Application of electron microscopy TEM and SEM for analysis of coals, organic-rich shales and carbonaceous matter

Kwiecińska, Barbara; Pusz, S.; Valentine, Brett J.; Iccp,

doi:10.1016/j.coal.2019.05.010

Cited by 92 publications

(35 citation statements)

References 128 publications

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“…Two‐dimensional SEM images at nanoscale resolution are commonly used to observe the pore geometry and pore type 26,41,42 . The division of pore types in shale reservoirs plays an important role in further analyzing the micropores in shale.…”

Section: Resultsmentioning

confidence: 99%

A 3D FIB‐SEM technique for quantitative characterization of oil shale's microstructure: A case study from the Shahejie Formation in Dongying Depression, China

Zhao

Dong

Zhang

et al. 2020

Energy Science & Engineering

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Investigating the pore structure of shale rocks plays an important role in understanding the mechanism of shale oil accumulation and migration; thus, it has a notable influence on the exploration and development of shale oil resources. In the present study, the microstructure of oil shale samples extracted from the Shahejie Formation in the Dongying Depression was investigated through the joint usage of focused ion beam (FIB) and scanning electron microscopy (SEM). Herein, we selected four representative samples. The SEM images of the sample surfaces milled by FIB indicated that pores were found in both the organic and inorganic matter. Organic pores were less developed in the samples because of the low thermal maturity of the organic matter. Continuous 3D digital rock images of shale samples were generated by FIB grinding and SEM in situ imaging. Based on multithreshold segmentation, the shale rocks were separated into different parts including kerogen, inorganic matter, and pores. The pore connectivity and pore size distributions were analyzed via Avizo software and in‐house developed MATLAB scripts. The pore size and corresponding volume distributions suggested that mesoscale pores (2‐50 nm) were abundant in the samples but they contributed limitedly to the total pore volume. Macropores (>50 nm) accounted for a small proportion but they had a greater contribution to the overall pore space volume. The coordination numbers of the subject four samples were mainly 0 and 1, which means that isolated pores accounted for the vast majority of the pores. These observations are critical to conduct reliable petrophysical simulations in the oil shales and understand their intrinsic properties accurately.

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Section: Resultsmentioning

confidence: 99%

A 3D FIB‐SEM technique for quantitative characterization of oil shale's microstructure: A case study from the Shahejie Formation in Dongying Depression, China

Zhao

Dong

Zhang

et al. 2020

Energy Science & Engineering

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“…where P r is expansion pressure, MPa; E s is elastic modulus of steel tube (2.060 × 105 MPa); K is the ratio of the outside diameter to the inside diameter of the steel tube, mm/mm; ε θ is the circumferential direction strain values of the steel tube; and ] is Poisson's ratio, 0.3. A JSM-IT100 scanning electron microscope was used to examine the microstructure of the hydrated blasting materials and the coal samples [25,26]. A KKS-5690A gas chromatograph was used to analyze gas from coal by the action of static blasting materials.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics

Cui

Zhang

Guo

et al. 2020

Advances in Materials Science and Engineering

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Methane in coal seam is always under the dynamic process of adsorption and desorption. It has been demonstrated that the static blasting technology is an effective way to extract methane from coal. Although it is of great significance to understand the role of static blasting materials on methane extraction, the change of methane during static blasting is not well understood due to limited research studies. In this paper, we took the reaction pressure and heat from the hydration of the static blasting materials as the main factors. Microstructure changes in the static blasting materials and coal were analyzed by scanning electron microscopy, gas chromatography, infrared spectroscopy, and mercury injection. Changes of methane adsorption and adsorption rate before and after the static blasting were also measured. Our results demonstrated that the static blasting materials entered the microcracks of the coal body and the porosity of the coal was increased by heat expansion, improving methane migration. During the blasting process, methane began to desorb from the coal and its adsorption content was decreased. In contrast, the adsorption of methane was increased after the reaction. However, methane adsorption rate is higher than that of raw coal, indicating that the adsorbed methane is easier to convert into free methane, which is conducive to emission. This is of great significance to methane extraction and the safety of mines.

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“…Finally, Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) have been widely used for NPs characterization, where both can show the size, aggregation degree, as well as dispersion within the sample [115]. SEM is a versatile technique able to provide information about the morphology, composition, and topography of NPs surface by generating signals due to interactions presented between the electron beam and the sample [116,117].…”

Section: Instrumental Techniques For the Characterizationmentioning

confidence: 99%

Green Synthesis of Metal Nanoparticles from Plant Extracts, and Their Possible Application as Antimicrobial Agents in the Agricultural Area

Henríquez¹,

Alfaro-Aguilar²,

Ugalde-Álvarez³

et al. 2020

Preprint

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Currently, metal nanoparticles have varied uses for different medical, pharmaceutical, and agricultural applications. Nano-biotechnology combined with green chemistry has great potential for the development of novel and necessary products that benefit human activities, while encourages the reduction of hazardous reagents for nanoparticle production. Green chemistry has an important role due to its contribution to unconventional synthesis methods of gold and silver nanoparticles from plant extracts, which have exhibited antimicrobial potential among other outstanding properties. Biodiversity-rich countries need to collect and convert knowledge from biological resources into processes, compounds, methods, and tools, which need to be achieved along with sustainable use and exploitation of biological diversity. Therefore, this review focuses on the importance of metal nanoparticles, the use of plant extract for their synthesis as well as other available methods, and the relevant antimicrobial activity that can be exploited in a sustainable model of agricultural management through a modern nanotechnological approach.

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Application of electron microscopy TEM and SEM for analysis of coals, organic-rich shales and carbonaceous matter

Cited by 92 publications

References 128 publications

A 3D FIB‐SEM technique for quantitative characterization of oil shale's microstructure: A case study from the Shahejie Formation in Dongying Depression, China

A 3D FIB‐SEM technique for quantitative characterization of oil shale's microstructure: A case study from the Shahejie Formation in Dongying Depression, China

The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics

Green Synthesis of Metal Nanoparticles from Plant Extracts, and Their Possible Application as Antimicrobial Agents in the Agricultural Area

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