Nanodroplet Depinning from Nanoparticles

Qi, Liu; Leong, Fong Yew; Aabdin, Zainul; Anand, Utkarsh; Quang, Tran Si Bui; Mirsaidov, Utkur

doi:10.1021/acsnano.5b03078

Cited by 24 publications

(28 citation statements)

References 53 publications

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“…For in situ liquid cell TEM imaging experiments, ∼500 nL of the mixture was drop-casted onto the bottom membrane of our custom microfabricated liquid cell. 26 Each liquid cell consisted of two chips with ultrathin (∼20 nm) electron translucent SiN x windows separated by ∼200 nm thick spacer. The dimensions of the SiN x windows of the liquid cells are 30 μm × 200 μm.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

In Situ Kinetic and Thermodynamic Growth Control of Au–Pd Core–Shell Nanoparticles

et al. 2018

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One-pot wet-chemical synthesis is a simple way to obtain nanoparticles (NPs) with a well-defined shape and composition. However, achieving good control over NP synthesis would require a comprehensive understanding of the mechanisms of NP formation, something that is challenging to obtain experimentally. Here, we study the formation of gold (Au) core-palladium (Pd) shell NPs under kinetically and thermodynamically controlled reaction conditions using in situ liquid cell transmission electron microscopy (TEM). By controlling the reaction temperature, we demonstrate that it is possible to tune the shape of Au nanorods to Au-Pd arrow-headed structures or to cuboidal core-shell NPs. Our in situ studies show that the reaction temperature can switch the Pd shell growth between the kinetically and thermodynamically dominant regimes. The mechanistic insights reported here reveal how the reaction temperature affects the packing of the capping agents and how the facet selection of depositing shell atoms drives the shell formation under different kinetic conditions, which is useful for synthesizing NPs with greater design flexibility in shape and elemental composition for various technological applications.

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Section: ■ Experimental Detailsmentioning

confidence: 99%

In Situ Kinetic and Thermodynamic Growth Control of Au–Pd Core–Shell Nanoparticles

et al. 2018

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“…that such a strong buildup of viscosity in the water remains disputed, our conclusions are very much in line with a wide variety of TEy[ studies, all of which have found highly viscous fluid dynamics of droplets as they interact with surfaces [36], nanoparticles [35,111], and so forth.…”

Section: Discussionsupporting

confidence: 88%

“…), rather than the 6-9 orders that have been claimed. Moreover, our estimate that E "-' 0.1 V /nm is within the region where freezing is observed to occur, despite the fact that liquid than ice is observed in the TEM experiments [36,111,131].…”

Section: S3 Molecular Dynamics Simulationsmentioning

confidence: 71%

“…Unlike the conflicting results observed in surface probe experiments, the experiments performed in the TEM environment universally show evidence of highly damped fluid dynamics. These experiments cover a wide variety of multi-phase phenomena, ranging from droplet merger [38], stick-slip dynamics of droplets sliding across a substrate [36], nanocrystal nucleation [110]. In a recent study, Lu et aI.…”

Section: -4 Inferringmentioning

confidence: 99%

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Exploring the stability and dynamics of nanobubbles

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Nanoscale domains of gas in liquids, known as nanobubbles, have received substantial attention as much for their unusual fundamental properties as for their potential applications in microfluidics or cleaning. Due to the inability of the widely-used atomic force microscopy (AFM) to observe dynamic events, many basic properties of nanobubbles remain to be understood, such the strength of the line pinning that appears to facilitate their remarkable stability. Through experiments, theory and numerical simulations, we resolve some open questions in nanobubbles, with a particular focus on their dynamics and stability mechanisms. x

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“…The liquid cell is made up of two chips: (1) a heater chip with a 50 nm thick silicon nitride (SiN x ) membrane window (Hummingbird Scientific, Lacey, WA, USA) and (2) bottom chip with a 25 nm SiN x window (Supplementary Fig. 1 ) that we fabricated in-house 50 . These chips were first plasma treated before experiments to make their SiN x membrane surfaces hydrophilic, so that liquid can easily wet the interior of the liquid cell.…”

Section: Methodsmentioning

confidence: 99%

Direct observation of the nanoscale Kirkendall effect during galvanic replacement reactions

et al. 2017

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Galvanic replacement (GR) is a simple and widely used approach to synthesize hollow nanostructures for applications in catalysis, plasmonics, and biomedical research. The reaction is driven by the difference in electrochemical potential between two metals in a solution. However, transient stages of this reaction are not fully understood. Here, we show using liquid cell transmission electron microscopy that silver (Ag) nanocubes become hollow via the nucleation, growth, and coalescence of voids inside the nanocubes, as they undergo GR with gold (Au) ions at different temperatures. These direct in situ observations indicate that void formation due to the nanoscale Kirkendall effect occurs in conjunction with GR. Although this mechanism has been suggested before, it has not been verified experimentally until now. These experiments can inform future strategies for deriving such nanostructures by providing insights into the structural transformations as a function of Au ion concentration, oxidation state of Au, and temperature.

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Nanodroplet Depinning from Nanoparticles

Cited by 24 publications

References 53 publications

In Situ Kinetic and Thermodynamic Growth Control of Au–Pd Core–Shell Nanoparticles

In Situ Kinetic and Thermodynamic Growth Control of Au–Pd Core–Shell Nanoparticles

Exploring the stability and dynamics of nanobubbles

Direct observation of the nanoscale Kirkendall effect during galvanic replacement reactions

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