The name is absent



(CMS) density functional theory [144]. Figure 5.4a shows the equilibrium density
profiles of these diblock copolymers. For smaller N, the profiles are approximately
sinusoidal and for larger N, they become almost step-like.


(b)

4    6    8    10    12    14    16


z∕σ                                                   L∕σ

Figure 5.4: (a) Equilibrium segment density profiles of the A block of the copolymer for N
= 5 (solid black curve,
Db = 7.2σ), 6 (dashed black curve, Z⅛ = 8.4σ), 7 (dot-dashed black
curve, D⅛ = 9.1σ), 8 (solid gray curve, B⅛ = 10.2σ), 9 (dashed gray curve,
Db = 11.0σ), and
10 (dot-dashed gray curve,
Db = 11.6σ), and (b) grand free energy of the copolymer per
unit volume as a function of the width of the computational domain for N = 5 (solid gray
curve), 6 (dashed gray curve), 7 (dot-dashed gray curve), 8 (solid black curve), 9 (dashed
black curve), and 10(dot-dashed black curve).
e∕kT = 0.289 for all the cases.

5.3.2 Confined diblock copolymer ultra-thin films

The lamellar structure of the (symmetric AB diblock) copolymer is significantly
affected when they are confined between two planar surfaces separated by H, where
H is of the order of the bulk equilibrium lamellar period of the copolymer. The

128



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