonstrate that defect microstructural evolution in molybdenum nanofoils in situ irradiated and observed on a transmission electron microscope can be reproduced with high fid…