Coupled Influence of Colloidal and Hydrodynamic Interactions on the RSA Dynamic Blocking Function for Particle Deposition onto Packed Spherical Collectors

Ko, Chun-Han; Bhattacharjee, Subir; Elimelech, Menachem

doi:10.1006/jcis.2000.7062

Cited by 51 publications

(48 citation statements)

References 37 publications

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“…The importance of geochemical heterogeneity has been investigated in colloid transport (Johnson et al, 1996;Ren et al, 2000), but not yet applied to virus transport modeling. Additionally, the dynamics of colloid attachment have been extensively studied Elimelech, 1993, 1994;Johnson and Elimelech, 1995;Ko et al, 2000), but not yet applied to virus transport modeling. Progressive deposition of colloids on grain surfaces alters the rate of attachment, resulting in either inhibition (blocking) or enhancement (ripening) of further colloid attachment (Kuhnen et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Virus transport in physically and geochemically heterogeneous subsurface porous media

Bhattacharjee

Ryan

Elimelech

2002

Journal of Contaminant Hydrology

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Section: Introductionmentioning

confidence: 99%

Virus transport in physically and geochemically heterogeneous subsurface porous media

Bhattacharjee

Ryan

Elimelech

2002

Journal of Contaminant Hydrology

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“…The RSA model with electric double layer potential successfully describes the maximum surface coverage of diffusional deposition of nanoparticles and dendritic polyelectrolytes on planar surfaces 12), 13) . Also, the maximum surface coverage in the deposition in granular porous media qualitatively follows the RSA model with double layer force in terms of the dependence of surface coverage on salt concentration 7), 8) . However, while the electric double layer force is dependent on the surface charge 3),9),10) , the effect of surface charge on the later stage of deposition has not yet been studied for the deposition in porous media of packed collector beads.…”

Section: Introductionmentioning

confidence: 73%

“…Transport behaviors of colloidal particles in porous media are reflected by the hydrodynamic and colloidal interactions between particles and/or between particles and collector materials making porous media 3),4),5),6),7), 8) . For the better understanding on these interactions, many experimental and theoretical studies have been carried out for simple systems 3),4),5),6),7), 8) . Colloid transport in granular porous media depends on the kinetics of particle deposition onto the surface of collectors composing porous media.…”

Section: Introductionmentioning

confidence: 99%

“…Colloid transport in granular porous media depends on the kinetics of particle deposition onto the surface of collectors composing porous media. The theoretical treatment of deposition consists of the transport process of colloidal particles as well as the physicochemical interactions between particles and between particles and collectors 3),4),5),6),7), 8) . The physicochemical interactions are generally given by the Derjaguin-Landau and Verwey-Overbeek (DLVO) force, which is the superposition of electric double layer and the van der Waals forces and is influenced by the surface charge, ionic strength, and the solution pH, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The lateral repulsion between a depositing particle and a previously deposited particle reduces the chance of further deposition. This phenomenon is called a blocking 7), 8) . The blocking dynamics needs to be quantitatively understood to describe the colloid transport in porous media in addition to the single collector efficiency 7),8) .…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Surface Charging Properties on Colloid Transport in Porous Media

2014

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Transport properties of colloidal particles in a packed bed of collector beads are affected by hydrodynamic and colloidal interactions between particles as well as between the particle and the collector. The colloidal interaction depends on the surface charging of collectors and particles. While many researchers have studied on the colloid deposition and transport in porous media as a function of ionic strength, experimental investigations examining the effect of surface charge are scarce. To figure out the effect of surface charge on the colloid transport in porous media, we have performed colloid transport experiments in a packed bed of spherical beads. In the present experiment, we used sulfate latex with a constant negative charge and carboxylate latex having pH-dependent negative charge as colloidal particles. Zirconia beads with pH-dependent charge and an isoelectric point around pH 7 were adopted as collectors. Colloid transport experiments were carried out in 1 mM KCl as a function of pH and breakthrough curves of colloid were obtained. The experimental breakthrough curves were analyzed by a convection-dispersion equation including colloid deposition, where colloid filtration and dynamic blocking are considered. The results of experiments and analysis show that the maximum surface coverage of sulfate latex on the collector surface is constant against pH change. On the one hand, the maximum coverage of carboxyl latex decreases with increasing pH, indicating that the lateral particle-particle repulsion increased by high charge enhances blocking in later stage of deposition. The result suggests that electro-hydrodynamic interaction also affects the maximum coverage.

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Tuning the Topography of Non‐Wetting Surfaces to Reduce Short‐Term Microbial Contamination Within Hospitals

van den Berg,

Asker,

Kim

et al. 2024

Adv Funct Materials

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Microbial contamination of hospital surfaces is a major contributor to infectious disease transmission. This work demonstrates that superhydrophobic (Cassie‐Baxter) micro post topographies can significantly reduce cell attachment compared to flat controls. For ordered micro post arrays (post diameters 0.3 to 150 µm), the attachment of four pathogens (Pseudomonas aeruginosa, Staphylococcus aureus, Escherichia coli, and Candida albicans) from discrete contaminant droplets upon short‐term contact (15 s to 30 min) are assessed. There is a 3‐4‐log decrease in microbial attachment when reducing the micro posts diameters from 150 to 0.3 µm for all strains, with large posts (>20 µm) exhibiting similar attachment rates to flat controls. The critical, maximum feature size to prevent attachment can be tuned depending on the ratio of the cell size to post diameter. Two potential mechanisms are discussed for this size effect. First, application of the random sequential adsorption model shows that this relative post/cell size effect may be due to a reduced probability of attachment, which is theorized to be the dominant mechanism. Alternatively, a physical model is suggested for bacterial cell “pull‐off” due to surface tension forces during droplet dewetting. This work may be important for the design of non‐wetting antimicrobial surfaces within healthcare environments.

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Coupled Influence of Colloidal and Hydrodynamic Interactions on the RSA Dynamic Blocking Function for Particle Deposition onto Packed Spherical Collectors

Cited by 51 publications

References 37 publications

Virus transport in physically and geochemically heterogeneous subsurface porous media

Virus transport in physically and geochemically heterogeneous subsurface porous media

The Effects of Surface Charging Properties on Colloid Transport in Porous Media

Tuning the Topography of Non‐Wetting Surfaces to Reduce Short‐Term Microbial Contamination Within Hospitals

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