Browsing by Subject "double gyroid"

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    Data for Equilibrium Phase Behavior of Gyroid-Forming Diblock Polymer Thin Films
    (2024-08-08) Magruder, Benjamin; Ellison, Christopher; Dorfman, Kevin; dorfman@umn.edu; Dorfman, Kevin; Dorfman Research Group
    The dataset contains the results of thin-film self-consistent field theory calculations for the double-gyroid phase and other related phases in AB diblock polymers. All results used to construct the figures in the referenced manuscript are included in this dataset, along with many of the scripts used to perform the analysis in the manuscript. To reduce the size of the dataset, we opted to include only the first and last field file in each parameter sweep, though we kept the corresponding summary file at every state point in every sweep, and included all necessary input files to regenerate the data if desired. The PSCF software package (C++ version) was used to generate this dataset (https://github.com/dmorse/pscfpp).
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    Data for Surface Relief Terraces in Double Gyroid-Forming Polystyrene-block-Polylactide Thin Films
    (2023-09-28) Yang, Szu-Ming; Oh, Jinwoo; Magruder, Benjamin R; Kim, HeeJoong; Dorfman, Kevin D; Mahanthappa, Mahesh K; Ellison, Christopher J; cellison@umn.edu; Ellison, Christopher J; University of Minnesota Department of Chemical Engineering and Materials Science
    This study describes the thin film self-assembly behavior of a polystyrene-block-polylactide (SL-G) diblock copolymer, which undergoes melt self-assembly in bulk into a double gyroid (DG) network phase with a cubic unit cell parameter a = 52.7 nm. Scanning electron microscopy (SEM) and grazing-incidence small-angle X-ray scattering (GISAXS) reveal that thermally annealing 140–198 nm thick copolymer films on SiO2 substrates below the morphological order-to-disorder transition temperature yields polydomain DG structures, in which the (422) planes are oriented parallel to the surface. Bright-field optical microscopy (OM) and atomic force microscopy (AFM) analyses further reveal the film thickness-dependent formation of topographical terraces, including islands, holes, and bicontinuous features. The occurrence of these features sensitively depends on the incommensurability of the as-prepared film thickness and the (211)-interplanar spacing (d211) of the DG unit cell. While the steps heights between adjacent terraces exhibiting characteristic “double wave” patterns of the DG (422) planes coincide with d211, previously unreported transition zones between adjacent terraces are observed wherein “boomerang” and “droplet” patterns are observed. These intermediate patterns follow the expected sequence of adjacent termination planes of the bulk DG unit cell along the [211] direction, as confirmed by comparisons with self-consistent mean-field theory calculations.