Materials Literature
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The density of vibrational states in amorphous materials is known to present an unusual shape related as "boson peak", and responsible for the very specific thermal behaviour of these systems. In this letter, we show how the vibrational modes of a model Lennard-Jones glass are affected by a mechanical load. Far from a…
Large scale production of graphene nanosheets was achieved by arc evaporation of a graphite rod in air. The graphene nanosheets are approximately 100-200 nm wide and the number of layers is mainly in the range of 2-10. Several tens of grams of product were obtained per day. The yield of graphene nanosheets was found t…
This paper presents investigations on the performance of 33 kV silicone rubber insulators characterized by different creepage lengths, which aimed to find out whether the insulators could permanently work when electrically stressed beyond the recommended limits in polluted and clean tropical environments. The study wa…
In the first part, some fundamental issues that have been under discussion for a long time will be revisited, namely the effect of the cyclic slip mode on the fatigue-induced dislocation distributions, the origin and effect of cyclic slip irreversibilities and their relation to fatigue life and, finally, cyclic strain…
This paper reports on the result of rheological modelling of plaster deposition for paintings restoration. A typical plaster recipe was changed in order to check the effect of water level on rheological properties, both performing oscillatory tests and measuring plaster viscosity at two different temperatures. A model…
We propose a viscosity model accounting for experiments of emulsions of two immiscible liquids at arbitrary volume fractions. The model is based on a recursive-differential method formulated in terms of the appropriate scaling variable which emerges from an analysis of excluded volume effects in the system. This varia…
Surface rheological properties affect the dynamics of vesicles, nanoparticles, emulsion droplets, foam bubbles, polymer microcapsules, liquid jets, living cells, lung avioli, thin liquid films, and many other multiphase systems. Surface rheology is therefore relevant for a wide range of disciplines in the areas of phy…
A new pressure cell is described to measure the flow behaviour of polymer melts in dependence of temperature and pressure. Special attention is laid on the construction and functionality of the pressure cell. The pressure cell can be pressurized up to 120 bar and is heatable up to 260ºC. As a measuring geometry a plat…
In this paper, we provide a general Fourier transform formalism suitable for studying the electromagnetic response of material media. This approach can handle media that exhibit natural optical activity, magnetoelectric effects, spatial dispersion, etc. Moreover, it is a powerful method in addressing the impact of ele…
Abstract The assembly of multifunctional nanocomposite materials is demonstrated by exploiting the molecular sieving property of SBA‐16 nanoporous silica and using it as a template material. The cages of the pore networks are used to host iron oxide magnetic nanoparticles, leaving a pore volume of 0.29 cm 3 g −1 acces…
This work presents numerical simulations of indentation at different scales. The indentation test is chosen to illustrate the multiscale approach used in most modern studies of crystalline plasticity. The multiscale approach proposed in this work consists of passing information from one model up to another model opera…
We report in this paper studies on a mixture of nematic liquid crystal (5CB) and BaTiO3 ferroelectric nanoparticles (NPs). Apart a drastic change in the electro-optical (EO) properties of this mixture, which is reported as a conclusion, we focused our attention onto the characteristics of those NPs. The initial powder…
The nanostructure of mesophase liquid crystals prepared from amphiphilic lipids controls the rate of release of incorporated agents from the material, such as drug molecules, and reversible transition between different nanostructures essentially provides an "on-off" switch for release (Fong, W.-K.; Hanley, T.; Boyd, B…
Flashover of contaminated insulators in polluted areas is one of the most important factors influencing the operation of transmission and distribution lines and substations. Hence predicting an approaching flashover is of a great importance. In this paper, a new method and criteria have been proposed to predict the fl…
In this study, free vibration analysis of carbon nanotubes is investigated based on Timoshenko beam theory. Discrete singular convolution (DSC) method is used for free vibration problem of numerical solution of carbon nanotubes. Numerical results are presented and compared with that available in the literature. It is…
In this work, the evolution of the optical properties of nanoscale spatially indirect excitons as a function of the size, shape, and composition of the heteronanostructure is investigated, using colloidal CdTe/CdSe heteronanocrystals (2.6 nm diameter CdTe core and increasing CdSe volume fraction) as a model system. Em…
This paper deals with the experimental studies on the erosion resistance of low weight % alumina-filled nanocomposites and highly filled microcomposites. Erosion resistances of 2.5 % and 4 % by weight alumina-filled silicone rubber nanocomposites and 5 %, 10 %, 15 %, 20 % and 30 % by weight ATH filled microcomposites…
The electronic interactions of several organic donor/acceptor molecules or combination of these molecules (hereafter known as ``charge-transfer complexes'') with graphene have been investigated by first-principles calculations and photoemission spectroscopy experiments. It is found that the doping behavior of graphene…