Surface microtopography of surfactant modified montmorillonite

Low-pressure gas adsorption experiments and Atomic Force Microscopy (AFM) were used to investigate the microtopography of surfactant modified montmorillonites. These two methods not only permit measurement of the specific surface area, mapping the images of surfactant modified montmorillonites on th...

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Published inApplied clay science Vol. 45; no. 1; pp. 70 - 75
Main Authors Zhu, Jianxi, Zhu, Lizhong, Zhu, Runliang, Tian, Senlin, Li, Jiwu
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier B.V 01.06.2009
Elsevier
Subjects
AFM
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fractal dimension
Microtopography
Mineralogy
Montmorillonite
Silicates
Surfactant
Microtopography
AFM
Montmorillonite
Fractal dimension
Surfactant
experimental studies
models
adsorption
cation exchange capacity
nitrogen
fractal dimension
low pressure
isotherms
loading
specific surface
heterogeneity
smectite
fractals
montmorillonite
roughness
hills
clay minerals
sheet silicates
silicates
Online AccessGet full text
ISSN0169-1317
1872-9053
DOI10.1016/j.clay.2009.04.010

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Abstract Low-pressure gas adsorption experiments and Atomic Force Microscopy (AFM) were used to investigate the microtopography of surfactant modified montmorillonites. These two methods not only permit measurement of the specific surface area, mapping the images of surfactant modified montmorillonites on the nano-scale, but also provide the possibility to determine surface roughness and irregularities. The fractal Frenkel–Halsey–Hill model ( D F ) and Neimark–Kiselev model ( D N ) were applied to quantitatively evaluate the heterogeneities of organo-montmorillonite surface by analyzing low-pressure nitrogen gas adsorption isotherms at 77 K. When the dosage of surfactant, expressed as a function of the cation exchange capacity (CEC), increased from 0.2 to 4 CEC, the fractal dimensions changed from D F = 2.88 to 2.59 and D N = 2.58 to 2.12, reflecting that the surface roughness of montmorillonite was influenced by surfactant loading. Higher surfactant loading caused smoother surfaces, which was consistent with the AFM observation.
AbstractList Low-pressure gas adsorption experiments and Atomic Force Microscopy (AFM) were used to investigate the microtopography of surfactant modified montmorillonites. These two methods not only permit measurement of the specific surface area, mapping the images of surfactant modified montmorillonites on the nano-scale, but also provide the possibility to determine surface roughness and irregularities. The fractal Frenkel–Halsey–Hill model ( D F ) and Neimark–Kiselev model ( D N ) were applied to quantitatively evaluate the heterogeneities of organo-montmorillonite surface by analyzing low-pressure nitrogen gas adsorption isotherms at 77 K. When the dosage of surfactant, expressed as a function of the cation exchange capacity (CEC), increased from 0.2 to 4 CEC, the fractal dimensions changed from D F = 2.88 to 2.59 and D N = 2.58 to 2.12, reflecting that the surface roughness of montmorillonite was influenced by surfactant loading. Higher surfactant loading caused smoother surfaces, which was consistent with the AFM observation.
Low-pressure gas adsorption experiments and Atomic Force Microscopy (AFM) were used to investigate the microtopography of surfactant modified montmorillonites. These two methods not only permit measurement of the specific surface area, mapping the images of surfactant modified montmorillonites on the nano-scale, but also provide the possibility to determine surface roughness and irregularities. The fractal Frenkel-Halsey- Hill model (D(F)) and Neimark-Kiselev model (D(N)) were applied to quantitatively evaluate the heterogeneities of organo-montmorillonite surface by analyzing low-pressure nitrogen gas adsorption isotherms at 77 K. When the dosage of surfactant, expressed as a function of the cation exchange capacity (CEC), increased from 0.2 to 4 CEC, the fractal dimensions changed from D(F) = 2.88 to 2.59 and D(N) = 2.58 to 2.12, reflecting that the surface roughness of montmorillonite was influenced by surfactant loading. Higher surfactant loading caused smoother surfaces, which was consistent with the AFM observation.
Author Tian, Senlin
Zhu, Jianxi
Zhu, Runliang
Li, Jiwu
Zhu, Lizhong
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  givenname: Lizhong
  surname: Zhu
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Issue 1
Keywords Microtopography
AFM
Montmorillonite
Fractal dimension
Surfactant
experimental studies
models
adsorption
cation exchange capacity
nitrogen
fractal dimension
low pressure
isotherms
loading
specific surface
heterogeneity
smectite
fractals
montmorillonite
roughness
hills
clay minerals
sheet silicates
silicates
Language English
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Snippet Low-pressure gas adsorption experiments and Atomic Force Microscopy (AFM) were used to investigate the microtopography of surfactant modified montmorillonites....
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SubjectTerms AFM
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fractal dimension
Microtopography
Mineralogy
Montmorillonite
Silicates
Surfactant
Title Surface microtopography of surfactant modified montmorillonite
URI https://dx.doi.org/10.1016/j.clay.2009.04.010
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