Fractal Surface Analysis by Using Nitrogen Adsorption Data:  The Case of the Capillary Condensation Regime

Sahouli, Bendida; Blacher, Silvia; Brouers, F.

doi:10.1021/la950877p

Cited by 61 publications

(36 citation statements)

References 13 publications

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“…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

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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.

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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

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“…Fractal dimension parameters derived from FHH and thermodynamic methods are related to mineralogy, pore volume, and surface area, with fractal dimension values derived from thermodynamic methods being systematically higher compared to that obtained via FHH. The experimental disagreement might root in the sensitivity of the FHH equation towards microporous structures (Sahouli et al, 1996).…”

Section: Relationships Between Fractal Dimension and Thermal Maturitymentioning

confidence: 99%

Fractal Characteristics of Shales Across a Maturation Gradient

Chen

Zou

et al. 2015

Acta Geologica Sinica - English Edition

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“…Previous studies indicate that the FHH and 524 NK methods can be equivalent (Jaroniec, 1995;Sahouli et al, 1996). 525 526 25 527…”

Section: Introduction 26 27mentioning

confidence: 99%

Uranium-series comminution ages of continental sediments: Case study of a Pleistocene alluvial fan

Lee

DePaolo

Christensen

2010

Earth and Planetary Science Letters

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1 2Obtaining quantitative information about the timescales associated with sediment transport, 3 storage, and deposition in continental settings is important but challenging. The uranium-series 4 comminution age method potentially provides a universal approach for direct dating of 5 Quaternary detrital sediments, and can also provide estimates of the sediment transport and 6 storage timescales. (The word "comminution" means "to reduce to powder," reflecting the start 7 of the comminution age clock as reduction of lithic parent material below a critical grain size 8 threshold of ~50 m.) To test the comminution age method as a means to date continental 9 sediments, we applied the method to drill-core samples of the glacially-derived Kings River Fan 10 alluvial deposits in central California. Sediments from the 45 m core have independently-11 estimated depositional ages of up to ~800 ka, based on paleomagnetism and correlations to 12 nearby dated sediments. We characterized sequentially-leached core samples (both bulk 13 sediment and grain size separates) for U, Nd, and Sr isotopes, grain size, surface texture, and 14 mineralogy. In accordance with the comminution age model, where 234 U is partially lost from 15 small (<50 µm) sediment grains due to alpha recoil, we found that ( 234 U/ 238 U) activity ratios 16 *Manuscript Click here to view linked References 2 generally decrease with age, depth, and specific surface area, with depletions of up to 9% relative 17 to radioactive equilibrium. The resulting calculated comminution ages are reasonable, although 18 they do not exactly match age estimates from previous studies and also depend on assumptions 19 about 234 U loss rates. The results indicate that the method may be a significant addition to the 20 sparse set of available tools for dating detrital continental sediments, following further 21 refinement. Improving the accuracy of the method requires more advanced models or 22 measurements for both the recoil loss factor f  and weathering effects. We discuss several 23 independent methods for obtaining f  on individual samples that may be useful for future studies. 24

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Fractal Surface Analysis by Using Nitrogen Adsorption Data: The Case of the Capillary Condensation Regime

Cited by 61 publications

References 13 publications

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

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

Fractal Characteristics of Shales Across a Maturation Gradient

Uranium-series comminution ages of continental sediments: Case study of a Pleistocene alluvial fan

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