Removal of surface adhered particles by surfactants and fluid motions

Batra, Aman; Paria, Santanu; Manohar, C.; Khilar, Kartic C.

doi:10.1002/aic.690471118

Cited by 31 publications

(13 citation statements)

References 18 publications

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“…DLVO and lift forces) are related to forces directed parallel to the surface. However, in similar detachment studies it was found that lift forces are negligible and surface roughness may play a decisive role in determining the hydrodynamic force to remove adhering particles from the surface (Batra et al, 2001;Yiantsios & Karabelas, 1995). This feature is not accounted for in the DLVO theory.…”

Section: Discussionmentioning

confidence: 98%

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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Section: Discussionmentioning

confidence: 98%

Forces involved in bacterial adhesion to hydrophilic and hydrophobic surfaces

et al. 2008

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“…For two spheres of radius and pressed together under a load the radius of the circle of contact is given by: (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) where and are the elastic constants of the material of the spheres:…”

Section: Fig24 Two Spherical Particles In Contactmentioning

confidence: 99%

“…Adhesion forces between particles and surfaces, i.e. the force necessary to detach a particle from a surface is of interest in several industrial applications such as detergency [2], particle filtration [3] and petroleum production [4,5]. For biological systems such as cells or viruses, adhesion to surfaces is important for processes like biofilm formation or infection.…”

Section: Introductionmentioning

confidence: 99%

On the Adhesion between Fine Particles and Nanocontacts: An Atomic Force Microscope Study

et al. 2006

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To optimize the handling of fine powders in industrial applications, understanding the interaction forces between single powder particles is fundamental. The forces between colloidal particles dominate the behavior of a great variety of materials, including paints, paper, soil, and many industrial processes. With the invention of the atomic force microscope (AFM), the direct measurement of the interaction between single micron-sized particles became possible. The adhesional contact between a particle and a substrate is a parameter for analyzing pull-off force data generated by AFM. The aim of this study was to understand surface interactions between fine particles. I measured the adhesion forces between AFM tips or particles attached to AFM cantilevers and different solid samples. Smooth and homogeneous surfaces such as silicon wafer, mica, or highly oriented pyrolytic graphite (HOPG), and more rough and heterogeneous surfaces such as iron particles or patterns of TiO 2 nanoparticles on silicon wafer were used. First, I addressed to the wellknown issue that AFM adhesion experiment results show wide distributions of adhesion forces rather than a single value. My experimental results show that variations in adhesion forces comprise fast (i.e., from one force curves to the next) random fluctuations and slower fluctuations, which occur over tens or hundreds of consecutive measurements. Slow fluctuations are not likely to be the result of variations in external factors such as lateral position, temperature, humidity, and so forth because those were kept constant. Even if two solid bodies are brought into contact under precisely the same conditions (same place, load, direction, etc.) the result of such a measurement will often not be the same as for the previous contact. The measurement itself will induce structural changes in the contact region which can change the value for the next adhesion force measurement.In the second part I studied the influence of humidity on the adhesion of nanocontacts. Humidity was adjusted relatively fast to minimize tip wear during one experiment. For hydrophobic surfaces, no signification change of adhesion force with humidity was observed. Adhesion force-versus-humidity curves recorded with hydrophilic surfaces either showed a maximum or continuously increased. I demonstrate that the results can be interpreted with simple continuum theory of the meniscus force. The meniscus force is calculated based on a model that includes surface roughness and takes into account different AFM tip (or particle) shapes by a two-sphere-model.Experimental and theoretical results show that the precise contact geometry has a critical influence on the humidity dependence of the adhesion force.Changes of tip geometry on the sub-10-nm length scale can completely change adhesion force-versus-humidity curves. Our model can also explain the differences between earlier AFM studies, where different dependencies of the adhesion force on humidity were observed.Keywords: Atomic force microscopy (AFM), cantile...

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“…They reported that the abundance of mobilized particles and the size of the mobilized particles both increased with increasing flow rate during the rainfall simulation, as expected from hydrodynamic detachment theory. Batra et al (2001) found that the hydrodynamic force for detachment theoretically increased as the surface asperity size approached the separation distance.…”

Section: Figures 4 Andmentioning

confidence: 99%