Stability of binary colloids: kinetic and structural aspects of heteroaggregation processes

López-López, José Manuel; Schmitt, A.; Moncho-Jordá, A.; Hidalgo‐Álvarez, R.

doi:10.1039/b608349h

Cited by 108 publications

(100 citation statements)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lewis acidbase interactions also led to formation of heteroaggregates in aqueous medium between carboxyl functionalized, SiO 2 -coated maghemite NPs and SiO 2 NPs functionalized with amino groups [99]. In this particular study, chemical bonding was found to be more effective than electrostatic interactions at forming heteroaggregates between the two NPs, although equilibrium was reached much slower than observed in electrostatic interactions which are more instantaneous [99,155]. Both hydrogen bonding and Lewis acid-base interactions were proposed by Yang et al [128] to overcome charge repulsion between graphene oxide and clay materials, leading to heteroaggregation.…”

Section: Chemical Bondingmentioning

confidence: 79%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

171

View full text Add to dashboard Cite

The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

show abstract

Section: Chemical Bondingmentioning

confidence: 79%

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

171

View full text Add to dashboard Cite

show abstract

“…The different colloidal particles usually differ in terms of chemical composition, size, and surface properties. While there is a relative clarity in terms of how to deal with the interaction potential of two different types of particles [101,102], the effect of particle size on the fractal dimension of heteroclusters is less explored, with some noteworthy exceptions [26]. On the other hand, there are very limited experimental insights in this sense, whereas it would be interesting to explore the fractal dimension of clusters obtained in binary aggregation in both stagnant and shear condition.…”

Section: Fractal Dimension In Heteroaggregationmentioning

confidence: 99%

Fractal-like structures in colloid science

Lazzari

Nicoud

Jaquet

et al. 2016

Advances in Colloid and Interface Science

177

126

View full text Add to dashboard Cite

a b s t r a c tThe present work aims at reviewing our current understanding of fractal structures in the frame of colloid aggregation as well as the possibility they offer to produce novel structured materials. In particular, the existing techniques to measure and compute the fractal dimension d f are critically discussed based on the cases of organic/inorganic particles and proteins. Then the aggregation conditions affecting d f are thoroughly analyzed, pointing out the most recent literature findings and the limitations of our current understanding. Finally, the importance of the fractal dimension in applications is discussed along with possible directions for the production of new structured materials.

show abstract

“…Recently, much attention has been devoted to binary colloids in which two types of colloidal particles (types A and B in the following) can acquire opposite charges in suspension, interacting mainly through screened electrostatic forces. Binary colloids can thus aggregate [2][3][4], in a process which is usually called heteroaggregation. The competition between attractive and repulsive forces gives rise to a rich phenomenology, which is the subject of active investigation.…”

Section: Introductionmentioning

confidence: 99%

Kinetically driven ordered phase formation in binary colloidal crystals

2013

View full text Add to dashboard Cite

The aggregation of binary colloids of same size and balanced charges is studied by Brownian dynamics simulations for dilute suspensions. It is shown that, under appropriate conditions, the formation of colloidal crystals is dominated by kinetic effects leading to the growth of well-ordered crystallites of the sodium-chloride (NaCl) bulk phase. These crystallites form with very high probability even when the cesium-chloride (CsCl) phase is more stable thermodynamically. Global optimization searches show that this result is not related to the most favorable structures of small clusters, that are either amorphous or of CsCl structure. The formation of the NaCl phase is related to the specific kinetics of the crystallization process, which takes place by a two-step mechanism. In this mechanism, dense fluid aggregates form at first and then crystallization follows. It is shown that the type of short-range order in these dense fluid aggregates determines which phase is finally formed in the crystallites. The role of hydrodynamic effects in the aggregation process is analyzed by Stochastic Rotation Dynamics -Molecular Dynamics simulations, finding that these effects do not play a major role in the formation of the crystallites.

show abstract

Stability of binary colloids: kinetic and structural aspects of heteroaggregation processes

Cited by 108 publications

References 87 publications

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Fractal-like structures in colloid science

Kinetically driven ordered phase formation in binary colloidal crystals

Contact Info

Product

Resources

About