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The Solution Behavior of Macroions Regulated by Host-Guest Chemistry

Liang, Zihao
http://rave.ohiolink.edu/etdc/view?acc_num=akron152225667682411

Abstract Details

2018, Master of Science, University of Akron, Polymer Science.
The solution behavior of large, charged macroions has been well studied in the past decade, which filled the knowledge gap between simple ions and colloids. When soluble ions reach the size of nanometer-scale, they generally not exist as discrete macroions in dilute solution anymore, instead, single-layered, hollow, spherical “blackberry”-like structures tend to be formed. This “blackberry”-like structure will form only when macroions carry moderate charges. Some methods to change the “blackberry” size have been reported, such as changing solvent polarity, adding extra salts, and tuning the pH of the aqueous medium. Charge density of the macroions changes in the three mentioned methods. Cationic metal-organic nanocages (MONs) are also macroions that are capable of assembling into “blackberry” structures. Furthermore, due to the cavity of the MONs, guest molecules could be encapsulated into the nanocages. The charge density of the host-guest complexes could be tuned by encapsulating charged guests into the MONs, resulting in different intermolecular interaction. The intermolecular distance will change afterwards, finally leading to different blackberry size. In this research, Laser Light Scattering (LLS) and Transmission Electron Microscope (TEM) were used to investigate the blackberry structure formation process and the effect of the charge of the guest molecules on the size of the assembly. Isothermal Titration Calorimetry, 1D solution state 1H Nuclear Magnetic Resonance (NMR) and 2D solid state 1H NMR were used to confirm the successful encapsulation of guest molecules. The host-guest interaction was confirmed to be valid in both water and acetone environment. The charge density of the host-guest complex could be controlled by encapsulating guest molecules with different types of charge. The blackberry assembly size could be controlled by means of host-guest chemistry.
Tianbo Liu, Dr. (Advisor)
Toshikazu Miyoshi, Dr. (Committee Member)
36 p.
Chemistry; Physical Chemistry; Polymers

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Citations

  • Liang, Z. (2018). The Solution Behavior of Macroions Regulated by Host-Guest Chemistry [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron152225667682411

    APA Style (7th edition)

  • Liang, Zihao. The Solution Behavior of Macroions Regulated by Host-Guest Chemistry. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron152225667682411.

    MLA Style (8th edition)

  • Liang, Zihao. "The Solution Behavior of Macroions Regulated by Host-Guest Chemistry." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152225667682411

    Chicago Manual of Style (17th edition)

akron152225667682411
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© 2018, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.