Comparative properties of siloxane vs phosphonate monolayers on a key titanium alloy

Brett M. Silverman; Kristen A. Wieghaus; Jeffrey Schwartz

doi:10.1021/la0482271

Comparative properties of siloxane vs phosphonate monolayers on a key titanium alloy

Brett M. Silverman, Kristen A. Wieghaus, Jeffrey Schwartz

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

202 Scopus citations

Abstract

A direct comparison of surface loading, interface shear strength, and interface hydrolytic stability was made between a phosphonate and two siloxane monolayers formed on the native oxide surface of Ti-6Al-4V. Surface loading for the phosphonate was ca. four times greater (on a nanomole/area basis) than for the siloxanes; mechanical strengths per surface-bound molecule were comparable, but the hydrolytic stability (pH 7.5) of the siloxanes was poor. These results suggest that phosphonate monolayer interfaces are more desirable than comparable siloxane ones for applications where such interfaces contact even slightly alkaline water.

Original language	English (US)
Pages (from-to)	225-228
Number of pages	4
Journal	Langmuir
Volume	21
Issue number	1
DOIs	https://doi.org/10.1021/la0482271
State	Published - Jan 4 2005

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Spectroscopy
General Materials Science
Surfaces and Interfaces
Electrochemistry

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10.1021/la0482271

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abstract = "A direct comparison of surface loading, interface shear strength, and interface hydrolytic stability was made between a phosphonate and two siloxane monolayers formed on the native oxide surface of Ti-6Al-4V. Surface loading for the phosphonate was ca. four times greater (on a nanomole/area basis) than for the siloxanes; mechanical strengths per surface-bound molecule were comparable, but the hydrolytic stability (pH 7.5) of the siloxanes was poor. These results suggest that phosphonate monolayer interfaces are more desirable than comparable siloxane ones for applications where such interfaces contact even slightly alkaline water.",

author = "Silverman, {Brett M.} and Wieghaus, {Kristen A.} and Jeffrey Schwartz",

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AU - Wieghaus, Kristen A.

AU - Schwartz, Jeffrey

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N2 - A direct comparison of surface loading, interface shear strength, and interface hydrolytic stability was made between a phosphonate and two siloxane monolayers formed on the native oxide surface of Ti-6Al-4V. Surface loading for the phosphonate was ca. four times greater (on a nanomole/area basis) than for the siloxanes; mechanical strengths per surface-bound molecule were comparable, but the hydrolytic stability (pH 7.5) of the siloxanes was poor. These results suggest that phosphonate monolayer interfaces are more desirable than comparable siloxane ones for applications where such interfaces contact even slightly alkaline water.

AB - A direct comparison of surface loading, interface shear strength, and interface hydrolytic stability was made between a phosphonate and two siloxane monolayers formed on the native oxide surface of Ti-6Al-4V. Surface loading for the phosphonate was ca. four times greater (on a nanomole/area basis) than for the siloxanes; mechanical strengths per surface-bound molecule were comparable, but the hydrolytic stability (pH 7.5) of the siloxanes was poor. These results suggest that phosphonate monolayer interfaces are more desirable than comparable siloxane ones for applications where such interfaces contact even slightly alkaline water.

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Comparative properties of siloxane vs phosphonate monolayers on a key titanium alloy

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