Ripple structures of mixed homopolymer brushes grafted on cylindrical surfaces: controlling the orientation of the pattern by attuning the substrate curvatures

Ma, Xin; Chen, Cangyi; Yang, Yingzi; Qiu, Feng

doi:10.1039/c4sm00749b

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…Finally, the geometry of the surface can have a profound effect on polymer chain conformations and, hence, the favored MPB morphology. Examples include nanoparticles (NPs) [101,157], cylindrical [158], nanorod [159,160], and nanopore [160] surfaces for which a rich variety of phase separated brush structures was predicted. Compared to planar surfaces, curvature or aspect ratio as additional parameters influence MPB phase segregation.…”

Section: Theoretical Discussionmentioning

confidence: 99%

Mixed Polymer Brushes for “Smart” Surfaces

Pester

2020

Polymers

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Mixed polymer brushes (MPBs) are composed of two or more disparate polymers covalently tethered to a substrate. The resulting phase segregated morphologies have been extensively studied as responsive “smart” materials, as they can be reversible tuned and switched by external stimuli. Both computational and experimental work has attempted to establish an understanding of the resulting nanostructures that vary as a function of many factors. This contribution highlights state-of-the-art MPBs studies, covering synthetic approaches, phase behavior, responsiveness to external stimuli as well as novel applications of MPBs. Current limitations are recognized and possible directions for future studies are identified.

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Section: Theoretical Discussionmentioning

confidence: 99%

Mixed Polymer Brushes for “Smart” Surfaces

Pester

2020

Polymers

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“…Their results suggest a new method to manipulate nanoparticles with precisely controlled numbers and locations of active sites. Recently, by incorporating the “masking” technique into the SCFT, we systematically investigated the morphology of isolated binary hairy nanoparticles. − Our method to solve the SCFT equations on a spherical surface in a simple Cartesian coordinate system utilizes the efficient and highly accurate pseudospectral method . Meanwhile, Zhao and Zhu − carried out a series of experiments to study the microphase structures of mixed poly( tert -butyl acrylate) (P t BA)/polystyrene (PS) brushes grafted on a silica particle.…”

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confidence: 99%

Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles

et al. 2016

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Hierarchical superstructures assembled by binary mixed homopolymer-grafted nanoparticles are investigated by using a self-consistent field theory (SCFT). Our results demonstrate that grafting mixed homopolymer brushes provides an effective way to program the spatial lattice arrangement of the nanoparticles. For the polymer-grafted nanoparticles with specific interaction parameter and total grafting density, the unusual non-close-packed simple cubic (SC) crystal lattice is obtained at small spherical core/polymer size ratios (R/( N b) < 1). As the size ratio increases to R N b /() > 1, the nanoparticle arrangement transforms into a body-centered cubic (BCC) crystal lattice. Meanwhile, some unconventional microphases are formed in the polymer matrix, such as the tetragonal cylinder and simple cubic sphere phases. Furthermore, the two-dimensional (2D) model calculations reveal that the binary hairy nanoparticles prefer to arrange into the lattice in a way they can maintain the free energy-minimizing morphology as an isolated particle. Our findings suggest a possible strategy to design hierarchical nanomaterials composed of unique inorganic/organic hybrid superstructures.

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“…Another open question is the role of the NP shape in phase separation in mixed polymer ligands. More specifically, to the best of our knowledge, the effect of the local surface curvature of nonspherical NPs on polymer phase separation was explored only theoretically. , In particular, for nanorods (NRs) capped with mixed polymer brushes, ring- , and helix-shaped patterns were predicted in which polymers were separated into either alternating rings that were perpendicular to the long NR axis or two adjacent helices continuously wrapping the NR surface. The total free energies of the polymer-capped NRs (calculated as the sum of the interaction energy and the stretching energy of the two polymers) were almost the same for the ring- and helix-shaped patterns …”

Section: Introductionmentioning

confidence: 99%

“…The total free energies of the polymer-capped NRs (calculated as the sum of the interaction energy and the stretching energy of the two polymers) were almost the same for the ring-and helix-shaped patterns. 34 In the present work, we focused on the nanopatterning of gold nanorods (AuNRs) by the phase separation of end-grafted polystyrene (PS) and poly(ethylene glycol) (PEG) ligands in a good solvent (gold nanospheres, AuNSs, were used as a control system). By varying the PS-to-PEG molar ratio in the feed solution using AuNR functionalization, we generated different surface patterns that were visualized as a uniform PS shell, a nonuniform PS shell, multiple random PS patches, and, most interestingly, a helicoidal pattern of PS patches wrapping around the AuNRs.…”

Section: ■ Introductionmentioning

confidence: 99%

Helicoidal Patterning of Gold Nanorods by Phase Separation in Mixed Polymer Brushes

et al. 2019

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The spatial distribution of polymer ligands on the surface of nanoparticles (NPs) is of great importance because it determines their interactions with each other and with the surrounding environment. Phase separation in mixtures of polymer brushes has been studied for spherical NPs; however, the role of local surface curvature of nonspherical NPs in the surface phase separation of end-grafted polymer ligands remains an open question. Here, we examined phase separation in mixed monolayers of incompatible polystyrene and poly(ethylene glycol) brushes endcapping the surface of gold nanorods in a good solvent. By varying the molar ratio between these polymers, we generated a range of surface patterns, including uniform and nonuniform polystyrene shells, randomly distributed polystyrene surface patches, and, most interestingly, a helicoidal pattern of polystyrene patches wrapping around the nanorods. The helicoidally patterned nanorods exhibited long-term colloidal stability in a good solvent. The helicoidal wrapping of the nanorods was achieved for the mixtures of polymers with different molecular weights and preserved when the quality of the solvent for the polymers was reduced. The helicoidal organization of polymer patches on the surface of nanorods can be used for templating the synthesis or self-assembly of helicoidal multicomponent nanomaterials.

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Ripple structures of mixed homopolymer brushes grafted on cylindrical surfaces: controlling the orientation of the pattern by attuning the substrate curvatures

Cited by 8 publications

References 24 publications

Mixed Polymer Brushes for “Smart” Surfaces

Mixed Polymer Brushes for “Smart” Surfaces

Hierarchical Superstructures Assembled by Binary Hairy Nanoparticles

Helicoidal Patterning of Gold Nanorods by Phase Separation in Mixed Polymer Brushes

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