Structure of lyotropic phases formed by sodium dodecyl sulfate in polar solvents

Small-angle X-ray diffraction study of the thermotropic and lyotropic phases of five alkyl cyclic and acyclic disaccharides: Influence of the linkage between the hydrophilic and hydrophobic moieties

“…The M α phase is not electrically stabilized as compared with ionic surfactants but its formation can be due to inter and intra molecular hydrogen bonds. However, the deformation of the cylinder crosssection is not strong enough to prevent the occurrence of the Ia3d phase as was reported in the SDS/water system [44]. In contrast to the cubic phases, hexagonal phases or lamellar phases, the parameters a and b of the centred rectangular phase increase with an increase of the surfactant and temperature.…”

Predictive synthesis of ordered mesoporous silica with maltoside and cationic surfactants based on aqueous lyotropic phase behavior

“…1d, which was obtained from an equilibrium mixture of 75 wt.% C 16 TAB, 5 wt.% C 12 G 2 , and 20 wt.% water. Since the higher order reflections (or at least a decisive reflection of d 12 or d 21 ) are missing, it is not possible to determine from this XRD pattern alone what type of lattice symmetry (pgg or cmm) it exhibits [66,70,71]. However, the R phase of the binary C 16 TAB-water system displays a large number of weak reflections that allowed it to be assigned to a cmm symmetry class [43].…”

Nuclear Magnetic Resonance and X-Ray Study of a Rectangular Phase

“…principle possible to determine the plane group symmetry In the rectangular (R a ) phase the surfactants form ''infi-of the R a phase (22). However, many reflections are needed nitely'' long cylinder-like aggregates (ribbons) organized on to distinguish among some of the plane groups, e.g., the pgg a two-dimensional rectangular lattice with primitive (pgg) or and cmm groups (23,24). Since several of the reflections centered (cmm) symmetry (10,11).…”

“…Since several of the reflections centered (cmm) symmetry (10,11). Since the ribbons in are very weak (23,24), it is a difficult task to secure the the R a phase exhibit an inhomogeneous interfacial mean plane group symmetry. However, from the four most intense reflections we exclude all two-dimensional plane group symmetries except the primitive (pgg) and centered (cmm) rect- generator, operating at 50 kV and 40 mA, provided CuK a radiation of wavelength 1.542 Å .…”