Surfactant exudation

Javier I, Amalvy M.J, Unzue H.A.S, Jos M.A (2002) Reactive Surfactants in Heterophase Polymerization Colloidal Properties, Film-Water Absorption and Surfactant Exudation. J. Pol)m. Sci. 40 2994r-3000. 

Fischer et al. [101] investigated the simultaneous quantification of the content of several additives in PVC with an in-line diffuse reflectance probe. The signal from diffuse reflectance can be affected by a number of physical properties of the sample, rather than just its chemical make up. This makes obtaining quantitative data very difficult. Chemometric analysis showed the possibility of detecting even small amounts of additives (3%) with an absolute prediction error of 0.3%. Step-scan PA-FTIR spectroscopic studies were used to study surfactant exudation and film formation in PS-nBA latex films [102]. 

Quaternary alkylammonium salts are generally water-soluble surfactants. The sol-gel-derived anion-sensing membranes encapsulating a quaternary alkylammonium salt, especially with high contents, are easy to deteriorate due to the exudation of the cationic site from the membrane to aqueous sample phases. Moreover, another issue concerning the dispersibility of ammonium salts in sol-gel-derived membranes may happen when high... 

In some patients, this phase of mechanical obstruction is followed after some days or 3-4 weeks by a chemical reaction, presumably as the oil breaks down to irritant fatty acids, which cause exudation and hemorrhage. Interference with the production of lung surfactant can also occur and a marked intravascular cellular reaction has been described (70). The chemical irritative phase is marked by fever, cough with sputum (often blood) and a variable degree of respiratory distress there may even be tachycardia and hypotension. 

The difference between this site on the film and those that do not exude surfactant is that the local Concentration of SDS here is much higher. It is so high that no organic solvent is necessary to induce its mobility. In these films, which dry from the edges inward, the propagating front expels salts and surfactants into the wet cenue portion where they become increasingly concentrated. 

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