Determination of adhesive strength of particles within the liquid/gas interface in flotation by means of a centrifuge method

Schulze, Hans; Wahl, Björn; Gottschalk, G.

doi:10.1016/0021-9797(89)90384-6

Cited by 32 publications

(18 citation statements)

References 4 publications

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“…2. Once a bacterium is detached from a substratum surface, the balance between the surface tension forces acting on the bacterium as opposed to external forces in the flow (i.e., gravitational force, buoyancy force, hydrostatic pressure, and viscous drag force opposing the separation of the bacteria from the collector surfaces) determines the bacterium-bubble aggregate stability (38). For the dimensions considered in the parallelplate flow chamber (i.e., d/R B Ӷ 1 and R B Ӷ 10 m), the surface tension force dominates (28).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

Gómez‐Suárez

Busscher

Mei

2001

Appl Environ Microbiol

189

150

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A theoretical analysis of the detachment of bacteria adhering to substratum surfaces upon the passage of an air-liquid interface is given, together with experimental results for bacterial detachment in the absence and presence of a conditioning film on different substratum surfaces. Bacteria (Streptococcus sobrinus HG1025, Streptococcus oralis J22, Actinomyces naeslundii T14V-J1, Bacteroides fragilis 793E, and Pseudomonas aeruginosa 974K) were first allowed to adhere to hydrophilic glass and hydrophobic dimethyldichlorosilane (DDS)-coated glass in a parallel-plate flow chamber until a density of 4 ؋ 10 6 cells cm ؊2 was reached. For S. sobrinus HG1025, S. oralis J22, and A. naeslundii T14V-J1, the conditioning film consisted of adsorbed salivary components, while for B. fragilis 793E and P. aeruginosa 974K, the film consisted of adsorbed human plasma components. Subsequently, air bubbles were passed through the flow chamber and the bacterial detachment percentages were measured. For some experimental conditions, like with P. aeruginosa 974K adhering to DDS-coated glass and an air bubble moving at high velocity (i.e., 13.6 mm s ؊1 ), no bacteria detached upon passage of an air-liquid interface, while for others, detachment percentages between 80 and 90% were observed. The detachment percentage increased when the velocity of the passing air bubble decreased, regardless of the bacterial strain and substratum surface hydrophobicity involved. However, the variation in percentages of detachment by a passing air bubble depended greatly upon the strain and substratum surface involved. At low air bubble velocities the hydrophobicity of the substratum had no influence on the detachment, but at high air bubble velocities all bacterial strains were more efficiently detached from hydrophilic glass substrata. Furthermore, the presence of a conditioning film could either inhibit or stimulate detachment. The shape of the bacterial cell played a major role in detachment at high air bubble velocities, and spherical strains (i.e., streptococci) detached more efficiently than rod-shaped organisms. The present results demonstrate that methodologies to study bacterial adhesion which include contact with a moving air-liquid interface (i.e., rinsing and dipping) yield detachment of an unpredictable number of adhering microorganisms. Hence, results of studies based on such methodologies should be referred as "bacterial retention" rather than "bacterial adhesion".

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…Bacterial adhesion forms the basis for several diverse problems in medicine (5,10,21,38), industry (3,15,29,32), and environmental areas (8,33). The most detrimental effects are encountered in medicine, where failure of implanted devices may result from surface-associated bacterial infections.…”

mentioning

confidence: 99%

Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

Gómez‐Suárez

Busscher

Mei

2001

Appl Environ Microbiol

189

150

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“…Nutt (1960) presented approximate solutions to the Young-Laplace equation for solid spheres, and described an ingenious experiment to validate the theory. This work was extended by Schulze (1977Schulze ( , 1984, Schulze et al (1989) and Nguyen and Schulze (2004), also with spheres. In flotation however, the particles are rarely of spherical shape, having resulted from size reduction operations which produce particles of irregular shape, with sharp edges and corners.…”

Section: Introductionmentioning

confidence: 97%

The capillary force between a bubble and a cubical particle

Gautam

Jameson

2012

Minerals Engineering

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“…Under such conditions the effective particle [5 ] deposition rate becomes a damped oscillating function and the number of adhering particles varies linearly with time for flor >> 1 and reaches a limiting value in an oscillatory [6 ] fashion.…”

Section: Jo N(t) ---6 +30mentioning

confidence: 99%

Simultaneous monitoring of the adsorption and desorption of colloidal particles during deposition in a parallel plate flow chamber

Meinders

Noordmans

Busscher

1992

Journal of Colloid and Interface Science

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A technique is described to study simultaneously the adsorption and desorption of colloidal particles on collector surfaces in a parallel plate flow chamber. Using a phase contrast microscope equipped with an ultra long working distance objective, the deposition process can be observed in situ. Analysis of successively stored images yields the time of arrival and departure of each colloidal particle, thus enabling determination of the adsorption and desorption rates, as well as of the total number of particles deposited. In addition the method allows analysis of the spatial arrangement of deposited particles, while distinguishing between upstream and downstream deposition of particles, yielding pair distribution functions, going from -180 ° to + 180 °. In this paper the technique has been applied to study the deposition of 736-nm diameter monodisperse polystyrene latex particles from a potassium nitrate solution ( 1 and 60 raM) to glass, using varying flow rates (0.034 to 0.456 cm 3. s-l). Initial deposition rates J0 were derived from the total number of adhering particles n (t) as well as from the experimentally measured time dependence of the deposition rate j(t). The results showed clear tendencies with ionic strength and flow rate. The desorption ratesjdes(t) were small and the desorption rate coefficients/3 were dependent on the residence times of the adhering particles. The blocked areas, derived from the deposition kinetics, ranged from 8 to 675 times the geometrical cross section of a particle, depending on the experimental conditions.

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Determination of adhesive strength of particles within the liquid/gas interface in flotation by means of a centrifuge method

Cited by 32 publications

References 4 publications

Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

The capillary force between a bubble and a cubical particle

Simultaneous monitoring of the adsorption and desorption of colloidal particles during deposition in a parallel plate flow chamber

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