The impact of nanoscale chemical features on micron-scale adhesion: Crossover from heterogeneity-dominated to mean-field behavior

Duffadar, Ranojoy; Kalasin, Surachate; Davis, Jeffrey M.; Santore, Maria M.

doi:10.1016/j.jcis.2009.05.046

Cited by 85 publications

(151 citation statements)

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“…In systems where the average surface or zeta potential over the whole surface of a colloidal particle would indicate a sufficiently repulsive force to prevent aggregation or deposition, it has been shown that attraction and deposition still occurs [41][42][43][44]. This is typically attributed to heterogeneities in the surface charge, with surface patches that exist where attractive forces dominate over the surface-average repulsion, leading to particle deposition.…”

Section: Discussionmentioning

confidence: 99%

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Herman

Walz

2013

Langmuir

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An experimental investigation was conducted to evaluate the possible use of highlycharged spherical nanoparticles to stabilize an aqueous dispersion of weakly-charged microspheres. At low pH values, the surface of silica is weakly charged, which leads to flocculation of colloidal suspensions of silica microspheres. Binary solutions of weakly charged silica microspheres and highly charged polystyrene latex nanoparticles result in adsorption of the nanoparticles onto the surface of the silica microspheres. This effectively "recharges" the silica spheres, with effective zeta potentials increased to the range that is unfavorable for flocculation of microspheres in a silica-only solution. However, this does not guarantee stability, and comparisons between positively charged amidine latex nanoparticles and negatively charged sulfate latex nanoparticles indicate that the degree of coverage plays an important role in the restabilization. The sulfate latex nanoparticles do not cover the surface sufficiently, and though they seemingly provide sufficient charge, the weakly charged patches of the exposed silica substrate can lead to flocculation. The amidine latex nanoparticles, on the other hand, cover the surface more completely, and effectively prevent flocculation of the silica microspheres. The mechanisms responsible for this different adsorption and stabilizing behavior are not entirely understood, as both the amidine and sulfate latex nanoparticles are of similar size and the magnitude of the zeta potentials of the different particle types are comparable.iii

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Section: Discussionmentioning

confidence: 99%

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Herman

Walz

2013

Langmuir

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“…For example, colloidal adhesion was found to have heterogeneity-dominated or mean-eld behavior depending on the scale of surface heterogeneity. 11 The inuence of surface heterogeneity on protein adsorption has been studied at the microscale.…”

Section: -5mentioning

confidence: 99%

Protein–nanoparticle interactions: the effects of surface compositional and structural heterogeneity are scale dependent

et al. 2013

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Nanoparticles (NPs) in the biological environment are exposed to a large variety and concentration of proteins. Proteins are known to adsorb in a 'corona' like structure on the surface of NPs. In this study, we focus on the effects of surface compositional and structural heterogeneity on protein adsorption by examining the interaction of self-assembled monolayer coated gold NPs (AuNPs) with two types of proteins: ubiquitin and fibrinogen. This work was designed to systematically investigate the role of surface heterogeneity in nanoparticle-protein interaction. We have chosen the particles as well as the proteins to provide different types (in distribution and length-scale) of heterogeneity. The goal was to unveil the role of heterogeneity and of its length-scale in the particle-protein interaction. Dynamic light scattering and circular dichroism spectroscopy were used to reveal different interactions at pH above and below the isoelectric points of the proteins, which is related to the charge heterogeneity on the protein surface. At pH 7.4, there was only a monolayer of proteins adsorbed onto the NPs and the secondary structure of proteins remained intact. At pH 4.0, large aggregates of nanoparticle-protein complexes were formed and the secondary structures of the proteins were significantly disrupted. In terms of interaction thermodynamics, results from isothermal titration calorimetry showed that ubiquitin adsorbed differently onto (1) AuNPs with charged and nonpolar terminals organized into nano-scale structure (66-34 OT), (2) AuNPs with randomly distributed terminals (66-34 brOT), and (3) AuNPs with homogeneously charged terminals (MUS). This difference in adsorption behavior was not observed when AuNPs interacted with fibrinogen. The results suggested that the interaction between the proteins and AuNPs was influenced by the surface heterogeneity on the AuNPs, and this influence depends on the scale of surface heterogeneity and the size of the proteins.

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“…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%

“…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. 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.…”

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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The impact of nanoscale chemical features on micron-scale adhesion: Crossover from heterogeneity-dominated to mean-field behavior

Cited by 85 publications

References 85 publications

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Stabilization of Weakly Charged Microparticles Using Highly Charged Nanoparticles

Protein–nanoparticle interactions: the effects of surface compositional and structural heterogeneity are scale dependent

Transport and deposition of functionalized CdTe nanoparticles in saturated porous media

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