High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces

Igor Sîretanu, Aram Harold Klaassen, Daniel Ebeling, M.P. Andersson, Fei Liu, Henricus T.M. van den Ende, Friedrich Gunther Mugele

Research output: Contribution to conferencePosterAcademic

Abstract

The solid-liquid interface and electrostatic interactions in solution is a quite complex topic. It is known for playing an extremely important role in determining molecular structure and binding activity, since almost all surfaces become charged by a variety of mechanisms when they come in contact with an aqueous medium. A typical picture with such a charged surface is that small ions of opposite sign accumulate in its immediate neighborhood, resulting in the formation of an electric double layer (EDL). Depending on the local solid-liquid and liquid-liquid molecular interactions, the interfacial liquid does not behave like a bulk liquid, often exhibiting higher densification and ordering that strongly depend on the local properties of the solid surface. However, experimental research remains challenging due to the lack of techniques offering sufficient resolution over inhomogeneous surfaces. Herein, unprecedented high resolution measurements of the ion adsorption and charge distribution on composite silicon oxide/gibbsite nanoplatelet surfaces using atomic force spectroscopy with sharp tips will be presented. FM-AFM spectroscopy results allow us to determine the local surface charge with a lateral resolution in the 10 nm range and to identify specific ion effects. Ultrahigh resolution AM-AFM images reflect the solvation structure of the interfacial liquid. Unlike Na+ and K+ ions, divalent ions like Ca2+ and Mg2+ modify and fully define the interface probed by AFM tip, consequently confirming their strong absorption to the surface
Original languageEnglish
Publication statusPublished - 22 Jul 2018
EventWater and Aqueous Solutions: Gordon Research Conference 2018: Water: Driving Life, Medicine, Energy and Environment - Holderness School, Holderness, United States
Duration: 22 Jul 201827 Jul 2018

Conference

ConferenceWater and Aqueous Solutions: Gordon Research Conference 2018
CountryUnited States
CityHolderness
Period22/07/1827/07/18

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Charge distribution
Clay minerals
Ions
Imaging techniques
Adsorption
Liquids
Spectroscopy
Molecular interactions
Silicon oxides
Solvation
Surface charge
Coulomb interactions
Densification
Molecular structure
Composite materials

Cite this

Sîretanu, I., Klaassen, A. H., Ebeling, D., Andersson, M. P., Liu, F., van den Ende, H. T. M., & Mugele, F. G. (2018). High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces. Poster session presented at Water and Aqueous Solutions: Gordon Research Conference 2018, Holderness, United States.
Sîretanu, Igor ; Klaassen, Aram Harold ; Ebeling, Daniel ; Andersson, M.P. ; Liu, Fei ; van den Ende, Henricus T.M. ; Mugele, Friedrich Gunther. / High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces. Poster session presented at Water and Aqueous Solutions: Gordon Research Conference 2018, Holderness, United States.
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abstract = "The solid-liquid interface and electrostatic interactions in solution is a quite complex topic. It is known for playing an extremely important role in determining molecular structure and binding activity, since almost all surfaces become charged by a variety of mechanisms when they come in contact with an aqueous medium. A typical picture with such a charged surface is that small ions of opposite sign accumulate in its immediate neighborhood, resulting in the formation of an electric double layer (EDL). Depending on the local solid-liquid and liquid-liquid molecular interactions, the interfacial liquid does not behave like a bulk liquid, often exhibiting higher densification and ordering that strongly depend on the local properties of the solid surface. However, experimental research remains challenging due to the lack of techniques offering sufficient resolution over inhomogeneous surfaces. Herein, unprecedented high resolution measurements of the ion adsorption and charge distribution on composite silicon oxide/gibbsite nanoplatelet surfaces using atomic force spectroscopy with sharp tips will be presented. FM-AFM spectroscopy results allow us to determine the local surface charge with a lateral resolution in the 10 nm range and to identify specific ion effects. Ultrahigh resolution AM-AFM images reflect the solvation structure of the interfacial liquid. Unlike Na+ and K+ ions, divalent ions like Ca2+ and Mg2+ modify and fully define the interface probed by AFM tip, consequently confirming their strong absorption to the surface",
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Sîretanu, I, Klaassen, AH, Ebeling, D, Andersson, MP, Liu, F, van den Ende, HTM & Mugele, FG 2018, 'High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces' Water and Aqueous Solutions: Gordon Research Conference 2018, Holderness, United States, 22/07/18 - 27/07/18, .

High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces. / Sîretanu, Igor ; Klaassen, Aram Harold; Ebeling, Daniel; Andersson, M.P.; Liu, Fei; van den Ende, Henricus T.M.; Mugele, Friedrich Gunther.

2018. Poster session presented at Water and Aqueous Solutions: Gordon Research Conference 2018, Holderness, United States.

Research output: Contribution to conferencePosterAcademic

TY - CONF

T1 - High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces

AU - Sîretanu, Igor

AU - Klaassen, Aram Harold

AU - Ebeling, Daniel

AU - Andersson, M.P.

AU - Liu, Fei

AU - van den Ende, Henricus T.M.

AU - Mugele, Friedrich Gunther

PY - 2018/7/22

Y1 - 2018/7/22

N2 - The solid-liquid interface and electrostatic interactions in solution is a quite complex topic. It is known for playing an extremely important role in determining molecular structure and binding activity, since almost all surfaces become charged by a variety of mechanisms when they come in contact with an aqueous medium. A typical picture with such a charged surface is that small ions of opposite sign accumulate in its immediate neighborhood, resulting in the formation of an electric double layer (EDL). Depending on the local solid-liquid and liquid-liquid molecular interactions, the interfacial liquid does not behave like a bulk liquid, often exhibiting higher densification and ordering that strongly depend on the local properties of the solid surface. However, experimental research remains challenging due to the lack of techniques offering sufficient resolution over inhomogeneous surfaces. Herein, unprecedented high resolution measurements of the ion adsorption and charge distribution on composite silicon oxide/gibbsite nanoplatelet surfaces using atomic force spectroscopy with sharp tips will be presented. FM-AFM spectroscopy results allow us to determine the local surface charge with a lateral resolution in the 10 nm range and to identify specific ion effects. Ultrahigh resolution AM-AFM images reflect the solvation structure of the interfacial liquid. Unlike Na+ and K+ ions, divalent ions like Ca2+ and Mg2+ modify and fully define the interface probed by AFM tip, consequently confirming their strong absorption to the surface

AB - The solid-liquid interface and electrostatic interactions in solution is a quite complex topic. It is known for playing an extremely important role in determining molecular structure and binding activity, since almost all surfaces become charged by a variety of mechanisms when they come in contact with an aqueous medium. A typical picture with such a charged surface is that small ions of opposite sign accumulate in its immediate neighborhood, resulting in the formation of an electric double layer (EDL). Depending on the local solid-liquid and liquid-liquid molecular interactions, the interfacial liquid does not behave like a bulk liquid, often exhibiting higher densification and ordering that strongly depend on the local properties of the solid surface. However, experimental research remains challenging due to the lack of techniques offering sufficient resolution over inhomogeneous surfaces. Herein, unprecedented high resolution measurements of the ion adsorption and charge distribution on composite silicon oxide/gibbsite nanoplatelet surfaces using atomic force spectroscopy with sharp tips will be presented. FM-AFM spectroscopy results allow us to determine the local surface charge with a lateral resolution in the 10 nm range and to identify specific ion effects. Ultrahigh resolution AM-AFM images reflect the solvation structure of the interfacial liquid. Unlike Na+ and K+ ions, divalent ions like Ca2+ and Mg2+ modify and fully define the interface probed by AFM tip, consequently confirming their strong absorption to the surface

M3 - Poster

ER -

Sîretanu I, Klaassen AH, Ebeling D, Andersson MP, Liu F, van den Ende HTM et al. High resolution AFM imaging of ion adsorption and charge distribution at heterogeneous clay mineral-liquid interfaces. 2018. Poster session presented at Water and Aqueous Solutions: Gordon Research Conference 2018, Holderness, United States.