Materials Literature
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In this work were studied colloids of Ir and Au supported on TiO 2 and Nb2O5 prepared by method of reduction with H2 at high pressure in basic medium. The results indicate that it is necessary a subsequent reduction with H2 to increase the chemisorptions properties and promote the catalytic activity, which is dependen…
In this article, we present a dynamic phase transition and stabilityanalysis for the Cahn-Hilliard equations in cylindrical geometry.Two types of phase transitions (the continuous type and the jump type)are determined explicitly in terms of relevant physical and geometric parameters.
In recent years we have seen a development of novel experimental techniques that enable one to non-destructively characterize polycrystalline microstructures. These techniques hold significant advantages over approaches like serial sectioning since the specimen is not destroyed in the characterization process. This is…
This paper deals with the welding properties of semi-automatic arc welding for hot dip galvanizing rebar to discuss the applicability of hot dip galvanizing steel to concrete rebar. The concrete rebar has many projection points to assure its adhesive property with concrete. The influence of these projections at the fl…
Frontiers Events is a rapidly growing calendar management system dedicated to the scheduling of academic events. This includes announcements and invitations, participant listings and search functionality, abstract handling and publication, related events and post-event exchanges. Whether an organizer or participant, m…
Sub-picosecond nonthermal amorphization of a GeSbTe thin film with femtosecond laser pulse excitation and complete switching of the surface plasmon resonance of a single Au nanoparticle that accompanies an ultrafast phase change were demonstrated.
Particles swarm optimization is a new evolutionary computation technique.Compared with genetic algorithm,the particles swarm optimization has the advantages of easy implement,few control parameters,and fast convergence to optimal solution in most cases.In order to obtain better multilayer coating structure,the particl…
Silicon nitride (Si3N4) offer potential advantages as a substrate for high temperature power packaging. Si3N4 has higher fracture strength than alumina and aluminum nitride. The coefficient of thermal expansion (CTE) of Si3N4 is ~3 ppm/°C and the thermal conductivity ranges from 30–50W/m-K. Active metal brazed Cu-Si3N…
Surface plasmons at metal-dielectric interfaces with graded permittivity are studied. Dispersion relations, field profiles, and losses are derived analytically and numerically. Interface gradation causes anomalous dispersion and increased losses.
The relationship between anelastic property and chemical species (F, OH) in calcium-containing apatite structure was investigated by the dynamic elastic technique. The internal friction and dynamic modulus of two apatite-type ceramics of hydroxylapatite (HAP) and fluoroapatite (FAP) were measured by using a forced tor…
Shape recovery from memory by porous scaffolds for tissue engineering offers easier insertion and self-retention following placement by minimally invasive surgery. Shape memory testing of porous polymer xerogels focuses on the compression cycle and the special aspects of the cycle and equipment used. This contrasts wi…
Two objects made of the exotic materials known as topological insulators could repel one another through the quantum-mechanical forces that cause most other solids to attract, theorists predict.
In this work, we show that quasicrystals exhibit new types of topological phases that were previously attributed only to systems of higher dimension. We experimentally demonstrate such topological effects in 1D systems using photonic quasicrystals.
The ancient silk fibre finds new application as a bio-chemically functional optofluidic material. We demonstrate a silk protein diffraction grating doped with human haemoglobin. The haemoglobin remains chemically active within the grating and responds spectrally to ambient gas concentration. The grating performs a dua…
We report the simple preparation of highly aligned metal nanoparticle arrays comprised of Au nanoparticles 30 nm in diameter and their microscopic analysis. The prepared arrays were a hundred nanometers wide and millimeters long. This technique, which is based on the process of evaporation-induced self-assembly with D…
We measure the temperature of an optically trapped gold nanoshell by tracking its Brownian motion. Single nanoshells are found to heat significantly, and this heating varies with trap wavelength and particle number.
Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2011.
Overhead transmission lines insulators routing near chemical factories are suffering from industrial pollution that are characterized by industrial waste, gases produced from the factories chimneys’ in the form of rain or fog.
The authors had previously theoretically demonstrated that multiferroic nanomagnetic logic can be clocked in ∼1 GHz with few 100 kT/bit power dissipation which is ∼3 orders of magnitude more energy efficient than current CMOS transistor technology that dissipates several 100,000 kT/bit.. In this work, we propose the m…
A structural approach was attempted to estimate rigid ion contributions to pyroelectric coefficients, employing atomic position vectors determined in the least-squares refinement of a polar mineral, cancrinite. The two sets of positions, obtained from the centers of gravity (centroids) and modes of asymmetric probabil…