Interactions between nanoparticles and fractal surfaces

Wang, Hong; Zhang, Wei; Zeng, Shuaibo; Shen, Chongyang; Jin, Chao; Huang, Yuanfang

doi:10.1016/j.watres.2018.12.029

Cited by 33 publications

(14 citation statements)

References 51 publications

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“…Furthermore, colloid release with IS reduction from a deep primary minimum from charge heterogeneity on a smooth grain surface is not possible due to an increase in the energy barrier (Shen et al, 2018). Conversely, colloid release with IS reduction may occur from shallow primary minima that happen on tops of nanoscale roughness asperities like pillars (Shen et al, 2018) or fractal surfaces (Shen et al, 2018;Wang et al, 2019), but not from concave locations between roughness asperities because attachment (in primary minima) is irreversible to IS reduction in these valley areas (Li et al, 2017;Wang et al, 2019). The difference in the AgNP release with IS reduction apparently reflects retention on asperities with a shallower primary minimum on the smoother GF sand than the rougher QW sand, e.g., GF sand may contain a smaller roughness fraction or more nanoscale asperities (Wang et al, 2019) than the rougher QW sand.…”

Section: Release Of Retained Agnps From Quartz Sands With Different Rmentioning

confidence: 99%

Evidence for the critical role of nanoscale surface roughness on the retention and release of silver nanoparticles in porous media

Liang

Zhou

Dong

et al. 2020

Environmental Pollution

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Although nanoscale surface roughness has been theoretically demonstrated to be a crucial factor in the interaction of colloids and surfaces, little experimental research has investigated the influence of roughness on colloid or silver nanoparticle (AgNP) retention and release in porous media. This study experimentally examined AgNP retention and release using two sands with very different surface roughness properties over a range of solution pH and/or ionic strength (IS). AgNP transport was greatly enhanced on the relatively smooth sand in comparison to the rougher sand, at higher pH, and lower IS and fitted model parameters showed systematic changes with these physicochemical factors. Complete release of the retained AgNPs was observed from the relatively smooth sand when the solution IS was decreased from 40 mM NaCl to deionized (DI) water and then the solution pH was increased from 6.5 to 10. Conversely, less than 40% of the retained AgNPs was released in similar processes from the rougher sand. These observations were explained by differences in the surface roughness of the two sands which altered the energy barrier height and the depth of the primary minimum with solution chemistry. Limited numbers of AgNPs apparently interacted in reversible, shallow primary minima on the smoother sand, which is consistent with the predicted influence of a small roughness fraction (e.g., pillar) on interaction energies. Conversely, larger numbers of AgNPs interacted in deeper primary minima on the rougher sand, which is consistent with the predicted influence at concave locations. These findings highlight the importance of surface roughness and indicate that variations in sand surface roughness can greatly change the sensitivity of nanoparticle transport to physicochemical factors such as IS and pH due to the alteration of interaction energy and thus can strongly influence nanoparticle mobility in the environment.

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Section: Release Of Retained Agnps From Quartz Sands With Different Rmentioning

confidence: 99%

Evidence for the critical role of nanoscale surface roughness on the retention and release of silver nanoparticles in porous media

Liang

Zhou

Dong

et al. 2020

Environmental Pollution

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“…The effect of surface morphology on the nature of interparticle and particle-surface interactions has been extensively studied due to shortcomings of established model systems based on spherical particle shapes. The studies often utilize various surface roughness models, including hemispherical, conical and cylindrical protrusions and depressions, [90][91][92][93][94][95] or fractal-like [96][97][98] surface topographies, whereby generally, the introduction of topographic heterogeneities tends to weaken the DLVO interactions, resulting in a decrease in energy barrier height as well as the secondary and primary minimum depths. Due to the statistical nature of many heterogenous surface patterns, they can also locally contribute to the inversion of this tendency.…”

Section: Particle Morphology and Dlvo Interactionsmentioning

confidence: 99%

Morphology-Controlled Synthesis of Colloidal Polyphenol Particles from Aqueous Solutions of Tannic Acid

Kämäräinen

Ago

Greca

et al. 2019

ACS Sustainable Chem. Eng.

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The properties and application of particulate systems can be tailored by gaining control on their morphology. Here, a facile method is described for the bottom-up synthesis of biobased colloidal particles with varied morphologies by simple aqueous oxidation of tannic acid used as a precursor in alkaline solutions. Initial tannic acid concentrations of 1−2 wt % produce the largest crystalline yields, while total precipitate yields (up to 64%) are achieved at 2 wt %. Structural and thermochemical evaluations are reported from measurements based on X-ray diffraction and thermogravimetry, as well as infrared, mass, nuclear magnetic resonance, and X-ray photoelectron spectroscopies. The analyses suggest a galloyl-rich composition of the particles with thermal stability up to 450−500 °C. We show that the selection of the base species and pH affords control of the particle morphologies that include rods, platelets, rhomboids, cuboids, and quasi-spherical shapes. The main cause−effect relations are elucidated from principal component analysis of process conditions and particle morphogenetic parameters, which are derived from their physical dimensions and yield. The results indicate an anticorrelation between base countercation ionic radius and particle volume, whereas base strength and initial solution pH correlate with the total precipitate yield and elongated morphologies, respectively.

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“…12,30 Furthermore, the influence of incompressible nanoscale roughness will change with the solution chemistry, the colloid size, the surface charges, and the water velocity. 12,16,28,31 Theoretical calculations have demonstrated that specific incompressible nanoscale roughness properties can greatly diminish colloid retention and aggregation, even when interactions for smooth surfaces are predicted to be favorable. 12,32 Spatial variability of incompressible roughness properties can explain why limited amounts of colloid aggregation and retention can occur.…”

Section: ■ Introductionmentioning

confidence: 99%

“…12,32 Spatial variability of incompressible roughness properties can explain why limited amounts of colloid aggregation and retention can occur. 17,31,33 Compressible roughness may also occur on natural or engineered surfaces because of the adsorption of organic compounds such as polymers, surfactants, proteins, biological exudates, and humic materials. 5 These macromolecular coatings can exhibit different configurations on a surface depending on its curvature and the adsorbed layer properties (e.g., molecular weight, adsorption density, and layer thickness).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Incompressible nanoscale roughness on mineral and metal surfaces will reduce colloid mass transfer to this surface by increasing the hydrodynamic slip. − In addition, interaction energies have frequently been demonstrated to be highly dependent on the incompressible nanoscale roughness properties of both surfaces . In particular, small amounts of incompressible nanoscale roughness protrusions that are specific to a colloid or porous medium ,,,, have been shown to dramatically decrease the magnitudes of the primary minimum, energy barrier height, and the secondary minimum, − especially when nanoscale roughness occurs on both interacting surfaces. , Furthermore, the influence of incompressible nanoscale roughness will change with the solution chemistry, the colloid size, the surface charges, and the water velocity. ,,, Theoretical calculations have demonstrated that specific incompressible nanoscale roughness properties can greatly diminish colloid retention and aggregation, even when interactions for smooth surfaces are predicted to be favorable. , Spatial variability of incompressible roughness properties can explain why limited amounts of colloid aggregation and retention can occur. ,, …”

Section: Introductionmentioning

confidence: 99%

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Colloid Interaction Energies for Surfaces with Steric Effects and Incompressible and/or Compressible Roughness

et al. 2021

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Colloid aggregation and retention in the presence of macromolecular coatings (e.g., adsorbed polymers, surfactants, proteins, biological exudates, and humic materials) have previously been correlated with electric double layer interactions or repulsive steric interactions, but the underlying causes are not fully resolved. An interaction energy model that accounts for double layer, van der Waals, Born, and steric interactions as well as nanoscale roughness and charge heterogeneity on both surfaces was extended, and theoretical calculations were conducted to address this gap in knowledge. Macromolecular coatings may produce steric interactions in the model, but non-uniform or incomplete surface coverage may also create compressible nanoscale roughness with a charge that is different from the underlying surface. Model results reveal that compressible nanoscale roughness reduces the energy barrier height and the magnitude of the primary minimum at separation distances exterior to the adsorbed organic layer. The depth of the primary minimum initially alters (e.g., increases or decreases) at separation distances smaller than the adsorbed organic coating because of a decrease in the compressible roughness height and an increase in the roughness fraction. However, further decreases in the separation distance create strong steric repulsion that dominates the interaction energy profile and limits the colloid approach distance. Consequently, adsorbed organic coatings on colloids can create shallow primary minimum interactions adjacent to organic coatings that can explain enhanced stability and limited amounts of aggregation and retention that have commonly been observed. The approach outlined in this manuscript provides an improved tool that can be used to design adsorbed organic coatings for specific colloid applications or interpret experimental observations.

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Interactions between nanoparticles and fractal surfaces

Cited by 33 publications

References 51 publications

Evidence for the critical role of nanoscale surface roughness on the retention and release of silver nanoparticles in porous media

Evidence for the critical role of nanoscale surface roughness on the retention and release of silver nanoparticles in porous media

Morphology-Controlled Synthesis of Colloidal Polyphenol Particles from Aqueous Solutions of Tannic Acid

Colloid Interaction Energies for Surfaces with Steric Effects and Incompressible and/or Compressible Roughness

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