Browsing by Author "University of Minnesota Department of Chemical Engineering and Materials Science"
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Item 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 ScienceThis 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.Item Supporting Data for Luminescent Solar Concentrator Greenhouses for Concurrent Energy Generation and Lettuce Production in the United States(2024-05-23) Loh, Kristine; Harbick, Kale; Eylands, Nathan; Kortshagen, Uwe; Ferry, Vivian; veferry@umn.edu; Ferry, Vivian; University of Minnesota Department of Chemical Engineering and Materials ScienceMeeting the needs for both renewable energy production and increased food supply to sustain growing communities remains a global challenge. Agrivoltaic greenhouses can meet these dual needs in one plot of land, mitigating land competition. Luminescent solar concentrators (LSCs) benefit these systems by providing additional design flexibility for crop-specific spec-trum modification while allowing sufficient light transmission for crop growth. Silicon quantum dots (Si QDs) have received growing interest as a material candidate for LSC greenhouses as well. We present an investigation into the impact of Si QD film concentration on the energy demands of an LSC greenhouse in Phoenix, Arizona through a comprehensive modelling framework. We then expand upon one Si QD concentration and simulate LSC greenhouses in 48 locations across the United States. We demonstrate LSC greenhouses can supply their annual energy demands in warm climates, where greenhouse heating demands remain low. LSC greenhouses can also be as profitable as the conventional glass greenhouse if the crop yield remains comparable or if the greenhouse can benefit from net metering.Item Supporting Information for Mechanism of Methanol Dehydration Catalyzed by Al8O12 Nodes assisted by Linker Amine Groups of the Metal-Organic Framework CAU-1(2022-06-13) Yang, Dong; Chheda, Saumil; Lyu, Yinghui; Li, Ziang; Xiao, Yu; Siepmann, J Ilja; Gagliardi, Laura; Gates, Bruce C; lgagliardi@uchicago.edu; Gaglairdi, Laura; University of Chicago Department of Chemistry; University of Chicago Pritzker School of Molecular Engineering; University of Chicago Chicago Center for Theoretical Chemistry; University of Minnesota Department of Chemical Engineering and Materials Science; University of Minnesota Department of Chemistry; University of Minnesota Chemical Theory CenterThis repository contains the XYZ files of the structures optimized using density functional theory for the investigation of methanol dehydration mechanism catalyzed by metal-organic framework CAU-1.