In this video, we demonstrate the process that we use for braiding carbon nanotube fibers to make EMI shielding braids or braided CNT yarns. These braids are lightweight and highly flexible. They are also more conductive than stainless steel fiber braids and much stronger than copper wire.
This video shows how carbon nanotube (CNT) fibers can be assembled into yarns or ropes by plying the fibers together with a planetary ropemaking machine. These yarns are lightweight and highly flexible. They are also more conductive than stainless steel thread and much stronger than copper wire.
This video highlights the high temperature stability of CNT yarns compared to stainless steel thread by applying a 1430 C butane torch to both materials. The stainless steel thread barely lasts 1 second before melting, while the CNT yarn survives the torch for more than 30 seconds without any visible damage. The high thermal stability and superior thermal conductivity of the CNT material is most likely the reason that it is able to survive exposure to the flame from the torch. The impressive thermal properties of CNT fibers and films make them highly promising for application in flame retardant materials such as those used in firefighter suits.
Source: Original article appears in the December 2018 issue of the Wire Journal International.
The feature on DexMat is on pages 48-50.
In this video we explain how DexMat’s carbon nanotube (CNT) tape has been used to replace the two EMI copper shielding braids typically used in RG316 cables. The performance of DexMat prototypes matches standard RG316 performance, while reducing the total weight of the cable by 50%!
The shielding effectiveness and insertion loss results for the CNT and Cu shielded cables are shown below. The CNT tape shielded cables have the following advantages:
- Overall RG-316 cable weight reduction of CNT shielded vs. Cu double braid shielded cable without connectors is over 50%
- CNT tape shield is 100 microns thick compared to 500 micron thick Cu double braid shield
- Easy to apply CNT tape to coaxial as well as twisted pair type cables
- Wide range of CNT tape widths and lengths are available for purchase
- CNT tape shielded cables survive at least 1000 flex cycles with a minimum bend radius of at least 7.5X the jacketed cable diameter
Specification Sheet: DexMat fiber, tape, and cable specs Dec-2018
November 28, 2018. Out of the original 17 semi-finalists, DexMat was selected as one of 5 finalists to pitch at the 2018 SpaceCom Entrepreneur Summit in Houston, TX, for the opportunity to win the $100,000 Entrepreneur Challenge. As a runner-up, DexMat won $20,000 in Google Cloud Credits.
HOUSTON – SpaceCom – The Space Commerce Conference and Exposition, where NASA, aerospace and industry come together to connect, announces the finalists of the SpaceCom Entrepreneur Challenge. Taking place at the George R. Brown Convention Center in Houston November 27-28, this challenge is the culmination of the SpaceCom Entrepreneur Summit (SES). The Entrepreneur Challenge began with 56 startup applicants. Through the first round of judging, that number was narrowed to 23 and now 17 semi-finalists who will present during the first day of the SpaceCom Entrepreneur Summit, Tuesday, November 27.
The semi-finalists include:
- Benchmark Space Systems
- Cemvita Factory Inc.
- Devali Inc
- DexMat, Inc.
- EXOS Aerospace Systems & Technologies
- Finsophy Inc.
- Hedy-Anthiel Space Systems
- Lazarus 3D Inc.,
- Lucid Drone Technologies, Inc.
- LunaSonde, LLC
- Molon Labe LLC
- SaraniaSat Inc.,
- Solstar Space Company
- STARK Industries LLC
- Sugarhouse Aerospace
- Swift Data LLC
At the culmination of day one, five finalists will be selected to present during a pitch competition. The winner will then be selected after the final round of pitches during the general session November 28 at 1:30 PM. During this presentation, members of the audience and a panel of judges will select the grand prize winner. These finalists are eligible to win the below prizes provided by Google Cloud for Startups:
- $100,000 in Google Cloud credits to the competition winner
- $20,000 in Google Cloud credits for runners up
- $3,000 in Google Cloud credits for every qualified entrant in the competition
Additional prizes include:
- Guaranteed extended meeting with an investment firm
- Speaking role at SpaceCom 2019
- A booth at SpaceCom 2019
This video highlights the high temperature stability of CNT yarns compared to copper wire by applying a 1430 C butane torch to both materials. The copper wire lasts about 5 seconds before melting, while the CNT yarn survives the torch for more than 30 seconds without any visible damage. The high thermal stability and superior thermal conductivity of the CNT material is most likely the reason that it is able to survive exposure to the flame from the torch. The impressive thermal properties of CNT fibers and films make them highly promising for application in flame retardant materials such as those used in firefighter suits.
Source: Original article appears in the October 2018 issue of the Wire Journal International.
Free subscription is required to read the digital version of the article. The feature on DexMat is on pages 52-53.
Abstract: The above video demonstrates how carbon nanotube fibers are integrated into a spacesuit to help spacesuits mitigate dust contamination for future lunar and Mars missions.The spacesuit fabrication and testing was performed by researchers from the University of North Dakota, Boeing, and the NASA Glenn Research Center. CNT fibers were produced by DexMat.
Spacesuit dust mitigation has been a topic of high relevance and a critical path for future planetary exploration missions including Moon, Mars and Asteroids. A previous study demonstrated utilizing Carbon Nanotube (CNT) yarns as electrodes embedded into coupons made of spacesuit outer-layer material. When a multiphase Alternating Current (AC) voltage signal was applied to this material, the spacesuit fabric repelled greater than 80% lunar dust simulant with particle sizes between 10-75m in ambient conditions. As a continuation to this study, the feasibility of scaling the CNT embedded dust removal system on larger portions of spacesuit is investigated. A scaled prototype, representative of the knee joint section of a planetary spacesuit utilizing specifics of the NDX-2 lunar spacesuit developed by University of North Dakota was constructed. The outer-layer of this prototype is embedded with the CNT dust removal system and tested under various conditions. Fabrication of this system and results from the experiments using lunar dust simulant are detailed in this paper.