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Role of an amide bond for self-assembly of surfactants

Romain Bordes (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Juergen Tropsch ; Krister Holmberg (Institutionen för kemi- och bioteknik, Teknisk ytkemi)
Langmuir (0743-7463). Vol. 26 (2010), 5, p. 3077-3083.
[Artikel, refereegranskad vetenskaplig]

Self-assembly in Solution and adsorption at the air-water interface and at Solid Surfaces were investigated for two amino-acid-based surfactants with conductimetry, NMR, tensiometry, quartz crystal microbalance with monitoring or the dissipation (QCM-D), and surface plasmon resonance (SPR). The surfactants studied were sodium N-lauroylglycinate and sodium N-lauroylsarcosinate, differing only in a methyl group on the amide nitrogen for the sarcosinate. Thus, the glycinate but not the surfactant is capable of forming intermolecular hydrogen bonds via the amide group. It was found that the amide bond, N-methylated or not, gave a substantial contribution to the hydrophilicity of the amphiphile. The ability to form intermolecular hydrogen bonds led to tighter packing at the air-water interface and ill a hydrophobic surface. It also increased the tendency for precipitation as all acid-soap pair oil addition of acid. Adsorption of the surfactants at a gold surface Was also investigated and gave unexpected results. The sarcosine-based surfactant seemed to give bilayer adsorption, while the glycine derivative adsorbed as a monolayer.



Denna post skapades 2010-03-03. Senast ändrad 2016-08-16.
CPL Pubid: 117147

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
SuMo Biomaterials

Ämnesområden

Kemi
Kemiteknik
Annan kemiteknik

Chalmers infrastruktur