Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Implications of Grain Size Variation in Magnetic Field Alignment of
  Block Copolymer Blends   Recent experiments have highlighted the intrinsic magnetic anisotropy in
coil-coil diblock copolymers, specifically in poly(styrene-b-4-vinylpyridine)
(PS-b-P4VP), that enables magnetic field alignment at field strengths of a few
tesla. We consider here the alignment response of two low molecular weight (MW)
lamallae-forming PS-b-P4VP systems. Cooling across the disorder-order
transition temperature ($\mathrm{T_{odt}}$) results in strong alignment for the
higher MW sample (5.5K), whereas little alignment is discernible for the lower
MW system (3.6K). This disparity under otherwise identical conditions of field
strength and cooling rate suggests that different average grain sizes are
produced during slow cooling of these materials, with larger grains formed in
the higher MW material. Blending the block copolymers results in homogeneous
samples which display $\mathrm{T_{odt}}$, d-spacings and grain sizes that are
intermediate between the two neat diblocks. Similarly, the alignment quality
displays a smooth variation with the concentration of the higher MW diblock in
the blends and the size of grains likewise interpolates between limits set by
the neat diblocks, with a factor of 3.5X difference in the grain size observed
in high vs low MW neat diblocks. These results highlight the importance of
grain growth kinetics in dictating the field response in block copolymers and
suggests an unconventional route for the manipulation of such kinetics.

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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom