Abstract
Two surfactants, namely, dodecanoylglycinate and dodecanoylsarcosinate, differing only in a methyl group vs. a hydrogen atom on the amide nitrogen, have been studied with respect to solution behavior and adsorption at the air–water, oil-water and calcium carbonate-water interfaces. It was found that the ability of the glycinate surfactant of forming intermolecular hydrogen bonds via the amide group leads to tighter molecular packing, which greatly influenced the behavior at interfaces. Based on this molecular observation, potential applications were considered and emulsification, foaming and wetting tests were carried out. It could be concluded from this work that a minor change in the structure of a surfactant molecule can be very significant for technological systems and processes.
Kurzfassung
Dodecanoylglycinat und Dodecanoylsarcosinat unterscheiden sich nur in einer Methylgruppe im Vergleich zu einem Wasserstoffatom am Amin-Stickstoff. Diese Tenside wurden untersucht hinsichtlich ihres Lösungsverhaltens und ihrer Adsorption an den Luft-Wasser-, Öl-Wasser und Calciumcarbonat-Wasser-Grenzflächen. Es wurde festgestellt, dass das Glycinat-Tensid intermolekulare Wasserstoffbindungen mittels der Amidgruppe bilden kann. Das führt zu einer dichteren molekularen Packung, die größtenteils das Verhalten an den Grenzflächen beeinflusst. Auf Basis dieser molekularen Betrachtung wurden mögliche Anwendungen erwogen und Tests zur Emulsionsbildung, zum Schäumvermögen und zur Benetzung durchgeführt. Aufgrund dieser Arbeit kann geschlussfolgert werden, dass eine geringe Änderung in der Struktur des Tensidmoleküls sehr wesentlich für technologische Systeme und Prozesse sein kann.
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