Manufacturing & Prototyping

Fabrication of Single, Vertically Aligned Carbon Nanotubes in 3D Nanoscale Architectures

Potential applications of this process are integrated circuits, nano switches, and biological sensors.Plasma-enhanced chemical vapor deposition (PECVD) and high-throughput manufacturing techniques for integrating single, aligned carbon nanotubes (CNTs) into novel 3D nanoscale architectures have been developed. First, the PECVD growth technique ensures excellent alignment of the tubes, since the tubes align in the direction of the electric field in the plasma as they are growing. Second, the tubes generated with this technique are all metallic, so their chirality is predetermined, which is important for electronic applications. Third, a wafer-scale manufacturing process was developed that is high-throughput and low-cost, and yet enables the integration of just single, aligned tubes with nanoscale 3D architectures with unprecedented placement accuracy and does not rely on e-beam lithography. Such techniques should lend themselves to the integration of PECVD-grown tubes for applications ranging from interconnects, nanoelectromechanical systems (NEMS), sensors, bioprobes, or other 3D electronic devices.

Posted in: Manufacturing & Prototyping, Briefs

Read More >>

Process To Create High-Fidelity Lunar Dust Simulants

A method was developed to create high-fidelity lunar dust simulants that better match the unique properties of lunar dust than the existing simulants. The new dust simulant is designed to more closely approximate the size, morphology, composition, and other important properties of lunar dust (including the presence of nanophase iron).

Posted in: Manufacturing & Prototyping, Briefs

Read More >>

Producing Hydrogen by Plasma Pyrolysis of Methane

Plasma pyrolysis offers several advantages over traditional catalytic pyrolysis.Plasma pyrolysis of methane has been investigated for utility as a process for producing hydrogen. This process was conceived as a means of recovering hydrogen from methane produced as a byproduct of operation of a life-support system aboard a spacecraft. On Earth, this process, when fully developed, could be a means of producing hydrogen (for use as a fuel) from methane in natural gas.

Posted in: Manufacturing & Prototyping, Briefs

Read More >>

Self-Deployable Membrane Structures

These support structures can be used as portable shelters, camping tents, and thermal insulation.Currently existing approaches for deployment of large, ultra-lightweight gossamer structures in space rely typically upon electromechanical mechanisms and mechanically expandable or inflatable booms for deployment and to maintain them in a fully deployed, operational configuration. These support structures, with the associated deployment mechanisms, launch restraints, inflation systems, and controls, can comprise more than 90 percent of the total mass budget. In addition, they significantly increase the stowage volume, cost, and complexity.

Posted in: Manufacturing & Prototyping, Briefs

Read More >>

Reactivation of a Tin-Oxide-Containing Catalyst

This technique extends the lifetime of a catalyst in a laser discharge.The electrons in electric-discharge CO2 lasers cause dissociation of some CO2 into O2 and CO, and attach themselves to electronegative molecules such as O2, forming negative O2 ions, as well as larger negative ion clusters by collisions with CO or other molecules. The decrease in CO2 concentration due to dissociation into CO and O2 will reduce the average repetitively pulsed or continuous wave laser power, even if no disruptive negative ion instabilities occur. Accordingly, it is the primary object of this invention to extend the lifetime of a catalyst used to combine the CO and O2 products formed in a laser discharge.

Posted in: Manufacturing & Prototyping, Briefs, TSP

Read More >>

Nearly Seamless Vacuum-Insulated Boxes

Elimination of most seams would reduce leakage of heat. A design concept, and a fabrication process that would implement the design concept, have been proposed for nearly seamless vacuum-insulated boxes that could be the main structural components of a variety of controlled-temperature containers, including common household refrigerators and insulating containers for shipping foods. In a typical case, a vacuum-insulated box would be shaped like a rectangular parallelepiped conventional refrigerator box having five fully closed sides and a hinged door on the sixth side. Although it is possible to construct the five-closed-side portion of the box as an assembly of five unitary vacuum-insulated panels, it is not desirable to do so because the relatively high thermal conductances of the seams between the panels would contribute significant amounts of heat leakage, relative to the leakage through the panels themselves. In contrast, the proposal would make it possible to reduce heat leakage by constructing the five-closed-side portion of the box plus the stationary portion (if any) of the sixth side as a single, seamless unit; the only remaining seam would be the edge seal around the door.

Posted in: Manufacturing & Prototyping, Briefs, TSP

Read More >>

Fast-Response-Time Shape-Memory-Effect Foam Actuators

Bulk shape memory alloys, such as Nitinol or CuAlZn, display strong recovery forces undergoing a phase transformation after being strained in their martensitic state. These recovery forces are used for actuation. As the phase transformation is thermally driven, the response time of the actuation can be slow, as the heat must be passively inserted or removed from the alloy.

Posted in: Manufacturing & Prototyping, Briefs, TSP

Read More >>

White Papers

Force and Torque Measurement Traceability
Sponsored by Morehouse
Are you tired of maintaining UPS Systems?
Sponsored by Falcon
The Benefits of Integrated Video Management
Sponsored by Curtiss Wright
OEM Optical System Development
Sponsored by Ocean Optics
How To Guide for the Most Common Measurements
Sponsored by National Instruments
Selection of Materials for Medical Applications
Sponsored by RTP

White Papers Sponsored By: