Materials Literature
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Abstract Near equilibrium evaporation‐condensation in a sealed ampoule leads to almost full compositional reproduction of a solid solution if it consists of components having comparable vapour pressures; this can be qualitatively interpreted by domination of entropy increase. Nevertheless, even vestigial separation re…
The advantages of thermoelectric energy conversion technologies are briefly summarized. Recent material advances are discussed, with the focus on one-dimensional (1-D) self-assembled molecular materials as building blocks for new thermoelectric materials. The preparation, doping, and thermal characterization of phthal…
We have developed a 22um pitch and 320 × 240 pixel uncooled infrared radiation focal plane array on the silicon-oninsulator (SOI) substrate by means of 0.35um CMOS technology and bulk-micromachining. For IR detection, we use silicon single-crystal series p-n junctions that can realize high uniformity of sensitivity an…
EO/IR Sensors and imagers using nanostructure based materials are being developed for a variety of Defense Applications. In this paper, we will discuss recent modeling effort and the experimental work under way for development of next generation carbon nanostructure based infrared detectors and arrays. We will discuss…
In this paper we present a quick and easy method for producing relatively large areas of nanostructured substrate that enhances the Raman effect. Standard semiconductor processing techniques are used, hence it is possible to narrowly control the parameters of the fabrication process to create free standing silicon nan…
This paper deals mainly with the numerical simulation on edge localized mode (ELM) pacing by pellet injection that is useful for fuelling and control of plasma profiles to achieve enhanced tokamak operations. The fuelling and pellet-induced ELMs are simulated with a 1.5-dimensional core transport code, which includes…
We have studied the effects of degree correlation on congestion pressure in scale-free gradient networks. It is observed that the jamming coefficient J is insensitive to the degree correlation coefficient r for assortative and strongly disassortative scale-free networks, and J markedly decreases with an increase in r…
In this work newly developed 4" GaSb substrates are investigated for their suitability in the epitaxial growth of type II InAs/GaInSb superlattice detectors. The Czochralski technique was used to grow 4" GaSb crystals with etch pit densities in the range of 1.5-2.5E3 cm-2. Bulk crystal structure was investigated by X-…
Utilizing the opposite phase shift property of a microstrip line (MSL) and a pure left-handed transmission line (PLH TL), the broadband Wilkinson balun is designed.The PLH TL without a right-handed (RH) branch is designed using effectively negative elements obtained by a cross connection of vias to ground. The PLH TL…
The plasticity of monoclinic Al13Fe4 particles grown in a spray-formed Al–Fe alloy is examined after being submitted to two deformation modes between 300 and 873 K by specially designed semi-in situ compression tests; one is uniform and the other is by indentation. In the uniform mode, cracks propagate through the Al1…
Past work has discussed infrared absorption using a patterned thin resistive sheet as the frequency-selective absorber for use in wavelength-selective long wave infrared (LWIR) microbolometer focal planes arrays. These patterned resistive sheets are essentially slot antennas formed in a lossy resistive ground plane la…
Tetraethoxysilane (TEOS) was oscillated to accelerate hydrolysis. Hydrolysed TEOS reacted with hexamethydisizane to form hydrophobic sol–gels from which hydrophobic antireflection films were fabricated by spin coating. Enough solvent, such as ethanol, must be added to help the reaction proceed smoothly. Atomic force m…
Paper presented to the 6th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 23, 2010.
Iron-based superconductors, discovered just a few years ago, are members of a diverse family of pnictides and chalcogenides which may potentially contain hundreds of superconducting compounds. The unconventional, multiband superconductivity in these materials most likely emerges from the quintessential magnetic Fe ion…
The current mainstay for short-wave infrared (SWIR) imaging is InGaAs-based focal plane arrays (FPAs). They provide excellent detectivity and low noise, but suffer from high costs, limited spectral response, and the same integration issues that limit array size for most inorganic FPA technologies. RTI has demonstrated…
In developing liposomes for in vivo use, it is important to design the liposomes to have optimal in vivo kinetics, and it is also necessary to identify optimal high-throughput production conditions for these liposomes. Previous work has not definitively established the general relationship between liposomes' configura…
Since Krupke et.al. proposed and demonstrated pumping alkali atoms using diode lasers in 2003, there has been lot of interest in the diode pumped alkali laser (DPAL) systems. Several researchers have been able to scale the DPAL system to powers in the tens of watts. We have conducted a systems-level, weight-scaling st…
Zinc sulphide (ZnS) thin films with nanoscale grains of about 8–113 nm were deposited on glass substrates by chemical bath deposition technique using aqueous solution of zinc acetate [Zn (CH3COO)2] and Thiourea. The structure, surface morphology and optical characteristics of the deposited films were investigated for…
This study investigates the feasibility of a reactively sputtered thin nickel oxide film for application to a microbolometer. The properties of the developed thin nickel oxide film depend on the sputter process parameters. The measured resistivity of the nickel oxide films ranges from 0.3 Ωcm to approximately 50 Ωcm.…
This paper presents an advanced 640 x 480 (VGA) IRFPA based on uncooled microbolometers with a pixel-pitch of 25μm developed by Fraunhofer-IMS. The IRFPA is designed for thermal imaging applications in the LWIR (8 .. 14μm) range with a full-frame frequency of 30 Hz and a high sensitivity with NETD < 100 mK @ f/1. A no…