Magnetic alignment of block copolymer microdomains by intrinsic chain anisotropy

Rokhlenko, Yekaterina; Yager, Kevin G.; Gopinadhan, Manesh; Osuji, Chinedum O.; Zhang, Kai; O'Hern, Corey S.; Larson, Steven R.; Gopalan, Padma; Majewski, Pawel W.

doi:10.1103/PhysRevLett.115.258302

Magnetic alignment of block copolymer microdomains by intrinsic chain anisotropy

Journal Article · Fri Dec 18 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.258302· OSTI ID:1246786

Rokhlenko, Yekaterina ^[1]; Yager, Kevin G. ^[2]; Gopinadhan, Manesh ^[1]; Osuji, Chinedum O. ^[1]; Zhang, Kai ^[1]; O'Hern, Corey S. ^[1]; Larson, Steven R. ^[3]; Gopalan, Padma ^[3]; Majewski, Pawel W. ^[2]

Yale Univ., New Haven, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Wisconsin, Madison, WI (United States)

We examine the role of intrinsic chain susceptibility anisotropy in magnetic field directed self-assembly of a block copolymer using in situ x-ray scattering. Alignment of a lamellar mesophase is observed on cooling across the disorder-order transition with the resulting orientational order inversely proportional to the cooling rate. We discuss the origin of the susceptibility anisotropy, Δ_χ, that drives alignment and calculate its magnitude using coarse-grained molecular dynamics to sample conformations of surface-tethered chains, finding Δ_χ ≈ 2×10^–8. From field-dependent scattering data, we estimate that grains of ≈ 1.2 μm are present during alignment. Furthermore, these results demonstrate that intrinsic anisotropy is sufficient to support strong field-induced mesophase alignment and suggest a versatile strategy for field control of orientational order in block copolymers.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1246786

Alternate ID(s):: OSTI ID: 1233966

Report Number(s):: BNL--111841-2016-JA; KC0403020

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 115; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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