Research ArticleCHEMICAL PHYSICS

Impact of complex topology of porous media on phase separation of binary mixtures

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Science Advances  22 Dec 2017:
Vol. 3, no. 12, eaap9570
DOI: 10.1126/sciadv.aap9570
  • Fig. 1 Wetting of a droplet on a flat wall.

    (A) The wetting behavior of a droplet on a flat wall for different wetting parameter h1. h1 = 0, −2, and −10 from left to right. (B) The cross section of a droplet and a wall along x = Lx/2 for the case of neutral wetting (h1 = 0).

  • Fig. 2 Time evolution of the concentration field for a 3D random symmetric porous structure in a neutral wetting case (h1 = 0).

    (A) Two demixed phases [the A (green) and B (blue) phases] together with the porous structure surface (black). See also movie S1. (B) Only the A phase but without the wetting layer formed on the surface of the porous structure by drawing the iso-interface of ψ = 0.6 in the pore space where ρ < 0.173. (C) Only the B phase by drawing the iso-interface of ψ = −0.6. Here, the green and blue interfaces represent the iso-concentration surface of ψ = 0.6 for the A phase and that of ψ = −0.6 for the B phase, respectively.

  • Fig. 3 Structural evolution in k-space for a binary mixture in porous structures.

    Time evolution of S(k) in a neutral wetting (h1 = 0) case (A) and the first moment of wave number k1 for various wettability (B) for a 3D symmetric porous structure. Time evolution of S(k) in a neutral wetting (h1 = 0) case (C) and the first moment of wave number k1 for various wettability (D) for a 2D symmetric porous structure. For both 2D and 3D, the characteristic wave number k1 decreases as t−1/3 in the intermediate stage for h1 = 0 but more slowly for h1 ≠ 0.

  • Fig. 4 Time evolution of the concentration field in 2D random symmetric porous material.

    (A) A neutral wetting case (h1 = 0). The black region represents the symmetric porous structure, and the red and white domains show the A and B phase, respectively. See movie S2. (B) A complete wetting case (h1 = –10). See movie S4. (C) A partial wetting case (h1 = –2).

  • Fig. 5 Time evolution of the concentration field for a 3D random symmetric porous structure in a complete wetting case (h1 = –10).

    (A) Two demixed phases [the more (green) and less wettable (blue) phases] together with the porous structure surface (black). See also movie S3. (B) Only the more wettable phase but without the wetting layer formed on the surface of the porous structure by drawing the iso-interface of ψ = 0.6 in the pore space where ρ < 0.173. (C) Only the less wettable phase by drawing the iso-interface of ψ = −0.6. Here, the green and blue interfaces represent the iso-concentration surface of ψ = 0.6 for the more wettable phase and that of ψ = −0.6 for the less wettable phase, respectively.

  • Fig. 6 Time evolution of the concentration field for a 3D random symmetric porous structure in a partial wetting case (h1 = –2).

    (A) Two demixed phases [the more (green) and less wettable (blue) phases] together with the porous structure surface (black). (B) Only the more wettable phase but without the wetting layer formed on the surface of the porous structure by drawing the iso-interface of ψ = 0.6 in the pore space where ρ < 0.173. (C) Only the less wettable phase by drawing the iso-interface of ψ = −0.6. Here, the green and blue interfaces represent the iso-concentration surface of ψ = 0.6 for the more wettable phase and that of ψ = −0.6 for the less wettable phase, respectively.

  • Fig. 7 Time evolution of the concentration field for an asymmetric bicontinuous porous structure (Φ = 0.65).

    (A) Neutral wetting (h1 = 0). (B) Partial wetting (h1 = –2). (C) Complete wetting (h1 = –10).

Supplementary Materials

  • Supplementary Materials

    Other Supplementary Material for this manuscript includes the following:

    • movie S1 (.avi format). Movie corresponding to Fig. 2A.
    • movie S2 (.avi format). Movie corresponding to Fig. 4A.
    • movie S3 (.avi format). Movie corresponding to Fig. 5.
    • movie S4 (.avi format). Movie corresponding to Fig. 4B.

    Files in this Data Supplement:

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