Stability Analysis of Three-Dimensional Colloidal Domains:  Quadratic Fluctuations

Wu, Juan; Cao, Jianshu

doi:10.1021/jp0524431

Cited by 8 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DFT can also give insights into the relative stability of various cluster shapes. 76 Assuming that the main free energy of the clusters can be split between surface and core contributions, different cluster morphologies can be compared. This approach shows that models with SALR interactions can give rise to equilibrium cluster shapes that are far from spherical.…”

Section: ■ Liquid-state Theorymentioning

confidence: 99%

Recent Advances in the Theory and Simulation of Model Colloidal Microphase Formers

Zhuang

Charbonneau

2016

J. Phys. Chem. B

View full text Add to dashboard Cite

This mini-review synthesizes our understanding of the equilibrium behavior of particle-based models with short-range attractive and long-range repulsive (SALR) interactions. These models, which can form stable periodic microphases, aim to reproduce the essence of colloidal suspensions with competing interparticle interactions. Ordered structures, however, have yet to be obtained in experiments. In order to better understand the hurdles to periodic microphase assembly, marked theoretical and simulation advances have been made over the past few years. Here, we present recent progress in the study of microphases in models with SALR interactions using liquid-state theory and density-functional theory as well as numerical simulations. Combining these various approaches provides a description of periodic microphases, and gives insights into the rich phenomenology of the surrounding disordered regime. Ongoing research directions in the thermodynamics of models with SALR interactions are also presented.

show abstract

Section: ■ Liquid-state Theorymentioning

confidence: 99%

Recent Advances in the Theory and Simulation of Model Colloidal Microphase Formers

Zhuang

Charbonneau

2016

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…A realistic framework for the modelization of these systems is represented by DLVO interaction potentials [16], which combine short-range attractions and long-range repulsions. A suited choice of DLVO models has in fact allowed to reproduce, by means of molecular dynamics calculations, many experimental observations, like the cluster phase and the gel-like slow dynamics [13][14][15].On the other hand, competing interactions have been studied in many other systems, ranging from spin systems to aqueous surfactants or mixtures of block copolymers, and often lead to pattern formation or to the creation of periodic phases [17][18][19][20][21][22][23].In this paper, we simulate by molecular dynamics a system composed of monodisperse particles, interacting with a short range attraction and a long range repulsion in analogy with DLVO models, for a large range of temperatures and volume fractions. At low temperature, increasing the volume fraction in the region of phase space where the system forms a percolating network and waiting long enough, we observe that the system spontaneously orders, to form a periodic structure composed by parallel columns of particles.…”

mentioning

confidence: 99%

“…On the other hand, competing interactions have been studied in many other systems, ranging from spin systems to aqueous surfactants or mixtures of block copolymers, and often lead to pattern formation or to the creation of periodic phases [17][18][19][20][21][22][23].…”

mentioning

confidence: 99%

Columnar and lamellar phases in attractive colloidal systems

et al. 2006

View full text Add to dashboard Cite

In colloidal suspensions, at low volume fraction and temperature, dynamical arrest occurs via the growth of elongated structures, that aggregate to form a connected network at gelation. Here we show that, in the region of parameter space where gelation occurs, the stable thermodynamical phase is a crystalline columnar one. Near and above the gelation threshold, the disordered spanning network slowly evolves and finally orders to form the crystalline structure. At higher volume fractions the stable phase is a lamellar one, that seems to have a still longer ordering time.PACS numbers: 82.70. Dd, 64.60.Ak, 82.70.Gg In colloidal suspensions solid (or liquid) mesoscopic particles are dispersed in another substance. These systems, like blood, proteins in water, milk, black ink or paints, are important in our everyday lives, in biology and industry [1,2]. It is crucial, for example, to control the process of aggregation in paint and paper industries [3], or to favour the protein crystallization in the production of pharmaceuticals and photonic crystals [4,5].A practical and exciting feature of colloidal suspensions is that the interaction energy between particles can be well controlled [6][7][8]. In fact particles can be coated and stabilized leading to a hard sphere behaviour, and an attractive depletion interaction can be brought out by adding some non-adsorbing polymers. The range and strength of the potential are controlled respectively by the size and concentration of the polymer [8,9]. Recent experimental works highlighted the presence of a net charge on colloidal particles [7,10] giving rise to a long range electrostatic repulsion in addition to the depletion attraction.The competition between attractive and repulsive interactions produces a rich phenomenology and a complex behavior as far as structural and dynamical properties are concerned. For particular choices of the interaction parameters, the aggregation of particles is favoured but the liquid-gas phase transition can be avoided and the cluster size can be stabilized at an optimum value [11]. Experimentally, such a cluster phase made of small equilibrium monodisperse clusters is observed using confocal microscopy at low volume fraction and low temperature (or high attraction strength) [7,10,12]. Increasing the volume fraction, the system is transformed from an ergodic cluster liquid into a nonergodic gel [10,12], where structural arrest occurs. Using molecular dynamic simulations, we showed that such structural arrest is crucially related to the formation of a long living spanning cluster, providing evidence for the percolation nature of the colloidal gel transition at low volume fraction and low temperature [13,14]. This scenario was confirmed by recent experiments [10] and molecular dynamics simulations [15], where it was shown that increasing the volume fraction clusters coalesce into elongated structures eventually forming a disordered spanning network. A realistic framework for the modelization of these systems is represented by DLVO interaction p...

show abstract

“…Our approach can be generalized to investigate other inorganic and organic elastic membrane systems, [35][36][37] including the self-assembled polymer materials and colloidal aggregations. 38,39 In the actual devices, the deformed SWCNT may be supported by the substrate. The present results provide the theoretical boundary for this CNT-based devices.…”

Section: Discussionmentioning

confidence: 99%

“…Our approach can be generalized to investigate other inorganic and organic elastic membrane systems [35,36], including the self-assembled polymer materials and colloidal aggregations. [37,38]…”

mentioning

confidence: 99%

Shape transition of unstrained flattest single-walled carbon nanotubes under pressure

Cao

Ouyang

2014

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Single walled carbon nanotube's (SWCNT's) cross section can be flattened under hydrostatic pressure. One example is the cross section of a single walled carbon nanotube successively deforms from the original round shape to oval shape, then to peanut-like shape. At the transition point of reversible deformation between convex shape and concave shape, the side wall of nanotube is flattest. This flattest tube has many attractive properties. In the present work, an approximate approach is developed to determine the equilibrium shape of this unstrained flattest tube and the curvature distribution of this tube. Our results are in good agreement with recent numerical results, and can be applied to the study of pressure controlled electric properties of single walled carbon nanotubes. The present method can also be used to study other deformed inorganic and organic tube-like structures. V C 2014 AIP Publishing LLC. [http://dx

show abstract

Stability Analysis of Three-Dimensional Colloidal Domains: Quadratic Fluctuations

Cited by 8 publications

References 37 publications

Recent Advances in the Theory and Simulation of Model Colloidal Microphase Formers

Recent Advances in the Theory and Simulation of Model Colloidal Microphase Formers

Columnar and lamellar phases in attractive colloidal systems

Shape transition of unstrained flattest single-walled carbon nanotubes under pressure

Contact Info

Product

Resources

About