Water-based boundary lubrication with biomolecule additives on diamond-like carbon and stainless steel surfaces: Dissertation

    Research output: ThesisDissertationMonograph

    Abstract

    Friction and wear incur high economic costs globally. It has been estimated that approximately 30% of energy is used to overcome friction. Developing new solutions, such as coatings, surface texturing and lubricants, to reduce friction in the boundary lubrication regime can have great importance to global energy savings in the future. In this thesis, water-based lubricants with hydrophobin protein (HFBI, HFBII and FpHYD5) and quince mucilage additives were used to lubricate engineering materials such as diamondlike carbon (DLC) coatings, stainless steels and plastics. It was found that hydrophobins can form monolayers on stainless steel, diamond-like carbon (a-C:H) and PDMS surfaces. On stainless steel surfaces, HFBI and FpHYD5 layers contain 40-64% water. Increasing the water content in hydrophobin film reduced friction in hydrophobin-lubricated stainless steel vs stainless steel contacts. The same effect was seen in quince mucilage-lubricated UHMWPE vs stainless steel contact. The lowest friction coefficients (COF) were measured in FpHYD5 hydrophobin-lubricated contacts where COF as low as 0.03 was measured. Quince mucilage-lubricated UHMWPE vs stainless steel reduced the friction coefficient to as low as 0.02. Of all the tests, the lowest friction coefficients (close to 0.01) were measured with HFBI and FpHYD5 hydrophobins in PDMS vs PDMS contacts. Based on the results, it can be suggested that the requirements for water-based lubrication with biomolecule additives in industrial applications are o A mild temperature range, T= 4 - 95°C o Low contact pressures, 0.1-5 MPa o Hydrophobic surfaces, contact angle of water >90° o Stable conditions (pH, ionic strength) In the future, water-based lubricants could be used in, among others, the food and beverage industry, the textile industry and biomedical applications.
    Original languageEnglish
    QualificationDoctor Degree
    Awarding Institution
    • Aalto University
    Supervisors/Advisors
    • Koskinen, Jari, Supervisor, External person
    • Holmberg, Kenneth, Advisor
    Award date29 Jan 2016
    Publisher
    Print ISBNs978-952-60-6572-4
    Electronic ISBNs978-951-38-8375-1
    Publication statusPublished - 2015
    MoE publication typeG4 Doctoral dissertation (monograph)

    Fingerprint

    Biomolecules
    Lubrication
    Carbon steel
    Diamonds
    Stainless steel
    Friction
    Water
    Lubricants
    Ultrahigh molecular weight polyethylenes
    Coatings
    Carbon
    Beverages
    Texturing
    Textile industry
    Ionic strength
    Water content
    Industrial applications
    Contact angle
    Monolayers
    Energy conservation

    Keywords

    • friction
    • wear
    • hydrophobins
    • quince mucilage
    • water-based lubrication

    Cite this

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    title = "Water-based boundary lubrication with biomolecule additives on diamond-like carbon and stainless steel surfaces: Dissertation",
    abstract = "Friction and wear incur high economic costs globally. It has been estimated that approximately 30{\%} of energy is used to overcome friction. Developing new solutions, such as coatings, surface texturing and lubricants, to reduce friction in the boundary lubrication regime can have great importance to global energy savings in the future. In this thesis, water-based lubricants with hydrophobin protein (HFBI, HFBII and FpHYD5) and quince mucilage additives were used to lubricate engineering materials such as diamondlike carbon (DLC) coatings, stainless steels and plastics. It was found that hydrophobins can form monolayers on stainless steel, diamond-like carbon (a-C:H) and PDMS surfaces. On stainless steel surfaces, HFBI and FpHYD5 layers contain 40-64{\%} water. Increasing the water content in hydrophobin film reduced friction in hydrophobin-lubricated stainless steel vs stainless steel contacts. The same effect was seen in quince mucilage-lubricated UHMWPE vs stainless steel contact. The lowest friction coefficients (COF) were measured in FpHYD5 hydrophobin-lubricated contacts where COF as low as 0.03 was measured. Quince mucilage-lubricated UHMWPE vs stainless steel reduced the friction coefficient to as low as 0.02. Of all the tests, the lowest friction coefficients (close to 0.01) were measured with HFBI and FpHYD5 hydrophobins in PDMS vs PDMS contacts. Based on the results, it can be suggested that the requirements for water-based lubrication with biomolecule additives in industrial applications are o A mild temperature range, T= 4 - 95°C o Low contact pressures, 0.1-5 MPa o Hydrophobic surfaces, contact angle of water >90° o Stable conditions (pH, ionic strength) In the future, water-based lubricants could be used in, among others, the food and beverage industry, the textile industry and biomedical applications.",
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    author = "Hakala, {Timo J.}",
    year = "2015",
    language = "English",
    isbn = "978-952-60-6572-4",
    series = "Aalto University Publication Series: Doctoral Dissertations",
    publisher = "VTT Technical Research Centre of Finland",
    number = "144/2015",
    address = "Finland",
    school = "Aalto University",

    }

    Water-based boundary lubrication with biomolecule additives on diamond-like carbon and stainless steel surfaces : Dissertation. / Hakala, Timo J.

    VTT Technical Research Centre of Finland, 2015. 166 p.

    Research output: ThesisDissertationMonograph

    TY - THES

    T1 - Water-based boundary lubrication with biomolecule additives on diamond-like carbon and stainless steel surfaces

    T2 - Dissertation

    AU - Hakala, Timo J.

    PY - 2015

    Y1 - 2015

    N2 - Friction and wear incur high economic costs globally. It has been estimated that approximately 30% of energy is used to overcome friction. Developing new solutions, such as coatings, surface texturing and lubricants, to reduce friction in the boundary lubrication regime can have great importance to global energy savings in the future. In this thesis, water-based lubricants with hydrophobin protein (HFBI, HFBII and FpHYD5) and quince mucilage additives were used to lubricate engineering materials such as diamondlike carbon (DLC) coatings, stainless steels and plastics. It was found that hydrophobins can form monolayers on stainless steel, diamond-like carbon (a-C:H) and PDMS surfaces. On stainless steel surfaces, HFBI and FpHYD5 layers contain 40-64% water. Increasing the water content in hydrophobin film reduced friction in hydrophobin-lubricated stainless steel vs stainless steel contacts. The same effect was seen in quince mucilage-lubricated UHMWPE vs stainless steel contact. The lowest friction coefficients (COF) were measured in FpHYD5 hydrophobin-lubricated contacts where COF as low as 0.03 was measured. Quince mucilage-lubricated UHMWPE vs stainless steel reduced the friction coefficient to as low as 0.02. Of all the tests, the lowest friction coefficients (close to 0.01) were measured with HFBI and FpHYD5 hydrophobins in PDMS vs PDMS contacts. Based on the results, it can be suggested that the requirements for water-based lubrication with biomolecule additives in industrial applications are o A mild temperature range, T= 4 - 95°C o Low contact pressures, 0.1-5 MPa o Hydrophobic surfaces, contact angle of water >90° o Stable conditions (pH, ionic strength) In the future, water-based lubricants could be used in, among others, the food and beverage industry, the textile industry and biomedical applications.

    AB - Friction and wear incur high economic costs globally. It has been estimated that approximately 30% of energy is used to overcome friction. Developing new solutions, such as coatings, surface texturing and lubricants, to reduce friction in the boundary lubrication regime can have great importance to global energy savings in the future. In this thesis, water-based lubricants with hydrophobin protein (HFBI, HFBII and FpHYD5) and quince mucilage additives were used to lubricate engineering materials such as diamondlike carbon (DLC) coatings, stainless steels and plastics. It was found that hydrophobins can form monolayers on stainless steel, diamond-like carbon (a-C:H) and PDMS surfaces. On stainless steel surfaces, HFBI and FpHYD5 layers contain 40-64% water. Increasing the water content in hydrophobin film reduced friction in hydrophobin-lubricated stainless steel vs stainless steel contacts. The same effect was seen in quince mucilage-lubricated UHMWPE vs stainless steel contact. The lowest friction coefficients (COF) were measured in FpHYD5 hydrophobin-lubricated contacts where COF as low as 0.03 was measured. Quince mucilage-lubricated UHMWPE vs stainless steel reduced the friction coefficient to as low as 0.02. Of all the tests, the lowest friction coefficients (close to 0.01) were measured with HFBI and FpHYD5 hydrophobins in PDMS vs PDMS contacts. Based on the results, it can be suggested that the requirements for water-based lubrication with biomolecule additives in industrial applications are o A mild temperature range, T= 4 - 95°C o Low contact pressures, 0.1-5 MPa o Hydrophobic surfaces, contact angle of water >90° o Stable conditions (pH, ionic strength) In the future, water-based lubricants could be used in, among others, the food and beverage industry, the textile industry and biomedical applications.

    KW - friction

    KW - wear

    KW - hydrophobins

    KW - quince mucilage

    KW - water-based lubrication

    M3 - Dissertation

    SN - 978-952-60-6572-4

    T3 - Aalto University Publication Series: Doctoral Dissertations

    PB - VTT Technical Research Centre of Finland

    ER -