The influence of surfactants on separation processes involving membranes was written by Simion, Demetra;Niculescu, Olga;Gaidau, Carmen;Simion, Marius;Popescu, Georgeta;Chelaru, Ciprian. And the article was included in Revista de Pielarie Incaltaminte in 2011.Name: 1-Dodecylpyridin-1-ium bromide This article mentions the following:
The influence of surfactants upon the wettability of some hydrophobic microporous membranes of polysulfone was studied by determining the contact angle and the ultrafiltration rates. The water-membrane contact angle increases with roughness and changes in presence of the surfactant in aqueous solution to an extent which depends on its nature and concentration The variations of contact angle of surfactant in aqueous solution are in good agreement with the variation of the rate of ultrafiltration solutions through membranes and with the adsorption of surfactants on polysulfone surface. The method of measuring the contact angle is simple and rapid; it may be employed in characterization of polysulfone membrane, hydrophobicity in spite of the scattering of values obtained of microporous surfaces. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Name: 1-Dodecylpyridin-1-ium bromide).
1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Name: 1-Dodecylpyridin-1-ium bromide