Scanning electron microscopical and cross sectional analysis of extraterrestrial carbonaceous nanoglobules

Garvie, L. A. J.; Baumgardner, Grant; Buseck, Peter R.

doi:10.1111/j.1945-5100.2008.tb01088.x

Cited by 23 publications

(4 citation statements)

References 16 publications

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“…In the organic matter of carbonaceous chondrites (CI, CO, CM, CR, and ungrouped Tagish Lake), spherical particles with diameters of <20 nm to a few micrometers have been found forming clusters and intergrowths (Garvie et al 2008;De Gregorio et al 2013). The smallest nanoglobules are observed in IOM from the leastaltered, and thus better preserved, chondrites (De Gregorio et al 2013).…”

Section: Nanostructure Of Dcors and Their Relevance To Organic Compomentioning

confidence: 90%

Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation

Piani

Tachibana

Hama

et al. 2017

ApJ

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Refractory organic compounds formed in molecular clouds are among the building blocks of the solar system objects and could be the precursors of organic matter found in primitive meteorites and cometary materials. However, little is known about the evolutionary pathways of molecular cloud organics from dense molecular clouds to planetary systems. In this study, we focus on the evolution of the morphological and viscoelastic properties of molecular cloud refractory organic matter. We found that the organic residue, experimentally synthesized at ∼10 K from UV-irradiated H 2 O-CH 3 OH-NH 3 ice, changed significantly in terms of its nanometerto micrometer-scale morphology and viscoelastic properties after UV irradiation at room temperature. The dose of this irradiation was equivalent to that experienced after short residence in diffuse clouds (10 4 years) or irradiation in outer protoplanetary disks. The irradiated organic residues became highly porous and more rigid and formed amorphous nanospherules. These nanospherules are morphologically similar to organic nanoglobules observed in the least-altered chondrites, chondritic porous interplanetary dust particles, and cometary samples, suggesting that irradiation of refractory organics could be a possible formation pathway for such nanoglobules. The storage modulus (elasticity) of photo-irradiated organic residues is ∼100 MPa irrespective of vibrational frequency, a value that is lower than the storage moduli of minerals and ice. Dust grains coated with such irradiated organics would therefore stick together efficiently, but growth to larger grains might be suppressed due to an increase in aggregate brittleness caused by the strong connections between grains.

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Section: Nanostructure Of Dcors and Their Relevance To Organic Compomentioning

confidence: 90%

Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation

Piani

Tachibana

Hama

et al. 2017

ApJ

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“…This inclusion with a strong CH X signal has a morphology resembling that of nanoglobules observed in other types of primitive meteorites (e.g., Garvie et al 2008;Nakamura-Messenger et al 2006;De Gregorio et al 2013), in Stardust's samples from the comet 81P (Wild2) (De Gregorio et al 2010, in IDPs and micrometeorites (Messenger et al 2008;Maurette et al 1995), and in other Ryugu samples (Daly et al 2022;Yabuta et al 2023;Stroud et al 2022). Hereafter, the organic nanoparticles identified in this study are referred to as "nanoglobule-like" particles.…”

Section: Ryugu 'Whole-rock' Samplementioning

confidence: 67%

“…In meteorites, nanoglobules typically range in size from less than 200 nm to an upper limit of about 1 to 2 µm (e.g., Nakamura et al 2002;Garvie & Buseck 2004;Floss & Stadermann 2009;Herd et al 2011;De Gregorio et al 2013;Changela 2015) They can occur as isolated structures in the matrix or in clusters (e.g., Garvie et al 2008). The average size of the nanoglobules tends to increase with the level of aqueous alteration of the meteorites (De Gregorio et al 2013), suggesting that all nanoglobules may be sensitive to aqueous alteration.…”

Section: Ryugu Nanoglobule-like Particles Compared To Their Meteoriti...mentioning

confidence: 99%

AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

Mathurin,

Bejach,

Dartois

et al. 2024

A&A

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The JAXA Hayabusa2 mission returned well-preserved samples collected from the carbonaceous asteroid Ryugu, providing unique non-terrestrially weathered samples from a known parent body. This work aims to provide a better understanding of the formation and evolution of primitive asteroidal matter by studying the fine scale association of organic matter and minerals in Ryugu samples. We characterized the samples by IR nanospectroscopy using the AFM-IR technique. This technique overcomes the diffraction limit (of several microns) of conventional infrared microspectroscopy (µ-FTIR). The samples were mapped in the mid-IR range at a lateral spatial resolution about a hundred times better than with µ-FTIR. This provided us with unique in situ access to the distribution of the different infrared signatures of organic components at the sub-micron scale present in the Ryugu whole-rock samples as well as to the characterization of the compositional variability of Ryugu in the insoluble organic matter (IOM) chemically extracted from the Ryugu samples. The AFM-IR maps of whole-rock particles and IOM residues from Ryugu samples were recorded with a lateral resolution of tens of nanometers. Spectra were recorded in the 1900-900 cm$^−1$ spectral range by AFM-IR (Icon-IR) for all samples, and additional spectra were recorded from 2700 to 4000 cm$^−1$ for one IOM sample by an optical photothermal IR (O-PTIR) technique using a mIRage$^ textregistered $ IR microscope. Organic matter is present in two forms in the whole-rock samples: as a diffuse phase intermixed with the phyllosilicate matrix and as individual organic nanoparticles. We identify the Ryugu organic nanoparticles as nanoglobule-like inclusions texturally resembling nanoglobules present in primitive meteorites. Using AFM-IR, we record for the first time the infrared spectra of Ryugu organic nanoparticles that clearly show enhanced carbonyl (C=O) and CH contributions with respect to the diffuse organic matter in Ryugu whole-rock and IOM residue.

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“…Extraterrestrial organic matter is typically submicron in size, and most organic compounds (e.g., carbonyls, hydrocarbons, etc.) are even smaller (De Gregorio et al., 2013; Garvie et al., 2008; Nakamura‐Messenger et al., 2006; Yesiltas, Glotch, & Sava, 2021). Spatial resolution of conventional IR methods generally varies from >5 μm (Dartois et al., 2023) to 25 μm (Morlok et al., 2020), and it goes down to ∼1 μm if multi‐beam synchrotron radiation and array detectors are used (Nasse et al., 2011; Yesiltas et al., 2014; Yesiltas & Kebukawa, 2016).…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Yesiltas,

Glotch,

Kebukawa

et al. 2024

JGR Planets

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Carbonaceous asteroids are leftover materials from the early solar system. They did not undergo planetary differentiation processes and thus still retained signatures and clues of the origin and evolution of the solar system. Thus, samples of carbonaceous asteroids provide significant potential for deciphering the origin of the solar system. The Hayabusa2 spacecraft returned the first samples of a carbonaceous asteroid (162173) Ryugu. In this work, we report the nanoscale mineralogy and organic matter content of two Ryugu particles, A0030 and C0034. These were analyzed by highly novel scattering‐type scanning near‐field optical microscopy (s‐SNOM)‐based nanoscale‐Fourier transform infrared (nano‐FTIR) spectroscopy with ∼20 nm spatial resolution. The nano‐FTIR measurements were supported by confocal micro‐Raman imaging and spectroscopy (∼500 nm/pixel spatial sampling). Our investigations show that the two Ryugu particles (a) contain different silicate mineralogies, indicating heterogeneous and incomplete aqueous alteration and (b) are highly rich in organic matter, consisting a variety of molecular functional groups. The spatial distributions of chemical functional groups and their associations based on pseudo‐heterodyne (PsHet) SNOM imaging show that the organic matter is distributed as either diffused or discrete grains. Micro‐Raman spectra show that the Ryugu particles experienced minimal thermal metamorphism, although A0030 was slightly more heated than C0034. The identification of abundant nanoscale organic molecules within the Ryugu grains that could not be identified via micrometer‐scale investigations emphasizes the importance of using nanoscale nondestructive methods for studying primitive solar system materials, such as Ryugu and OSIRIS‐Rex particles and those that will be returned in the future (such as MMX samples).

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Scanning electron microscopical and cross sectional analysis of extraterrestrial carbonaceous nanoglobules

Cited by 23 publications

References 16 publications

Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation

Evolution of Morphological and Physical Properties of Laboratory Interstellar Organic Residues with Ultraviolet Irradiation

AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

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