Textural characterization of coals using fractal analysis

Mahamud, Manuel María; López, O. González; Pís, J.J.; Pajares, J.A.

doi:10.1016/s0378-3820(03)00004-3

Cited by 101 publications

(44 citation statements)

References 10 publications

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“…As a consequence of this, the correlation coefficients for the Friesen's fit are generally low [11][12][13][14][15].…”

Section: Methods Used For the Determination Of Surface Fractal Dimensmentioning

confidence: 97%

“…These methods have already been used to characterize series of materials constituted by oxidized coals [11], chars [12] and active carbons [13]. Recently, Zhang et al [31] proposed an improvement of their procedure.…”

Section: Methods Used For the Determination Of Surface Fractal Dimensmentioning

confidence: 99%

“…For actual objects the fractal character cannot be the same for the whole range of sizes. This fact opens up the possibility of obtaining fractal profiles of porous solids that constitute a very useful tool for characterizing porous materials [10][11][12][13]. Data from mercury porosimetry determinations are suitable for analysis from a fractal point of view.…”

Section: Introductionmentioning

confidence: 99%

“…Previous work by the author has shown how the application of these fractal analysis procedures are valuable tools not only for characterizing carbonaceous materials but for clarifying the phenomena underlying all the transformations of the materials. Fractal analysis is a complementary tool for analyzing textural characteristics and their evolution for series of oxidized coals [10,11], chars [12] and active carbons [13]. This analysis complements traditional approaches for clarifying the mechanisms of pore development during the steps of coal oxidation, coal carbonization and char activation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Textural changes during CO2 activation of chars: A fractal approach

Mahamud

2007

Applied Surface Science

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“…As a consequence of this, the correlation coefficients for the Friesen's fit are generally low [11][12][13][14][15].…”

Section: Methods Used For the Determination Of Surface Fractal Dimensmentioning

confidence: 97%

Section: Methods Used For the Determination Of Surface Fractal Dimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Textural changes during CO2 activation of chars: A fractal approach

Mahamud

2007

Applied Surface Science

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“…Peitgen and Saupe (1988) presented an exposition of fractal principles; Moore and Krepfl (1991) described the application of fractal principles to the computer synthesis of soil fabrics, and Moore and Donaldson (1995) used fractals to quantify soil microstructure. The pore structures of many materials are of fractal characteristics (Satya Sai and Krishnaiah 2005;Mahamud et al 2003;Thompson et al 1987;Zhang and Li 1995;Sidney 2000;Sean et al 2003), so are soils. If there exist line segments in the pore size distribution between the ratio of the pore volume v(r) of the pore size larger than r to the total pore volume v t and r in the double logarithm coordinate, the relationship between v(r) and r in the line segment is of fractal characteristics.…”

Section: Theory Of Mipmentioning

confidence: 99%

Microstructures of different soil layers caused by the high-rise building group in Shanghai

Cui

Tang

2010

Environ Earth Sci

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The engineering characteristics of soils are controlled by the state of the microstructure of soils to a great extent. With the withdrawal of groundwater controlled reasonably, the engineering-environmental effect of the high-rise building group becomes the main cause of land subsidence in Shanghai. This paper studied the microstructure of each soil layer under the building loads in the centrifuge model by the scanning electron microscopy and the mercury intrusion porosimetry (MIP) for qualitative analysis and quantitative analysis, respectively. The shape, size and contact condition of the basic unit of the soil microstructure were analyzed. The pore structure of each soil layer was studied by MIP, and the pore distribution of each soil layer was studied by the fractal theory. The ink-bottle effect exists in the intrusion stage in the MIP test. There are four different fractal dimensions for silty clay of layer No. 4 and clayey soil of layer No. 8 and three different fractal dimensions for silty sand of layer No. 7 and layer No. 9. The micro and macro mechanisms of land subsidence caused by the high-rise building group were analyzed.

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Correlation between coal and gas outburst risk and adsorption properties of coal seams

Wang

Zou

2019

Energy Science & Engineering

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Based on the Langmuir adsorption model, the adsorption constants of eighteen coal samples from the same coal mine with outburst risk, weak outburst risk, and non‐outburst risk were tested by high‐pressure capacity method under different temperature conditions. The results show that the adsorption constants a and b monotonically decrease with the increase in temperature. The relationship between a and temperature shows three stages: accelerated decreasing stage, decelerated decreasing stage, and stable stage. The b decreases with the increase in temperature also shows three stages, namely relative stability, slow decrease, and accelerated decrease. The a × b for the outburst coal seam decreases with increasing temperature, which is similar to b. The a × b for the weak and non‐outburst coal seams decreases with increasing temperature, which is similar to a. Furthermore, the a of the outburst coal seam decreases with the increase in temperature, and the decrease of b is the largest. The a of the weak and non‐outburst coal seams decreases with the increase in temperature, and the magnitude is relatively large. The b decreases slightly, with a smaller magnitude. The a × b of weak outburst seam is smaller than that of non‐outburst seam and is larger than that of outburst seam. The achievements can provide guiding significance for coal and gas outburst prevention and control.

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Textural characterization of coals using fractal analysis

Cited by 101 publications

References 10 publications

Textural changes during CO2 activation of chars: A fractal approach

Textural changes during CO2 activation of chars: A fractal approach

Microstructures of different soil layers caused by the high-rise building group in Shanghai

Correlation between coal and gas outburst risk and adsorption properties of coal seams

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