Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density.

Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density. Research Abstract Details 

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Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density. Abstract Text:

Feng Li, Pincet,Feng Li, Pincet,Feng Li, Pincet,Feng Li, Pincet,

End-tethered polymer chains usually adopt mushroomlike structures on the surface when their density is low. The behaviors of these surface-attached hemicoils are described by existing polymer theory. Dolan and Edwards derived the free energy of a single polymer chain confined between two planar surfaces. Their theory was used to approximate the steric interaction free energy, E, of two identical surfaces bearing polymers in the mushroom regime and to compare with experimental data obtained from surface force measurements. However, because of a mislabeled plot in the original paper, experimental force profiles did not seem to fit the free energy approximation satisfactorily. We have correctly relabeled the involved plot and derived a new simple expression for E. In order to verify this expression, we have performed experiments on PEG45 polymers incorporated in lipid bilayers using a surface force apparatus. The measured force profiles are in perfect agreement with the prediction. We show that such measurements can be used to determine the local density of grafted polymer with good precision.

Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density. Publishing Authors By Initials

F Li,F Pincet,F Li,F Pincet,F Li,F Pincet,F Li,F Pincet,

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Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 23

Page Numbers: 12541-8

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ISSN: 0743-7463

DAY: 8

MONTH: 11

YEAR: 2007

Confinement free energy of surfaces bearing end-grafted polymers in the mushroom regime and local measurement of the polymer density. Information

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LANGUAGE: eng

NlmUniqueID: 9882736

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AFFILIATION: Laboratoire de Physique Statistique de l'Ecole Normale Supérieure, associé aux Universités Paris 6 et Paris 7, CNRS UMR 8550, 24 rue Lhomond, 75005 Paris, France.

Country: United States

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MEDLINETA: Langmuir

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