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Amphiphilic nanosheet self-assembly at the water/oil interface: computer simulations. | LitMetric

Amphiphilic nanosheet self-assembly at the water/oil interface: computer simulations.

Phys Chem Chem Phys

Department of Mechanical and Electrical Engineering, Dazhou Vocational and Technical College, Dazhou, Sichuan 635000, P. R. China.

Published: March 2017

AI Article Synopsis

Article Abstract

In this paper, dissipative particle dynamics simulations are performed to study the interfacial and emulsion stabilizing properties of various systems of amphiphilic nanosheets (ANs) self-assembled at the oil/water (O/W) interface. The ANs have a dimensional symmetry structure that encompasses a triangular-plate at the center and two soft comb-like shells constructed with hydrophilic and hydrophobic polymers. As the simulation results show, the AN molecules are highly oriented in interfacial films with their triangular nanosheets parallel to the O/W interface, while their hydrophobic and hydrophilic segments attempt to immerse into the oil phase and aqueous phase, respectively. These results reveal that the rotation of ANs at oil/water interfaces is greatly restricted, meanwhile, their nanosheet (or planar) configuration facilitates their favorable orientation thereby, thus making the emulsion more stable. At higher concentrations, a wrapped-like or micelle morphology is observed. The O/W emulsions stabilized by ANs were also simulated, and it is interesting to find AN 'patches' at the O/W interface which resembles the leather patches on a football. By introducing the "amphiphilic nanosheet balance" concept, the hydrophilic-lipophilic balance (HLB) values of ANs were calculated. Due to their properties of two-dimensional symmetry, the HLB values of ANs tend to approximately 1 which reveals a stronger stability for emulsions.

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Source
http://dx.doi.org/10.1039/c6cp08654cDOI Listing

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