Structure of Water Near Solid Interfaces

Drost-Hansen, W.

doi:10.1021/ie50719a005

Cited by 314 publications

(89 citation statements)

References 36 publications

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“…The viscosity and density of water in the vicinity of the particle and in contact with the ice germ are assumed similar to those in the bulk (Kashchiev, 2000). This is at odds with evidence of a strong effect of 30 immersed particles on the vicinal water (Drost-Hansen, 1969;Michot et al, 2002). In fact, such an effect may be responsible for the enhancement of ice nucleation near immersed solids (Anderson, 1967).…”

Section: Introductionmentioning

confidence: 95%

“…It has been known for some time that water near interfaces displays physicochemical properties different from those of the bulk (e.g., Drost-Hansen, 1969;Michot et al, 2002;Bellissent-Funel, 2002). By examining a wealth 5 of available observations Drost-Hansen (1969) concluded that vicinal water may exist in a ordered state near the solid-liquid interface and that such ordered structures may propagate over considerable distance, of the order of hundreds to thousands of molecular diameters. More recent experiments showing that hydrophilic surfaces have a long-range impact further support this conclusion (e.g., Zheng et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Early studies concluded that ordered water near immersed surfaces does not resemble a caltrate-like orientation of water molecules (Drost-Hansen, 1969). Rather, in the supercooled region the presence of structured low-density regions near solid surfaces (termed "ice-like") has been reported for different materials (e.g., Etzler, 1983;Yu et al, 2001;Michaelides and Morgenstern, 2007;Feibelman, 2010;Snyder et al, 20 2014).…”

Section: Introductionmentioning

confidence: 99%

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On the Thermodynamic and Dynamic Aspects of Immersion Ice Nucleation

Barahona¹

2017

Preprint

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Abstract.Heterogeneous ice nucleation initiated by particles immersed within droplets is likely the main pathway of ice formation in the atmosphere. Theoretical models commonly used to describe this process assume that it mimics ice formation from the vapor, neglecting interactions unique to the liquid phase. This work introduces a new approach that accounts for such interactions by linking the ability of particles to promote ice formation to the modification of the properties of water near the particle-liquid 5 interface. It is shown that the same mechanism that lowers the thermodynamic barrier for ice nucleation also tends to decrease the mobility of water molecules, hence the ice-liquid interfacial flux. Heterogeneous ice nucleation in the liquid phase is thus determined by the competition between thermodynamic and kinetic constraints to the formation and propagation of ice. At the limit, ice nucleation may be mediated by the dynamics of vicinal water instead of the nucleation work. This new ice nucleation regime is termed spinodal ice nucleation. Comparison of predicted nucleation rates against published data suggests that some 10 materials of atmospheric relevance may nucleate ice in this regime.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Thermodynamic and Dynamic Aspects of Immersion Ice Nucleation

Barahona¹

2017

Preprint

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“…It is widely agreed that water adjacent to solid surfaces shows modified properties induced by an orienting effect extending from the first adsorbed and immobilized molecular layer [1][2][3][4][5][6][7]. Unfortunately, there is still a large disagreement in literature about the thickness of the boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Repulsion Phenomena in Thin Layers of Alcoholic Solutions of Tetrabutylammonium Iodide

Peschel¹,

Belouschek²

1980

Zeitschrift Für Naturforschung A

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The structural disjoining pressure of methyl-, ethyl-, n-propyl, and n-butyl alcohol was determined in thin layers between highly smooth rutile surfaces when tetrabutylammonium iodide was added. The a verage thickness of the oriented solvation layers per interface turned out to be largest for methyl alcohol (about 1.5 nm) and decreases like the disjoining pressure when passing to the related alcohols with longer chain lengths. Tetrabutylammonium iodide clearly reduces the thickness of the boundary layer with increasing concentration.

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“…This is due to the fact that most minerals are not naturally hydrophobic and bulk water molecules will form an ordered assembly on these surfaces through dipoledipole interactions (Staszczuk & Bilinski, 1987). In doing so the particle or mineral surface properties resemble those of the bulk water molecules and will therefore bond with the bulk water phase (Drost-Hansen, 1969). The consequence is that this solid-liquid interface is not easily disrupted, resulting in a high-energy barrier for particle-bubble attachment (Staszczuk & Bilinski, 1993).…”

Section: Flotation Additives (Reagents)mentioning

confidence: 99%

The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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Structure of Water Near Solid Interfaces

Cited by 314 publications

References 36 publications

On the Thermodynamic and Dynamic Aspects of Immersion Ice Nucleation

On the Thermodynamic and Dynamic Aspects of Immersion Ice Nucleation

Repulsion Phenomena in Thin Layers of Alcoholic Solutions of Tetrabutylammonium Iodide

The effect of mineral grain textures at particle surfaces on flotation response

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