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| Author(s): |
Bruno Giordano Alvarenga
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Química |
| Defense date: | 2017-10-10 |
| Examining board members: |
Edvaldo Sabadini;
Denise Freitas Siqueira Petri;
Maria Isabel Felisberti;
Raphael Nagao de Sousa;
Vanderlei Gageiro Machado
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| Advisor: | Edvaldo Sabadini |
| Abstract | |
Progress in the field of supramolecular chemistry are related in the design and synthesis of new molecules that self-assemble into supramolecular structures (polymers) through non-covalent interactions between the its constituent parts, and the better understanding about the experimental conditions in which the microscopic and macroscopic properties of these systems can be adjusted. Small organic molecules with an aromatic core and groups able to form intense hydrogen bonds, such as bis-urea derivatives and benzene-1,3,5-tricarboxamides (BTAs), are particularly interesting because of their simple structures and high ability to self-assemble into long and stable supramolecular polymers in low polarity solvents and to yield viscoelastic gels. In this context, this thesis focuses on the discussion of two aspects involving supramolecular polymers that contribute to the future development of new systems and applications: (i) the unexpected effect of small changes in solvent nature on self-assembly of bis-ureas, in which more polar solvents provide more viscous solutions; (ii) the effect of the addition of secondary intermolecular interactions through functional groups of amino ester groups or peptide segments bound to the molecular structure of BTAs to alter the self-assembly processes of these systems in solution. These aspects and other effects such as temperature and concentration as well as transitions occurring in these systems were rigorously studied through the use of different spectroscopic techniques, calorimetry, light and neutron scattering and rheology that combine the observations of macroscopic and microscopic properties (AU) | |
| FAPESP's process: | 14/04515-8 - Supramolecular polymers of bis-ureia in solution: balance of solute-solvent interaction |
| Grantee: | Bruno Giordano Alvarenga |
| Support Opportunities: | Scholarships in Brazil - Doctorate |