pH Dependent Elasticity of Polystyrene-blockpoly(acrylic acid) Vesicle Shell Membranes by Atomic Force Microscopy

Qi Chen; Gyula J. Vancso

doi:10.1002/marc.201100332

pH Dependent Elasticity of Polystyrene-blockpoly(acrylic acid) Vesicle Shell Membranes by Atomic Force Microscopy

Qi Chen, Gyula J. Vancso

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13 Citations (Scopus)

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Abstract

We assess the elastic properties of PS-b-PAA vesicle membranes under different pH values by AFM force measurements. We find that based on the shell deformation theory, the values of the estimated apparent Young's modulus of the vesicle membranes decrease as the pH of the solution increases. The onset of the decrease of E coincides with the surface pKa determined from ζ-potential measurements. This decrease of E at higher pH is attributed to electrostatic repulsion between the deprotonated PAA chains resulting in the thinning of the vesicle membrane.

Original language	Undefined
Pages (from-to)	1704-1709
Number of pages	6
Journal	Macromolecular rapid communications
Volume	32
Issue number	21
DOIs	https://doi.org/10.1002/marc.201100332
Publication status	Published - 2011

Keywords

METIS-280496
IR-104472

Access to Document

10.1002/marc.201100332

Cite this

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title = "pH Dependent Elasticity of Polystyrene-blockpoly(acrylic acid) Vesicle Shell Membranes by Atomic Force Microscopy",

abstract = "We assess the elastic properties of PS-b-PAA vesicle membranes under different pH values by AFM force measurements. We find that based on the shell deformation theory, the values of the estimated apparent Young's modulus of the vesicle membranes decrease as the pH of the solution increases. The onset of the decrease of E coincides with the surface pKa determined from ζ-potential measurements. This decrease of E at higher pH is attributed to electrostatic repulsion between the deprotonated PAA chains resulting in the thinning of the vesicle membrane.",

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AU - Vancso, Gyula J.

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N2 - We assess the elastic properties of PS-b-PAA vesicle membranes under different pH values by AFM force measurements. We find that based on the shell deformation theory, the values of the estimated apparent Young's modulus of the vesicle membranes decrease as the pH of the solution increases. The onset of the decrease of E coincides with the surface pKa determined from ζ-potential measurements. This decrease of E at higher pH is attributed to electrostatic repulsion between the deprotonated PAA chains resulting in the thinning of the vesicle membrane.

AB - We assess the elastic properties of PS-b-PAA vesicle membranes under different pH values by AFM force measurements. We find that based on the shell deformation theory, the values of the estimated apparent Young's modulus of the vesicle membranes decrease as the pH of the solution increases. The onset of the decrease of E coincides with the surface pKa determined from ζ-potential measurements. This decrease of E at higher pH is attributed to electrostatic repulsion between the deprotonated PAA chains resulting in the thinning of the vesicle membrane.

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KW - IR-104472

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DO - 10.1002/marc.201100332

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