Orientational ordering and spatial distribution of Janus nanoparticles in lamellae diblock copolymers

Osipov, Mikhail A.; Ushakova, A. S.

doi:10.1016/j.molliq.2018.01.048

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…The alignment of elongated NPs within lamellar-forming BCP has been shown experimentally [15,16,25] and in simulations. [26,34,60,61] Nonetheless, the NP nematic ordering in Figures 1b and Figure by the BCP orientation, as the BCP morphology and the NP shape are both uniaxial.…”

Section: Alignment and Morphology Of Bcp/anisotropic Npsmentioning

confidence: 90%

Nematic Ordering of Anisotropic Nanoparticles in Block Copolymers

Diaz

Pinna

Zvelindovsky

et al. 2021

Advcd Theory and Sims

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Block copolymer melts have been previously used to control the position and alignment of anisotropic nanoparticles. In this work, 2D and 3D mesoscopic simulations are used to explore the phase behavior of block copolymer/nanoparticle systems. The method combines a time-dependent Ginzburg-Landau for the polymer and Brownian dynamics for the anisotropic nanoparticles. Rhomboidal and spheroidal shaped particles are simulated in two and three dimensions, respectively. It is found that the nanoparticle nematic order aligned by the block copolymer domains enhances the lamellar phase of the block copolymer, due to an anisotropy-driven phase transition. Additionally, anisotropic nanoparticles within circular-forming block copolymer leads to a competition between the nematic colloidal ordering and the hexagonally ordered mesophase. At large concentrations, the nematic order dominates, deforming the block copolymer mesophase.

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Section: Alignment and Morphology Of Bcp/anisotropic Npsmentioning

confidence: 90%

Nematic Ordering of Anisotropic Nanoparticles in Block Copolymers

Diaz

Pinna

Zvelindovsky

et al. 2021

Advcd Theory and Sims

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“…Most of the research work on these systems has been limited to BCPs incorporating spherical NPs or, to a much lesser extent, rod-like [ 46 , 50 ] and disk-like [ 32 , 51 ] anisotropic NPs. Nevertheless, studies on non-spherical NPs that exhibit two chemically distinct compartments and are therefore anisotropic in both shape and interactions are still at a stage where theory and simulation are paving the path for experiments [ 26 , 44 , 52 , 53 , 54 ]. Such a double anisotropy provides additional degrees of freedom to more precisely control the interplay between enthalpy and entropy by tuning NP size, shape and surface chemistry, in relation to the architecture of the BCP employed and its potential ability of self-assembling into periodically ordered mesophases.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics of Janus Nanodimers Dispersed in Lamellar Phases of a Block Copolymer

Burgos-Mármol

Patti

2021

Polymers

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We investigate structural and dynamical properties of Janus nanodimers (NDs) dispersed in lamellar phases of a diblock copolymer. By performing molecular dynamics simulations, we show that an accurate tuning of the interactions between NDs and copolymer blocks can lead to a close control of NDs’ space distribution and orientation. In particular, NDs are preferentially found within the lamellae if enthalpy-driven forces offset their entropic counterpart. By contrast, when enthalpy-driven forces are not significant, the distribution of NDs, preferentially observed within the inter-lamellar spacing, is mostly driven by excluded-volume effects. Not only does the degree of affinity between host and guest species drive the NDs’ distribution in the polymer matrix, but it also determines their space orientation. In turn, these key structural properties influence the long-time dynamics and the ability of NDs to diffuse through the polymer matrix.

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“…In that case, two spheres of different size and chemical affinity are considered 29 . The ordering and positioning of JNP in a lamellarforming BCP have been investigated 30 considering symmetric and asymmetric JNP made of two spheres.…”

Section: Introductionmentioning

confidence: 99%

Co-assembly of Janus nanoparticles in block copolymer systems

et al. 2019

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Block copolymer are ideal matrices to control the localisation of colloids. Furthermore, anisotropic nanoparticles such as Janus nanoparticles possess an additional orientational degree of freedom that can play a crucial role in the formation of highly ordered materials made of block copolymers. This work presents a mesoscopic simulation method to assert the co-assembly of Janus nanoparticles in a block copolymer mixture, finding numerous instances of aggregation and formation of ordered configurations which can be related to dispersions of pure Janus colloids. Comparison with chemically homogeneous neutral nanoparticles determines that Janus nanoparticles are less prone to induce bridging along lamellar domains, thus being a less destructive way to segregate nanoparticles at interfaces. The combination of asymmetric block copolymer and asymmetric Janus nanoparticles can result in assembly of colloids in an even number of layers within one of the block domains.

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Orientational ordering and spatial distribution of Janus nanoparticles in lamellae diblock copolymers

Cited by 5 publications

References 36 publications

Nematic Ordering of Anisotropic Nanoparticles in Block Copolymers

Nematic Ordering of Anisotropic Nanoparticles in Block Copolymers

Molecular Dynamics of Janus Nanodimers Dispersed in Lamellar Phases of a Block Copolymer

Co-assembly of Janus nanoparticles in block copolymer systems

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