Materials Literature
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Calotropis (Asclepiadaceae) commonly known as “madar” is a useful medicinal plant. The two species i.e. Calotropis gigantea and Calotropis procera are to a great extent having a very similar chemical properties, but the colours of their flowers are different. The pH of latex of these two species has been found differe…
We report the synthesis of copper oxide ( CuO ) nanoparticles prepared by wet chemical precipitation method. The structural and dielectric properties are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and complex impedance spectroscopy as a function of fr…
Exclusive synthesis and characterisation of new dinitrohexa(alkoxy)triphenylene compounds were carried out. Nitration of 2,3,6,7,10,11-hexa(alkoxy)triphenylene with fuming nitric acid yielded 2,3,6,7,10,11-hexa(alkoxy)-1,5-dinitrotriphenylene with regioisomer 2,3,6,7,10,11-hexa(alkoxy)-1,8-dinitrotriphenylene and that…
We present the first report on a large low-temperature magnetoresistance (MR) of more than 1600% in a SrFe 2 As 2 single crystal and 1300% in a low-energy Ca ion-implanted SrFe 2 As 2 single crystal that occurs before the emergence of crystallographic strain-induced bulk superconductivity arising from a sample aging e…
Hybrid films of siloxane-poly(methyl methacrylate) (PMMA) are used as coatings in materials such as galvanized steel and alloys and have also recently been used as bulk materials. To improve the performance of these films, new formulations have been developed with the introduction of plasticizer agents to improve zinc…
Abstract In this work, transformation behaviors and mechanical properties of cold‐rolled shape memory alloy Ti 50 Ni 49 Fe 1 by severe plastic deformation (SPD) were intensively investigated. The phase transformation behaviors, phase analysis, and microstructures were characterized by differential scanning calorimetry…
Freshwater red algae are rarely documented in Italy, although their presence is quite common in European watercourses. The few data available about this algal group are reported in broader studies concerning algal flora of Italian rivers. This paper is aimed to broaden the knowledge on red algae in Italian running wat…
Based on dynamic equations of a heterogeneous elastic medium which take into account rotational degrees of freedom of microstructure particles, a simplified mathematical model was constructed to describe the wave motions of a nematic liquid crystal under weak mechanical and temperature perturbations. It is shown that…
In this study, polypropylene (PP)/sisal fibre (SF)/carboxyl terminated hyperbranched polymer (CTHP) composites were prepared by using short SF as the reinforcement, PP as the matrix and CTHP as a compatiliser. The impact fracture surface of PP/SF composites and the interfacial compatibility between PP and SF were anal…
One of the most common processes used in manufacturing of multilayer ceramic packages, multilayer capacitors and large scale integration circuits is tape casting. In this process, the wet tape thickness is one of the single most determining parameters affecting the final properties of the product, and it is therefore…
This paper presents an experimental study of Partial Discharges and light emission with ceramic substrates embedded in silicone oil, under ac and square high voltage. Two types of ceramic materials used in power electronics modules are considered: Aluminum Nitrite (AlN) and Alumina (Al2O3). With AlN, a large light emi…
A novel test method for the condition assessment of dielectric fluids is proposed based on measurement of the fluid's partial discharge (PD) characteristics in a needle-plane electrode geometry under AC field using a tungsten needle of 20 μm tip radius and a lowfield electrode blocked by a dielectric barrier. This sys…
Nowadays, metal nanoparticles have attracted a great scientific interest due to their unique optoelectronic and physicochemical properties with applications in diverse areas such as molecular diagnostics and drug delivery, electronics, catalysis or sensing. The development of techniques for the controlled synthesis of…
In the Editor's Choice article of this issue (pp. 2091–2101), Adisak Boonchun and Walter R. L. Lambrecht give an overview of the current understanding of two important defects in ZnO: the oxygen vacancy and nitrogen impurities. While nitrogen substituting on the oxygen site is known to give rise to a deep level unsuit…
Abstract New multifunctional, degradable, polymeric biomaterial systems would provide versatile platforms to address cell and tissue needs in both in vitro and in vivo environments. While protein‐based composites or alloys are the building blocks of biological organisms, similar systems have not been largely exploited…
Hybrid gold nanoparticles modified with poly( N ‐isopropylacrylamide)‐ block ‐poly(2‐succinyloxyethyl methacrylate) (PNIPAM‐ b ‐PSEMA) brushes are synthesized using surface‐initiated atom transfer radical polymerization (SI‐ATRP). The “hairy” particles demonstrate reversible pH‐ and temperature‐controlled changes in s…
The generation of defects as a phenomenon of structure self-organization under the action of an external energy flux was investigated on an example of compression of a solid nanostructure. It is shown that there exists a critical energy flux at which the system experiences an avalanche change both in the time- and loa…
Recent studies have suggested that silver nanoparticles (AgNPs) may affect cell DNA structure in in vitro conditions. In this paper, we present the results indicating that AgNPs change nuclear complexity properties in isolated human epithelial buccal cells in a time-dependent manner. Epithelial buccal cells were plate…
The main features of thermoluminescence (TL) of nanostructured ceramics based on anion-defective aluminum oxide have been investigated. The kinetic parameters of the TL dosimetric peak at 475 K have been determined. The possibility of using nanostructured ceramics for beta-radiation dosimetry of high doses (up to 1 kG…
Summary Various foaming routes were used in order to produce poly(methyl methacrylate) porous structures. The focus was, primarily, on the temperature‐induced phase separation method and the effect of foaming temperature was, first, investigated. It was observed that the pore size decreases with increase of foaming te…