Simulating permeability reduction by clay mineral nanopores in a tight sandstone by combining μXCT and FIB-SEM imaging

Jacob, Arne F.; Peltz, Markus; Hale, Sina; Enzmann, Frieder; Moravcova, Olga; Warr, Laurence N.; Grathoff, Georg; Blum, Philipp; Kersten, Michael

doi:10.5194/se-2020-151

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…This program utilizes supervised machine learning [64] to sort image portions into certain categories (i.e., image segmentation) based on user-supplied training data. Ilastik was successfully applied in two-and three-dimensional pore space reconstructions of sedimentary rocks [65,66]. In the present study, we employed the toolkit to classify each pixel , taken after oxidation of the organic matrix by immersion in 10.5 vol% H 2 O 2 for 20 minutes (image A magnified for visual clarity).…”

Section: Plos Onementioning

confidence: 99%

Temperature-induced microstructural changes in shells of laboratory-grown Arctica islandica (Bivalvia)

Höche¹,

Walliser²,

Winter

et al. 2021

PLoS ONE

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Bivalve shells are increasingly used as archives for high-resolution paleoclimate analyses. However, there is still an urgent need for quantitative temperature proxies that work without knowledge of the water chemistry–as is required for δ18O-based paleothermometry–and can better withstand diagenetic overprint. Recently, microstructural properties have been identified as a potential candidate fulfilling these requirements. So far, only few different microstructure categories (nacreous, prismatic and crossed-lamellar) of some short-lived species have been studied in detail, and in all such studies, the size and/or shape of individual biomineral units was found to increase with water temperature. Here, we explore whether the same applies to properties of the crossed-acicular microstructure in the hinge plate of Arctica islandica, the microstructurally most uniform shell portion in this species. In order to focus solely on the effect of temperature on microstructural properties, this study uses bivalves that grew their shells under controlled temperature conditions (1, 3, 6, 9, 12 and 15°C) in the laboratory. With increasing temperature, the size of the largest individual biomineral units and the relative proportion of shell occupied by the crystalline phase increased. The size of the largest pores, a specific microstructural feature of A. islandica, whose potential role in biomineralization is discussed here, increased exponentially with culturing temperature. This study employs scanning electron microscopy in combination with automated image processing software, including an innovative machine learning–based image segmentation method. The new method greatly facilitates the recognition of microstructural entities and enables a faster and more reliable microstructural analysis than previously used techniques. Results of this study establish the new microstructural temperature proxy in the crossed-acicular microstructures of A. islandica and point to an overarching control mechanism of temperature on the micrometer-scale architecture of bivalve shells across species boundaries.

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Section: Plos Onementioning

confidence: 99%

Temperature-induced microstructural changes in shells of laboratory-grown Arctica islandica (Bivalvia)

Höche¹,

Walliser²,

Winter

et al. 2021

PLoS ONE

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Comparison of SEM-Assisted Nanoporometric and Microporometric Morphometric Techniques Applied for the Ultramicroporous Polymer Films

Maklakova

Градов

Gradova

et al. 2021

KEM

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One of the most important applications of polymeric porous nanomaterials is the design of nanoporous structures for operation in patch-clamp systems allowing to establish a gigaohm contact, as well as for the measurements of biomolecules, informational macromolecules, including DNA, translocating through the nanopore arrays. Development of nanopore sequencing techniques leads to fundamentally new big data arrays, but their representativeness and validity, as well as the validity of counting of biomacromolecular particles based on ultramicropore arrays, strongly depends both on the pore size (in engineering lithography unimodal pore size distribution is optimal) and the accuracy of the size distribution measurements using instrumental methods. However, the former is unattainable when using soft matter or stretchable, plastic and elastic polymer materials and films, while the latter depends on the metrological parameters of the instrumental and algorithmic porosimetry techniques. Therefore in this paper the question about the applicability of polymer materials with pore arrays for the studies of biomacromolecules and bionanostructures is proposed to be answered using a comparative analysis of two different porosimetry approaches with the resolution not lower than electron microscopic one.

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Simulating permeability reduction by clay mineral nanopores in a tight sandstone by combining μXCT and FIB-SEM imaging

Cited by 2 publications

References 49 publications

Temperature-induced microstructural changes in shells of laboratory-grown Arctica islandica (Bivalvia)

Temperature-induced microstructural changes in shells of laboratory-grown Arctica islandica (Bivalvia)

Comparison of SEM-Assisted Nanoporometric and Microporometric Morphometric Techniques Applied for the Ultramicroporous Polymer Films

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