Techniques for measuring surface forces

Claesson, Per M.; Ederth, Thomas; Bergeron, Vance; Rutland, Mark W.

doi:10.1016/0001-8686(96)00302-8

Cited by 242 publications

(163 citation statements)

References 148 publications

Supporting

Mentioning

162

Contrasting

Order By: Relevance

“…It should be noted that Equation (4) works best when the closest distance (i.e., h − r) is greater than several Debye lengths due to the linear approximation treatment [26]. For hydrophobic force, up to now, despite significant research over the last 30 years, a deep and quantitative description of the hydrophobic force remains abstruse [7,23,24]. The specific preparation methods of the hydrophobic surfaces and the measurement techniques seem to have an important influence on the results.…”

Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

View full text Add to dashboard Cite

A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the depressant-coated hydrophobic particle are simplified to a sphere uniformly covered with respectively hydrophobic and hydrophilic nanometer-sized hemispherical asperities of identical radius. Results show that the role of a collector in bubble-particle attachment is to create an attractive hydrophobic force and thus overcome the repulsive van der Waals and electrostatic forces. Moreover, increasing the length of the hydrophobic part of the collector molecule is a more effective way to enhance flotation recovery, compared to increasing the collector concentration. For a depressant, however, its function mechanism is to create a strong electrostatic double-layer force, while the suppression of the hydrophobic force plays a secondary role in decreasing the bubble-particle attachment barrier. The depressant molecule length is also a dominant parameter in designing a powerful depressant.

show abstract

Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

View full text Add to dashboard Cite

show abstract

“…During the last decades several techniques and devices have been developed [17]. One important device is the surface forces apparatus (SFA).…”

Section: Introductionmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

View full text Add to dashboard Cite

“…Consequently, it is necessary to determine the details of the structure of NBF. Pioneering attempts have been made to do this using such experimental approaches as thin-film pressure balance, 12 optical measurement, 13 X-ray reflectivity, 14 FTIR, 15 and gas permeability. 16 Unfortunately, there remain considerable questions about the structure and properties of NBF.…”

Section: Introductionmentioning

confidence: 99%

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

2006

View full text Add to dashboard Cite

We used molecular dynamics (MD) simulations to investigate the structures and properties of Newton black films (NBF) for several surfactants: sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (C16TAB), and surfactin using film thicknesses up to 10 nm. By calculating the interface formation energy for various packing conditions on the surface pressure-area isotherm, we found that the most probable surface concentration is ∼42 Å 2 /molecule for SDS and C16TAB and ∼170 Å 2 /molecule for surfactin. We then used this most probable concentration of each surfactant to simulate NBF with various film thicknesses. From analyzing the disjoining pressure-film thickness isotherms with the density profiles and the solvation coordination number, we found that the increase of the disjoining pressure during the film thinning was coupled with the change in inner structure of the NBF (i.e., density profile and the solvation of ionic entities). In the range of film thicknesses less than ∼30 Å, the disjoining pressures for the SDS and C16TAB were found to be larger than that of the surfactin. We predicted the Gibbs elasticity (175 dyn/cm for surfactin; 109 dyn/cm for C16TAB; 38 dyn/cm for SDS) required to assess the stability of NBF against surface concentration fluctuations, and the shear modulus (6.5 GPa for the surfactin; 6.1 GPa for the C16TAB; 3.5 GPa for the SDS) and the yield stress (∼0.8 GPa for surfactin; ∼0.8 GPa for C16TAB; ∼0.4 GPa for the SDS) to assess the mechanical stability against the externally imposed mechanical perturbation.

show abstract

Techniques for measuring surface forces

Cited by 242 publications

References 148 publications

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Force measurements with the atomic force microscope: Technique, interpretation and applications

Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations

Contact Info

Product

Resources

About