Silane Treatment of Diamond-Like Carbon: Improvement of Hydrophobicity, Oleophobicity, and Humidity Tolerance of Friction

Ala Alazizi, David Smith, Ali Erdemir, Seong Kim

Research output: Contribution to journalArticle

Abstract

Hydrophobicity and humidity tolerance of the low friction behavior of hydrogenated diamond-like carbon (H-DLC) were improved via surface modification using vapor-phase chemical reactions with organic silanes at 250–280 °C. Water and hexadecane contact angles increased after silane treatments. Unlike pristine H-DLC which loses ultra-low friction behavior as soon as relative humidity (RH) increases to a few percent, silane-treated H-DLC films maintained a low friction behavior (with a coefficient less than 0.08) up to 30 % RH. Elemental analysis of the transfer films accumulated on the balls after friction tests indicated that the silane molecules not only decorated the topmost surface of the H-DLC, but also penetrated into and reacted with the subsurface. Surface roughness, water adsorption behavior, and hardness measurements also showed that silane treatment affected the surface morphology and subsurface porosity of the H-DLC film.

Original languageEnglish (US)
Article number43
JournalTribology Letters
Volume63
Issue number3
DOIs
StatePublished - Sep 1 2016

Fingerprint

Silanes
Diamond
Hydrophobicity
hydrophobicity
silanes
humidity
Diamonds
Atmospheric humidity
friction
Carbon
diamonds
Friction
carbon
Diamond like carbon films
Water
water
Contact angle
Surface morphology
Surface treatment
balls

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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title = "Silane Treatment of Diamond-Like Carbon: Improvement of Hydrophobicity, Oleophobicity, and Humidity Tolerance of Friction",
abstract = "Hydrophobicity and humidity tolerance of the low friction behavior of hydrogenated diamond-like carbon (H-DLC) were improved via surface modification using vapor-phase chemical reactions with organic silanes at 250–280 °C. Water and hexadecane contact angles increased after silane treatments. Unlike pristine H-DLC which loses ultra-low friction behavior as soon as relative humidity (RH) increases to a few percent, silane-treated H-DLC films maintained a low friction behavior (with a coefficient less than 0.08) up to 30 {\%} RH. Elemental analysis of the transfer films accumulated on the balls after friction tests indicated that the silane molecules not only decorated the topmost surface of the H-DLC, but also penetrated into and reacted with the subsurface. Surface roughness, water adsorption behavior, and hardness measurements also showed that silane treatment affected the surface morphology and subsurface porosity of the H-DLC film.",
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Silane Treatment of Diamond-Like Carbon : Improvement of Hydrophobicity, Oleophobicity, and Humidity Tolerance of Friction. / Alazizi, Ala; Smith, David; Erdemir, Ali; Kim, Seong.

In: Tribology Letters, Vol. 63, No. 3, 43, 01.09.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Silane Treatment of Diamond-Like Carbon

T2 - Improvement of Hydrophobicity, Oleophobicity, and Humidity Tolerance of Friction

AU - Alazizi, Ala

AU - Smith, David

AU - Erdemir, Ali

AU - Kim, Seong

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AB - Hydrophobicity and humidity tolerance of the low friction behavior of hydrogenated diamond-like carbon (H-DLC) were improved via surface modification using vapor-phase chemical reactions with organic silanes at 250–280 °C. Water and hexadecane contact angles increased after silane treatments. Unlike pristine H-DLC which loses ultra-low friction behavior as soon as relative humidity (RH) increases to a few percent, silane-treated H-DLC films maintained a low friction behavior (with a coefficient less than 0.08) up to 30 % RH. Elemental analysis of the transfer films accumulated on the balls after friction tests indicated that the silane molecules not only decorated the topmost surface of the H-DLC, but also penetrated into and reacted with the subsurface. Surface roughness, water adsorption behavior, and hardness measurements also showed that silane treatment affected the surface morphology and subsurface porosity of the H-DLC film.

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