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 = "VTT Science",
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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 - VTT Science

PB - VTT Technical Research Centre of Finland

ER -