Bragg surfactants

Reppert, T.R. Bragg, J.R. Wilkinson, J.R. Snow, T.M. Maer Jr., N.K. Gale, W.W. Second Ripley Surfactant Flood Pilot Test in Proc., 7th Symposium on Enhanced Oil Recovery, Society of Petroleum Engineers Richardson, Texas, 1990, paper SPE/DOE 20219. 

Bragg, J.R., Gale, W.W, McElhannon Jr., W.A., Davenport, O.W., Petrichuk, M.D., Ashcraft, T.L., 1982. Loudon surfactant flood pilot test. Paper SPE 10862 presented at the SPE/DOE Enhanced Oil Recovery Symposium, Tulsa, 4—7 April. 

Hammond et al. [62] developed a periodic wall model to calculate the structure factor of MCM-41 mesoporous silica. This model is able to explain changes observed in the Bragg x-ray scattering when the surfactant is removed from the pores of the solid. Moreover the model is sensitive to pore packing order/disorder thus it could be useful to study other related materials like MSU-X, MCM-48, and so on. 

Table 11.1 Bragg spacings d), Specific surface area (Sbet), Pore volume (Vp), and pore diameter, for mesoporous silicas obtained at different concentrations of fluorinated surfactant, F(CF2)gC2H4(0C2H4)90H. (adapted from results described by SWbe and coworkers [52]).

The titration curves of the three polypeptides can be analyzed by adapting the Zimm-Bragg theory for the helix-coil transition " to the cooperative binding of the surfactant to the polypeptide, provided that the thermodynamic contribution of any conformational change accompanying the binding is comparatively small and that the electrical potential on the surface of the polypeptide molecule can be regarded to be constant. The theory defines two parameters the equilibrium constant s and an initiator a. If the polypeptide sequence is schematically written as... 

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