Materials Literature
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Ammonia (NH3) is one of the most widely produced chemicals worldwide. It has application in the production of many important chemicals, particularly fertilizers. It is also, potentially, an important energy storage intermediate and clean energy carrier. Ammonia production, however, mostly uses fossil fuels and current…
Two new steroidal glycosides ponasteroside C (1) and ponasteroside D (2) were isolated from the aerial parts of Lepidogrammitis drymoglossoides. Their structures were elucidated by various spectroscopic techniques (IR, HRESIMS, 1D and 2D NMR). All compounds were evaluated for their cytotoxicity against HeLa and HCT-8…
In the present study, polypropylene/nanoclay (PP/NC) and polypropylene/nano-calcium carbonate (PP/CC) nanocomposites with different weight percentages of filler were prepared using a twin-screw extruder. The effects of nanoparticles content on the nanocomposite were studied using the hardness measured under the applie…
Abstract In the paper, the influence of shape memory alloy (SMA) by varying the parameters such as volume fraction, orientation, and temperature on the hybrid-SMA composite laminate subjected to low-velocity impact is studied. A theoretical model for the composite laminated plate bonded with SMA reinforced layers is p…
In all-optical pump-probe experiments on ferromagnetic layers, the determination of the temperature under the pump laser spot is crucial for a quantitative modeling of the magnetization dynamics. We present here a method to quantify this thermal gradient, exemplified on a (Ga, Mn)(As, P) ferromagnetic semiconductor la…
In this study, UV absorption, fluorescence and electro-optical study have been performed for pure ferroelectric liquid crystal (FLC) and its three different concentrations, i.e. 1%, 3% and 5% of fluorescent polymer in the pure FLC. We observed that there is higher value of UV absorption for fluorescent polymer-doped s…
Polyamidoamine dendrimers (PAMAM) belong to a relatively new class of polymers that are evaluated as efficient systems for drug delivery due to their nanosize range, ability to improve solubility, permeability and pharmacological activity of many drugs. In this study, the influence of PAMAM dendrimers of generation2 (…
Thermal stability as well as enhanced mechanical properties of poly-lactide (PLA) can increase PLA applications for short-use products. The conjunction of adequate molecular weight (MW) as well as satisfactory thermo-mechanical properties, together, can lead to the achievement of suitable properties. However, PLA is s…
In vertebrates, insufficient availability of calcium and inorganic phosphate ions in extracellular fluids leads to loss of bone density and neuronal hyper-excitability. To counteract this problem, calcium ions are usually present at high concentrations throughout bodily fluids-at concentrations exceeding the saturatio…
In this paper, we discuss broadband dielectric spectroscopy from mHz up to the infrared range mainly for materials with inhomogeneous weak conductivity, including conductor-dielectric nanocomposites. Our discussion is based on the effective medium approximation (EMA) and experiments modeled by this approach are review…
The strain rate sensitivity (SRS) of Mg-1.5 wt% Gd processed by conventional extrusion and 2 passes of simple shear extrusion (SSE) was investigated by shear punch testing. Shear punch tests were conducted at initial shear strain rates in the range of 0.003-0.3 s -1 and at temperatures in the range of 573-773 K. A fin…
Objective: The objective of the following study was a synthesis of nanocrystalline tetragonal zirconia (ZrO 2 ) using simple sol–gel method and evaluation of its structural and biological properties. Methods: The sample was characterized by X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (F…
The paper addresses the issues of alkoxide method of sol-gel synthesis and non-hydrolytic method of sol-gel synthesis and colloidal method of sol-gel synthesis. The authors also consider an alternative approach based on the use of soluble silicates as precursors in the sol-gel technology, of nanocomposites. It was sho…
Abstract Chitosan–cobalt(II) complex (CTS–Co) was prepared by the complexation of chitosan with cobalt(II) ions. Fourier transform infrared spectra showed that the amine and secondary –OH groups of chitosan were involved in the complexation with Co(II) ions. The resultant CTS–Co exhibited slightly lower thermal stabil…
Silver nanostructured films suitable for use as surface-enhanced Raman scattering (SERS) substrates are prepared in just 2 hours by the solid-state ionics method. By changing the intensity of the external direct current, we can readily control the surface morphology and growth rate of the silver nanostructured films.…
Environmental issues have led to new research into the development of eco-friendly materials. For building materials, plant fibre reinforced matrix is one of the rising innovative solutions. In this paper, the benefits of reinforcing a pozzolanic matrix with flax and hemp fibres and the impact of time and environmenta…
Abstract Thermogravimetric analysis (TGA) is an analytical technique in which changes in physical and chemical properties of materials are measured as a function of temperature and/or time. TGA is commonly used to determine selected characteristics of materials that exhibit either mass loss, or gain, because of decomp…
In this paper, the size-dependent resonant behavior of a microcantilever immersed in an incompressible fluid cavity is investigated. The nonclassical modified couple stress theory (MCST) is employed to capture the effects of length scale. The microbeam is deflected by applying a bias direct current (DC) voltage and th…
We report the structure of an aluminum borohydride ethylenediamine complex, Al(EDA) 3 ·3BH 4 ·EDA. This structure was successfully determined using X-ray powder diffraction and was supported by first-principles calculations. The complex can be described as a mononuclear complex exhibiting three-dimensional supramolecu…
Inversion layer technique can increase the centre frequency ( f 0 ) and the −6 dB bandwidth of the ultrasound transducer without reducing thickness of active material. However, it suffers from the reduced −6 dB bandwidth when the centre frequency is increased more than 1.5 f 0 . A modified inversion technique is propo…