Drying of oil-in-water emulsions on hydrophobic and hydrophilic substrates

Kapilashrami, Abha; Eskilsson, Krister; Bergström, Lennart; Malmsten, Martin

doi:10.1016/j.colsurfa.2003.11.022

Cited by 20 publications

(18 citation statements)

References 21 publications

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“…The emulsion forms a wedge in front of the slider and elastohydrodynamic calculations [5,15] show that smaller the droplets are, more likely, they are drawn towards the apex of the wedge than the bigger droplets are. The packing density for the smaller droplets in this region being higher [16,17] than that for the bigger droplets the smaller droplet becomes a source for larger volumes of oil being feed into the contact than what may be achieved with the bigger droplets. Once the droplet enters the feed zone the small droplets are deformed to conform to the geometry of the contact.…”

Section: Force Regime Between the Droplets And The Substratementioning

confidence: 92%

Tribology of steel/steel interaction in oil-in-water emulsion; a rationale for lubricity

Kumar

Daniel

Biswas

2010

Journal of Colloid and Interface Science

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Section: Force Regime Between the Droplets And The Substratementioning

confidence: 92%

Tribology of steel/steel interaction in oil-in-water emulsion; a rationale for lubricity

Kumar

Daniel

Biswas

2010

Journal of Colloid and Interface Science

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“…Unfortunately, this effect has not been investigated, with one exception. A most distinct difference was found between evaporating on a hydrophilic vs. a hydrophobic surface in the pioneering investigation by Kapilashrami et al [8] The latter surface caused destabilization of the emulsion, in contrast to the effect of the former. This effect certainly merits more attention.…”

Section: Introductionmentioning

confidence: 95%

Constant vapour pressure evaporation from a fragrance emulsion—effect of solubility of surfactant in the fragrance compound

Ge¹,

Friberg²,

Guo³

2008

Flavour & Fragrance J

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The algebraic system to extract information from phase diagrams was used to establish some of the conditions for an emulsion to evaporate under constant vapour pressure. The model system for the calculations was an emulsion characterized by virtually no solubility in water by either the surfactant or the fragrance and the same condition for the water in the oil. The surfactant and the fragrance, on the other hand, were assumed to be mutually completely soluble and this solution was presupposed to be close to ideal. The results showed a surprisingly strong dependence of the times for evaporation under constant vapour pressure on the surfactant concentration in the oil phase, at which the two-phase equilibrium between the aqueous and the oil phases is replaced by a three-phase equilibrium: aqueous phase, oil phase and liquid crystal phase. The lower this concentration, the more extended the times for evaporation under constant vapour pressure.

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“…Stability of PDMS emulsion in water was studied in [13] and their drying patterns on hydrophobic and hydrophilic substrates was described recently in [14]. The present study focused on description of droplet spreading across many environments like vacuum, water and air on surfaces which vary in hydrophilic propertied.…”

Section: Introductionmentioning

confidence: 99%

PDMS spreading morphological patterns on substrates of different hydrophilicity in air vacuum and water

Zbik

Frost

2010

Journal of Colloid and Interface Science

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In paper has been to investigate the morphological patterns and kinetics of PDMS spreading on silicon wafer using combination of techniques like ellipsometry, atomic force microscope (AFM), scanning electron microscope (SEM) and optical microscopy. A macroscopic silicone oil drops as well as PDMS water based emulsions were studied after deposition on a flat surface of silicon wafer in air, water and vacuum. Our own measurements using an imaging ellipsometer, which also clearly shows the presence of a precursor film. The diffusion constant of this film, measured with a 60,000 cS PDMS sample spreading on a hydrophilic silicon wafer is D(f)=1.4x10(-11) m(2)/s. Regardless of their size, density and method of deposition, droplets on both types of wafer (hydrophilic and hydrophobic) flatten out over a period of many hours, up to 3 days. During this process neighbouring droplets may coalesce, but there is strong evidence that some of the PDMS from the droplets migrates into a thin, continuous film that covers the surface in between droplets. The thin film appears to be ubiquitous if there has been any deposition of PDMS. However, this statement needs further verification. One question is whether the film forms immediately after forced drying, or whether in some or all cases it only forms by spreading from isolated droplets as they slowly flatten out.

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Drying of oil-in-water emulsions on hydrophobic and hydrophilic substrates

Cited by 20 publications

References 21 publications

Tribology of steel/steel interaction in oil-in-water emulsion; a rationale for lubricity

Tribology of steel/steel interaction in oil-in-water emulsion; a rationale for lubricity

Constant vapour pressure evaporation from a fragrance emulsion—effect of solubility of surfactant in the fragrance compound

PDMS spreading morphological patterns on substrates of different hydrophilicity in air vacuum and water

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