Materials Literature
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One of the key challenges in current research into electromagnetic cloaking is to achieve invisibility at optical frequencies and over an extended bandwidth. There has been significant progress towards this using the idea of cloaking by sweeping under the carpet of Li and Pendry. Here, we show that we can harness surf…
Abstract Objectives The potential utility of liquid crystalline lipid-based formulations in oral drug delivery is expected to depend critically on their structure formation and stability in gastrointestinal fluids. The phase behaviour of lipid-based liquid crystals formed by phytantriol and glyceryl monooleate, known…
The aim of this study is to improve both thermal and electrical insulation properties of epoxy based composites using nanocomposite techniques. This paper deals with preparation of epoxy composites with high content of micro-filler and those several material characterizations. Types of filler and solvent, methods of m…
2-Pyridone (PD), converting to 2-hydroxypyridine (HP) through a lactam-lactim isomerization mechanism, can form three different cyclic dimers by hydrogen bond formation: (PD)(2), (PD-HP), and (HP)(2). We investigate the complexation chemistry of pyridone in dichloromethane-d(2) using a combined NMR and Fourier transfo…
The lateral rolling of nonstick water and glycerol droplets deposited on solid substrates inclined at the sliding angles was studied. Droplets deposited on lotuslike water-repellent surfaces and liquid marbles (powder-coated droplets) deposited on solid substrates demonstrated similar behavior. The motion of both drop…
A two-level approach has been proposed for describing the plastic deformation under high-rate loading of metals. The characteristics of the motion of dislocations under shear stresses have been investigated at the atomistic level by using the molecular dynamics simulation. The macroscopic motion of a material has been…
The growth of characteristic length scales associated with dynamic heterogeneity in glass-forming liquids is investigated in an extensive computational study of a four-point, time-dependent structure factor defined from spatial correlations of mobility, for a model liquid for system sizes extending up to 351 232 parti…
By direct observation of coherent acoustic phonons, we demonstrate a novel extrinsic piezoelectric response in colloidal CdSe semiconductor quantum dots. This response is driven by the migration of charges to the surface of the quantum dot on a vibrationally impulsive time scale. Surface- and fluence-dependent studies…
The dynamics of polarization switching in a soft lead-zirconate-titanate ceramic has been studied over a broad time window ranging from 10−6–106 for applied fields between 0.5 and 2.5 kV/mm. The classical Kolmogorov–Avrami–Ishibashi model of the polarization reversal was not able to satisfactory explain the obtained r…
Hyper-Rayleigh scattering experiments and ab initio calculations are combined to investigate the solvent effects on the second-order nonlinear optical responses of a 2-hydroxy-1-naphthaldehyde derivative that commutes between an enol and a keto form. Different binary mixtures of cyclohexane and ethanol are used to dis…
Acoustic bubble sizes, coalescence behavior, and sonochemical activity have been investigated in water in the presence of various electrolyte additives (KCl, HCl, and NaNO(3)) and saturating gases-helium, air, and argon. A strong correlation was identified between the bubble radius and the dissolved gas concentration…
We have studied the effect of substrate roughness on the wettability and the apparent surface free energy (SFE) of sputter deposited polytetrafluoroethylene (PTFE) coatings deposited on untreated glass (average roughness, Ra=2.0 nm), plasma etched glass (Ra=7.4 nm), and sandblasted glass (Ra=4500 nm) substrates. The w…
The determination of the energy spectra of small spin systems as for instance given by magnetic molecules is a demanding numerical problem. In this work we review numerical approaches to diagonalize the Heisenberg Hamiltonian that employ symmetries; in particular we focus on the spin-rotational symmetry SU(2) in combi…
The dominant factors that accelerate the degradation of insulation in equipment incorporating power electronics are discussed. The conclusions will assist in the search for improved insulation design and reliability.
We report an acoustic surface plasmon mode on the Au(111) surface, which disperses into the visible region, as measured by high resolution electron energy loss spectroscopy. The new mode is assigned to an acoustic surface plasmon arising from the Shockley-type surface state electrons and coexists with the conventional…
Problem statement: In this study, attempts had been made to synthesize silver (Ag)/Poly Vinylpyrolidone (PVP) nanoparticles by ionizing radiation and at the same time overcoming some of the disadvantages previously reported by other methods such as impurities, solvent toxicity, size and distribution control and diffic…
The spinel (Co 3 O 4 ) and the perovskite (LaCoO 3 ) oxides are two distinct structures that have in common the trivalent cobalt cations in the octahedral sublattice but in contrasting interconnection geometries. Several properties are directly related to these octahedra, which are edge-connected in the spinel and ver…
This paper shows the result of a failure survey including the entire population of gas-insulated substations in the Norwegian power transmission system. The survey comprises the complete service experience up to now-nearly 12000 circuit-breaker years. Information about 180 failures has been recorded during 36 years: 7…
As reports on the safety of various nanomaterials have yielded conflicting results, assessment of the reliability of each study is required to objectively interpret overall safety of the nanomaterial. A 2-step method to assess the quality of nanotoxicity studies is described. The first step uses a publicly available t…
Ferrite nanoparticles with a composition of Ni0.5Zn0.3Co0.2Fe2O4 were prepared by a coprecipitation method. The sample obtained after treating at appropriating conditions had almost equal real permeability and permittivity, of 4.8+j0.15 (loss tangent∼0.04) and 4.9+j0.10 (loss tangent∼0.018), respectively, over 100 to…