Bachl, Juergen and Sampedro, Diego and Mayr, Judith and Diaz Diaz, David (2017) Ultrasonication-enhanced gelation properties of a versatile amphiphilic formamidine-based gelator exhibiting both organogelation and hydrogelation abilities. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19 (34). pp. 22981-22994. ISSN 1463-9076, 1463-9084
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We describe the preparation of a novel amphiphilic gelator built from a formamidine core, which is able to form a variety of physical organogels and hydrogels at concentrations ranging from 15 to 150 mg mL(-1). Interestingly, ultrasound treatment of isotropic solutions (i.e., gel-precursor) resulted in a remarkable enhancement of the gelation kinetics as well as the gelation scope and characteristic gel properties (e.g., critical gelation concentration, gel-to-sol transition temperature, viscoelastic moduli) in comparison to the heating-cooling protocol typically used to obtain supramolecular gels. Thermoreversibility, thixotropy, injectability and multistimuli responsiveness are some of the most relevant functionalities of these gels. Electron microscopy imaging revealed the formation of entangled networks made of fibers of nanometer diameters and micrometer lengths, with different morphological features depending on the solvent. Insights into the driving forces for molecular aggregations were obtained from FTIR, NMR, PXRD and computational studies. The results suggest a major stabilization of the fibers through additive N-H center dot center dot center dot O hydrogen bonds, in combination with hydrophobic interactions, over pi-pi stacking interactions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MASS ORGANIC GELATORS; GEL; DERIVATIVES; ULTRASOUND; STIMULI; NANOMATERIALS; DISPERSION; SONICATION; POLYMERS; KINETICS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. David Díaz Díaz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:15 |
| Last Modified: | 26 Feb 2019 08:32 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1184 |
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