Efficient quenching sheds light on early stages of gold nanoparticle formation

Biegel, Markus; Schikarski, Tobias; Cardenas Lopez, Paola; Gromotka, Lukas; Lübbert, Christian; Völkl, Andreas; Damm, Cornelia; Walter, Johannes; Peukert, Wolfgang

doi:10.1039/d3ra02195e

Cited by 8 publications

(1 citation statement)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This formation mechanism involving a rapid burst of nucleation followed by growth through aggregation has been previously reported by Polte et al for gold nanoparticles synthesized using a similar method, albeit without visual evidence. 61 Biegel et al recently showed that the PSD of their synthesized Au NPs approached a selfsimilar distribution with a geometric standard deviation of 1.32 62 as shown by Lee 63 for processes dominated by Brownian coagulation. The final PSDs of this work approach a constant value of 1.21 for the geometric standard deviation, which is in a similar range but indicates that aggregation is not the only growth mechanism.…”

Section: Microscopic View On the Formation Of Silver− Gold Alloy Nano...mentioning

confidence: 90%

Tailoring the Reaction Pathway for Control of Size and Composition of Silver–Gold Alloy Nanoparticles

Traoré,

Berthold,

Hartmann

et al. 2024

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

In this work, we independently tune both the particle size and the chemical composition of bimetallic silver−gold alloy nanoparticles (NPs) by carefully controlling the reaction pathway. NP synthesis involves control of the supersaturation profile in time and space. For the reaction-controlled case, this supersaturation profile is determined by a network of reactions leading to the buildup of the monomer concentration. Using a variety of characterization tools, we show how the process conditions influence the coupled reactions in the complex formation mechanism of Ag−Au alloy NPs. Applying a simple mass balance allows for the independent control of size and chemical composition of these NPs, yielding particles with constant composition and varying size in the range of 20 to 40 nm. A series of constant sizes and varying chemical compositions in the range of 10% to 100% molar gold content is also possible. Our new methodology shows an example of how reaction networks can be tailored to achieve targeted NP properties and paves the way for better control in the synthesis of multicomponent NPs.

show abstract

Section: Microscopic View On the Formation Of Silver− Gold Alloy Nano...mentioning

confidence: 90%

Tailoring the Reaction Pathway for Control of Size and Composition of Silver–Gold Alloy Nanoparticles

Traoré,

Berthold,

Hartmann

et al. 2024

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

Effective Thermal Conductivity of Cyclohexane-Based Nanofluids Containing Cerium Dioxide Nanoparticles with Chemisorbed Organic Shell

Bioucas,

Wu,

Stiegler

et al. 2024

Int J Thermophys

View full text Add to dashboard Cite

In the present study, the effective thermal conductivity λeff of nanofluids containing metal oxide nanoparticles with a chemisorbed organic shell was investigated experimentally and theoretically. The model systems synthesized by a continuous-flow hydrothermal method consist of cyclohexane as organic base fluid and dispersed nearly spherical cerium dioxide (CeO2) core nanoparticles with a decanoic acid shell chemically attached to their surface. From the differences between the hydrodynamic diameters of the two core–shell nanoparticle types with (8.6 or 9.1) nm determined by dynamic light scattering (DLS) and the nearly spherical CeO2 core diameters obtained by analytical ultracentrifugation (AUC) and transmission electron microscopy (TEM), an estimation for the thickness of the entire hydrodynamic layer around the particle core in the range of about (1.1 to 1.3) nm could be deduced. Experimental data for λeff of the nanofluids and the thermal conductivity of the base fluid λbf were determined with a steady-state guarded parallel-plate instrument (GPPI) with an expanded (k = 2) relative uncertainty of 0.026 at atmospheric pressure over a temperature range from (283.15 to 313.15) K in steps of 10 K. The measurement results for the thermal-conductivity ratio λeff ·λbf–1 are independent of temperature and increase with increasing volume fraction of the CeO2 core nanoparticles up to about 0.023. It was found that the experimental results can be described by the Hamilton–Crosser model within their experimental uncertainties for all temperatures investigated.

show abstract

Characterization of complex particle properties by mobility-classified mass spectrometry – A case study for glutathione capped gold nanoclusters

Lübbert,

Peukert

2024

Journal of Aerosol Science

View full text Add to dashboard Cite

Efficient quenching sheds light on early stages of gold nanoparticle formation

Abstract: Quenching by glutathione enables visualization of intermediate stages of the gold nanoparticle formation. A T-mixer allows precise control of the particle size distribution via the Reynolds number Re.

Cited by 8 publications

References 62 publications

Tailoring the Reaction Pathway for Control of Size and Composition of Silver–Gold Alloy Nanoparticles

Tailoring the Reaction Pathway for Control of Size and Composition of Silver–Gold Alloy Nanoparticles

Effective Thermal Conductivity of Cyclohexane-Based Nanofluids Containing Cerium Dioxide Nanoparticles with Chemisorbed Organic Shell

Characterization of complex particle properties by mobility-classified mass spectrometry – A case study for glutathione capped gold nanoclusters

Contact Info

Product

Resources

About