Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers

Hui Xin He; Hua Zhang; Yin Chuan Wang; Zhong Fan Liu

doi:10.1080/10587259908023437

Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers

Hui Xin He, Hua Zhang, Yin Chuan Wang, Zhong Fan Liu

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Chemical force microscopy (CFM) was used to follow the dissociation process of 4-mercaptopyridine (4-MP) self-assembled monolayers (SAMs) on gold. The force probe was an Au-coated Si₃N₄ tip modified with 4-MP SAM. The adhesion force between tip and substrate was found to be a function of solution pH. The pK_1/2 value of surface pyridyl groups of 4-MP SAM obtained from force titration curve was 5.4, remarkably different from the conventional contact angle titration result (pK_1/2=3.3). This difference is believed to arise from the difference in spatial resolution of two approaches. The force titration would probe the local dissociation properties of surface groups, while the contact angle titration reflects the average dissociation properties underneath the water droplet.

Original language	English (US)
Pages (from-to)	301-304
Number of pages	4
Journal	Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume	337
DOIs	https://doi.org/10.1080/10587259908023437
State	Published - 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

Keywords

Chemical force titration
Contact angle titration
Surface pK

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10.1080/10587259908023437

Cite this

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title = "Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers",

abstract = "Chemical force microscopy (CFM) was used to follow the dissociation process of 4-mercaptopyridine (4-MP) self-assembled monolayers (SAMs) on gold. The force probe was an Au-coated Si3N4 tip modified with 4-MP SAM. The adhesion force between tip and substrate was found to be a function of solution pH. The pK1/2 value of surface pyridyl groups of 4-MP SAM obtained from force titration curve was 5.4, remarkably different from the conventional contact angle titration result (pK1/2=3.3). This difference is believed to arise from the difference in spatial resolution of two approaches. The force titration would probe the local dissociation properties of surface groups, while the contact angle titration reflects the average dissociation properties underneath the water droplet.",

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T1 - Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers

AU - He, Hui Xin

AU - Zhang, Hua

AU - Wang, Yin Chuan

AU - Liu, Zhong Fan

PY - 1999

Y1 - 1999

N2 - Chemical force microscopy (CFM) was used to follow the dissociation process of 4-mercaptopyridine (4-MP) self-assembled monolayers (SAMs) on gold. The force probe was an Au-coated Si3N4 tip modified with 4-MP SAM. The adhesion force between tip and substrate was found to be a function of solution pH. The pK1/2 value of surface pyridyl groups of 4-MP SAM obtained from force titration curve was 5.4, remarkably different from the conventional contact angle titration result (pK1/2=3.3). This difference is believed to arise from the difference in spatial resolution of two approaches. The force titration would probe the local dissociation properties of surface groups, while the contact angle titration reflects the average dissociation properties underneath the water droplet.

AB - Chemical force microscopy (CFM) was used to follow the dissociation process of 4-mercaptopyridine (4-MP) self-assembled monolayers (SAMs) on gold. The force probe was an Au-coated Si3N4 tip modified with 4-MP SAM. The adhesion force between tip and substrate was found to be a function of solution pH. The pK1/2 value of surface pyridyl groups of 4-MP SAM obtained from force titration curve was 5.4, remarkably different from the conventional contact angle titration result (pK1/2=3.3). This difference is believed to arise from the difference in spatial resolution of two approaches. The force titration would probe the local dissociation properties of surface groups, while the contact angle titration reflects the average dissociation properties underneath the water droplet.

KW - Chemical force titration

KW - Contact angle titration

KW - Surface pK

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JO - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals

ER -

Chemical force titration of conjugated pyridyl group-terminated self-assembled monolayers

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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