Reply to “On the origin of molecular oxygen in cometary comae”

Yao, Yunxi; Giapis, Konstantinos P.

doi:10.1038/s41467-018-04943-w

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…For example, we have verified experimentally that the reaction takes place on indium–tin oxide (ITO), a man-made material found on Rosetta’s thermal insulation and solar panels. Thus, CO 2 collisions on the spacecraft’s exposed surfaces can change the composition of the surrounding gaseous halo with unknown repercussions for mass spectrometric measurements 31 .…”

Section: Discussionmentioning

confidence: 99%

Direct dioxygen evolution in collisions of carbon dioxide with surfaces

et al. 2019

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The intramolecular conversion of CO 2 to molecular oxygen is an exotic reaction, rarely observed even with extreme optical or electronic excitation means. Here we show that this reaction occurs readily when CO 2 ions scatter from solid surfaces in a two-step sequential collision process at hyperthermal incidence energies. The produced O 2 is preferentially ionized by charge transfer from the surface over the predominant atomic oxygen product, leading to direct detection of both O 2 + and O 2 − . First-principles simulations of the collisional dynamics reveal that O 2 production proceeds via strongly-bent CO 2 configurations, without visiting other intermediates. Bent CO 2 provides dynamic access to the symmetric dissociation of CO 2 to C+O 2 with a calculated yield of 1 to 2% depending on molecular orientation. This unexpected collision-induced transformation of individual CO 2 molecules provides an accessible pathway for generating O 2 in astrophysical environments and may inspire plasma-driven electro- and photo-catalytic strategies for terrestrial CO 2 reduction.

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Section: Discussionmentioning

confidence: 99%

Direct dioxygen evolution in collisions of carbon dioxide with surfaces

et al. 2019

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“…At the same time, Yao and Giapis (2018) argued that "cold" water ions, whose flux is about 100 times that of the "accelerated" water ions (Nilsson et al 2015) bombarding the spacecraft could produce O 2 in situ. Whether this O 2 would be detected by DFMS is uncertain as the DFMS response under exposure to a lowpressure water plasma containing O 2 is unknown (Yao and Giapis 2018). It is also important to note that Alice has detected O 2 independently of ROSINA (Keeney et al 2017a), and post-perihelion Alice results indicate that the relative O 2 /H 2 O decreases with increasing impact parameter above the nucleus (Keeney et al 2017b).…”

Section: Omentioning

confidence: 99%

Origin of Molecular Oxygen in Comets: Current Knowledge and Perspectives

et al. 2018

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The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument onboard the Rosetta spacecraft has measured molecular oxygen (O 2) in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) in surprisingly high abundances. These measurements mark the first unequivocal detection of O 2 in a cometary environment. The large relative abundance of O 2 in 67P/C-G despite its high reactivity and low interstellar abundance poses a puzzle for its origin in comet 67P/C-G, and potentially other comets. Since its detection, there have been a number of hypotheses put forward to explain the production and origin of O 2 in the comet. These hypotheses cover a wide range of possibilities from various in situ production mechanisms to protosolar nebula and primordial origins. Here, we review the O 2 formation mechanisms from the literature, and provide a comprehensive summary of the current state of knowledge of the sources and origin of cometary O 2 .

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“…[ 125 ] Researchers have developed various surface morphologies, including the fabrication of pillars, lines, pyramids and hemispherical‐like nanopatterns. [ 126 ] These nanopatterns enhance the charge production by increasing the contact area of the triboelectric materials. Various combinations of molecules, particles, and wires have been used to form those nanostructures in the contacting surfaces using different approaches such as nanoimprint lithography [ 127 ] and electrospinning.…”

Section: Dp‐tengsmentioning

confidence: 99%

3D‐Printed Triboelectric Nanogenerators: State of the Art, Applications, and Challenges

Mahmud

Zolfagharian

Gharaie

et al. 2021

Adv Energy and Sustain Res

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Triboelectric nanogenerator (TENG) development is undergoing rapid progress utilizing the state‐of‐the‐art 3D‐printing technologies. Herein a critical analysis of the latest developments in 3D‐printed wearable and implantable TENGs that can be used to energize small portable electronic and biomedical devices is presented. Recent progress in 3D‐printed triboelectric nanogenerator (3DP‐TENG) materials and architectural formations, as well as their performance, is evaluated for powering systems that implement physiological monitoring, multifunctional sensing, electronic energizing, noise canceling, dust filtering, and self‐healing. Furthermore, the review explicitly focuses on the 3D‐printing approaches used to form stable and robust 3DP‐TENGs. In addition, the key challenges to improving the performance of 3DP‐TENGs for optimal energy harvesting are discussed, and a roadmap is given for research and translation to commercial markets in the next decade.

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Reply to “On the origin of molecular oxygen in cometary comae”

Cited by 4 publications

References 19 publications

Direct dioxygen evolution in collisions of carbon dioxide with surfaces

Direct dioxygen evolution in collisions of carbon dioxide with surfaces

Origin of Molecular Oxygen in Comets: Current Knowledge and Perspectives

3D‐Printed Triboelectric Nanogenerators: State of the Art, Applications, and Challenges

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