Clustering of charged colloidal particles in the microgravity environment of space

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dc.contributor.authorMiki,.H.en_AU
dc.contributor.authorIshigami, Ten_AU
dc.contributor.authorYamanaka, Jen_AU
dc.contributor.authorOkuzono, Ten_AU
dc.contributor.authorToyotama, Aen_AU
dc.contributor.authorMata, JPen_AU
dc.contributor.authorKomazawa, Hen_AU
dc.contributor.authorTakeda, Yen_AU
dc.contributor.authorMinami, Men_AU
dc.contributor.authorFujita, Men_AU
dc.contributor.authorDoi, Men_AU
dc.contributor.authorHiguchi, Ten_AU
dc.contributor.authorTakase, Hen_AU
dc.contributor.authorAdachi, Sen_AU
dc.contributor.authorSakashita, Ten_AU
dc.contributor.authorShimaoka, Ten_AU
dc.contributor.authorNagai, Men_AU
dc.contributor.authorWatanabe, Yen_AU
dc.contributor.authorFukuyama, Sen_AU
dc.date.accessioned2023-11-19T23:32:22Zen_AU
dc.date.available2023-11-19T23:32:22Zen_AU
dc.date.issued2023-04-29en_AU
dc.date.statistics2023-06-05en_AU
dc.description.abstractWe conducted a charge–charge clustering experiment of positively and negatively charged colloidal particles in aqueous media under a microgravity environment at the International Space Station. A special setup was used to mix the colloid particles in microgravity and then these structures were immobilized in gel cured using ultraviolet (UV) light. The samples returned to the ground were observed by optical microscopy. The space sample of polystyrene particles with a specific gravity ρ (=1.05) close to the medium had an average association number of ~50% larger than the ground control and better structural symmetry. The effect of electrostatic interactions on the clustering was also confirmed for titania particles (ρ ~ 3), whose association structures were only possible in the microgravity environment without any sedimentation they generally suffer on the ground. This study suggests that even slight sedimentation and convection on the ground significantly affect the structure formation of colloids. Knowledge from this study will help us to develop a model which will be used to design photonic materials and better drugs. © 2023 The Authors, Open Access under a Creative Commons Attribution 4.0 International License. Published in cooperation with the Biodesign Institute at Arizona State University, with the support of NASA.en_AU
dc.description.sponsorshipWe thank the MSPR engineering and integration staff for enterprising research (MEISTER) and the on-orbit crew for their precise operations that made the experiment a success. This work was partly supported by a JSPS KAKENHI grant (17K04990). We sincerely thank Misato Suko, Hajime Hattori, Yoko Kondo, and Kazushi Yamamoto, Faculty of Pharmaceutical Sciences, Nagoya City University, for their participation in the preparatory study to determine the conditions of the space experiment. Sincere thanks are due to Yui Nakata, AES Co., Ltd., for her help in preparing the space experiments. We thank Yumika Uenishi, Yuri Nakamura, and Natsumi Masuda for their help in the data analysis of the space sample aggregates. We acknowledge the support of the Australian Centre for Neutron Scattering, ANSTO, and the Australian Government through the National Collaborative Research Infrastructure Strategy in providing the neutron research infrastructure used in this work via ACNS proposals 7063 & 9971. This work benefited from the use of the SasView application, originally developed under NSF award DMR-0520547. SasView contains code developed with funding from the European Union’s Horizon 2020 research and innovation program under the SINE2020 project, grant agreement No 654000. We thank Mr. Yutaka Hattori, KEYENCE Co., Ltd., for the discussion. We acknowledge the assistance of the Research Equipment Sharing Center at Nagoya City University for the SEM observation. This research was supported by Japan Science and Technology Agency, ‘Establishment of University Fellowships towards the Creation of Science Technology Innovation’.en_AU
dc.identifier.articlenumber33en_AU
dc.identifier.citationMiki, H., Ishigami, T., Yamanaka, J., Okuzono, T., Toyotama, A., Mata, J., Komazawa, H., Takeda, Y., Minami, M., Fujita, M., Doi, M., Higuchi, T., Takase, H., Adachi, S., Sakashita, T., Shimaoka, T., Nagai, M., Watanabe, Y., & Fukuyama, S. (2023). Clustering of charged colloidal particles in the microgravity environment of space. npj Microgravity, 9(1), 33. doi:10.1038/s41526-023-00280-5en_AU
dc.identifier.issn2373-8065en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitlenpj Microgravityen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15208en_AU
dc.identifier.volume9en_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.relation.urihttps://doi.org/10.1038/s41526-023-00280-5en_AU
dc.subjectExperiment resultsen_AU
dc.subjectCharged particlesen_AU
dc.subjectInternational Space Stationen_AU
dc.subjectOptical microscopyen_AU
dc.subjectEnvironmenten_AU
dc.subjectColloidsen_AU
dc.subjectPolystyreneen_AU
dc.titleClustering of charged colloidal particles in the microgravity environment of spaceen_AU
dc.typeJournal Articleen_AU
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