Fluorescence decay study of the adsorption of nonionic surfactants at the solid-liquid interface. 2. Influence of polar chain length

Adsorption of different amphiphilic molecules onto polystyrene latices

“…2, their detection in aqueous media is possible by means of a direct spectrophotometry method. Triton X-100 and Triton X-405 have already been well characterized by other authors [19][20][21][22][23]. However, less information was found for the ionic surfactants mentioned above.…”

“…Data measured in our lab using (a) spectrophotometry, (b) surface tension, and (c) conductivity. Other authors' data: (1) spectrophotometry [19], (2) pyrene 1:3 ratio [20], surface tension [21], and spectrophotometry [22]; (3) Sigma, FDS [23]; (4) [27].…”

“…However, it is well known that different methods lead to differences of up to 50% in the CMC. In Table 2, we show the CMC data obtained in our lab using several techniques: (a) spectrophotometry (Beckman DU 7400 spectrophotometer) in water at 25 • C, (b) surface tension (ADSA-P technique, pendant drop method) in pH 7 buffer (2 mM) at 23 • C, (c) conductivity in pH 7 buffer (2 mM) at 25 • C. We also include other authors' data (in water at 25 • C): (1) spectrophotometry [19]; (2) pyrene 1:3 ratio [20], surface tension [21], and spectrophotometry [22]; (3) Sigma, FDS [23]; (4) [27].…”

Aggregation of Non Ionic Surfactant Igepal in Aqueous Solution: Fluorescence and Light Scattering Studies

“…the CMC, their aggregation number (n), their size. The most frequently applied methods to determine aggregation number are various scattering methods and fluorescence quenching (FQ) method [11][12][13][14][15][16][17][18][19][20].…”

Supramolecular Structure of Surfactants Confined to Interfaces

“…The fluorescence quenching studies of Levitz 32,33 and Somasundaran 5 provided some of the first direct evidence for surface aggregates. Adapted from earlier work by Turro 34 and others on micellar solutions, this technique involves observing the quenching of the emission of a micelle-bound fluorophore by an added quencher.…”