Adsorption of Quadrupolar, Diatomic Nitrogen onto Graphitized Thermal Carbon Black and in Slit-Shaped Carbon Pores. Effects of Surface Mediation

In this paper, we study the effect of solid surface mediation on the intermolecular potential energy of nitrogen, and its impact on the adsorption of nitrogen on a graphitized carbon black surface and in carbon slit-shaped pores. This effect arises from the lower effective interaction potential energy between two particles close to the surface compared to the potential energy of the same two particles when they are far away from the surface. A simple equation is proposed to calculate the reduction factor and this is used in the Grand Canonical Monte Carlo (GCMC) simulation of nitrogen adsorption on graphitized thermal carbon black. With this modification, the GCMC simulation results agree extremely well with the experimental data over a wide range of pressure; the simulation results with the original potential energy (i.e. no surface mediation) give rise to a shoulder in the neighbourhood of monolayer coverage and a significant over-prediction of the second and higher layer coverages. The influence of this surface mediation on the dependence of the pore-filling pressure on the pore width is also studied. It is shown that such surface mediation has a significant effect on the pore-filling pressure. This implies that the use of the local isotherms obtained from the potential model without surface mediation could give rise to a serious error in the determination of the pore-size distribution.

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Effects of Graphene Layer Size on the Adsorption of Fluids on Graphitized Thermal Carbon Black. A Computer Simulation Study

Adsorption Science & Technology ◽

10.1260/026361706778812835 ◽

2006 ◽

Vol 24 (3) ◽

pp. 193-204 ◽

Cited By ~ 3

Author(s):

P. Luangkiattikhun ◽

A. Wongkoblap ◽

D.D. Do

Keyword(s):

Adsorption Isotherm ◽

Carbon Black ◽

Crystallite Size ◽

Surface Area ◽

Graphene Layer ◽

Graphite Surface ◽

Surface Model ◽

Damping Factor ◽

Graphitized Thermal Carbon Black ◽

Gcmc Simulation

The adsorption of Lennard-Jones fluids (argon and nitrogen) onto a graphitized thermal carbon black surface was studied with a Grand Canonical Monte Carlo Simulation (GCMC). The surface was assumed to be finite in length and composed of three graphene layers. When the GCMC simulation was used to describe adsorption on a graphite surface, an over-prediction of the isotherm was consistently observed in the pressure regions where the first and second layers are formed. To remove this over-prediction, surface mediation was accounted for to reduce the fluid–fluid interaction. Do and co-workers have introduced the so-called surface-mediation damping factor to correct the over-prediction for the case of a graphite surface of infinite extent, and this approach has yielded a good description of the adsorption isotherm. In this paper, the effects of the finite size of the graphene layer on the adsorption isotherm and how these would affect the extent of the surface mediation were studied. It was found that this finite-surface model provides a better description of the experimental data for graphitized thermal carbon black of high surface area (i.e. small crystallite size) while the infinite-surface model describes data for carbon black of very low surface area (i.e. large crystallite size).

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Adsorption of Water and Methanol on Highly Graphitized Thermal Carbon Black and Activated Carbon Fibre

Australian Journal of Chemistry ◽

10.1071/ch15134 ◽

2015 ◽

Vol 68 (9) ◽

pp. 1336 ◽

Cited By ~ 10

Author(s):

Toshihide Horikawa ◽

Masanori Takenouchi ◽

Duong D. Do ◽

Ken-Ichiro Sotowa ◽

J. Rafael Alcántara-Avila ◽

...

Keyword(s):

Activated Carbon ◽

Carbon Black ◽

Carbon Fibre ◽

Hysteresis Loop ◽

Functional Groups ◽

Relative Pressure ◽

Graphitized Thermal Carbon Black ◽

Wide Range ◽

Adsorption Of Water ◽

Activated Carbon Fibre

Adsorption of water and methanol on different carbonaceous solids was carried out to investigate the roles of porous structure and functional groups on the adsorption of associating fluids. A highly graphitized thermal carbon black, non-porous Carbopack F, was chosen to study the effects of functional groups and their concentration, and two samples of porous activated carbon fibre (ACF), microporous A-5 and micro-mesoporous A-15, were used to investigate the interplay between the functional groups and confinement. On Carbopack F, adsorption of water at 298 K is not experimentally detectable until the relative pressure reaches about 0.9, and the adsorption isotherm exhibits a large hysteresis loop spanning a very wide range of pressure; by contrast methanol adsorption at the same temperature shows an onset of adsorption at a lower relative pressure of 0.2 and the isotherm has a very small hysteresis loop. This early onset, compared with water, is due to the dispersion interaction between the methyl group and the graphene surface; an interaction which is absent in water. For the porous ACF samples, the onset of water uptake shifts from a relative pressure of 0.9; as observed for Carbopack F, to the much lower values, depending on pore size, of 0.3 for microporous A-5 and 0.5 for micro-mesoporous A-15.

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Adsorption of flexible n-alkane on graphitized thermal carbon black: analysis of adsorption isotherm by means of GCMC simulation

Chemical Engineering Science ◽

10.1016/j.ces.2004.12.009 ◽

2005 ◽

Vol 60 (7) ◽

pp. 1977-1986 ◽

Cited By ~ 21

Author(s):

D.D. Do ◽

H.D. Do

Keyword(s):

Adsorption Isotherm ◽

Carbon Black ◽

Graphitized Thermal Carbon Black ◽

Gcmc Simulation

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HIGH-ACCURATE INTERMOLECULAR POTENTIAL ENERGY SURFACE OF HCN−H2 COMPLEX WITH INTRAMOLECULAR VIBRATIONAL MODE OF HCN INCLUDED

Proceedings of the 71st International Symposium on Molecular Spectroscopy ◽

10.15278/isms.2016.wa08 ◽

2016 ◽

Author(s):

Yu Zhai ◽

Hui Li

Keyword(s):

Potential Energy ◽

Potential Energy Surface ◽

Energy Surface ◽

Vibrational Mode ◽

Intermolecular Potential

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Realization of a fractional-order RLC circuit via constant phase element

International Journal of Dynamics and Control ◽

10.1007/s40435-021-00778-4 ◽

2021 ◽

Author(s):

Riccardo Caponetto ◽

Salvatore Graziani ◽

Emanuele Murgano

Keyword(s):

Experimental Data ◽

Carbon Black ◽

Fractional Order ◽

Constant Phase Element ◽

Polymeric Matrix ◽

Fractional Order Systems ◽

New Device ◽

Rlc Circuit ◽

Simulation Results

AbstractIn the paper, a fractional-order RLC circuit is presented. The circuit is realized by using a fractional-order capacitor. This is realized by using carbon black dispersed in a polymeric matrix. Simulation results are compared with the experimental data, confirming the suitability of applying this new device in the circuital implementation of fractional-order systems.

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Design and Evaluation of Large-Scale IoT-Enabled Healthcare Architecture

Applied Sciences ◽

10.3390/app11083623 ◽

2021 ◽

Vol 11 (8) ◽

pp. 3623

Author(s):

Omar Said ◽

Amr Tolba

Keyword(s):

Packet Loss ◽

Large Scale ◽

Performance Metrics ◽

Medical System ◽

Healthcare Data ◽

High Altitude Platforms ◽

Wide Range ◽

Simulation Results ◽

Healthcare Architecture ◽

The Internet Of Things

Employment of the Internet of Things (IoT) technology in the healthcare field can contribute to recruiting heterogeneous medical devices and creating smart cooperation between them. This cooperation leads to an increase in the efficiency of the entire medical system, thus accelerating the diagnosis and curing of patients, in general, and rescuing critical cases in particular. In this paper, a large-scale IoT-enabled healthcare architecture is proposed. To achieve a wide range of communication between healthcare devices, not only are Internet coverage tools utilized but also satellites and high-altitude platforms (HAPs). In addition, the clustering idea is applied in the proposed architecture to facilitate its management. Moreover, healthcare data are prioritized into several levels of importance. Finally, NS3 is used to measure the performance of the proposed IoT-enabled healthcare architecture. The performance metrics are delay, energy consumption, packet loss, coverage tool usage, throughput, percentage of served users, and percentage of each exchanged data type. The simulation results demonstrate that the proposed IoT-enabled healthcare architecture outperforms the traditional healthcare architecture.

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