Self Diffusion of Ionic Micelles in Crowded Solution: Effect of Phenyl Ring
Dynamical processes in micelles are complex and include multiple relaxation processes on local and global scales which can be studied experimentally via Quasi-elastic Neutron Scattering (QENS) techniques with combination of suitable spectrometers. Even if the structures of sodium dodecyl sulphate (SDS) and sodium dodecyl benzene sulfonate (SDBS) surfactants are very similar, SDBS has peculiar characteristics that derive from the presence of a phenyl group that may change entirely its properties through the formation of pi-stack aggregates. QENS spectra obtained earlier with IN5 spectrometer showed both global as well as internal motions of SDS micelles are faster than SDBS micelles. Molecular dynamics (MD) simulation and picoseconds resolved fluorescence spectroscopic measurement carried out by us indicated faster dynamics in SDS micelles. It is also found that the global and internal motions are strongly correlated. The aim of the proposed experiment is thus to investigate the dynamics using high resolution backscattering spectrometer such that the slower global motion could be observed independently.
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MUKHOPADHYAY Ramaprosad; JOHNSON Mark Robert; MITRA Subhankur; ORECCHINI Andrea and SEYDEL Tilo. (2015). Self Diffusion of Ionic Micelles in Crowded Solution: Effect of Phenyl Ring. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1399
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