Surface Fractal Dimension of Perovskite‐Doped Alumina Membrane: Influence of Calcining Temperature

Ahmad, A.L.; Idrus, N; Shukor, Syamsul Rizal Abd

doi:10.1111/j.1551-2916.2006.00964.x

Cited by 15 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The properties of the toplayer, calcined at 450 C are shown in Table 1. The surface fractal dimension D f of membrane is not given, therefore an average value of 2.4 reported by Ahmad et al (2006) is used here.…”

Section: Model Validationmentioning

confidence: 99%

A new formulation of apparent permeability for gas transport in shale

Zhang

et al. 2015

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

Section: Model Validationmentioning

confidence: 99%

A new formulation of apparent permeability for gas transport in shale

Zhang

et al. 2015

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

“…The fractal dimension de scribes how an object fills its space, 40 or measures the sur face roughness, 41,42 and heterogeneity or irregularity. 42 Ac cording to Eucledian geometry, D s = 0 represents a point; D s = 1 represents a curve; D s = 2 represents a surface; and D s = 3 represents a volume.…”

Section: Appendix Amentioning

confidence: 99%

Impact of Porogens on the Pore Characteristics of Zirconia Particles Made by Polymer-Induced Colloid Aggregation

Pattanayak

Subramanian

2009

International Journal of Applied Ceramic Technology

View full text Add to dashboard Cite

Zirconia particles were prepared from a 20% colloidal sol (ZrO2) by the polymer‐induced colloid aggregation (PICA) process, both in the presence and absence of porogens. Specifically, porous zirconia particles having varying porosity were prepared by a two‐step protocol wherein a porogen was first embedded during the particle synthesis, followed by its removal in a subsequent step. In this research study, the ability of four different types of porogens, viz. fumed silica, micronized high molecular weight polyethylene emulsion ME09730, and microcrystalline waxes ME48040M2 and ME98040M1, to impact the pore size, porosity, and pore area were investigated. Particle morphology and porosity of the resultant particles were characterized by scanning electron microscopy, mercury intrusion–extrusion porosimetry, and the nitrogen adsorption–desorption sorptometry. Optimal ratios of zirconia sol and porogen to yield the largest unimodal distribution of pores were determined. Porous zirconia particles were obtained after the removal of porogen, followed by a calcination and sintering protocol. Particle aggregates were typically 7–45 μm in diameter, with BET surface areas between 21 and 54 m2/g and pores ranging from 18 to 120 nm in diameter. The nitrogen sorptometry and mercury porosimetry data of these support particles were modeled to calculate surface fractal dimension, pore accessibility parameters, pore network, and pore geometry.

show abstract

“…The FHH model was used in this research, and the calculation equation of FHH model could be described as below (Ahmad et al 2006): where V and Vo are the volume of the sorbed gas at equilibrium pressure and monolayer coverage [cm 3 /g, standard temperature and pressure (STP)], respectively; K is the…”

Section: Calculation Of the Fractal Dimensionmentioning

confidence: 99%

Fractal characteristics and significances of the nanopores in oil shales during hydrous pyrolysis

Sun

Chai

et al. 2019

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

In order to explore the pore characterizations in shales during organic matter evolution, a series of simulation experiments were conducted. The artificial hydrous pyrolysis was conducted on the same seven columned oil-shale samples at 250 °C, 300 °C, 350 °C, 375 °C, 400 °C, 450 °C and 500 °C, respectively. To obtain the characteristics of pore structures in shales, the unheated and the residual solid samples were analyzed by low-pressure nitrogen adsorption method. Based on the nitrogen adsorption isotherms, fractal dimensions were calculated by the model of Frenkel-Halsey-Hill, which also contained the fractal dimension of D 1 and D 2 before and after the relative pressure P/Po = 0.5, respectively. And then the relationships of simulation temperatures (thermal maturity), total-, macro-, meso-and micro-pores volumes, specific surface areas and diameters to fractal dimensions were investigated. The results showed that the average value of D 2 (2.6110) was higher than D 1 (2.4147) and there was a positive relationship between them (R 2 = 0.9237), which indicated that though D 2 and D 1 were more related to pore structures and surfaces, the better linear relationships suggested that both of them could be used in the representation of pore structures and surfaces in shales. With the thermal maturity increasing, the obvious fractal characteristics were, the complexity of pore structures were, which may be associated with the following cause-and-effect relationships. During the pyrolysis, the generation of hydrocarbons increased, as well as the consumption of TOC may increase the volume and surface area of total-, macro-, meso-and micro-pores but decrease the corresponding average diameter and then the quantities of smaller pores occurred and led to the strengthening of pore heterogeneity in shales. Based on the fractal characteristics, we also found the higher thermal maturity would result in the better connections among pores but worse permeability in shale, which further increased the gas adsorption quantity. Therefore, analyzing the fractal characteristics in shales could provide help for clarifying the characteristics of reservoirs as well as the comprehensive exploration and development of shale gas.

show abstract

Surface Fractal Dimension of Perovskite‐Doped Alumina Membrane: Influence of Calcining Temperature

Cited by 15 publications

References 21 publications

A new formulation of apparent permeability for gas transport in shale

A new formulation of apparent permeability for gas transport in shale

Impact of Porogens on the Pore Characteristics of Zirconia Particles Made by Polymer-Induced Colloid Aggregation

Fractal characteristics and significances of the nanopores in oil shales during hydrous pyrolysis

Contact Info

Product

Resources

About