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PRECISE CONSTRUCTION AND ASSEMBLING OF MESOATOMS BY GIANT MOLECULAR CLUSTERS

Liu, Yuchu
http://rave.ohiolink.edu/etdc/view?acc_num=akron1603766077049693

Abstract Details

2020, Doctor of Philosophy, University of Akron, Polymer Science.
The concept of hierarchical structures of materials refers to a universal phenomenon that all materials are constructed by leveled structures, where the final structure is constructed by the assembling of sub-structure elements, and these sub-structure elements are assembled from a lower level structure unit. As the properties of materials are determined by its structures, it has been the ultimate pursuit for material scientist to control the assembling of structural units of different levels. While the modern manufacturing has already developed a mature methodology to fabricate structures on the micro scale (~10-6 m), the precise structures fabrication on the nano-scale (~10-9 m) remains a challenge, and such challenge is of great interest. In this dissertation, we try to answer such challenge by taking advantage of giant molecular clusters and its blends. More specifically, we developed a method to control the formation of secondary supramolecular motifs (mesoatoms), hence further achieve the precise constructions of various spherical packing nano-structures. We design various giant molecular clusters and giant discotic molecules, all these giant molecules are composed by an aromatic inner part and aliphatic OPOSS corona, this unique molecular design will further lead to the assembling of precise mesoatoms. Our study for the assembling of these giant molecules starts with the single component system, by a systematic study of five series giant clusters, we explore the basic rules for mesoatoms formation and superlattice formation; We further explore that these rules can also be applied for giant molecular blends, which directly leads to a special self-sorting assembling behavior. More importantly, such behavior can serve as a bridge to connect the traditional inorganic alloy metallurgy and soft matter assembling; Besides the thermal dynamically stable nano-superlattice, giant molecular blends can also assemble into metastable decagonal quasicrystal superlattice, which are seldom observed in soft matters; The giant molecular clusters also possess a special dynamics. Though the giant molecular clusters are not entangled with each other, they demonstrate a glass transition similar with long chain polymers, we ascribe this special glass behavior by the cooperative motions of giant clusters. Our work expands the horizon of giant molecular assembling, it sets a stepping stone for the more systematic studies of giant molecular physics.
Stephen Z.D. Cheng (Advisor)
Tianbo Liu (Committee Chair)
Yu Zhu (Committee Member)
Toshikazu Miyoshi (Committee Member)
Chrys Wesdemiotis (Committee Member)
205 p.
Chemistry; Materials Science; Polymer Chemistry

Recommended Citations

Citations

  • Liu, Y. (2020). PRECISE CONSTRUCTION AND ASSEMBLING OF MESOATOMS BY GIANT MOLECULAR CLUSTERS [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1603766077049693

    APA Style (7th edition)

  • Liu, Yuchu. PRECISE CONSTRUCTION AND ASSEMBLING OF MESOATOMS BY GIANT MOLECULAR CLUSTERS. 2020. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1603766077049693.

    MLA Style (8th edition)

  • Liu, Yuchu. "PRECISE CONSTRUCTION AND ASSEMBLING OF MESOATOMS BY GIANT MOLECULAR CLUSTERS." Doctoral dissertation, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1603766077049693

    Chicago Manual of Style (17th edition)

akron1603766077049693
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This open access ETD is published by University of Akron and OhioLINK.