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Stimuli Responsive Self-Assembly of Functional Organic Nanomaterials

Lee, Kwang Soo
http://rave.ohiolink.edu/etdc/view?acc_num=osu1452106891

Abstract Details

2016, Doctor of Philosophy, Ohio State University, Chemistry.
Self-Assembly in nature has demonstrated how functionalized supramolecular architecture from mesoscopic to nanoscale dimension can express its functional characteristics found in enzyme, cell membrane and photosynthetic system via non-covalent interactions. This process provides a convenient, albeit often empirical strategy, to fabricate materials in the nanoscale regime where these properties are present. Non-covalent interactions between multiple components within the assembled system affect its chemical and physical properties, which attributes to modulation of size, shape, and internal/external surface of the assembled structures. While it is often difficult to completely mimic the complex and dynamic biological systems, such as microtubules and actin filament, which are constantly dependent on ATP for energy to sustain their structure, building controllable supramolecular nanoassemblies can serve as a preliminary step towards dynamic, stimuli responsive system. This system can reversibly undergoes structural reorganization into different state of thermodynamically stable nanostructures in respond to changes in chemical and physical environment triggered by external stimuli such as light, sound, chemical and electric field. These responsive features in the supramolecular assemblies can be exploited towards development of intelligent materials in optoelectronics , catalysis, drug delivery and tissue-engineering. In this study, our group explores various strategies to build controllable self-assembly system: 1) Functionalized amino acids via chemical modification for molecular building block. In this study, we employed a bottom-up approach previously developed by our group to synthesize peptide based building blocks appended with functionalize chromophore to assemble via non covalent interactions such as p-p interaction, electrostatic, hydrophobic and intermolecular hydrogen-bonding interactions. While these interactions are relatively weak (Table 1), cumulative strength of these interactions increases robustness of the nanostructure without compromising its functional characteristics. 2) Active modulation of functional characteristic by external stimuli. We capitalize on the semi-conducting properties of the p-conjugated system of nanoassemblies, to develop electronics materials for organic field effect transistor (OFET) and Organic solar cell (OSC) applications. It has been shown that tight molecular packing and strong intermolecular interactions of p-conjugated molecules on a substrate results in a maximum charge-carrier mobility in the direction of p-stacking. To maximize the p-conjugated stacking of chromophore, we`ve developed a metal complex appended amphiphile to form intermolecular coordination with connective ligand to maximize p – p stacking of chromophore. Chemical modification of the amphiphiles by incorporating photochromic chromophore in building block enables photo triggered morphological transformation of nano-assemblies for controlled release applications. The presence of Cu2+ ion binding moiety in the building block allows structural transformation supramolecular assemblies and color change monitored by surface analysis and microscopic technique can be used in the development of colorimetric sensing device and pigment translocation materials
Jonathon Parquette (Advisor)
Jovica Badjic (Committee Member)
Psaras Mcgrier (Committee Member)
Linda Parsons (Committee Member)
270 p.
Chemistry
Self-assembly, nanotechnology, porphyrin, naphthalene dimide, bisindole, diarylethene, stimuli responsive

Recommended Citations

Citations

  • Lee, K. S. (2016). Stimuli Responsive Self-Assembly of Functional Organic Nanomaterials [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452106891

    APA Style (7th edition)

  • Lee, Kwang Soo. Stimuli Responsive Self-Assembly of Functional Organic Nanomaterials. 2016. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1452106891.

    MLA Style (8th edition)

  • Lee, Kwang Soo. "Stimuli Responsive Self-Assembly of Functional Organic Nanomaterials." Doctoral dissertation, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452106891

    Chicago Manual of Style (17th edition)

osu1452106891
1,119
© 2016, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.
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