Viscosity anomalies in liquid surface zones

Peschel, G.; Adlfinger, K. H.

doi:10.1016/0021-9797(70)90212-2

Cited by 66 publications

(17 citation statements)

References 25 publications

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“…Because hydrogen bond formation has a low activation energy, it occurs at room temperature, and the interaction of inorganic particles and substrate surfaces via hydrogen bonding is possible [23]. Water viscosity experiments have demonstrated the existence of hydrogen bonds between spherical and flat silica surfaces [25]. Although the hydrogen bond is not a particularly strong bond ( w 5 kcal/mole [26]), it is, nonetheless, stronger than a van der Waals bond (-1 kcal/mole [27]).…”

Section: Discussionmentioning

confidence: 99%

Excimer Laser Induced Removal of Particles from Hydrophilic Silicon Surfaces

Sacher

Meunier

1999

The Journal of Adhesion

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A pulsed KrF excimer laser was used to remove several types of submicron-sized particles from silicon surfaces. Polystyrene latex particles, 0.1 pm and larger, were removed from silicon surfaces by dry laser cleaning (no water layer condensed on the surface) but Si02 particles could not be so removed. However, during steam laser cleaning, in which a thin film of water is deposited on the surface as both an energy transfer medium and an adhesion force reduction agent, these 0.1 -0.2 pm SiOz particles were almost entirely removed. Calculations of the various forces contributing to adhesion indicate that hydrogen bonds are the major contributor to the adhesion of inorganic particles to substrate surfaces. Photoacoustic detection, using piezoelectric transducers, monitored the surface vibrations induced by the laser pulses.

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Section: Discussionmentioning

confidence: 99%

Excimer Laser Induced Removal of Particles from Hydrophilic Silicon Surfaces

Sacher

Meunier

1999

The Journal of Adhesion

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“…10 Water viscosity experiments have demonstrated the existence of hydrogen bonds between spherical and flat fused silica surfaces. 11 Although the hydrogen bond is not a strong chemical bond ͑its bond energy is generally about 5 kcal/mole or 0.22 eV/bond͒, 3 it is, nonetheless, much stronger than the energy of van der Waals adhesion, typically a 1 kcal/mole or 0.043 eV/bond. 12 Thus, hydrogen bonding may play a very important role in the adhesion of particles to substrate surfaces.…”

Section: Introductionmentioning

confidence: 99%

The effects of hydrogen bonds on the adhesion of inorganic oxide particles on hydrophilic silicon surfaces

Wu¹,

Sacher²,

Meunier³

1999

Journal of Applied Physics

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“…The term "effective viscosity" of water, which is significant to lubrication behavior, has a disputed history. Peschel et al [62] first reported an anomalously high viscosity in 1970. Zhu and Granick [63] also reported an effective viscosity varying by orders of magnitude for water confined between mica crystals with a thickness of 1-2 water molecules.…”

Section: Lubrication Behaviors Of Aqueous Liquids In Confinementmentioning

confidence: 99%

Progress in experimental study of aqueous lubrication

Zhang

Liu

2012

Chin. Sci. Bull.

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Aqueous lubrication is commonly regarded as friendly to the environment. We review current knowledge of the behaviors and mechanisms of aqueous lubrication. Major methods for investigating aqueous lubrication are addressed. We describe studies on both friction and film formation performance of various water-based lubricants. Additionally, we discuss possible underlying mechanisms of aqueous lubrication. Attention is also drawn to continuing topics of investigation and some unsolved problems. [20][21][22], and aqueous lubrication [23][24][25]. Aqueous solutions are drawing attention because of their ecological advantages, fire-resistance, high thermal conductivity, nontoxicity, accessibility, biodegradability, environmental friendliness, and good solvency. However, water-based solutions have several disadvantages as lubricants, such as corrosiveness, vaporization and non-viscosity [26,27]. In the past several decades, aqueous fluids have been extensively used as lubricants in metal working processes, food processing, biological systems etc. Since petroleum will be exhausted within 50 years, aqueous fluids will have wide application in many industrial fields. Thus, research on aqueous fluids has become an important branch of tribology. Use of water-based lubrication in engineering can be traced back to about 2400 BC, when people used water as a lubricant in transporting statues in Egypt [28]. Meanwhile, water-based liquids have always been excellent lubricants in mammalian joints such as knees or hips, with friction coefficients μ< 0.002 [29,30]. Till now this ultra-low friction has not been well emulated in human-made aqueous systems. In contrast to oils and organic solvents, water has many unique properties due to the polarity of its molecules, which makes aqueous lubrication much more complicated than traditional lubrication with oils.Many studies have revealed both the characteristics and mechanisms of aqueous lubricants, with a wide variety of dimensions, conditions and application areas. In spite of the great efforts of both experimentalists and theorists, the study of aqueous lubrication still faces big challenges. As mentioned above, human-made systems seldom emulate natural lubrication well enough for practical use. Major efforts have been made to reduce the friction force of aqueous solutions between two solid surfaces and enhance the film formation ability at the same time. Nanotechnology has made much progress in revealing the underlying mechanisms and behaviors of materials at the nanometer-scale, especially the behaviors of atoms and molecules [31][32][33]. However, the mechanisms of aqueous lubrication are still not well known because of the diversity and complexity of aqueous solutions. This paper presents a general review of research on aqueous lubrication.

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Viscosity anomalies in liquid surface zones

Cited by 66 publications

References 25 publications

Excimer Laser Induced Removal of Particles from Hydrophilic Silicon Surfaces

Excimer Laser Induced Removal of Particles from Hydrophilic Silicon Surfaces

The effects of hydrogen bonds on the adhesion of inorganic oxide particles on hydrophilic silicon surfaces

Progress in experimental study of aqueous lubrication

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