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- W4376878221 abstract "We employ Onsager's second virial density functional theory combined with the Parsons-Lee theory within the restricted orientation (Zwanzig) approximation to examine the phase structure of hard square boards of dimensions (L×D×D) uniaxially confined in narrow slabs. Depending on the wall-to-wall separation (H), we predict a number of distinctly different capillary nematic phases, including a monolayer uniaxial or biaxial planar nematic, homeotropic with a variable number of layers, and a T-type structure. We determine that the favored phase is homotropic, and we observe first-order transitions from the homeotropic structure with n layers to n+1 layers as well as from homeotropic surface anchoring to a monolayer planar or T-type structure involving both planar and homeotropic anchoring at the pore surface. By increasing the packing fraction, we further demonstrate a reentrant homeotropic-planar-homeotropic phase sequence in a particular range (i.e., H/D=1.1 and 0.25≤L/D<0.26). We find that the T-type structure is more stable when the pore is wide enough with respect to the planar phase. The enhanced stability of the mixed-anchoring T-structure is unique for square boards and becomes manifest at pore width exceeding L+D. More specifically, the biaxial T-type structure emerges directly from the homeotropic state without intervention of a planar layer structure as observed for other convex particle shapes." @default.
- W4376878221 created "2023-05-18" @default.
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- W4376878221 date "2023-05-17" @default.
- W4376878221 modified "2023-09-30" @default.
- W4376878221 title "Evidence of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:math> -type structures of hard square boards in capillary confinement" @default.
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- W4376878221 doi "https://doi.org/10.1103/physreve.107.054117" @default.
- W4376878221 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37329060" @default.
- W4376878221 hasPublicationYear "2023" @default.
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