Kinetics of aggregation in liquids with dispersed nanoparticles

Jeżewski, W.

doi:10.1039/c4cp05401f

Cited by 4 publications

(1 citation statement)

References 63 publications

(195 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14,15 In general, the dispersed NPs reveal a strong tendency to reduce the surface free energy via, among others, aggregation, agglomeration and attachment of molecules or molecular blocks of liquid media by NPs. 16 NP aggregation depends on the type and composition of electrolyte, ionic strength, pH, their size and capping agent. 6 It also strongly affects NP reactivity by changing reactive surface area geometry and transport properties.…”

Section: Introductionmentioning

confidence: 99%

Employment of electrostatic interactions for amperometric detection of carbon nanoparticles in a FIA system

Ogończyk

Gocyla

Opałło

2016

Analyst

View full text Add to dashboard Cite

The development of methods for nanoparticle detection is highly desirable due to their increasing presence in the environment. Recently, we have shown that the electrochemical detection in flow is one of the possible solutions. Here we demonstrate a dramatic improvement of analytical parameters of such detection. The significant enhancement of an amperometric signal resulting from the electrocatalytic oxidation of ascorbic acid (AA) in a negatively charged phenylsulphonated carbon nanoparticle suspension in the millifluidic flow injection analysis system as compared to earlier results (D. Ogończyk, et al., Electrochem. Commun., 2014, 43, 40) is presented. This effect results from the tailoring of electrostatic interactions, e.g. optimization of the supporting electrolyte and AA concentration and/or immobilization of positively charged functionalities at the electrode surface. The sensitivity is improved by almost three orders of magnitude and the limit of detection of carbon nanoparticles is decreased by two orders of magnitude down to 0.001 mg mL(-1).

show abstract

Section: Introductionmentioning

confidence: 99%

Employment of electrostatic interactions for amperometric detection of carbon nanoparticles in a FIA system

Ogończyk

Gocyla

Opałło

2016

Analyst

View full text Add to dashboard Cite

show abstract

Nanoparticles without and with protein corona: van der Waals and hydration interaction

Zhdanov

2019

J Biol Phys

View full text Add to dashboard Cite

The van der Waals (vdW) interaction between nanoparticles (NPs) in general, and especially between metal NPs, may be appreciable, and may result in nanoparticle aggregation. In biofluids, NPs become rapidly surrounded by a protein corona (PC). Here, the vdW and hydration interaction of NPs with and without PC are compared in detail. The focus is on two widely used types of NPs fabricated of SiO 2 and Au and possessing weak and strong vdW interactions, respectively. For SiO 2 , the presence of PC increases the vdW interaction, but it remains relatively weak and insufficient for aggregation. For Au, the presence of PC decreases the vdW interaction, and in the case of small NPs (≤ 40 nm in diameter) it may become insufficient for aggregation as well while the larger NPs can aggregate.

show abstract

Effect of long-range interactions on nanoparticle-induced aggregation

Jeżewski

2016

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

The process of attaching liquid media molecules to dispersed nanoparticles is studied by numerically investigating the time evolution of the size distribution of the emerging aggregates. Within the considered mechanism of aggregation, both the primary particles and the resulting aggregates are assumed to connect freely dispersing molecules, but the particles and aggregates are not allowed to self-link or self-assemble at each evolution stage of the system, due to, e.g., repulsive interactions. The process of random attachment of dispersing molecules to immersed nanoparticles and aggregates is considered to be driven by attractive long-range interactions of the van der Waals type. The molecule binding rate is, in consequence, modeled as being dependent not only on the size and surface morphology of the existing aggregates, but also on the van der Waals forces, whose strength is itself treated as dependent on the aggregate size. It is demonstrated that these forces diminish, in general, the inhomogeneity of aggregate size. Such an effect is shown to be especially distinct when the interaction strength is relatively large but does not increase as aggregates increase in size, i.e., when strongly attracted media molecules functionalize the resultant aggregates to prevent the increase of the interaction strength. This result can be helpful to construct stable complex substances containing aggregates with low size dispersion. Surprisingly, the evolution of aggregating systems toward more significant inhomogeneity takes place when the interaction strength is initially large and increases fast enough with the size of aggregates.

show abstract

Kinetics of aggregation in liquids with dispersed nanoparticles

Cited by 4 publications

References 63 publications

Employment of electrostatic interactions for amperometric detection of carbon nanoparticles in a FIA system

Employment of electrostatic interactions for amperometric detection of carbon nanoparticles in a FIA system

Nanoparticles without and with protein corona: van der Waals and hydration interaction

Effect of long-range interactions on nanoparticle-induced aggregation

Contact Info

Product

Resources

About