Diamond-Like Carbon: A Surface for Extreme, High-Wear Environments

N. Sharifi; H. Smith; D. Madden; T. Kehoe; G. Wu; L. Yang; R. J.L. Welbourn; E. G Fernandez; S. M. Clarke

doi:10.1021/acs.langmuir.3c01438

Diamond-Like Carbon: A Surface for Extreme, High-Wear Environments

N. Sharifi, H. Smith, D. Madden, T. Kehoe, G. Wu, L. Yang, R. J.L. Welbourn, E. G Fernandez, S. M. Clarke

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

Abstract

In this study, we present an in-depth characterization of a diamond-like carbon (DLC) film, using a range of techniques to understand the structure and chemistry of the film both in the interior and particularly at the DLC/air surface and DLC/liquid interface. The DLC film is found to be a combination of sp² and sp³ carbon, with significant oxygen present at the surface. The oxygen seems to be present as OH groups, making the DLC somewhat hydrophilic. Quartz-Crystal Microbalance (QCM) isotherms and complementary neutron reflectivity data indicate significant adsorption of a model additive, bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) surfactant, onto the DLC from water solutions and indicate the adsorbed film is a bilayer. This initial study of the structure and composition of a model surfactant is intended to give a clearer insight into how DLC and additives function as antiwear systems.

Original language	English
Pages (from-to)	52-61
Number of pages	10
Journal	Langmuir
Volume	40
Issue number	1
DOIs	https://doi.org/10.1021/acs.langmuir.3c01438
State	Published - Jan 9 2024
Externally published	Yes

Funding

The authors acknowledge funding and technical support from BP, through the BP. International Centre for Advanced Materials (bp-ICAM) and EPSRC through the prosperity partnership (EP/G036850/1) and Royce facility grant (EP/R02524X/1), as well as the ISIS staff and scientists for the allocation of beam time and technical assistance with NR measurements (10.5286/ISIS.E.RB2210025). XMaS is a U.K. national research facility supported by EPSRC. We are grateful to all the beamline team staff for their support.

Funders	Funder number
BP
Engineering and Physical Sciences Research Council	EP/R02524X/1, EP/G036850/1

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title = "Diamond-Like Carbon: A Surface for Extreme, High-Wear Environments",

abstract = "In this study, we present an in-depth characterization of a diamond-like carbon (DLC) film, using a range of techniques to understand the structure and chemistry of the film both in the interior and particularly at the DLC/air surface and DLC/liquid interface. The DLC film is found to be a combination of sp2 and sp3 carbon, with significant oxygen present at the surface. The oxygen seems to be present as OH groups, making the DLC somewhat hydrophilic. Quartz-Crystal Microbalance (QCM) isotherms and complementary neutron reflectivity data indicate significant adsorption of a model additive, bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) surfactant, onto the DLC from water solutions and indicate the adsorbed film is a bilayer. This initial study of the structure and composition of a model surfactant is intended to give a clearer insight into how DLC and additives function as antiwear systems.",

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AU - Wu, G.

AU - Yang, L.

AU - Welbourn, R. J.L.

AU - G Fernandez, E.

AU - Clarke, S. M.

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AB - In this study, we present an in-depth characterization of a diamond-like carbon (DLC) film, using a range of techniques to understand the structure and chemistry of the film both in the interior and particularly at the DLC/air surface and DLC/liquid interface. The DLC film is found to be a combination of sp2 and sp3 carbon, with significant oxygen present at the surface. The oxygen seems to be present as OH groups, making the DLC somewhat hydrophilic. Quartz-Crystal Microbalance (QCM) isotherms and complementary neutron reflectivity data indicate significant adsorption of a model additive, bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) surfactant, onto the DLC from water solutions and indicate the adsorbed film is a bilayer. This initial study of the structure and composition of a model surfactant is intended to give a clearer insight into how DLC and additives function as antiwear systems.

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Diamond-Like Carbon: A Surface for Extreme, High-Wear Environments

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