Structure Analysis of Interface between DLC Film and Water by Neutron Reflectometry

Structure Analysis of Interface between DLC Film and Water by Neutron Reflectometry

Density of lubricant at near solid surface is measured by neutron reflectometry and discussed in the series of studies. In this paper, three kinds of DLC films having different surface energies (normal DLC, hydrophilic DLC and hydrophobic DLC) were prepared as base materials, and water was selected...

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Veröffentlicht in:Dōshisha Daigaku Rikogaku Kenkyu Hokoku 2008-01, Vol.48 (4), p.52-58
Hauptverfasser: Hirayama, Tomoko, Uno, Tomoki, Matsuoka, Takashi, Ebisawa, Torn, Tasaki, Seiji, Hino, Masahiro, Torikai, Naoya
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container_issue 4
container_start_page 52
container_title Dōshisha Daigaku Rikogaku Kenkyu Hokoku
container_volume 48
creator Hirayama, Tomoko
Uno, Tomoki
Matsuoka, Takashi
Ebisawa, Torn
Tasaki, Seiji
Hino, Masahiro
Torikai, Naoya
description Density of lubricant at near solid surface is measured by neutron reflectometry and discussed in the series of studies. In this paper, three kinds of DLC films having different surface energies (normal DLC, hydrophilic DLC and hydrophobic DLC) were prepared as base materials, and water was selected as a lubricant. The instrument we used was a neutron reflectometer 'MINE' in Japan Atomic Energy Agency (JAEA). The DLC films were soaked in water in an original sample holder, and the neutron reflectivity profiles were directly obtained from the interface between DLC films and water. Through an analytical fitting approach with the Parratt's theory to the obtained profiles, we can see that: (1) the thickness of hydrophilic layer (02 plasma treated layer) on the hydrophilic DLC is 15nm, (2) the thickness of dense water layer infiltrating in hydrophilic DLC is 2nm, and (3) the thickness of low-density water layer on the surface of hydrophobic DLC is 3nm, and its density is almost half of normal water.
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