Physical Chemistry of Surfaces

Yariv, S.; Cross, Harold

doi:10.1007/978-3-642-67041-1_3

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Diffusion is a phenomenon involving the irregular thermal movement of molecules (Adamson 1990). The pore size of the porous medium and the gas molecular mean free path Fig.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal

Ren

et al. 2019

Arab J Geosci

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A self-developed gas desorption and diffusion experimental system was used to conduct isothermal methane gas desorption and diffusion experiments, and the pore structure of coal samples was analyzed. A new mathematical model for gas diffusion in coal particles was established, and the diffusion coefficient was calculated using the new model. The influences of particle size and the adsorption equilibrium pressure on the methane gas diffusion rate, gas diffusion quantity, and diffusion coefficient were analyzed and discussed. The results show that under different adsorption equilibrium pressures and different particle sizes, the diffusion rate and quantity vary substantially. The larger the particle size, the slower the initial gas diffusion rate and the longer the time required to reach desorption equilibrium. The larger the adsorption pressure, the greater the initial gas diffusion rate and the larger the quantity of diffusion gas accumulated. However, the coal particle size has little influence on the amount of gas diffusion. It was found that as the particle size decreases, the diffusion coefficient in the first diffusion phase is significantly reduced, which decays with a negative exponential function over time. However, the adsorption equilibrium pressure has no obvious influence on the diffusion coefficient. In addition, the methane gas diffusion process was divided into three phases, namely, phase I, rapid diffusion phase (0-10 min); phase II, slow diffusion phase (10-100 min); and phase III, smooth diffusion phase (100 min); and the diffusion mechanism corresponding to each phase was analyzed. These research results provide a theoretical and practical reference value for gas prevention and control in coal mines. Keywords Gas desorption and diffusion . Mathematical model . Coal particle size . Adsorption equilibrium pressure . Diffusion coefficient . Three phases of gas diffusion This article is part of the Topical Collection on Mine Safety Science and Engineering Electronic supplementary material The online version of this article (

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“…Diffusion is a phenomenon involving the irregular thermal movement of molecules (Adamson 1990). The pore size of the porous medium and the gas molecular mean free path Fig.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal

Ren

et al. 2019

Arab J Geosci

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“…Therefore, to simplify the model, Q 1 is excluded from the calculation. Q 2 is generated from intermolecular interactions, including Keesom force, Debye force, London dispersion force and repulsive force, and it is one or two orders of magnitude smaller than chemical bonding energy, reaching thousands of kJ/mol [24,25]. According to quantum-mechanical theories, molecular attraction is inversely proportional to the sixth power of the intermolecular distance, while molecular repulsive force is inversely proportional to the 12th power of the distance between molecules [26].…”

Section: Water Binding Energy Calculation Modelmentioning

confidence: 99%

Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge

Mao

Zhao

Zhang

et al. 2020

Water

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The dewatering of dredged sludge is a critical step in the minimization and reutilization of this solid waste. However, there is a lack of available literature on the fundamental drying characteristics of dredged sludge. In this work, two kinds of typical sludge dredged from an urban watercourse were tested by low-field NMR to investigate the water distribution in sludge and it was found that water contained in sludge can be classified into three categories: free water, capillary water and bound water. In addition, a novel model was proposed based on the Lennard-Jones equation and Kelvin law to quantitatively evaluate the binding energy during drying. Further, the model results were experimentally verified by thermogravimetry differential thermal analysis (TG-DTA). Results show that the trends of the model are consistent with the experimental values and the gradient of energy consumption during dehydration can be divided into three main stages. In stage 1, the total energy required for dewatering equals the latent heat of free water. In stage 2, binding energy reaches dozens to hundreds of kJ/kg accounting for capillary action. In stage 3, binding energy increases steeply reaching almost thousands of kJ/kg due to intermolecular interactions. All the discovered aspects could improve the management and disposal of dredged sludge from an energy cost perspective.

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Study on the Friction and Wear Properties of PEEK against Cortical Bone Tissue Under Different Lubricating Conditions

Zhang

Lin

et al. 2023

Macromolecular Bioscience

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The tribological behavior between orthopedic implants and cortical bone is important but usually neglected. Poly(ether‐ether‐ketone) (PEEK) is a promising material for orthopedic applications. To further understand and improve the interfacial tribological properties between PEEK implant and host bone tissue, a PEEK‐cortical bone tribo‐pair is designed and fabricated. The frictional and wear performance of such tribo‐pair is investigated under different lubricants, i.e., simulated body fluid (SBF), calf serum (CS), hyaluronic acid (HA), and mucin (MUC). The results suggest that MUC solution can be utilized as an artificial natural synovial fluid to improve the tribological properties of PEEK‐based implants.

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Physical Chemistry of Surfaces

Cited by 5 publications

References 40 publications

Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal

Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal

Measurement and Modelling of Moisture Distribution and Water Binding Energy of Dredged Sludge

Study on the Friction and Wear Properties of PEEK against Cortical Bone Tissue Under Different Lubricating Conditions

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