Dynamic adhesion behavior of micrometer-scale particles flowing over patchy surfaces with nanoscale electrostatic heterogeneity

Duffadar, Ranojoy; Davis, Jeffrey M.

doi:10.1016/j.jcis.2008.07.004

Cited by 89 publications

(156 citation statements)

References 41 publications

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“…Duffadar et al (2009) through laboratory experiments and simulations showed that the interaction of flowing negative colloidal particles (0.5-2 μm) with polycation-based positive patches on negative substances caused particle deposition at high IS, however, no deposition occurred at low IS. Results presented by Duffadar and Davis (2008) indicate that the magnitude of the attractive electrostatic force between the colloids and the "favorable nanoscale patches" will increase with IS due to compression of the double layer thickness and will also be a function of the colloid size. Alonso et al (2004) studied the interaction of negatively charged gold particles (47 nm) with granite mineral using the μPIXE technique and demonstrated that NP attachment did not occur when there were no chemical heterogeneities on the solid surface.…”

Section: Surface Charge Heterogeneitymentioning

confidence: 99%

“…The repulsive forces from neighboring unfavorable regions of nanoscale charge heterogeneities have a significant effect on the adhesive forces exerted from nanoscale charge sites on the NPs (Duffadar and Davis, 2008;Duffadar et al, 2009). These researchers demonstrated through experimental and theoretical studies that nanoscale positively charged heterogeneities on negative surfaces produce colloid attachment depending on the solution IS and the size of colloidal particles (Duffadar and Davis, 2008;Duffadar et al, 2009).…”

Section: Surface Charge Heterogeneitymentioning

confidence: 99%

“…These researchers demonstrated through experimental and theoretical studies that nanoscale positively charged heterogeneities on negative surfaces produce colloid attachment depending on the solution IS and the size of colloidal particles (Duffadar and Davis, 2008;Duffadar et al, 2009). Kozlova and Santore (2007) experimentally demonstrated that 0.5 μm silica particles attached to a net-negative and netrepulsive surface on which nanotextured positive patches (11 nm) were randomly distributed.…”

Section: Surface Charge Heterogeneitymentioning

confidence: 99%

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Transport and deposition of functionalized CdTe nanoparticles in saturated porous media

Torkzaban

Kim

Mulvihill

et al. 2010

Journal of Contaminant Hydrology

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Comprehensive understanding of the transport and deposition of engineered nanoparticles (NPs) in subsurface is required to assess their potential negative impact on the environment. We studied the deposition behavior of functionalized quantum dot (QD) NPs (CdTe) in different types of sands (Accusand, ultrapure quartz, and iron-coated sand) at various solution ionic strengths (IS). The observed transport behavior in ultrapure quartz and iron-coated sand was consistent with conventional colloid deposition theories. However, our results from the Accusand column showed that deposition was minimal at the lowest IS (1 mM) and increased significantly as the IS increased. The effluent breakthrough occurred with a delay, followed by a rapid rise to the maximum normalized concentration of unity. Negligible deposition in the column packed with ultrapure quartz sand (100 mM) and Accusand (1 mM) rules out the effect of straining and suggests the importance of surface charge heterogeneity in QD deposition in Accusand at higher IS. Data analyses further show that only a small fraction of sand surface area contributed in QD deposition even at the highest IS (100 mM) tested. The observed delay in breakthrough curves of QDs was attributed to the fast diffusive mass transfer rate of QDs from bulk solution to the sand surface and QD mass transfer on the solid phase. Scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis were used to examine the morphology and elemental composition of sand grains. It was observed that there were regions on the sand covered with layers of clay particles. EDX spectra collected from these regions revealed that Si and Al were the major elements suggesting that the clay particles were kaolinite. Additional batch experiments using gold NPs and SEM analysis were performed and it was observed that the gold NPs were only deposited on clay particles originally on the Accusand surface. After removing the clays from the sand surface, we observed negligible QD deposition even at 100 mM IS. We proposed that nanoscale charge heterogeneities on clay particles on Accusand surface played a key role in QD deposition. It was shown that the value of solution IS determined the extent to which the local heterogeneities participated in particle deposition.

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Section: Surface Charge Heterogeneitymentioning

confidence: 99%

Section: Surface Charge Heterogeneitymentioning

confidence: 99%

Section: Surface Charge Heterogeneitymentioning

confidence: 99%

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Transport and deposition of functionalized CdTe nanoparticles in saturated porous media

Torkzaban

Kim

Mulvihill

et al. 2010

Journal of Contaminant Hydrology

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“…XXXX, XXX, XXX−XXX electrostatic zone of influence, which is proportional to the colloid size. 65 In particular, the influence of nanoscale chemical heterogeneity is less pronounced for larger colloids because these effects are averaged over a larger zone of influence. 66,67 MWCNT BTCs shown in Figure 2a exhibited time-dependent blocking behavior (increasing breakthrough concentrations with injection) as retention locations filled over time.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Do Goethite Surfaces Really Control the Transport and Retention of Multi-Walled Carbon Nanotubes in Chemically Heterogeneous Porous Media?

Zhang

Bradford

Šimůnek

et al. 2016

Environ. Sci. Technol.

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Transport and retention behavior of multi-walled carbon nanotubes (MWCNTs) was studied in mixtures of negatively charged quartz sand (QS) and positively charged goethite-coated sand (GQS) to assess the role of chemical heterogeneity. The linear equilibrium sorption model provided a good description of batch results, and the distribution coefficients (K D ) drastically increased with the GQS fraction that was electrostatically favorable for retention. Similarly, retention of MWCNTs increased with the GQS fraction in packed column experiments. However, calculated values of K D on GQS were around 2 orders of magnitude smaller in batch than packed column experiments due to differences in lever arms associated with hydrodynamic and adhesive torques at microscopic roughness locations. Furthermore, the fraction of the sand surface area that was favorable for retention (S f ) was much smaller than the GQS fraction because nanoscale roughness produced shallow interactions that were susceptible to removal. These observations indicate that only a minor fraction of the GQS was favorable for MWCNT retention. These same observations held for several different sand sizes. Column breakthrough curves were always well described using an advective-dispersive transport model that included retention and blocking. However, depth-dependent retention also needed to be included to accurately describe the retention profile when the GQS fraction was small. Results from this research indicate that roughness primarily controlled the retention of MWCNTs, although goethite surfaces played an important secondary role.

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“…Although details regarding the microscopic structure of tethers, distribution of attachment sites and geometry of the substrates do vary greatly, the essential physics involved is common to various phenomena including the coagulation of subunits in biochemical processes [1], binding using DNA covered nano-particles [2], aging of a stuck colloid [3], tethering and adhesion of cells [4][5][6][7][8] and the capture efficiency of immersed, sticky surfaces [9]. In these scenarios, substrates come into close proximity allowing the longest polymeric tethers to provide the initial attachment between substrates.…”

mentioning

confidence: 99%

How Things Get Stuck: Kinetics, Elastohydrodynamics, and Soft Adhesion

2012

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Dynamic adhesion behavior of micrometer-scale particles flowing over patchy surfaces with nanoscale electrostatic heterogeneity

Cited by 89 publications

References 41 publications

Transport and deposition of functionalized CdTe nanoparticles in saturated porous media

Transport and deposition of functionalized CdTe nanoparticles in saturated porous media

Do Goethite Surfaces Really Control the Transport and Retention of Multi-Walled Carbon Nanotubes in Chemically Heterogeneous Porous Media?

How Things Get Stuck: Kinetics, Elastohydrodynamics, and Soft Adhesion

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