2014
DOI: 10.1021/la501182t
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Drop-Casting Hydrogels at a Liquid Interface: The Case of Hydrophobic Dipeptides

Abstract: Hydrophobic dipeptide molecules have been induced to self-assemble into thin interfacial films at the air-water interface via drop-casting. The mechanism involves fiberlike strands, which exist in the high-pH spreading solvent, becoming intertwined at the surface of a low-pH subphase. Atomic force microscopy (AFM) reveals that the strands are ∼40 nm wide and ∼20 nm high and are woven together to form layers that can be up to ∼800 nm thick. The use of Thioflavin T (ThT) fluorescence suggests that the dipeptides… Show more

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Cited by 25 publications
(34 citation statements)
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“…Dynamic compression is a popular practical method to determine the mechanical response of different materials, from hydrogels [13] to the bacterial cell wall [14]. In 2D monolayers, this method allows simultaneous monitoring of the microscopic structure of the system and of the macroscopic surface pressure.…”
Section: Supa School Of Physics and Astronomy University Of Edinburmentioning
confidence: 99%
“…Dynamic compression is a popular practical method to determine the mechanical response of different materials, from hydrogels [13] to the bacterial cell wall [14]. In 2D monolayers, this method allows simultaneous monitoring of the microscopic structure of the system and of the macroscopic surface pressure.…”
Section: Supa School Of Physics and Astronomy University Of Edinburmentioning
confidence: 99%
“…Averaged over more than 50 fibers, we find that the width of a single fiber is approximately 190 ± 50 nm. This is markedly thicker than the strands in the interfacial films we created at the air–water interface and is also thicker than strands in bulk hydrogels . In the continuous phase, excess dipeptides can be flocculated and form a 3D network, which keeps the bubbles well separated.…”
Section: Resultsmentioning
confidence: 80%
“…By drop‐casting a dipeptide in a high pH solvent onto a liquid subphase at low pH, the carboxylic acid becomes protonated which induces gelation at the interface . We have also demonstrated that the interfacial layer can be used to stabilize large air bubbles (millimeter‐size) for days at least . These features strongly suggest that the dipeptide hydrogel would be an excellent candidate for foam and emulsion stabilization.…”
Section: Introductionmentioning
confidence: 81%
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“…Fibrils are formed by the self-assembly of organic molecules and, when fibril formation occurs in the solution phase, gels are formed by the incorporation of large amounts of solvent molecules. [3,4] In contrast, fibril formation at the liquid-solid interface results in thin fibril films and many two-dimensional crystallizations that form as heet on the surfaceh ave been reported. [5,6] Unlike the two-dimensional fibril film, films formed by one-dimensional fibrils contain both ordered microstructures and the liquid phase, and can be used to interact and exchange substances with the solution phase.…”
Section: Introductionmentioning
confidence: 99%