Self-assembly of Janus particles into helices with tunable pitch

Fernández, Mario Sobrino; Peeters, F. M.

doi:10.1103/physreve.92.042309

Cited by 16 publications

(21 citation statements)

References 40 publications

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“…In most of the previous studies, VDW forces are not considered in Au-coated Janus colloid systems, since they are believed to be much weaker than the hydrophobic forces. 18,19,29 However, in our system, VDW interaction has to be considered to explain the cluster formation in the presence of the surfactant. Since Au has a large Hamaker constant, 30 the Au coating layer may generate significant VDW attractions when particles are in close proximity even though the layer is ∼1% of the total diameter.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Surfactant-Mediated Assembly of Amphiphilic Janus Spheres

et al. 2019

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We investigate how amphiphilic Janus particle assembly structures, including clusters and striped twodimensional (2D) crystals, are influenced by the addition of surfactant molecules. Janus particles are fabricated using silica particles coated with Au on one side, which is further modified with a hydrophobic self-assembled monolayer. Analysis on the cluster assembly structures suggests that in addition to hydrophobic attraction, van der Waals (VDW) attraction plays a significant role in the assembly process, which is modulated by the Au coating thickness. This is manifested by the cluster formation induced primarily by VDW forces when the hydrophobic attraction between particles is diminished by adding the surfactant. In the 2D crystal case, sodium dodecyl sulfate (SDS) and Tween 20 show opposite trends in how they affect assembly structures and particle dynamics. SDS shortens the stripes in 2D crystals and accelerates the rotation of particles, whereas Tween 20 extends the straight stripes and slows down the particle rotation. We interpret the results by considering SDS adsorption on the Au-coated hemisphere of the Janus particles and Tween 20 forming hydrogen bonds with the silica hemisphere of Janus particles. Our study offers a simple approach to change the assembly structures of Janus particles, and it provides principles and guidance for potential applications of Janus particles coupled with small amphiphilic molecules.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Surfactant-Mediated Assembly of Amphiphilic Janus Spheres

et al. 2019

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“…(3). These continuous potentials have been used to look at self-assembled ordered structures in patchy systems [29,[51][52][53][54], but they have been employed also in modelling patchy polymers [55] and even amino acids in proteins [2].…”

Section: Fig 1 a Cartoon Showing Particles Decorated With Single Pamentioning

confidence: 99%

How to simulate patchy particles

2018

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Patchy particles is the name given to a large class of systems of mesoscopic particles characterized by a repulsive core and a discrete number of short-range and highly directional interaction sites. Numerical simulations have contributed significantly to our understanding of the behaviour of patchy particles, but, although simple in principle, advanced simulation techniques are often required to sample the low temperatures and long time-scales associated with their self-assembly behaviour. In this work we review the most popular simulation techniques that have been used to study patchy particles, with a special focus on Monte Carlo methods. We cover many of the tools required to simulate patchy systems, from interaction potentials to biased moves, cluster moves, and free-energy methods. The review is complemented by an educationally oriented Monte Carlo computer code that implements all the techniques described in the text to simulate a well-known tetrahedral patchy particle model.

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“…Recently, analogous simulations have been carried out for Janus spheres in a circular symmetric harmonic trap. 31 A variety of ordered membrane-like morphologies has been found consisting of single chains, multiple helices, and Bernal spirals. The behavior of amphiphilic JPs in two-dimensional slits has been explored using Monte Carlo simulations.…”

Section: ■ Introductionmentioning

confidence: 99%

Self-Assembly of Amphiphilic Janus Particles Confined between Two Solid Surfaces

2020

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We use Monte Carlo simulations to investigate the behavior of Janus spheres confined between two parallel surfaces. Janus particles are composed of attractive and repulsive parts. The slits with identical and competing walls are considered. In the studied systems, we have found (i) the two-dimensional crystallization of clusters, (ii) the surface-induced formation of “levitating” slabs, and (iii) “inverted” adsorption in Janus-like pores. The mechanism of the formation of particular structures is discussed in detail. Bond orientation analysis is used to identify crystalline phases. We have analyzed the impact of selected parameters on the morphology of the considered systems.

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Self-assembly of Janus particles into helices with tunable pitch

Cited by 16 publications

References 40 publications

Surfactant-Mediated Assembly of Amphiphilic Janus Spheres

Surfactant-Mediated Assembly of Amphiphilic Janus Spheres

How to simulate patchy particles

Self-Assembly of Amphiphilic Janus Particles Confined between Two Solid Surfaces

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