Abstract
Dipeptide-based two-headed amphiphiles ([(Val) l (Val) l ] 2C 10) in aqueous media transform from rod-like micelles to fibrous structures via vesicle-like intermediates on exposure to acid vapor. A similar phase behavior is present when the molecule is dissolved in DMSO followed by the addition of water (a poor solvent). On the basis of SLS, FT-IR, and FE-SEM measurements, spherical colloids are formed at a small DMSO content (20%) and fibrous structures are formed at a moderate DMSO content (40–60%). This phase behavior is influenced by the chirality of the amphiphiles. A mixed system composed of [(Val) l (Val) l ] 2C 10 and [(Val) d (Val) d ] 2C 10, and a system of [(Val) l (Val) d ] 2C 10 immediately form crystals without formation of spherical colloids or fibrous structures. By optimizing the mixing ratio of the solvents and concentration of the solute, stable micrometer-sized hollow spheres composed of [(Val) l (Val) l ] 2C 10 stabilized by non-covalent bonds are easily prepared.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.