Surface-field-induced effects on morphologies of lamella-forming diblock copolymers in nanorod arrays

王向红,; 李士本,; 章林溪,; 梁好均,

doi:10.1088/1674-1056/20/8/083601

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…The phase behavior of block copolymer melts has been the focus of a substantial amount of theoretical and experimental investigations due to the interesting applications in nanotechnology and biological areas. [1][2][3][4][5][6][7] Applying external fields is a promising method to obtain a desired nanostructure. Such fields can be surface fields, [8][9][10][11][12][13][14] electric fields, [15][16][17][18][19][20] and shear flows.…”

Section: Introductionmentioning

confidence: 99%

Copolymer—homopolymer mixtures in a nanopore

Zhang¹,

Sun²,

Pan³

et al. 2013

Chinese Phys. B

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We have performed the cell dynamics simulation with the time-dependent Ginzburg—Landau theory to study the self-assembled morphology of A—B diblock copolymers and C homopolymers in a neutral nanopore. The nanopore diameter and length are systematically varied to examine their effects on the structures of various morphologies and their phase transition. From the simulation, it is observed that the equilibrium morphology of the confined system is sensitive to pore diameter D and pore length Lpore, the phase behavior in neutral nanopores is due to an interplay of two factors: the surface effect and the extension effect. When the nanopore length and the lamellae spacing are not commensurate, the surface effect prevails at small nanopores (small diameters or short lengths), the extension effect takes over at larger nanopores (large diameters or long lengths). When the nanopore length and the lamellae spacing are commensurate, the surface effect dominates. Furthermore, the interactions between different monomers are also discussed and we obtain a transition from a tilted pancakes/cylinder structure (Ltilted⊥) to a concentric cylindrical structure with defects and to a concentric cylindrical structure (L‖). We also investigate the effect of the relative concentrations of diblock copolymer—homopolymer and obtain a transition in which the position of the C blocks changes from the outer of the cylinder to the middle of the cylinder and then to the inner of the cylinder with the concentration of the C blocks decreasing.

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Section: Introductionmentioning

confidence: 99%

Copolymer—homopolymer mixtures in a nanopore

Zhang¹,

Sun²,

Pan³

et al. 2013

Chinese Phys. B

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“…[3] Subsequently, a series of relevant studies have been conducted using different methods. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Liang et al investigated mixtures of symmetric diblock copolymers/rigid nanorods, [4] cylindrical diblock copolymers/rigid nanorods [5] and mixtures of diblock copolymers and mono-or bidisperse nanorods [6] via dissipative par-ticle dynamics (DPD) simulation. This method has also been used to investigate the structure and dynamics of the selfassembly of bundles formed by nanorods of different flexibilities in the gyroid phase of the diblock copolymer matrix, [7] as well as to study the mechanism by which the nanorod surface properties regulate the compatibilization behavior and morphology transition in demixing polymer blends.…”

Section: Introductionmentioning

confidence: 99%

Phase transition of asymmetric diblock copolymer induced by nanorods of different properties*

Guo

2021

Chinese Phys. B

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We investigate the microphase transition of asymmetric diblock copolymer induced by nanorods of different properties using cell dynamics simulation and Brown dynamics. The results show the phase diagram and representative nanostructures of the diblock copolymer nanocomposite. Various structures such as sea-island structure (SI), sea-island and lamellar structure (SI-L), and lamellar structure (L) are observed in the phase diagram. The system undergoes phase transition from SI-L to SI or from L to SI with increasing length of A-like sites for all numbers of nanorods except 10 and 300, and from SI to L with increasing number of nanorods for all lengths of A-like sites. Notably, the polymer system transforms from a tilted layered structure to a parallel lamellar, perpendicular lamellar, and subsequently sea-island structure with increasing length of A-like sites for a rod number of 240. To gain more detailed insight into these structural formation mechanisms, we analyze the evolution kinetics of the system with various lengths of A-like sites of the rods. The pattern evolution and domain growth of the ordered parallel/perpendicular lamellar structure are also investigated. Furthermore, the effects of the wetting strength, rod-rod interaction, polymerization degree, and length of nanorods on the self-assembled structure of asymmetric diblock copolymer/nanorods are studied. Our simulations provide theoretical guidance on the construction of complex-assembled structures and the design of novel functional materials.

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“…Such geometries could result from nano-rod arrays of different shapes (e.g. cylindrical [76][77][78][79][80], rectangular [81], etc.). The aforementioned cases were examined with the SCFT approach [76][77][78]80,81] or using an annealing MC simulation approach [79].…”

Section: Introductionmentioning

confidence: 99%

Morphology of diblock copolymers in porous media

et al. 2014

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We study the self-assembly of a diblock copolymer melt confined within a porous medium with a prescribed regular twodimensional geometry using self-consistent field theory. We find that the morphology of the polymer sensitively depends on the characteristic length scales of the porous material and the polymer radius of gyration (R g ). When the pore size is much larger than R g , the polymer self-assembly is affected only locally close to the contact with the pore surface. However, when the size of the pores and the distance between them is comparable to the diblock characteristic length, novel morphologies appear and the polymer structure changes according to the constraints imposed by the porous material. We develop an interaction potential for the solid particle and copolymer, and show how this provides an understanding of the qualitative feature of the morphologies.

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Surface-field-induced effects on morphologies of lamella-forming diblock copolymers in nanorod arrays

Abstract: Wang Xiang-Hong( ) a)b) † , Li Shi-Ben( ) b) , Zhang Lin-Xi( ) b) , and Liang Hao-Jun( ) c)

Cited by 10 publications

References 61 publications

Copolymer—homopolymer mixtures in a nanopore

Copolymer—homopolymer mixtures in a nanopore

Phase transition of asymmetric diblock copolymer induced by nanorods of different properties*

Morphology of diblock copolymers in porous media

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