The Role of Surface Roughness and Contact Deformation on the Hydrodynamic Detachment of Particles from Surfaces

Das, Sanjit; Schechter, R.S.; Sharma, Mukul M.

doi:10.1006/jcis.1994.1144

Cited by 87 publications

(52 citation statements)

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“…This demonstrates that the mechanism of particle detachment is rolling not lifting. This is in agreement with the conclusions of Das et al (6).…”

Section: Interaction Between Hydrophilic Surfacessupporting

confidence: 94%

“…Das et al (6) measured pull-off forces between particles (glass and polystyrene) and substrates (glass and mica) in various aqueous solutions and ethanol. He found that in aqueous media the measured pull-off force required to detach a glass particle from a glass substrate increased with decreasing pH and increasing electrolyte concentration.…”

Section: Introductionmentioning

confidence: 99%

“…[3] and [6] and letting i = s and j = l, for a polar system, the Young-Good-Girifalco-Fowkes equation can be written as…”

Section: Introductionmentioning

confidence: 99%

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Detachment of Particles from Surfaces: An AFM Study

Freitas

Sharma

2001

Journal of Colloid and Interface Science

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115

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“…This demonstrates that the mechanism of particle detachment is rolling not lifting. This is in agreement with the conclusions of Das et al (6).…”

Section: Interaction Between Hydrophilic Surfacessupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detachment of Particles from Surfaces: An AFM Study

Freitas

Sharma

2001

Journal of Colloid and Interface Science

Self Cite

115

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“…When the fluid flow is increased to high enough values, the bacterium most likely detaches in a rolling fashion (Das et al, 1994). It can be argued that in this mode of detachment, forces normal to the surface (i.e.…”

Section: Discussionmentioning

confidence: 99%

Forces involved in bacterial adhesion to hydrophilic and hydrophobic surfaces

et al. 2008

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Using a parallel-plate flow chamber, the hydrodynamic shear forces to prevent bacterial adhesion (F prev ) and to detach adhering bacteria (F det ) were evaluated for hydrophilic glass, hydrophobic, dimethyldichlorosilane (DDS)-coated glass and six different bacterial strains, in order to test the following three hypotheses. 1. A strong hydrodynamic shear force to prevent adhesion relates to a strong hydrodynamic shear force to detach an adhering organism. 2. A weak hydrodynamic shear force to detach adhering bacteria implies that more bacteria will be stimulated to detach by passing an air-liquid interface (an air bubble) through the flow chamber. 3. DLVO (Derjaguin, Landau, Verwey, Overbeek) interactions determine the characteristic hydrodynamic shear forces to prevent adhesion and to detach adhering micro-organisms as well as the detachment induced by a passing air-liquid interface. F prev varied from 0.03 to 0.70 pN, while F det varied from 0.31 to over 19.64 pN, suggesting that after initial contact, strengthening of the bond occurs. Generally, it was more difficult to detach bacteria from DDS-coated glass than from hydrophilic glass, which was confirmed by air bubble detachment studies. Calculated attractive forces based on the DLVO theory (F DLVO ) towards the secondary interaction minimum were higher on glass than on DDS-coated glass. In general, all three hypotheses had to be rejected, showing that it is important to distinguish between forces acting parallel (hydrodynamic shear) and perpendicular (DLVO, air-liquid interface passages) to the substratum surface.

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“…Hydrodynamic interaction controlled by flow velocity is another mechanism governing colloid mobilization in porous media. Rapid flow through fractures (Degueldre et al, 1989), rapid infiltration of rainfall (Kaplan et al, 1993), and increases in pumping rate during sampling (Puls et al, 1992;Backhus et al, 1993;Kearl et al, 1994) can produce higher colloid concentrations in groundwater as expected from theoretical and laboratory investigations of model systems (Hubbe, 1985;Sharma et al, 1992;Das et al, 1994). Furthermore, colloid-release processes are complicated by non-uniform distribution of the concentration of naturally deposited colloids in soil profiles, as well as spatiotemporal variations of soil moisture content and pore water velocity.…”

Section: Introductionmentioning

confidence: 93%