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Thesis Yunyi Gao 2017 Fall.pdf (4.91 MB)

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Solution Behaviors of Macroions Driven by Non-covalent Interactions

Gao, Yunyi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1509897811144406

Abstract Details

, Doctor of Philosophy, University of Akron, Polymer Science.
Macroions demonstrate very intriguing solution behaviors that are different from colloids and simple ions due to their intermediate sizes in between. Those macroions, when carrying moderate surface charge density, can self-assemble into a spherical, hollow, singled layered "blackberry" structures in solution, with counterion-mediated attraction to be the major driving force. Other non-covalent forces such as hydrogen bonding and solvophobic interactions are also playing a significant role in directing the solution behaviors of macroions. In this dissertation, uranyl peroxide nanoclusters are investigated to further explore and expand their unique solution properties as macroions. These U60 clusters were proved to be able to distinguish different monovalent counterions and only allow certain counterions to be trapped inside their cages. The hydration shell destruction was dominantly contributing to the entropy loss during the ion binding process. Such ion selectivity properties can be accurately tuned by changing the incubating temperature of the aqueous environment. The U24Pp12 clusters, when synthesized with different counterions, showed two isomeric structures depending on the orientation of one of the polyhedral faces. The transition from a "concave ou" to a "concave in" structure was made possible by simply titrating the monovalent counterions into the U24Pp12 solutions. The non-covalently linked surfactant encapsulated nanoclusters of U60 and different cationic surfactants, were found to be able to self-assemble into vesicle-like structures, mimicking the self-assembly of those covalently linked POM-inorganic hybrids. The self-assembly and structural transition behaviors are mainly characterized by dynamic light scattering (DLS), static light scattering (SLS) and isothermal titration calorimetry (ITC).
Tianbo Liu (Advisor)
Stephen Cheng (Committee Chair)
Toshikazu Miyoshi (Committee Member)
Mesfin Tsige (Committee Member)
Jie Zheng (Committee Member)
Chemistry; Physical Chemistry; Polymers

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Citations

  • Gao, Y. (n.d.). Solution Behaviors of Macroions Driven by Non-covalent Interactions [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509897811144406

    APA Style (7th edition)

  • Gao, Yunyi. Solution Behaviors of Macroions Driven by Non-covalent Interactions. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1509897811144406.

    MLA Style (8th edition)

  • Gao, Yunyi. "Solution Behaviors of Macroions Driven by Non-covalent Interactions." Doctoral dissertation, University of Akron. Accessed APRIL 24, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509897811144406

    Chicago Manual of Style (17th edition)

akron1509897811144406
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This open access ETD is published by University of Akron and OhioLINK.