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Increased Alignment in Carbon Nanotube Growth

Ames Research Center, Moffett Field, California The combination of electronic and mechanical properties of carbon nanotubes (CNTs) has led to wide-ranging investigation of their potential in future electronics and computing, sensors, electrodes, and composites. A method and system for fabricating an array of two or more CNT structures on a coated substrate surface was developed.

Posted in: Briefs

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Process to Fabricate Specific Sized Monodisperse Polystyrene Microparticles

Langley Research Center, Hampton, Virginia A new method was developed to prepare monodisperse nano to microparticles of polystyrene ranging from 0.5 to 2.5 microns in relatively large-quantity batches (2 L, 10% by weight in water). Current commercial sources are very expensive and can typically only be acquired on a relatively small scale. Monodisperse polystyrene in this size range is an important component of laser velocimetry measurements in wind tunnels, but has many other potential uses. Polystyrene microparticles have uses in paints/coatings, adhesives, bio/immunoassays, reaction catalysts, and chromatography materials. The main benefits of this technology are low cost, scalability, and selectable size.

Posted in: Briefs, TSP

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Atmospheric Pressure Plasma-Based Fabrication of Printable Electronics and Functional Coatings

Applications include biomedical, consumer electronics, security, and communications industries. Ames Research Center, Moffett Field, California The need for low-cost and environmentally friendly processes for fabricating printable electronics and biosensor chips is growing. Nanomaterials have proved to be very useful in both printable electronics due to their electronic properties, and in biosensors for signal transduction, and amplification. Chemical vapor deposition requires high temperatures for the growth of nanostructures, restricting the type and nature of materials that can be used as substrates. Conventional plasma-enhanced chemical vapor deposition requires high vacuum equipment, and the need for vacuum results in additional costs of vacuum pumps and energy resources.

Posted in: Briefs

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Passive Destructive Interference Acoustic Liner for a Turbofan Engine Using Additive Manufacturing

John H. Glenn Research Center, Cleveland, Ohio This technology exploits the capabilities of additive manufacturing to attenuate the fan noise within the inlet or aft duct of a turbofan engine. The approach may be expanded to include auxiliary power units, environmental control systems, or other cooling systems requiring noise attenuation.

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Lunar Cold Trap Contamination by Landing Vehicles

Software and methods are developed to assess the magnitude and distribution of lunar surface contamination caused by the engine exhaust of a landing vehicle. John F. Kennedy Space Center, Florida The emerging interest in lunar mining poses a threat of contamination to pristine craters at the lunar poles, which act as cold traps for water, and may harbor other valuable minerals. Lunar Prospector type missions will be looking for volatile (molecular) compounds that may be masked by the exhaust gases from landing vehicle engines. The possible self-contamination of the landing site could negate the scientific value of the soil samples taken in the vicinity of the landing site. Self-contamination may also lead to false-positive readings of resources available on the lunar surface. This innovation addresses the software and methods needed to assess the magnitude and distribution of lunar surface contamination caused by the engine exhaust of landing vehicles on known or planned descent trajectories.

Posted in: Briefs, TSP

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Fabrication of Single-Mode, Distributed-Feedback, Interband Cascade Lasers

Applications exist in the oil and gas industry, automobile emissions monitors, breath analyzers, and fire detection equipment. NASA’s Jet Propulsion Laboratory, Pasadena, California Type-II interband cascade lasers (ICLs) based on the GaSb material system represent an enabling technology for laser absorption spectroscopy in the 3-to-5-μm wavelength range. Instruments operating in this spectral regime can precisely match strong absorption lines of several gas molecules of interest in atmospheric science and environmental monitoring, specifically methane, ethane, other alkanes, and inorganic gases. Compared with non-semiconductor-based laser technologies, ICLs can be made more compact and power efficient, ultimately leading to more portable, robust, and manufacturable spectroscopy instruments.

Posted in: Briefs, Lasers & Laser Systems, Optics, Photonics

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Developing Ceramic-Like Bulk Metallic Glass Gears

This technology has applications in gears, bearings, and gearboxes for automotive, spacecraft, and robotics. NASA’s Jet Propulsion Laboratory, Pasadena, California This invention describes systems and methods for implementing bulk metallic glass-based (BMG) macroscale gears with high wear resistance. This invention creates bulk metallic glasses (BMGs) with selected mechanical properties that are very similar to ceramics, such as high strength and resistance to wear, but without high melting temperatures. Ceramics are high-strength, hard materials that are typically used for their extremely high melting temperatures. Because of their extreme hardness, ceramics are optimal materials for making gears, due to their low wear loss. Unfortunately, ceramics suffer from low fracture toughness (typically <1 MPa·m1/2), and their high melting temperatures prevent them from being cast into net-shaped parts. Ceramic gears, for example, must be ground to a final shape at great expense.

Posted in: Briefs, Ceramics, Metals

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