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Article: Characterization of lecithin-taurodeoxycholate mixed micelles using small-angle neutron scattering and static and dynamic light scattering

TitleCharacterization of lecithin-taurodeoxycholate mixed micelles using small-angle neutron scattering and static and dynamic light scattering
Authors
Issue Date1994
Citation
Journal Of Physical Chemistry, 1994, v. 98 n. 16, p. 4402-4410 How to Cite?
AbstractWe have used small-angle neutron scattering (SANS) to probe the structure and interparticle interactions of lecithin-taurodeoxycholate mixed micelles. The data are fit to a core-shell model that provides the micelle composition and dimensions. The effects on the scattering spectra of electrostatic and excluded-volume interactions are explored in terms of the decoupling approximation (Kotlarchyk, M.; Chen, S.-H. J. Chem. Phys. 1983, 79, 2461) and the random phase approximation (Shimada, T.; Doi, M.; Okano, K. J. Chem. Phys. 1988, 88, 2815). We found the TDC-lecithin micelles are cylindrical particles with an average cross-sectional radius of 26.7 ± 0.4 Å. The core-shell structure is found to be an appropriate model for the highly hydrated micelles. The micelle length increases dramatically with an increase in added electrolyte, but not with decreasing concentration as previously reported. The SANS data analysis shows that particles in 0.05 M NaCl grow by less than 15% with a 3-fold decrease in the total surfactant concentration. This is in contrast to the simple interpretation of dynamic light scattering of the same samples that shows an apparent doubling of the micelle length with the same decrease in surfactant concentration. This discrepancy is attributed to neglect of the thermodynamic and hydrodynamic interactions in the analysis of the dynamic light scattering data. Corrections for the thermodynamic interactions are determined from the static data and applied to the interpretation of dynamic light scattering measurements. The strength of hydrodynamic and entanglement interactions is also discussed in relation to existing models for both semidilute polymer solutions and spherical particles. © 1994 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/92521
ISSN
1998 Impact Factor: 4.173
1999 SCImago Journal Rankings: 1.721

 

DC FieldValueLanguage
dc.contributor.authorLong, MAen_HK
dc.contributor.authorKaler, EWen_HK
dc.contributor.authorLee, SPen_HK
dc.contributor.authorWignall, GDen_HK
dc.date.accessioned2010-09-17T10:48:46Z-
dc.date.available2010-09-17T10:48:46Z-
dc.date.issued1994en_HK
dc.identifier.citationJournal Of Physical Chemistry, 1994, v. 98 n. 16, p. 4402-4410en_HK
dc.identifier.issn0022-3654en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92521-
dc.description.abstractWe have used small-angle neutron scattering (SANS) to probe the structure and interparticle interactions of lecithin-taurodeoxycholate mixed micelles. The data are fit to a core-shell model that provides the micelle composition and dimensions. The effects on the scattering spectra of electrostatic and excluded-volume interactions are explored in terms of the decoupling approximation (Kotlarchyk, M.; Chen, S.-H. J. Chem. Phys. 1983, 79, 2461) and the random phase approximation (Shimada, T.; Doi, M.; Okano, K. J. Chem. Phys. 1988, 88, 2815). We found the TDC-lecithin micelles are cylindrical particles with an average cross-sectional radius of 26.7 ± 0.4 Å. The core-shell structure is found to be an appropriate model for the highly hydrated micelles. The micelle length increases dramatically with an increase in added electrolyte, but not with decreasing concentration as previously reported. The SANS data analysis shows that particles in 0.05 M NaCl grow by less than 15% with a 3-fold decrease in the total surfactant concentration. This is in contrast to the simple interpretation of dynamic light scattering of the same samples that shows an apparent doubling of the micelle length with the same decrease in surfactant concentration. This discrepancy is attributed to neglect of the thermodynamic and hydrodynamic interactions in the analysis of the dynamic light scattering data. Corrections for the thermodynamic interactions are determined from the static data and applied to the interpretation of dynamic light scattering measurements. The strength of hydrodynamic and entanglement interactions is also discussed in relation to existing models for both semidilute polymer solutions and spherical particles. © 1994 American Chemical Society.en_HK
dc.languageengen_HK
dc.relation.ispartofJournal of Physical Chemistryen_HK
dc.titleCharacterization of lecithin-taurodeoxycholate mixed micelles using small-angle neutron scattering and static and dynamic light scatteringen_HK
dc.typeArticleen_HK
dc.identifier.emailLee, SP: sumlee@hku.hken_HK
dc.identifier.authorityLee, SP=rp01351en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-33751157915en_HK
dc.identifier.volume98en_HK
dc.identifier.issue16en_HK
dc.identifier.spage4402en_HK
dc.identifier.epage4410en_HK
dc.identifier.scopusauthoridLong, MA=7203019679en_HK
dc.identifier.scopusauthoridKaler, EW=7007157989en_HK
dc.identifier.scopusauthoridLee, SP=7601417497en_HK
dc.identifier.scopusauthoridWignall, GD=7006715125en_HK

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