Self-Assembly and Water-like Anomalies in Janus Nanoparticles

Bordin, José Rafael; Krott, Leandro B.; Barbosa, Márcia C.

doi:10.1021/acs.langmuir.5b01555

Cited by 23 publications

(38 citation statements)

References 53 publications

(131 reference statements)

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“…Such systems may include, for instance, elongated molecules, polymers and colloidal dimers, whose experimental realization 49,50 along with theoretical models 51,52 are currently object of increasing interest.…”

Section: Discussionmentioning

confidence: 99%

Density and structural anomalies in soft-repulsive dimeric fluids

Munaò

Saija

2016

Phys. Chem. Chem. Phys.

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We report Monte Carlo results for the fluid structure of a system of dimeric particles interacting via a core-softened potential. More specifically, dimers interact through a repulsive pair potential of inverse-power form, modified in such a way that the repulsion strength is softened in a given range of distances. The aim of such a study is to investigate how both the elongation of the dimers and the softness of the potential affect some features of the model. Our results show that the dimeric fluid exhibits both density and structural anomalies even if the interaction is not characterized by two length scales. Upon increasing the aspect ratio of the dimers, such anomalies are progressively hindered, with the structural anomaly surviving even after the disappearance of the density anomaly. These results shed light on the peculiar behaviour of molecular systems of non-spherical shape, showing how geometrical and interaction parameters play a fundamental role for the presence of anomalies.

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Section: Discussionmentioning

confidence: 99%

Density and structural anomalies in soft-repulsive dimeric fluids

Munaò

Saija

2016

Phys. Chem. Chem. Phys.

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“…There is a 25 orders of magnitude difference between nanosilica as well as microsilica. This is same for both repulsive r 12 and also attractive r 6 terms. Both terms have the same 25 orders of magnitude difference in each of repulsive and attractive terms of L -J 6 -12 potential.…”

Section: Hydrophobic Performancementioning

confidence: 56%

“…Hence we can have corrosion control with hydrophobic aspect of nano silica is apparent. In the study of [12] the nanoparticle potential with Lennard -Jones 6 -12 relation is modified with one more term. The joint between two nanoparticles is not actually 2 full spheres but a -"Janus dumbbell" shape.…”

Section: Frictionmentioning

confidence: 99%

Atom – Bond Organization Theory and a New Intermolecular Force for Applications Such as Ultrahydrophobic Materials

Thirunavukkarasu¹,

Ramkumar²

2020

International Journal of Applied Engineering Research

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A new intermolecular force comparable to Van Der Waals force leads to high friction in amorphous nanopowders of silica. The radial distribution function can be applied both at particle-to-particle level as well as atoms/molecules inside a nanoparticle usually amorphous nanoparticle. Hydrophobic performance and corrosion control can be of big impact with high intermolecular force intensity. Here we also study friction due to this force in terms of powder rather than bulk materials friction property. High friction, high Van Der Waals related intermolecular force and unusual high repulsion between nanoparticles clinches the existence of this force. The ultrahydrophobic performance with near maximum water contact angle positions this field for corrosion control in vast application contexts. We conclude with a discovery of a new intermolecular force only in amorphous nanopowders and its relevance as a nanotechnology application research also.

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“…to the percolating densities (< n c /N >= 1). This is a indicative of a phase transition from the clustering to the percolating regions [58]. Then, the points < n c /N >= 1.0 were considered as percolations phases, and when < n c /N >< 1.0 the colloids were in the cluster phase, region I.…”

Section: Resultsmentioning

confidence: 99%

Distinct aggregation patterns and fluid porous phase in a 2D model for colloids with competitive interactions

Bordin

2018

Physica A: Statistical Mechanics and its Applications

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In this paper we explore the self-assembly patterns in a two dimensional colloidal system using extensive Langevin Dynamics simulations. The pair potential proposed to model the competitive interaction have a short range length scale between first neighbors and a second characteristic length scale between third neighbors. We investigate how the temperature and colloidal density will affect the assembled morphologies. The potential shows aggregate patterns similar to observed in previous works, as clusters, stripes and porous phase. Nevertheless, we observe at high densities and temperatures a porous mesophase with a high mobility, which we name fluid porous phase, while at lower temperatures the porous structure is rigid. triangular packing was observed for the colloids and pores in both solid and fluid porous phases. Our results show that the porous structure is well defined for a large range of temperature and density, and that the fluid porous phase is a consequence of the competitive interaction and the random forces from the Langevin Dynamics.

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Self-Assembly and Water-like Anomalies in Janus Nanoparticles

Cited by 23 publications

References 53 publications

Density and structural anomalies in soft-repulsive dimeric fluids

Density and structural anomalies in soft-repulsive dimeric fluids

Atom – Bond Organization Theory and a New Intermolecular Force for Applications Such as Ultrahydrophobic Materials

Distinct aggregation patterns and fluid porous phase in a 2D model for colloids with competitive interactions

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