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You searched for +publisher:"Clemson University" +contributor:("Dr. Rhett C. Smith, Committee Chair"). Showing records 1 – 2 of 2 total matches.

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Clemson University

1. Conrad, Catherine Alexis. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.

Degree: MS, Chemistry, 2018, Clemson University

Three different series of diphosphonium polymers were synthesized in order to analyze the supramolecular assembly of these polyelectrolytes with varying polyanions. Variation of the rigidity of the spacer between the phosphonium units determined that flexibility leads to increased absorption and consistency to film growth when observed through layer-by-layer assembly with UV-vis spectroscopy and atomic force microscopy. With the flexible ethylene spacer, films formed linearly up to 800 bilayers thick. An additional series of xylene based flexible diphosphonium polymers were synthesized with increasing numbers of methylene unit spacers. Analysis of materials was conducted through thermogravimetric analysis, X-ray crystallography, and layer-by-layer analysis tracked with UV-vis spectroscopy and atomic force microscopy. Consistency of film formation was dependent on even or odd number of the methylene spacer. Odd numbered methylene spacers lead to more consistent film growth with greater polythiophene deposition. Another series of polyelectrolytes were generated with the same methylene spacers, but with octyloxy units branching from the backbone to explore the influence of increased hydrophobicity on the previous study. Similar characterization was done with the addition of dip-cast films analyzed for critical surface energy and antimicrobial activity. The thermal stability of the octyloxy series was lower than their xylene counterparts and also demonstrated less dependence on the inter-ion spacing in the film growth formation. Extensive studies on the solvent systems for casting both the layer-by-layer films as well as the dip-cast films elucidated the high dependence and tune ability of these films by solvent systems. The presence of the hydrophobic side chain lead to an increased antibacterial activity especially when interacting with the gram-positive Staphylococcus aureus. Advisors/Committee Members: Dr. Rhett C. Smith, Committee Chair, Dr. Andrew Tennyson, Dr. Julia Brumaghim.

Subjects/Keywords: Film formation; Layer-by-layer; Phosphonium; Polyelectrolytes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Conrad, C. A. (2018). Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2829

Chicago Manual of Style (16th Edition):

Conrad, Catherine Alexis. “Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.” 2018. Masters Thesis, Clemson University. Accessed September 20, 2020. https://tigerprints.clemson.edu/all_theses/2829.

MLA Handbook (7th Edition):

Conrad, Catherine Alexis. “Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly.” 2018. Web. 20 Sep 2020.

Vancouver:

Conrad CA. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2020 Sep 20]. Available from: https://tigerprints.clemson.edu/all_theses/2829.

Council of Science Editors:

Conrad CA. Synthesis and Characterization of Novel Diphosphonium Polymers with the Emphasis on Supramolecular Assembly. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/2829


Clemson University

2. Buelt, Ashley A. Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications.

Degree: PhD, Chemistry, 2014, Clemson University

Conjugated polymers are of particular interest for many device applications, especially those involving optoelectronics. Not only is there a potential for π-conjugated organic materials to replace inorganic materials in applications such as solar cells and light emitting diodes, but there is also the possibility for these materials to serve as key components of cheaper, more environmentally-friendly, lighter and more flexible materials. For over thirty years, researchers have been striving to understand the morphology, electrochemical and photophysical properties of this new class of organic materials. The work presented herein advances the field through synthetic design and morphological studies. In addition, several novel materials for metal ion and nitroorganic detection have been discovered. The work delineated in Chapter 2 reveals the utility of the m-terphenyl unit to provide steric control of intra- and interchain interactions. A charge transfer band and a FRET effect were observed from materials prepared via simple post-polymerization modification. In Chapter 3, the detection of nitro-organics using several new polymers is discussed, with an extensive comparison to the literature. Steric, electronic, media polarity, and aggregation effects proved influential in the polymer-analyte interaction. In Chapter 4 work is outlined wherein the morphology of polymers in solution and the solid state is further examined. The study revealed a correlation between aggregation in solution and eventual nanomorphology of films derived from the solutions. Chapter 5 expands upon the work in Chapter 2 with an exploration of six new polymers that were generated via post-polymerization of two parent polymers via Sonogashira coupling. The new polymers were examined for use in metal ion and nitroorganic fluorescence response. The metal ion studies revealed the polymers to be tunable based on the donor or acceptor character of the spacer unit. From the detection of 2,4-dinitrotoluene, one polymer was found to have a comparable ultimate quenching efficiency to those discussed in Chapter 3. Advisors/Committee Members: Dr. Rhett C. Smith, Committee Chair, Dr. Karl Dieter, Dr. Jason McNeill, Dr. Stephen Foulger.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Buelt, A. A. (2014). Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1794

Chicago Manual of Style (16th Edition):

Buelt, Ashley A. “Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications.” 2014. Doctoral Dissertation, Clemson University. Accessed September 20, 2020. https://tigerprints.clemson.edu/all_dissertations/1794.

MLA Handbook (7th Edition):

Buelt, Ashley A. “Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications.” 2014. Web. 20 Sep 2020.

Vancouver:

Buelt AA. Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications. [Internet] [Doctoral dissertation]. Clemson University; 2014. [cited 2020 Sep 20]. Available from: https://tigerprints.clemson.edu/all_dissertations/1794.

Council of Science Editors:

Buelt AA. Optically Active and Stimuli-Responsive Macromolecules: Photophysics, Morphology and Sensor Applications. [Doctoral Dissertation]. Clemson University; 2014. Available from: https://tigerprints.clemson.edu/all_dissertations/1794

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