Article
Chemistry, Multidisciplinary
Yury Villagran-Zaccardi, Natalia Alderete, Philip van den Heede, Nele De Belie
Summary: Eco-friendly concrete mixtures efficiently use constituents for durable structures; ternary mixes have a good balance of environmental impact, cost, and performance; pore structure analysis is valuable for predicting durability, with no significant effects of GGBFS and limestone powder observed.
APPLIED SCIENCES-BASEL
(2021)
Article
Agricultural Engineering
Jing Qian, Jingjing Gao, Zhengbin He, Songlin Yi
Summary: The study evaluated the density and pore structure characteristics of self-shrinking Ailanthus altissima substrate obtained by ultrasonic-assisted treatment, revealing changes in the wood density and pore structure after treatment. Samples treated with 1% and 4% NaOH showed higher density but lower porosity compared to water-immersion samples, with an increase in the relative content of macropores.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Energy & Fuels
Linlin Wang, Zhengjiang Long, Yu Song, Zhenghui Qu
Summary: This study investigates the characteristics of supercritical CO2 adsorption/desorption on coals with different tectonic deformations and their effects on pore structure and fractal characteristics. The results show that CO2 adsorption and desorption isotherms exhibit multiple extremes and negative adsorption. The specific surface area of transition pores affects the adsorption peak values at low pressure, while the development of ultra-micropores controls the adsorption capacity at high pressure. Moreover, the desorption deviation is influenced by the fractal characteristics of pores.
Article
Energy & Fuels
Qian Li, Dameng Liu, Yidong Cai, Yingfang Zhou, Tingting Yin
Summary: This study established a multidimensional description of nanopores in high volatile bituminous coal and anthracite using gas adsorption and FIB-SEM experiments. The nanopore structure significantly affects the adsorption capacity of methane, mainly through micropore structure, pore morphology, and heterogeneity.
Article
Geosciences, Multidisciplinary
Shasha Zhang, Huan Liu, Zhehui Jin, Caifang Wu
Summary: This study investigated the pore heterogeneity of coal using different methods and analyzed the multifractal characteristics of coal pore structures. The results revealed that the heterogeneity and complexity of pore structures increase with the coalification degree.
NATURAL RESOURCES RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Fuyong Wang, Yun Zai
Summary: This paper characterizes the pore structure of shales using high-pressure mercury intrusion (HPMI) test, fractal theory, and multifractal theory, revealing that fractal dimension can be a key index for evaluating the complexity of shale nanopores. Additionally, the multifractal parameters provide insights into the size, concentration, and asymmetry of pore size distribution in shale nanopores.
RESULTS IN PHYSICS
(2021)
Article
Energy & Fuels
Fengli Li, Bo Jiang, Yu Song, Guoxi Cheng, Guanwen Lu
Summary: The study found that the pore volume and surface area distributions of micro- and mesopores in tectonically deformed coals exhibit multifractal characteristics, with the multifractal dimensions providing quantitative measures of heterogeneity and continuity. Changes in pore structure related to coal deformation significantly influence the multifractal properties of pore volume and surface area distributions. The methane adsorption properties of coal are significantly correlated with the multifractal dimensions of pore size distributions, particularly 1-10 nm pores.
Article
Soil Science
Jocenei A. T. de Oliveira, Fabio A. M. Cassaro, Luiz F. Pires
Summary: This study used X-ray micro-tomography images and a computational algorithm based on mercury intrusion porosimetry to evaluate the impact of different agricultural management systems (CT, MT, NT) on soil structure. The results showed significant changes in pore size distribution under CT and MT, with CT and NT being the main drivers of changes in soil porosity. The computational algorithm proved valuable for quantifying pore size distribution and modifications induced by different management systems.
SOIL & TILLAGE RESEARCH
(2021)
Article
Energy & Fuels
Jiangfeng Guo, Bryce MacMillan, Mohammad Sadegh Zamiri, Bruce J. Balcom
Summary: 1H magnetic resonance is a useful tool for studying the molecular structure of coals. Two-dimensional relaxation correlation methods were used to evaluate different types of coals and analyze the changes in hydrogen content during low temperature oxidation. Significant differences between low rank and high rank coals were captured, providing new insights into coal behavior.
Article
Energy & Fuels
Kun Zhang, Zhaoping Meng, Shimin Liu
Summary: The isosteric heat of adsorption is a key parameter for assessing the thermodynamic properties of gas adsorption and migration in coals. Results from isotherm experiments show that Langmuir V-L in coal is dependent on temperature and coal structures, and adsorption heat is higher in intact coals than in deformed coals. Additionally, diffusion coefficients decrease with depressurization processes, and gas diffusion mainly occurs in different pore sizes corresponding to Fick's, transitional, and Knudsen diffusion. The high initial diffusion coefficient in deformed coals is related to the low isosteric heat of adsorption.
Article
Forestry
Dessie T. Tibebu, Stavros Avramidis
Summary: Understanding the fractal dimension of wood pores is essential for studying its macroscopic properties. This research used the pore size distribution to explore the fractal dimension of softwoods and hardwoods. The results revealed significant differences in pore size distribution and fractal dimension values for different pore sizes.
Article
Materials Science, Ceramics
Claudia Voigt, Alina Schramm, Jana Hubalkova, Nora Brachhold, Herbert Giesche, Christos G. Aneziris
Summary: Carbon-bonded alumina samples with different compositions and mixing and shaping procedures were tested for their densities, porosities, and pore entryway diameter distributions. Most samples showed no release of mercury during pressure reduction, but a constant cumulative volume. Samples without carbon binder and uninitiated carbon binder showed an extrusion of mercury causing a hysteresis curve.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Construction & Building Technology
Jing Cao, Fangyi Liu, Siyang Huang, Cheng Kong, Huafeng Sun, Yue Gao, Fuhua Liu, Jianyun Li, Guoshou Liu
Summary: This study investigates the impact of soil containing humic acid (HA) on the strength of cement-soil through unconfined compressive strength (UCS) tests and microscopic experiments. The results indicate that the addition of HA decreases the strength of cement-soil and alters the failure mode to plastic failure.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Energy & Fuels
Quanlin Yang, Junhua Xue, Wei Li, Xuanhong Du, Qian Ma, Keliang Zhan, Zhiheng Chen
Summary: Accurate characterization of coal pore structure is essential for understanding gas storage and migration mechanisms. This study used fractal theory and the new Tait equation method to analyze MIP data of coal, finding that simultaneous interparticle void filling affects 1.9-3.4% of total intrusion volumes, while matrix compression can account for 46.72-80.41%. When combined with low pressure N2 gas adsorption, the TE method provides TPV values closer to the BJH model for pore sizes in the range of 33-320 nm, while the MC method is more suitable for correcting smaller pore sizes in MIP data.
Article
Construction & Building Technology
Jiashun Shi, Qing Chun, Yunsheng Zhang, Dafu Wang, Zhiyong Liu, Hui Jin, Cheng Liu, Guojian Liu, Rusheng Qian
Summary: Permeability is a fundamental property of cement-based materials and can be predicted by examining the material's pore size distribution. The random hierarchical bundle model is a promising approach for estimating permeability, but the original model neglected the slippage effect during gas penetration. In this study, a modified model that considers this effect was proposed, and the permeability of cement-based materials can be directly predicted using the pore size distribution obtained via mercury intrusion porosimetry. The results showed that this modified model accurately predicts permeability for various mortars and concretes, and can also predict permeability for different gases and porous media.
CONSTRUCTION AND BUILDING MATERIALS
(2023)