Hierarchical Nanoparticle Ensembles Synthesized by Liquid Phase Directed Self-Assembly

Fowlkes, Jason D.; Roberts, Nick A.; Wu, Yegang; Diez, Javier A.; González, Antonio Bueno; Hartnett, Chris; Mahady, Kyle; Afkhami, Shahriar; Kondic, Lou; Rack, Philip D.

doi:10.1021/nl404128d

Cited by 43 publications

(52 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The stability properties of such films have been a subject of recent interest in connection with nanoparticle fabrication (see e.g. [1,3,[30][31][32][33]). In experiments, a film of metal, with thickness on the order of tens of nanometers, is deposited on a surface.…”

Section: Film Instability: Nonlinear Evolution and Breakup -2dmentioning

confidence: 99%

See 1 more Smart Citation

A numerical approach for the direct computation of flows including fluid-solid interaction: Modeling contact angle, film rupture, and dewetting

2016

Self Cite

View full text Add to dashboard Cite

In this paper, we present a computationally efficient method for including fluid-solid interactions into direct numerical simulations of the Navier-Stokes equations. This method is found to be as powerful as our earlier formulation [J. Comp. Phys., vol. 249: 243 (2015)], while outperforming the earlier method in terms of computational efficiency. The performance and efficacy of the presented method are demonstrated by computing contact angles of droplets at equilibrium. Furthermore, we study the instability of films due to destabilizing fluid-solid interactions, and discuss the influence of contact angle and inertial effects on film breakup. In particular, direct simulation results show an increase in the final characteristic length scales when compared to the predictions of a linear stability analysis, suggesting significant influence of nonlinear effects. Our results also show that emerging length scales differ, depending on a number of physical dimensions considered. arXiv:1509.07592v2 [physics.flu-dyn]

show abstract

Section: Film Instability: Nonlinear Evolution and Breakup -2dmentioning

confidence: 99%

“…[24][25][26][27]). Both slip and disjoining pressure approaches have been extensively used to model a variety of problems including wetting, dewetting, and film breakup, in particular in the context of polymer [28,29] and metal [1,3,4,[30][31][32][33] films.…”

Section: Introductionmentioning

confidence: 99%

A numerical approach for the direct computation of flows including fluid-solid interaction: Modeling contact angle, film rupture, and dewetting

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…This evolution is typically unstable due to the presence of destabilizing forces, in particular involving liquid metal-solid substrate interactions [3]. In addition to its scientific interest, understanding these instabilities and the subsequent dynamics is further motivated by their potential to drive various selfand directed-assembly mechanisms in a variety of contexts; only some examples are cited here [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal effects on stability of nanoscale films and filaments on thermally conductive substrates

2018

View full text Add to dashboard Cite

We consider films and filaments of nanoscale thickness on thermally conductive substrates exposed to external heating. Particular focus is on metal films exposed to laser irradiation. Due to short length scales involved, the absorption of heat in the metal is directly coupled to the film evolution, since the absorption length and the film thickness are comparable. Such a setup requires selfconsistent consideration of fluid mechanical and thermal effects. We approach the problem via Volume-of-Fluid based simulations that include destabilizing liquid metal-solid substrate interaction potentials. These simulations couple fluid dynamics directly with the spatio-temporal evolution of the temperature field both in the fluid and in the substrate. We focus on the influence of the temperature variation of material parameters, in particular of surface tension and viscosity. Regarding variation of surface tension with temperature, the main finding is that while Marangoni effect may not play a significant role in the considered setting, the temporal variation of surface tension (modifying normal stress balance) is significant and could lead to complex evolution including oscillatory evolution of the liquid metal-air interface. Temperature variation of film viscosity is also found to be relevant. Therefore, the variations of surface tensions and viscosity could both influence the emerging wavelengths in experiments. In contrast, the filament geometry is found to be much less sensitive to a variation of material parameters with temperature.

show abstract

“…One approach to produce desired nanoscale structures (metallic or not) with prescribed size and distribution is to resort to naturally occurring forces that drive the evolution of instabilities in the liquid phase [9] from an initially patterned nanostructure. Such an approach, if conveniently controlled, is significantly more efficient than lithographically depositing individual particles.…”

Section: Introductionmentioning

confidence: 99%

Drop pattern resulting from the breakup of a bidimensional grid of liquid filaments

et al. 2017

View full text Add to dashboard Cite

A rectangular grid formed by liquid filaments on a partially wetting substrate evolves in a series of breakups leading to arrays of drops with different shapes distributed in a rather regular bidimensional pattern. Our study is focused on the configuration produced when two long parallel filaments of silicone oil, which are placed upon a glass substrate previously coated with a fluorinated solution, are crossed perpendicularly by another pair of long parallel filaments. A remarkable feature of this kind of grids is that there are two qualitatively different types of drops. While one set is formed at the crossing points, the rest are consequence of the breakup of shorter filaments formed between the crossings. Here, we analyze the main geometric features of all types of drops, such as shape of the footprint and contact angle distribution along the drop periphery. The formation of a series of short filaments with similar geometric and physical properties allows us to have simultaneously quasi identical experiments to study the subsequent breakups. We develop a simple hydrodynamic model to predict the number of drops that results from a filament of given initial length and width. This model is able to yield the length intervals corresponding to a small number of drops and its predictions are successfully compared with the experimental data as well as with numerical simulations of the full Navier-Stokes equation that provide a detailed time evolution of the dewetting motion of the filament till the breakup into drops. Finally, the prediction for finite filaments is contrasted with the existing theories for infinite ones.

show abstract

Hierarchical Nanoparticle Ensembles Synthesized by Liquid Phase Directed Self-Assembly

Cited by 43 publications

References 47 publications

A numerical approach for the direct computation of flows including fluid-solid interaction: Modeling contact angle, film rupture, and dewetting

A numerical approach for the direct computation of flows including fluid-solid interaction: Modeling contact angle, film rupture, and dewetting

Influence of thermal effects on stability of nanoscale films and filaments on thermally conductive substrates

Drop pattern resulting from the breakup of a bidimensional grid of liquid filaments

Contact Info

Product

Resources

About