The hydrophilic—hydrophobic transition on silica

Laskowski, J.; Kitchener, J. A.

doi:10.1016/0021-9797(69)90219-7

Cited by 280 publications

(118 citation statements)

References 10 publications

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“…It is rather generally accepted that there is no the TPC formation at hydrophilic solid surfaces and for rapid bubble rupture and the TPC formation, the solid surface has to be hydrophobic [3,4]. It was recently shown, however, that even at the solid/liquid interfaces of high hydrophobicity (contact angle above 100°) immersed in distilled water the duration of the TPC formation, i.e., the total time needed for bubble attachment to solid surface, can vary by over order of magnitude [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces

Zawała¹,

Zawała²,

Małysa³

2015

Annales UMCS, Chemia

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The kinetics of collision and bouncing of an air bubble on hydrophilic and hydrophobic solid surfaces immersed in distilled water is reported. We carried out the experiments and compared the bubble collision and bouncing courses on the stagnant and vibrating, with a controlled frequency and amplitude, solid/liquid interface. For stagnant interface differences in the outcome of the bubble collisions with hydrophilic and hydrophobic solid surfaces are resulting from different stability of the intervening liquid film formed between the colliding bubble and these surfaces. The liquid film was unstable at Teflon surface, where the three-phase contact (TPC) and the bubble attachment were observed, after dissipation of most of the kinetic energy associated with the bubble motion. For vibrated solid surface it was shown that kinetics of the bubble bouncing is independent on the hydrophilic/hydrophobic properties of the surface. Similarly like at water/glass hydrophilic interface, even at highly hydrophobic Teflon surface time of the bubble collisions and bouncing was prolonged almost indefinitely. This was due to the fact that the energy dissipated during the collision was re-supplied via interface vibrations with a properly adjusted acceleration. The analysis of the bubble deformation degree showed that this effect is related to a constant bubble deformation, which determined constant radius of the liquid film, large enough to prevent the draining liquid film from reaching the critical thickness of rupture at the moment of collision. The results obtained prove that mechanism of the bubble bouncing from various interfaces depends on interrelation between rates of two simultaneously going processes: (i) exchange between kinetic and surface energies of the system and (ii) drainage of the liquid film separating the interacting interfaces.

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Section: Introductionmentioning

confidence: 99%

On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces

Zawała¹,

Zawała²,

Małysa³

2015

Annales UMCS, Chemia

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“…is thought to be at pH 2-3. 30 All glassware (except the film holder) was cleaned with piranha solution (1 H 2 O 2 :1 H 2 SO 4 ) for 20 min and rinsed thoroughly with water before use.…”

Section: Materials and Cleaning Proceduresmentioning

confidence: 99%

“…With respect to technical applications a proper understanding of specific ion effects on wetting phenomena is vital for the control of e.g. atmospheric aerosols, 1 heterogeneous catalysis, 27-29 froth flotation [30][31][32] and interactions between macromolecules and ions.…”

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confidence: 99%

Correlation between specific ion adsorption at the air/water interface and long–range interactions in colloidal systems

Schelero

Klitzing

2011

Soft Matter

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Specific ion effects are of high impact in colloid science and dominate processes in aqueous systems from protein folding or precipitation to ordering of particles or macromolecules in bulk solutions. Due to the large internal interface of colloidal systems especially interfacial ion effects are of importance. This paper presents a new insight into the specific ion effects at the air/water interface of monovalent electrolyte solutions and their consequences for long-range interactions in colloidal systems. Solely, in an asymmetric film (i.e. wetting film) one can determine the sign and precise value of the surface potential of the free air/water surface. It is shown that the all over charges of the interfacial region, which are affected by the type of ion, dominate the interfacial forces even over several tens of nm. This is of interest for tailoring the stability of colloidal systems. It is clearly shown that the air/water interface is negatively charged and that both anions and cations affect the surface potential even at very low electrolyte concentrations (10 À4 M).

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“…In initial experiments, the surface tension of the solvent caused the liquid to bead up on the inner glass walls of the funnel (Figure 1c, left image), stopping the flow and promoting mixing (peak broadening). To counteract this, the funnel is heat-treated in the flame of a Bunsen burner to 400°C (as evidenced by a yellow sodium flame) to induce hydrophilicity [23]. After treatment, the flowing liquid forms a film on the inner glass surfaces, which allows the solvent to flow evenly down the funnel (Figure 1c, right image).…”

Section: Solvent Capturing Interfacementioning

confidence: 99%

Mass Spectrometric Imaging Using Laser Ablation and Solvent Capture by Aspiration (LASCA)

Brauer

Beech

Sunner

2015

J. Am. Soc. Mass Spectrom.

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Abstract. A novel interface for ambient, laser ablation-based mass spectrometric imaging (MSI) referred to as laser ablation and solvent capture by aspiration (LASCA) is presented and its performance demonstrated using selected, unaltered biological materials. LASCA employs a pulsed 2.94 μm laser beam for specimen ablation. Ablated materials in the laser plumes are collected on a hanging solvent droplet with electric field-enhanced trapping, followed by aspiration of droplets and remaining plume material in the form of a coarse aerosol into a collection capillary. The gas and liquid phases are subsequently separated in a 10 μL-volume separatory funnel, and the solution is analyzed with electrospray ionization in a high mass resolution Q-ToF mass spectrometer. The LASCA system separates the sampling and ionization steps in MSI and combines high efficiencies of laser plume sampling and of electrospray ionization (ESI) with high mass resolution MS. Up to 2000 different compounds are detected from a single ablation spot (pixel). Using the LASCA platform, rapid (6 s per pixel), high sensitivity, high mass-resolution ambient imaging of Bas-receivedb iological material is achieved routinely and reproducibly.

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The hydrophilic—hydrophobic transition on silica

Cited by 280 publications

References 10 publications

On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces

On mechanism of the bubble bouncing from hydrophilic and hydrophobic solid surfaces

Correlation between specific ion adsorption at the air/water interface and long–range interactions in colloidal systems

Mass Spectrometric Imaging Using Laser Ablation and Solvent Capture by Aspiration (LASCA)

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