Biomimetic approach to water lubrication with biomolecular additives

Ahlroos, Tiina; Hakala, Timo J.; Helle, Aino; Holmberg, Kenneth; Mahlberg, Riitta; Laaksonen, Päivi; Varjus, Simo

doi:10.1177/1350650111406635

Cited by 16 publications

(15 citation statements)

References 25 publications

(38 reference statements)

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“…12,14 It has been observed that hydrophobins are able to reduce friction and wear of stainless steel surfaces when compared to water or buffer solutions without any additive molecules. Hydrophobins are small globular (diameter, y3 nm) amphiphilic proteins that are known to have a high tendency to adhere to surfaces and interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…One additive type that can be used to enhance the lubrication properties of water is biomolecules. [11][12][13][14] In nature, biomolecules, such as proteins, phospholipids and carbohydrates, are used to form lubricating systems with friction coefficients as low as 0?001. 15 Some of these molecules have been successfully applied as lubricants on artificial surfaces and engineering materials 16,17 under relatively low contact pressures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of operational conditions and environment on lubricity of hydrophobins in water based lubrication systems

Hakala

Laaksonen

Helle

et al. 2014

Tribology - Materials, Surfaces & Interfaces

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In this study, the effect of operational conditions (normal load, sliding velocity) and environment (pH and ionic strength) on the lubrication properties of two different hydrophobin proteins were investigated using pin on disc tribometry and ellipsometry. The studied proteins were wild type HFBI and the glycosylated hydrophobin FpHYD5. It was observed that the friction of a stainless steel versus stainless steel contact lubricated with either of the hydrophobins did not depend on the normal load. However, increased sliding velocity occasionally led to a decrease in friction when the surfaces were lubricated with the glycosylated FpHYD5. The tribological behaviour of FpHYD5 was studied at pH values ranging from 3 to 9 and generally lowered friction by 31-38% and wear by 40-65% compared to the corresponding buffer solutions. An exception was pH 9, where FpHYD5 increased friction and wear compared to the buffer solution. Ionic strength affected both the amount of protein that was adsorbed and the lubrication properties of glycosylated hydrophobins.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of operational conditions and environment on lubricity of hydrophobins in water based lubrication systems

Hakala

Laaksonen

Helle

et al. 2014

Tribology - Materials, Surfaces & Interfaces

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“…However, plastic shear of the surface asperities is fairly probable for the two hard tribopairs, POM-POM and steel-glass. According to Greenwood and Williamson [35], for an exponential asperity distribution, (3) where E′, σ, H and Rasp is the reduced Young's modulus, the roughness, the hardness and the average asperity radius of tribopair (for dissimilar material tribocontact, σ, H and Rasp of the softer material from the two materials in contact are used in the equation), a dimensionless plasticity index (ψ) can be introduced as a guideline for plastic shear of surface asperities; the contact will be elastic if ψ < ~0.69 and plastic (or fracture for brittle materials) if ψ > ~0.69. It is noted that ψ is independent of load.…”

Section: Hard Interfacesmentioning

confidence: 99%

“…Lubrication is not an exception; extensive efforts to utilize the principles of biological lubrication for man-made, engineering tribosystems have been put forth in the past a couple of decades [1][2][3]. One of the instrumental approaches in this endeavor is to use water as base lubricant [1][2][3][4][5], mimicking, for example, life-long maintenance of synovial joints of human and animals [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature on the Frictional Properties of Water-Lubricated Surfaces

Lee

Røn

2014

Lubricants

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Abstract:The influence of temperature on the lubricating properties of neat water for tribopairs with varying bulk elasticity moduli and surface hydrophilicity, namely hard-hydrophobic interface (h-HB), hard-hydrophilic interface (h-HL), soft-hydrophobic interface (s-HB), and soft-hydrophilic interface (s-HL), has been investigated. With increasing temperature, the coefficients of friction generally increased due to the decreasing viscosity of water. This change was more clearly manifested from soft interfaces for more feasible formation of lubricating films. Nevertheless, dominant lubrication mechanism appears to be boundary and mixed lubrication even for soft interfaces at all speeds (up to 1200 mm/s) and temperatures (1 to 90 °C) investigated. The results from this study are expected to provide a reference to explore the temperature-dependent tribological behavior of more complex aqueous lubricants, e.g., those involving various additives, for a variety of tribosystems.

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“…Penttilä, Nakari-Setälä, Rouvinen, Ritva, Sarlin, Serimaa, Szilvay, Askolin, Hakanpaa, Paananen, Kisko, etc.) also execute many projects about hydrophobins from the field [97] to the real products [98][99][100][101]. They have carried out many projects about genetic modification.…”

Section: Vtt Technical Research Centre Of Finlandmentioning

confidence: 99%

Recent Advances in Fungal Hydrophobin Towards Using in Industry

2015

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Fungal hydrophobin is a family of low molecular weight proteins consisting of four disulfide bridges and an extraordinary hydrophobic patch. The hydrophobic patch of hydrophobins and the molecules of gaseous CO2 may interact together and form the stable CO2-nanobubbles covered by an elastic membrane in carbonated beverages. The nanobubbles provide the required energy to provoke primary gushing. Due to the hydrophobicity of hydrophobin, this protein is used as a biosurfactant, foaming agent or encapsulating agent in food products and medicine formulations. Increasing demands for using of hydrophobins led to a challenge regarding production and purification of this product. However, the main issue to use hydrophobin in the industry is the regulatory affairs: yet there is no approved legislation for using hydrophobin in food and beverages. To comply with the legislation, establishing a consistent method for obtaining pure hydrophobins is necessary. Currently, few research teams in Europe are focusing on different aspects of hydrophobins. In this paper, an up-to-date collection of highlights from those special groups about the bio-chemical and physicochemical characteristics of hydrophobins have been studied. The recent advances of those groups concerning the production and purification, positive applications and negative function of hydrophobin are also summarised.

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Biomimetic approach to water lubrication with biomolecular additives

Cited by 16 publications

References 25 publications

Effect of operational conditions and environment on lubricity of hydrophobins in water based lubrication systems

Effect of operational conditions and environment on lubricity of hydrophobins in water based lubrication systems

Influence of Temperature on the Frictional Properties of Water-Lubricated Surfaces

Recent Advances in Fungal Hydrophobin Towards Using in Industry

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