Chemical functional characterization of immature and mature coals at the nanoscale by atomic force microscopy-based infrared spectroscopy (AFM-IR)

Phan, Van T.H.; Rebois, Rolando; Beck, Pierre; Quirico, E.; Noguchi, Takaaki; Takase, Minako

doi:10.1016/j.coal.2023.104196

Cited by 3 publications

(2 citation statements)

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“…Establishing a connection between remote sensing data (obtained at the millimeter to kilometer scale) and these nanometer-scale textures requires characterization techniques capable of measuring the spectral signature of Ryuguʼs space-weathered regions at submicrometer spatial resolution. Recently, new infrared techniques have been developed to overcome the diffraction limit, such as Nano-FTIR (Herman 2013;Kebukawa et al 2019;Yesiltas et al 2021) or photothermal atomic force microscopy-based infrared spectroscopy (AFM-IR; Dazzi & Prater 2017;Kebukawa et al 2019;Mathurin et al 2019Mathurin et al , 2022Phan et al 2022;Dartois et al 2023;Phan et al 2023). Both techniques can reach 50 nm spatial resolution with ∼8 cm −1 spectral resolution typically between 700 and 2000 cm −1 (Phan et al 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, new infrared techniques have been developed to overcome the diffraction limit, such as Nano-FTIR (Herman 2013;Kebukawa et al 2019;Yesiltas et al 2021) or photothermal atomic force microscopy-based infrared spectroscopy (AFM-IR; Dazzi & Prater 2017;Kebukawa et al 2019;Mathurin et al 2019Mathurin et al , 2022Phan et al 2022;Dartois et al 2023;Phan et al 2023). Both techniques can reach 50 nm spatial resolution with ∼8 cm −1 spectral resolution typically between 700 and 2000 cm −1 (Phan et al 2023). Unfortunately, the application of these techniques to Ryugu samples is difficult due to sample preparation issues.…”

Section: Introductionmentioning

confidence: 99%

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Linking Cause and Effect: Nanoscale Vibrational Spectroscopy of Space Weathering from Asteroid Ryugu

Laforet,

Le Guillou,

de la Peña

et al. 2024

ApJL

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Airless bodies are subjected to space-weathering effects that modify the first few microns of their surface. Therefore, understanding their impact on the optical properties of asteroids is key to the interpretation of their color variability and infrared reflectance observations. The recent Hayabusa2 sample return mission to asteroid Ryugu offers the first opportunity to study these effects, in the case of the most abundant spectral type among the main-asteroid belt, C-type objects. This study employs vibrational electron energy-loss spectroscopy in the transmission electron microscope to achieve the spatial resolution required to measure the distinct mid-infrared spectral signature of Ryugu's space-weathered surface. The comparison with the spectrum of the pristine underlying matrix reveals the loss of structural -OH and C-rich components in the space-weathered layers, providing direct experimental evidence that exposure to the space environment tends to mask the optical signatures of phyllosilicates and carbonaceous matter. Our findings should contribute to rectifying potential underestimations of water and carbon content of C-type asteroids when studied through remote sensing with new-generation telescopes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linking Cause and Effect: Nanoscale Vibrational Spectroscopy of Space Weathering from Asteroid Ryugu

Laforet,

Le Guillou,

de la Peña

et al. 2024

ApJL

Self Cite

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Deep learning methods for biomedical information analysis

Zhang

Dong

et al. 2023

J Ambient Intell Human Comput

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Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples

Quirico,

Bonal,

Kebukawa

et al. 2023

Meteorit & Planetary Scien

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We report a Fourier transform infrared analysis of functional groups in insoluble organic matter (IOM) extracted from a series of 100–500 μm Ryugu grains collected during the two touchdowns of February 22 and July 11, 2019. IOM extracted from most of the samples is very similar to IOM in primitive CI, CM, and CR chondrites, and shows that the extent of thermal metamorphism in Ryugu regolith was, at best, very limited. One sample displays chemical signatures consistent with a very mild heating, likely due to asteroidal collision impacts. We also report a lower carbonyl abundance in Ryugu IOM samples compared to primitive chondrites, which could reflect the accretion of a less oxygenated precursor by Ryugu. The possible effects of hydrothermal alteration and terrestrial weathering are also discussed. Last, no firm conclusions could be drawn on the origin of the soluble outlier phases, observed along with IOM in this study and in the preliminary analysis of Ryugu samples. However, it is clear that the HF/HCl residues presented in this publication are a mix between IOM and the nitrogen‐rich outlier phase.

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Chemical functional characterization of immature and mature coals at the nanoscale by atomic force microscopy-based infrared spectroscopy (AFM-IR)

Cited by 3 publications

References 41 publications

Linking Cause and Effect: Nanoscale Vibrational Spectroscopy of Space Weathering from Asteroid Ryugu

Linking Cause and Effect: Nanoscale Vibrational Spectroscopy of Space Weathering from Asteroid Ryugu

Deep learning methods for biomedical information analysis

Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples

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