麻豆原创

Lunar dust is more than a mild irritant or hallmark of an untidy room like dust found on Earth.

Lunar dust particles are sharp and abrasive due to the lack of atmosphere gradually dulling their surfaces, leading them to potentially damaging critical lunar equipment or causing respiratory issues for astronauts. Managing lunar dust (also known as regolith) and safeguarding astronauts or sensitive equipment on the moon isn鈥檛 as simple as sweeping it up with a broom and pan.

That鈥檚 why a team of NASA-funded 麻豆原创 researchers is pioneering a new nanocoating to passively mitigate the effects of lunar dust, protect equipment and ultimately extend future lunar missions.

鈥淭he dust particles on the moon are very sharp, very sticky and very toxic,鈥� says Lei Zhai, director of the NanoScience Technology Center and project lead. 鈥淩ight now, the efforts we have seen are based on studies here on Earth, and so we want to have a more complete picture of the interactions and guide the design on how to mitigate dust using a simulated lunar environment.鈥�

麻豆原创鈥檚 research team aims to conduct testing as true to a lunar environment as possible through modeling and the use of a simulated regolith in a vacuum chamber to mimic lunar conditions and exclude the effects of Earth鈥檚 atmosphere. The goal is to understand how lunar dust interacts with surfaces and which surface properties, such as surface structures, polarity and electrical conductivity, are key to repelling the dust, even in complex lunar charged particle and light radiation environments.

鈥淚t鈥檚 a really new, novel way to approach this. Lunar dust is one of the most significant problems that we have for going to the moon, especially for long duration stays.” 鈥� Adrienne Dove, professor of physics

鈥淲e鈥檒l put our engineered coatings or surfaces into the vacuum chamber with lunar simulants and study how the dust interacts with the surfaces in the simulated lunar surface environment,鈥� Zhai says. 鈥淭here is also strong irradiation on the moon, so we will also introduce irradiation sources in the setup. We also will use a specific instrument called an atomic force microscope to study these specific interactions at the dust particle level.鈥�

Repeated experimentation will allow Zhai and his team to adjust surface structure, hardness, conductivity and other properties to further fine tune the surface coatings.

鈥淲ith that data, we can design specific surface structures for effective dust mitigation,鈥� he says. 鈥淢y role is to provide the surface. Then I鈥檒l give this surface to Dr. [Laurene] Tetard who will carry out the atomic force microscope studies and also Dr. [Adrienne] Dove who has a vacuum chamber and irradiation sources.鈥�

Dove, who is a professor of physics and the department chair, says she鈥檚 excited to work on this project.

鈥淚t鈥檚 a really new, novel way to approach this,鈥� she says. 鈥淟unar dust is one of the most significant problems that we have for going to the moon, especially for long duration stays. So, it鈥檚 really exciting to be working on this, and to be doing this as an applied way to look at lunar dust problems.鈥�

Dove has been studying lunar dust physics for many years, and this project extends her existing knowledge and outcomes to how they may directly affect exploration. For this project, she studies how the dust particles interact with the new coatings during the experiments in the vacuum chamber to better inform the prototype coatings Zhai will develop.

鈥淎 lot of the work I do is to implement different ways to measure the sticking forces of dust grains and other materials,鈥� Dove says. 鈥淪o, one way to do that is to put a lot of dust on a surface and then to spin the surface really fast with a centrifuge and see at what speed the grains come off 鈥� we use that to measure the force.鈥�

The research team hopes that their new understandings of lunar dust can inform more efficient ways to reduce the dust鈥檚 harmful interactions with surfaces by minimizing efforts to physically remove the dust and instead use passive methods such as relying on solar wind or radiation.

鈥淲hen astronauts are hopping around the surface or rovers are driving around, they鈥檙e going to stir up dust, and that dust naturally gets all over the place,鈥� she says. 鈥淲e think of it like when we get sand on us at the beach, you can mostly just wipe it off. Sometimes you get a little scratched, though. That same thing can happen with lunar dust, but it鈥檚 much worse than beach sand 鈥� much harder to get clean and its scratchier.鈥�

The researchers are opting to explore passive methods to mitigate the dust to avoid potentially scratching technologies such as sensors or cameras by wiping away dust. Passive dust mitigation may rely on solar wind, radiation or other passive forces distinct from an active approach such as applying an electric field to remove the dust.

鈥淭his project is really focusing on passive ways to change the surface so that dust just doesn’t stick as well in the first place,鈥� Dove says. 鈥淪o, if we do things like shake it off or blow some air on it the dust comes off more easily.鈥�

The idea for the project progressed as the team continually discussed dust and surface interactions over the years.

Laurene Tetard, a professor of physics, specializes in atomic force microscopy. Atomic force microscopes (AFM) are powerful enough to examine challenges at the nanoscale, and they are critical to further understanding the dust experiments in the vacuum chamber and the effectiveness of the surfaces engineered by Zhai.

鈥淲e are hoping to develop a new platform that links nanoscience and space research in a new way.鈥� 鈥擫aurene Tetard, professor of physics

鈥淲e are hoping to develop a new platform that links nanoscience and space research in a new way,鈥� Tetard says. 鈥淲e will design a platform that can perform these measurements under conditions that mimic space conditions. The information obtained from these measurements will provide important feedback to optimize the engineered surface.鈥�

She says expanding the frontiers of AFM to space research is particularly unique, and that the future opportunities to build on this research are equally gratifying.

鈥淚t will be great to train students in this new direction for future applications of interest of NASA and other space-related industries,鈥� Tetard says. 鈥淎nd it鈥檚 especially exciting to do that with experts in these fields who know a lot about the complementary aspects of this work.鈥�

Tarek Elgohary, associate professor of mechanical and aerospace engineering, is collaborating with other team members to create simulations that will help them understand how the particles interact with each other and with different surfaces.

鈥淲e鈥檝e got particle-to-particle and particle to surface interactions,鈥� he says. 鈥淲e want to simulate those on the computers and then match what we know from the experiments, such as the physical properties, with what we get from the simulation. So essentially, we鈥檙e trying to close the loop between simulations and experiments to better understand the physical phenomenon.鈥�

Understanding how electrical charges may move amongst dust particles and how the dust maintains charges or discharges through simulated environments is an important aspect of the research component that Elgohary is studying.

鈥淭hat will essentially help us with the design process of the passive mitigation techniques that Lei, Addie and Laurene are looking into,鈥� he says.

The interdisciplinary nature of the project and the longstanding desire to tackle the elusive challenge of lunar dust are some of what Elgohary says are most rewarding aspects of the research process.

鈥淚 started talking to Addie many years ago, and we have had several efforts to try to understand how the dust moves and interacts,鈥� he says. 鈥淚t鈥檚 a fascinating problem, and it requires understanding the physics and connecting that to an engineering application to allow us to have a greater presence on the lunar surface. The fact that there are four of us covering each piece of this problem is one of the of the most exciting things about this project.鈥�

Researchers鈥� Credentials:

Dove received her doctorate in astrophysical and planetary sciences from the University of Colorado at Boulder and her bachelor鈥檚 degree in physics and astronomy from the University of Missouri. She joined 麻豆原创鈥檚 Department of Physics in 2012. In 2017, Dove was awarded the Susan Niebur Early Career Award by the NASA Solar System Exploration Virtual Research Institute for her contributions to the science and exploration communities. She is the deputy-principal investigator of the Lunar-VISE mission to the moon鈥檚 Gruithuisen Domes to examine lunar rocks and regolith, slated to launch in 2027.

Elgohary joined 麻豆原创 in 2016 as an assistant professor. He manages the Astrodynamics, Space and Robotics Laboratory in the Department of Mechanical and Aerospace Engineering. He earned a bachelor鈥檚 degree in mechanical engineering from the American University in Cairo and a master鈥檚 degree and doctoral degree in aerospace engineering from Texas A&M University. Elgohary鈥檚 research interests are developing analytical & computational techniques for multi-body dynamics problems, astrodynamics, space domain awareness and space flight guidance, navigation, and control problems. His research has been funded by the U.S. Air Force Office of Scientific Research, the Federal Aviation Administration, NASA, Lockheed Martin and the U.S. Space Force.

Tetard received her doctorate in physics from the University of Tennessee, Knoxville and joined 麻豆原创鈥檚 NanoScience Technology Center and Department of Physics in 2013. She is a U.S. National Science Foundation Faculty Early Career Development Program awardee and Moore Experimental Physics Investigator awardee. Her team’s research focuses on developments of Scanning Probe Microscopy to study complex systems with applications in life sciences, materials, energy, catalysis and more.

Zhai is a 麻豆原创 professor who received his doctorate in chemistry from Carnegie Mellon University. He joined 麻豆原创鈥檚 NanoScience Technology Center and Department of Chemistry in 2005. Zhai is a Scialog Fellow at Research Corporation for Science Advancement and received an NSF CAREER award in 2008. He was the faculty advisor of a 麻豆原创 team that won the Breakthrough, Innovative and Game-Changing Idea Challenge in 2021.

The material is based upon work supported by NASA ESI Program Award 80NSSC25K7282. Any opinions, findings, conclusions or recommendations expressed in this material are those of the principal investigators and do not necessarily reflect the views of NASA.