“Janus Beads”: Realization and Behaviour at Water/Oil Interfaces

Fabrication, Assembly, and Application of Patchy Particles

“…Janus Particle -The Special Case Janus particles, named after the two-faced Roman God Janus, are particles with two distinguishable surface areas of equal amounts. [21][22][23] The difference in the properties of the two halves can be hydrophobic/hydrophilic, metallic/ polymer, charged/uncharged, organic/inorganic, or any combination of these. Janus particles were initially introduced by Casagrade et al in 1989, [21] but it took the mention of Janus grains in de Gennes' Nobel Lecture [23] in 1991 to bring these particles to the general attention of researchers worldwide.…”

“…[21][22][23] The difference in the properties of the two halves can be hydrophobic/hydrophilic, metallic/ polymer, charged/uncharged, organic/inorganic, or any combination of these. Janus particles were initially introduced by Casagrade et al in 1989, [21] but it took the mention of Janus grains in de Gennes' Nobel Lecture [23] in 1991 to bring these particles to the general attention of researchers worldwide. Over the last two decades, many fabrication methods for Janus particles have been developed, [14] including scalable ones, and the particles are now being implemented in new technologies such as emulsions, [44,45] electronic paper, [46][47][48] tunable liquid optics, [49] sensors [50] and microrheological probes.…”

“…The two halves of the particle may differ in electrical, chemical, and/or physical properties. Such particles are commonly referred to as Janus particles [21][22][23] and these have been an active area of research for the past two decades. A lot of progress has been made regarding the large-scale fabrication and characterization of Janus particles, as well as toward testing and exploring their applications.…”

Nanophase Segregation of Self-Assembled Monolayers on Gold Nanoparticles

“…Janus particles are composed of two chemically/physically distinct regions, [1][2][3][4][5] which make them suitable for applications including biosensors, nanoscale motors, anti-reflective coatings, optical sensing devices, and two phase stabilizers, building blocks of multiscale materials. [6][7][8][9][10][11][12] Since the late 1980s researchers aim at exploiting the remarkable properties of dissymmetrical particles and, by extension, of particles exhibiting partial segregation between two components.…”

“…30 The aim of this work is the development of rational and reliable models to study the behaviors and properties of mixed organic SAMs at the surface of gold planar surfaces and nanoparticles exhibiting full (Janus) or partial (patchy) phase segregation. We focus on the role of the ligands side chains and their strong inter-chain interactions, such as H-bonds, available within a binary 4 SAM containing ligands specifically designed and available from modern synthetic chemistry. In particular, we analyze planar gold surfaces immersed in water and capped with single-or bicomponent thiol SAMs.…”