Diffusion- and reaction-limited cluster aggregation revisited

Jungblut, Swetlana; Joswig, Jan‐Ole; Eychmüller, Alexander

doi:10.1039/c9cp00549h

Cited by 87 publications

(73 citation statements)

References 52 publications

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“…Nevertheless, the similarity of the structures suggests that the analytical conclusions might qualitatively apply in our case. For instance, we can verify the fact that the morphology of our networks is largely independent on the NP concentration, as suggested by DLCA and RLCA . On the one hand, diluting the NP solution of sample 3a by 20 %, which is the lowest concentration above which we still could find interconnected networks, had a relatively small impact on the network structure with a web thickness of 3.8 nm (compared to 4.3 nm) and fractal dimension of 1.533 (compared to 1.580).…”

Section: Resultssupporting

confidence: 74%

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

et al. 2020

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As there is a great demand of 2D metal networks, especially out of gold for a plethora of applications we show a universal synthetic method via phase boundary gelation which allows the fabrication of networks displaying areas of up to 2 cm2. They are transferred to many different substrates: glass, glassy carbon, silicon, or polymers such as PDMS. In addition to the standardly used web thickness, the networks are parametrized by their fractal dimension. By variation of experimental conditions, we produced web thicknesses between 4.1 nm and 14.7 nm and fractal dimensions in the span of 1.56 to 1.76 which allows to tailor the structures to fit for various applications. Furthermore, the morphology can be tailored by stacking sheets of the networks. For each different metal network, we determined its optical transmission and sheet resistance. The obtained values of up to 97 % transparency and sheet resistances as low as 55.9 Ω/sq highlight the great potential of the obtained materials.

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Section: Resultssupporting

confidence: 74%

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

et al. 2020

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“…[22] We attribute the differences mainly to the flexibility of the obtained structures but cannot rule out the influence of other factors like the restructuration of the NPs or their networks.N evertheless, the similarity of the structures suggests that the analytical conclusions might qualitatively apply in our case.F or instance,w ec an verify the fact that the morphology of our networks is largely independent on the NP concentration, as suggested by DLCAa nd RLCA. [21,39] On the one hand, diluting the NP solution of sample 3a by 20 %, which is the lowest concentration above which we still could find interconnected networks,h ad ar elatively small impact on the network structure with aweb thickness of 3.8 nm (compared to 4.3 nm) and fractal dimension of 1.533 (compared to 1.580). Increasing the NP concentration, on the other hand, caused their fast agglomeration into larger NPs as no stabilizers were present.…”

Section: Resultsmentioning

confidence: 96%

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

et al. 2020

Self Cite

View full text Add to dashboard Cite

As there is a great demand of 2D metal networks, especially out of gold for a plethora of applications we show a universal synthetic method via phase boundary gelation which allows the fabrication of networks displaying areas of up to 2 cm 2 . They are transferred to many different substrates: glass, glassy carbon, silicon, or polymers such as PDMS. In addition to the standardly used web thickness, the networks are parametrized by their fractal dimension. By variation of experimental conditions, we produced web thicknesses between 4.1 nm and 14.7 nm and fractal dimensions in the span of 1.56 to 1.76 which allows to tailor the structures to fit for various applications. Furthermore, the morphology can be tailored by stacking sheets of the networks. For each different metal network, we determined its optical transmission and sheet resistance. The obtained values of up to 97 % transparency and sheet resistances as low as 55.9 Ω/sq highlight the great potential of the obtained materials.

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“…Applying the theoretical approach of colloid engineering [ 20 , 21 ], the authors in their previous research showed that the process of forming a spatial polymer network (gel) from a colloidal chitosan solution in the presence of GP salt proceeds in two stages. Since the amino groups present in the chitosan chain form non-covalent bonds with anionic phosphate groups, it was found that the aggregation rate of particles is not limited only by the phenomenon of their diffusion (diffusion-limited cluster aggregation (DLCA) mechanism [ 22 , 23 , 24 , 25 ]), but will also depend on the resulting interactions between the amino groups and anionic phosphate groups, so-called reaction-limited cluster aggregation (reaction-limited cluster aggregation (RLCA) mechanism [ 22 , 23 , 24 , 25 ]). In the first stage, the charge of the chitosan polyion is neutralized, leading to the precipitation of chitosan chains from the solution, thus creating aggregation nuclei.…”

Section: Introductionmentioning

confidence: 99%

Influence of Glycerophosphate Salt Solubility on the Gelation Mechanism of Colloidal Chitosan Systems

Owczarz

Rył

Sowiński

2021

IJMS

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Recently, thermosensitive chitosan systems have attracted the interest of many researchers due to their growing application potential. Nevertheless, the mechanism of the sol-gel phase transition is still being discussed, and the glycerophosphate salt role is ambiguous. The aim of the work is to analyze the possibility of the exclusive use of a non-sodium glycerophosphate salt and to determine its impact on the gelation conditions determined by rheological and turbidimetric measurements as well as the stability of the systems by measuring changes in the Zeta potential value. It was found that ensuring the same proportions of glycerophosphate ions differing in cation to amino groups present in chitosan chains, leads to obtaining systems significantly different in viscoelastic properties and phase transition conditions. It was clearly shown that the systems with the calcium glycerophosphate, the insoluble form of which may constitute additional aggregation nuclei, undergo the gelation the fastest. The use of magnesium glycerophosphate salt delays the gelation due to the heat-induced dissolution of the salt. Thus, it was unequivocally demonstrated that the formulation of the gelation mechanism of thermosensitive chitosan systems based solely on the concentration of glycerophosphate without discussing its type is incorrect.

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Diffusion- and reaction-limited cluster aggregation revisited

Abstract: We investigated the impact of rotational diffusion on the process of irreversible nanoparticle aggregation.

Cited by 87 publications

References 52 publications

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels

Influence of Glycerophosphate Salt Solubility on the Gelation Mechanism of Colloidal Chitosan Systems

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