Adhesion of alkane as a functional group on muscovite and quartz: dependence on pH and contact time

Klaus Juhl; Christian Schack Pedersen; Nicolas Emile Bovet; Kim Nicole Dalby; Tue Hassenkam; Martin Peter Andersson; Denis Okhrimenko; Susan Louise Svane Stipp

doi:10.1021/la5024967

Adhesion of alkane as a functional group on muscovite and quartz: dependence on pH and contact time

Klaus Juhl^*, Christian Schack Pedersen, Nicolas Emile Bovet, Kim Nicole Dalby, Tue Hassenkam, Martin Peter Andersson, Denis Okhrimenko, Susan Louise Svane Stipp

^*Corresponding author af dette arbejde

Kemisk Institut

14 Citationer (Scopus)

Abstract

The interactions between mineral surfaces and organic molecules in water control many processes in nature and in the production of modern materials. To improve the understanding of fluid-surface interactions, we investigated the interface behavior of quartz and muscovite, a model for clay minerals, in aqueous solutions where the pH and composition were controlled. We used atomic force microscopy (AFM) in chemical force mapping (CFM) mode to measure adhesion using tips functionalized with alkyl, -CH₃. By combining adhesion forces measured as a function of pH, with data from streaming potential experiments and DLVO calculations, we were able to determine the surface charge density. We observed increased adhesion between the mineral surface and the hydrophobic tips as the contact time increased from 7 ms to ?2 s. The di ffusion of dissolved ions takes time, and density functional theory (DFT) calculations did not indicate a strong hydration of the mineral surfaces. Therefore, we interpret that the loss of ions from the confined space between the tip and sample is a likely explanation of the correlation between the dwell time and adhesion. The maximum adhesion increase with dwell time for muscovite, i.e., 400 ± 77 pN, was considerably larger than for quartz, 84 ± 15 pN, which fits with the different surface structure and composition of the two minerals. We propose two mechanisms to explain these results: (1) cations that are structured in the solution and on the surface remain associated at the tip-sample interface initially but diffuse away during extended contact time and (2) adventitious carbon, the organic material that comes spontaneously from air and solution, can diffuse to the tip-sample interface during contact. This material decreases the surface energy by aggregating near the alkyl tip and increases adhesion between the tip and sample.(Figure Presented).

Originalsprog	Engelsk
Tidsskrift	Langmuir
Vol/bind	30
Udgave nummer	48
Sider (fra-til)	14476-14485
Antal sider	10
ISSN	0743-7463
DOI	https://doi.org/10.1021/la5024967
Status	Udgivet - 2014

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10.1021/la5024967

Citationsformater

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title = "Adhesion of alkane as a functional group on muscovite and quartz: dependence on pH and contact time",

abstract = "The interactions between mineral surfaces and organic molecules in water control many processes in nature and in the production of modern materials. To improve the understanding of fluid-surface interactions, we investigated the interface behavior of quartz and muscovite, a model for clay minerals, in aqueous solutions where the pH and composition were controlled. We used atomic force microscopy (AFM) in chemical force mapping (CFM) mode to measure adhesion using tips functionalized with alkyl, -CH3. By combining adhesion forces measured as a function of pH, with data from streaming potential experiments and DLVO calculations, we were able to determine the surface charge density. We observed increased adhesion between the mineral surface and the hydrophobic tips as the contact time increased from 7 ms to ?2 s. The di ffusion of dissolved ions takes time, and density functional theory (DFT) calculations did not indicate a strong hydration of the mineral surfaces. Therefore, we interpret that the loss of ions from the confined space between the tip and sample is a likely explanation of the correlation between the dwell time and adhesion. The maximum adhesion increase with dwell time for muscovite, i.e., 400 ± 77 pN, was considerably larger than for quartz, 84 ± 15 pN, which fits with the different surface structure and composition of the two minerals. We propose two mechanisms to explain these results: (1) cations that are structured in the solution and on the surface remain associated at the tip-sample interface initially but diffuse away during extended contact time and (2) adventitious carbon, the organic material that comes spontaneously from air and solution, can diffuse to the tip-sample interface during contact. This material decreases the surface energy by aggregating near the alkyl tip and increases adhesion between the tip and sample.(Figure Presented).",

author = "Klaus Juhl and Pedersen, {Christian Schack} and Bovet, {Nicolas Emile} and Dalby, {Kim Nicole} and Tue Hassenkam and Andersson, {Martin Peter} and Denis Okhrimenko and Stipp, {Susan Louise Svane}",

year = "2014",

doi = "10.1021/la5024967",

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pages = "14476--14485",

journal = "Langmuir",

issn = "0743-7463",

publisher = "American Chemical Society",

number = "48",

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TY - JOUR

T1 - Adhesion of alkane as a functional group on muscovite and quartz

T2 - dependence on pH and contact time

AU - Juhl, Klaus

AU - Pedersen, Christian Schack

AU - Bovet, Nicolas Emile

AU - Dalby, Kim Nicole

AU - Hassenkam, Tue

AU - Andersson, Martin Peter

AU - Okhrimenko, Denis

AU - Stipp, Susan Louise Svane

PY - 2014

Y1 - 2014

N2 - The interactions between mineral surfaces and organic molecules in water control many processes in nature and in the production of modern materials. To improve the understanding of fluid-surface interactions, we investigated the interface behavior of quartz and muscovite, a model for clay minerals, in aqueous solutions where the pH and composition were controlled. We used atomic force microscopy (AFM) in chemical force mapping (CFM) mode to measure adhesion using tips functionalized with alkyl, -CH3. By combining adhesion forces measured as a function of pH, with data from streaming potential experiments and DLVO calculations, we were able to determine the surface charge density. We observed increased adhesion between the mineral surface and the hydrophobic tips as the contact time increased from 7 ms to ?2 s. The di ffusion of dissolved ions takes time, and density functional theory (DFT) calculations did not indicate a strong hydration of the mineral surfaces. Therefore, we interpret that the loss of ions from the confined space between the tip and sample is a likely explanation of the correlation between the dwell time and adhesion. The maximum adhesion increase with dwell time for muscovite, i.e., 400 ± 77 pN, was considerably larger than for quartz, 84 ± 15 pN, which fits with the different surface structure and composition of the two minerals. We propose two mechanisms to explain these results: (1) cations that are structured in the solution and on the surface remain associated at the tip-sample interface initially but diffuse away during extended contact time and (2) adventitious carbon, the organic material that comes spontaneously from air and solution, can diffuse to the tip-sample interface during contact. This material decreases the surface energy by aggregating near the alkyl tip and increases adhesion between the tip and sample.(Figure Presented).

AB - The interactions between mineral surfaces and organic molecules in water control many processes in nature and in the production of modern materials. To improve the understanding of fluid-surface interactions, we investigated the interface behavior of quartz and muscovite, a model for clay minerals, in aqueous solutions where the pH and composition were controlled. We used atomic force microscopy (AFM) in chemical force mapping (CFM) mode to measure adhesion using tips functionalized with alkyl, -CH3. By combining adhesion forces measured as a function of pH, with data from streaming potential experiments and DLVO calculations, we were able to determine the surface charge density. We observed increased adhesion between the mineral surface and the hydrophobic tips as the contact time increased from 7 ms to ?2 s. The di ffusion of dissolved ions takes time, and density functional theory (DFT) calculations did not indicate a strong hydration of the mineral surfaces. Therefore, we interpret that the loss of ions from the confined space between the tip and sample is a likely explanation of the correlation between the dwell time and adhesion. The maximum adhesion increase with dwell time for muscovite, i.e., 400 ± 77 pN, was considerably larger than for quartz, 84 ± 15 pN, which fits with the different surface structure and composition of the two minerals. We propose two mechanisms to explain these results: (1) cations that are structured in the solution and on the surface remain associated at the tip-sample interface initially but diffuse away during extended contact time and (2) adventitious carbon, the organic material that comes spontaneously from air and solution, can diffuse to the tip-sample interface during contact. This material decreases the surface energy by aggregating near the alkyl tip and increases adhesion between the tip and sample.(Figure Presented).

U2 - 10.1021/la5024967

DO - 10.1021/la5024967

M3 - Journal article

C2 - 25390823

AN - SCOPUS:84915748395

SN - 0743-7463

VL - 30

SP - 14476

EP - 14485

JO - Langmuir

JF - Langmuir

IS - 48

ER -

Adhesion of alkane as a functional group on muscovite and quartz: dependence on pH and contact time

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