Materials Literature
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We present detailed studies of the relationship between ionic conductivity and segmental relaxation in polymer electrolytes. The analysis shows that the ionic conductivity can be decoupled from segmental dynamics and the strength of the decoupling correlates with the fragility but not with the glass transition tempera…
We show that light drives large-amplitude structural changes in thin films of the prototypical ferroelectric PbTiO3 via direct coupling to its intrinsic photovoltaic response. Using time-resolved x-ray scattering to visualize atomic displacements on femtosecond time scales, photoinduced changes in the unit-cell tetrag…
Most glass-forming systems are composed of basic units interacting with each other with a nontrivial anharmonic potential. Naturally, relaxation and diffusion in glass formers is a many-body problem. Results from recent experimental studies are presented to show the effects of many-body relaxation and diffusion manife…
The synthesis of high-purity bulk nanostructured cubic boron nitride (cBN) at 20 GPa and 1770 K by direct phase transformation of graphite-like BN with an "ideal random layer" structure is reported. The two-times increase of hardness of nano-cBN (H(V) = 85 GPa) with respect to conventional polycrystalline cBN (H(V) ∼…
Upconversion is an optical process that involves the conversion of lower-energy photons into higher-energy photons. It has been extensively studied since mid-1960s and widely applied in optical devices. Over the past decade, high-quality rare earth-doped upconversion nanoparticles have been successfully synthesized wi…
One of the major open challenges in structural biology is to achieve effective descriptions of disordered states of proteins. This problem is difficult because these states are conformationally highly heterogeneous and cannot be represented as single structures, and therefore it is necessary to characterize their conf…
Carbon nanotubes have shown promise as regulators of seed germination and plant growth. Here, we demonstrate that multiwalled carbon nanotubes (MWCNTs) have the ability to enhance the growth of tobacco cell culture (55-64% increase over control) in a wide range of concentrations (5-500 μg/mL). Activated carbon (AC) st…
The A-site-ordered perovskite-structure oxides AA′3B4O12 are attracting much interest due to their large variety of physical properties. When the B-site ions in AA′3B4O12 are nonmagnetic species, one can see very unusual magnetic behaviors of spins in the A- and A′-site sublattices. In their Feature Article on pp. 423…
Different types of reversed phase (RP) columns have been incorporated for the separation of gamma radiolytic degradation products (DPs) of methoxychlor. The effect of carbon chain length, carbon content, surface area, pore size, pore volume, and column dimensions of RP columns on DPs separation has also been investiga…
This Gem is one in a series of occasional Ada quizzes exploring various features of the language, extracted from the AdaCore training courses. (For more information about our courses, visit http://www.adacore.com/home/products/gnatpro/professional_services/training/.)
Recent research on Ln2O3-type oxide nanomaterials provide challenges to both fundamental and breakthrough development of technologies in various areas such as electronics, photonics, display, lasing, detection, optical amplification, fluorescent sensing in biomedical engineering and environmental control. Gadolinium o…
We use our recently proposed accelerated dynamics algorithm (Tiwary & van de Walle, 2011) to calculate temperature and stress dependence of activation free energy for surface nucleation of dislocations in pristine Gold nanopillars under realistic loads. While maintaining fully atomistic resolution, we achieve the frac…
Room temperature DC conductivity of embedded Cu nanoparticle is metallic and voltage independent for Cu concentration above 55% and below this transition concentration I verses V is nonlinear and for perculative sample varies as Vs. AC conductivity for the whole range of concentration can be explained by the impedance…
In the tropical developing countries, diseases such as diabetes, tuberculosis, cancer, obesity have been a continuous cause of mortality. In recent times, nutrition experts have come up with new ideas for food recipe, with a view to improving human health. One of these ideas is to enhance dietary fibre content to impr…
Advances in Nanotechnology and the Environment, edited by Juyoung Kim, Singapore, Pan Stanford, 2012, 224 pp., $149.95 (hardback), ISBN 978-9-814-24155-7. Scope: review. Level: researcher, speciali...
The considerable contamination of the aqueous environment by organic pollutants still requires the development of effective adsorbents these compounds. The current work reports the applicability of mesoporous aluminosilica monoliths with three-dimensional structures and aluminum contents with 19 ≤ Si/Al ≥ 1 as effecti…
Plastic Optical Fiber with Excellent Heat-Resistant Property, Selected Topics on Optical Fiber Technology, Dr Moh.Yasin (Ed.),
Green synthesis of silver and gold nanoparticles as two metal nanoparticles, was studied based on photoreduction of metal ions using molybdophosphoric acid (H3[PMo12O40], HPMo) under UV-irradiation. HPMo was found to be photocatalyst, reducing agent and efficient stabilizer for the resulting nanoparticles. This method…
This chapter contains sections titled: Introduction Materials and Methods Results and Discussion Acknowledgments References
Among nuclear materials used in both research and commercial power reactors, very highdensity dispersion fuels have been used for requirement of a large proportion of uranium per unit volume in order to compensate to the reduction of enrichment (Meyer et al., 2002, Kim et al., 1999, 2002). For examples, uranium (U) wi…