00:39:57 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: LSIC Confluence: https://lsic-wiki.jhuapl.edu/ LSIC Confluence access: lsic-wiki-admins@listserv.jhuapl.edu DM Confluence Page: https://lsic-wiki.jhuapl.edu/display/DM Current Facilities List: https://lsic-wiki.jhuapl.edu/display/CD/Facilities+Directory+Home DM Who's Who: https://lsic-wiki.jhuapl.edu/display/DM/Who%27s+Who+In+Dust+Mitigation Today's Meeting: https://lsic-wiki.jhuapl.edu/display/DM/2023+08+17+Bristle+Cleaning+and+EDS+Applications 00:40:15 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: LSIC Website: https://lsic.jhuapl.edu/ Sign up for LSIC: https://lsic.jhuapl.edu/News/Sign-Up.php 00:41:12 Tim Cole: DM Confluence Page: https://lsic-wiki.jhuapl.edu/display/DM 00:41:48 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: Human Lander Challenge (HuLC): https://hulc.nianet.org/challenge_details/ 00:41:57 Wesley Fuhrman (he/him): Potentially of interest to commercial folks: https://www.darpa.mil/news-events/2023-08-15 00:42:19 Wesley Fuhrman (he/him): DARPA released a call on Tuesday for commercial lunar architecture development 00:42:31 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: TechPort: https://techport.nasa.gov/opportunities 00:43:24 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: Autonomy Workshop: https://lsic.jhuapl.edu/Events/Agenda/index.php?id=474 00:44:16 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: LSIC Fall Meeting 2023: https://lsic.jhuapl.edu/Events/Agenda/index.php?id=464 00:45:04 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: DM & EE Workshop: https://lsic.jhuapl.edu/Events/Agenda/index.php?id=481 00:45:24 Julie Linsey: The Path to Sustainable Tech is also Tuesday Nove 7th? 00:46:45 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: @Julie Linsey - Correct - Path to Sustainable Technologies in the Lunar Surface Environment is held virtually on Tuesday, November 7, 2023 00:46:56 Julie Linsey: same time as DM & EE Joint? 00:47:04 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: Same workshop! 00:47:09 Julie Linsey: I see 00:48:09 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: White Paper: https://lsic.jhuapl.edu/Resources/files/The%20Path%20to%20an%20Enduring%20Lunar%20Presence.pdf Please send feedback to: LSIC-Feedback@jhuapl.edu 00:53:50 Lindsey Tolis: Please feel free to put questions for our speakers here and we will do Q&A at the end of the presentations. 00:54:08 Tara Vega (Blue Origin): how small are the gaps between peaks in the material? 00:54:50 Chih-Hao Chang: We are working with periods down to 400 nm at the moment 00:55:09 Tara Vega (Blue Origin): 👍 00:57:45 Ryan Kobrick, PhD: Looking good! Can someone post the links in the chat to find these papers after? 00:58:26 Chih-Hao Chang: Thank you for your interest the paper can be found here: https://pubs.acs.org/doi/abs/10.1021/acsami.2c19211 00:59:10 jacob: Did you check the adhesion to patterned surfaces in vacuum? 01:00:24 Zelina Iskanderova: from our work with 3 Lunar dust vacuum simulators - - the community NEEDS to pay special attention to the way of HOW TO CHECK the mitigation effect IN VACUUM - Lunar dust vacuum simulator - well defined dust source(!) and method of registration of the final effect! - Zelina Iskanderova 01:00:24 Ekaterina Seltikova: What kind of surfaces are priority for you? Do you consider applying your tech to spacesuits? 01:00:43 Alexander Lüking -FibreCoat-: If I understood correctly, you are using Polyurethan having a working temperature of max. 120 °C? If so, how have you modified it to withstand the high temperatures on Moon >120 °C? 01:02:18 Chih-Hao Chang: In phase 1 we did a quick test in a vacuum desiccator and noticed similar mitigation effect (also reported in the paper). For phase 2 we are currently installing a vacuum chamber to perform more experiments 01:02:41 Bill Kemp: Has this material been tested in temperatures similar to permanently shadowed craters? 01:03:00 Tara Vega (Blue Origin): Would UV radiation have a negative effect over time? 01:03:41 Rosemary Killen: How much does this material degas in the lunar environment, and how is it degraded by solar energetic particles? 01:06:57 Dan Hawk: How does the material adhere in extreme low temperatures. Like in the shadowed lunar areas? From hot-cold over time such as from Sun-shadow-Sun-shadow. Concerned about adhering capability. Dan 01:07:00 Chih-Hao Chang: Great question regarding temperature and UV radiation. We have not performed tests on the dependencies of the mitigation effects on them, but we have plans to do so for phase 2. We custom designed a vacuum chamber that will have temperature, UV radiation, vacuum, etc. control, as well as another glove box to examine humidity 01:07:03 Zelina Iskanderova: Can you send us, ITL Inc, Canada, some samples to check the performance in the advanced vacuum Simulator we are working with now?! 01:07:18 Meghan Bush: Do you have spectrophotometer data for any of these patterns to see how they interact with light? 01:09:33 Chih-Hao Chang: Great question on the interaction of the structure with light. Depending on the incident angle, the structure diffracts light in the visible, which results in the rainbow appearance. The structure also exhibits some antireflection effects 01:09:57 Jason R. Stockton: Do you have any thoughts on handling/durability characteristics of impreted materials? In other words: If a crewmember were to bump or press something that has been imprinted, will that action damage the imprinting? 01:10:39 Nichole Scott (SMS): @Alexander Luken: We are working primarily with polycarbonate, not polyurethane. However, we've done some work with other higher-temperature materials like polyimide, so we are pretty confident we can meet most temperature requirements. 01:11:25 Dan Hawk: I can add charge to a sample. Dan 01:11:36 Alexander Lüking -FibreCoat-: Thanks Nichole, I got it wrong then. 01:11:47 Jason R. Stockton: Add static charge question: Maybe, please reach out via email: jason.r.stockton@nasa.gov 01:11:52 Francis Davies: Laser printers reliably apply static charge to internal surfaces as part of printing. 01:12:17 Micah Schaible: You can expose a surface to thermal electrons or use vibration to add charge to grain surfaces. 01:12:30 jacob: We can reduce static charge by using a surface modification process that provides charge-dissipative properties. 01:12:54 Tara Vega (Blue Origin): Blue Origin may be interested in this material, please reach out to me via email! tvega@blueorigin.com 01:13:44 Dan Hawk: Reach out Stephen, Dan Hawk, dan.hawk@galxyz.net or itspaceagency@gmail.com, I am also Native American. 01:16:55 Lauren Micklow: @Meghan Bush: We have data from a UV VIS for most of the structures discussed 01:18:08 Chih-Hao Chang: Great question on the mechanical durability. Since the structure does not have very high aspect ratio they are relatively stable. They can be scratched with material with higher hardness, as shown in the sample. We are also working on materials with different hardness, such as silica glass 01:23:30 jacob: How safe are the application of such high voltages? 01:25:07 Kristoffer Sjolund: There is a very low current/power requirement for these systems. We are investigating ways to improve safety with coatings and improved manufacturing methods. 01:26:15 thom: The voltages can probably be dropped by closer spacing. This is currently a fabrication limit. 01:26:55 Stephen Furst: When you say "rough" are you referring to surface roughness? Do you have a sense of how rough they are? 01:27:48 Karamvir Gill: Is there any commercial suppliers for EDS traces ? 01:28:49 Kristoffer Sjolund: Roughness was a term that we used to describe the condition of the melt infiltration of the CMrGO into the HDPE substrate. "Rough" was less infiltrated than the "smooth" condition and therefore had a slightly raised surface. I do not recall the height of this raised surface off the top of my head. 01:29:47 thom: Yes....it has to do with the melt-ident process. We plan to try and control this with nanopatterning approaches. 01:29:50 Kristoffer Sjolund: While there are commercially available interdigitated electrode systems, we did not find any that matched our desired specifications. The PCB shown in the slide here was custom made 01:32:03 Tara Vega (Blue Origin): how did you apply an electrostatic charge to the dust test simulant? 01:33:07 Kristoffer Sjolund: For some experiments, we used the voice coil to impart a charge onto the dust simulant via tribocharging. This was not a measured application of charge however. 01:34:31 Kristoffer Sjolund: ksjolund3@gatech.edu 01:34:34 Stephen Furst: furst@smartmaterialsolutions.com 01:34:35 Chih-Hao Chang: chichang@utexas.edu 01:35:11 Julie Linsey: mschaible6@gatech.edu 01:35:23 Julie Linsey: My email is Julie.linsey@me.gatech.edu 01:35:34 Andrew Tunell: tunellandrew@utexas.edu 01:35:51 Kristoffer Sjolund: The masks were made using a wire EDM to cut sheet steel 01:37:09 Sarah Hasnain | Co-Lead, LSIC Dust + E&C: Thanks to our speakers and their teams! Lots of vibrant discussion 01:37:09 Micah Schaible: @stephen furst, we have profilomety of the surfaces in the SI of our paper. Emily’s paper also has a few surface images and further discussion of the fabrication details. 01:37:13 Lindsey Tolis: Path to Sustainable Tech in the Lunar Surface Environment: https://lsic.jhuapl.edu/Events/Agenda/index.php?id=481 01:37:16 HFR: If you need commercially available EDS grids please contact jbell@hedgefogresearch.com 01:37:28 Jason Mathews: Good luck in your continued development 01:37:28 Rickards, Ross M (US): ☝️ 01:37:29 Karamvir Gill: Thank you! 01:37:33 Chih-Hao Chang: Thank you!