Surface Composition of a Series of Dimethylsiloxane Urea Urethane Segmented Copolymers Studied by Electron Spectroscopy for Chemical Analysis

Xin Chen; Joseph A. Gardella; Tai Ho; Kenneth J. Wynne

doi:10.1021/ma00109a041

Surface Composition of a Series of Dimethylsiloxane Urea Urethane Segmented Copolymers Studied by Electron Spectroscopy for Chemical Analysis

Macromolecules ◽

10.1021/ma00109a041 ◽

1995 ◽

Vol 28 (5) ◽

pp. 1635-1642 ◽

Cited By ~ 59

Author(s):

Xin Chen ◽

Joseph A. Gardella ◽

Tai Ho ◽

Kenneth J. Wynne

Keyword(s):

Chemical Analysis ◽

Electron Spectroscopy ◽

Surface Composition ◽

Segmented Copolymers

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Surface Composition of Fluorinated Poly(amide urethane) Block Copolymers by Electron Spectroscopy for Chemical Analysis

Macromolecules ◽

10.1021/ma950860d ◽

1996 ◽

Vol 29 (5) ◽

pp. 1660-1665 ◽

Cited By ~ 16

Author(s):

Hengzhong Zhuang ◽

Kacey Gribbin Marra ◽

Tai Ho ◽

Toby M. Chapman ◽

Joseph A. Gardella

Keyword(s):

Block Copolymers ◽

Chemical Analysis ◽

Electron Spectroscopy ◽

Surface Composition

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Determination of the surface composition of lead electrode membranes by electron spectroscopy for chemical analysis

Analytical Chemistry ◽

10.1021/ac00236a024 ◽

1981 ◽

Vol 53 (13) ◽

pp. 2048-2053 ◽

Cited By ~ 17

Author(s):

Sunetra N. Kar. Chaudhari ◽

F. C. Chang ◽

K. L. Cheng ◽

V. Y. Young

Keyword(s):

Chemical Analysis ◽

Electron Spectroscopy ◽

Surface Composition ◽

Lead Electrode

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Surface composition and morphology of polyimidesiloxane copolymers with short polydimethylsiloxane segments studied by electron spectroscopy for chemical analysis and time-of-flight secondary ion mass spectrometry

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films ◽

10.1116/1.581457 ◽

1998 ◽

Vol 16 (5) ◽

pp. 3046-3051 ◽

Cited By ~ 11

Author(s):

Jin Zhao ◽

Sergio R. Rojstaczer ◽

Joseph A. Gardella

Keyword(s):

Mass Spectrometry ◽

Chemical Analysis ◽

Electron Spectroscopy ◽

Secondary Ion Mass Spectrometry ◽

Surface Composition ◽

Time Of Flight ◽

Ion Mass Spectrometry ◽

Secondary Ion

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The Dissolution and Passivation of a Single-Crystal Ni50Fe50 Alloy and the Influence of Sulfur Studied by Electron Spectroscopy for Chemical Analysis

CORROSION ◽

10.5006/1.3584890 ◽

1986 ◽

Vol 42 (2) ◽

pp. 91-98 ◽

Cited By ~ 28

Author(s):

P. Marcus ◽

I. Olefjord

Keyword(s):

Chemical Analysis ◽

Single Crystal ◽

Passive Film ◽

Electron Spectroscopy ◽

Surface Composition ◽

Oxide Surface ◽

Nickel Concentration ◽

Potential Range ◽

Iron Hydroxides ◽

Adsorbed Sulfur

Abstract Surface composition changes that occur during the dissolution and passivation of a single-crystal Ni50Fe50 (100) alloy were investigated by electron spectroscopy for chemical analysis (ESCA). When the alloy is exposed to sulfuric acid (0.05 M), the nickel concentration on the surface increases from 50 to 85%. This enrichment of nickel on the surface is also found after dissolution of the alloy in the active region. The passive film is formed by a nickel oxide layer on the alloy surface, with nickel and iron hydroxides on the oxide surface. Alloys containing sulfur in solid solution exhibit a completely different electrochemical and corrosion behavior. Sulfur segregates on the surface during dissolution of the alloy. A monolayer of sulfur present on the surface hinders the formation of the passive film. Further accumulation of sulfur on the surface causes the formation of nickel sulfide islands. These sulfide islands grow and cover ∼ 30% of the surface, and the rest of the surface is covered by adsorbed sulfur. The passive film cannot be formed on this surface, and the alloy is actively corroded in the potential range where a sulfur-free alloy is normally passivated.

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