Structure and interaction of lithium dodecyl sulfate micelles in the presence of Li-specific macrocyclic cage: A study by SANS

Journal Article · Thu Oct 06 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100091a041· OSTI ID:6767985

Liu, Y C; Chen, S H ^[1]; Baglioni, P ^[2]; Teixeira, J ^[3]

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1. MIT, Cambridge, MA (United States)
2. Univ. of Florence (Italy)
3. Laboratoire Leon Brillouin, Gif-Sur-Yvette (France)

We study by small-angle neutron scattering (SANS) the interaction of macrocyclic cage CESTO (C[sub 17]H[sub 37]N[sub 5]) with lithium dodecyl sulfate micelles (LDS) in solution. At pH = 12.7 the CESTO molecule in aqueous solution is neutral and can complex one Li[sup +] ion, incorporating it into its cage. The result is the formation of a positively charged cage, and it is attracted by the negatively charged head groups of dodecyl sulfates in the micelle. We show that there is a strong tendency for the CESTO-Li[sup +] complex to be incorporated into the outer layer of the micelle with a consequence of a drastic reduction of the effective charge of the micelle. Using a two-layer model for the micellar structure factor and a multicomponent ionic solution theory of Khan and Ronis for the intermicellar structure factor, we have satisfactorily fitted all the SANS data at different surfactant concentrations and various molar ratios of CESTO to LDS. The extracted parameters include the micellar aggregation number, the effective micellar charge, and the fraction of CESTO incorporated into the outer layers of the micelle. 24 refs., 6 figs., 4 tabs.

• DOE Contract Number: FG02-90ER45429
• OSTI ID: 6767985
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:40; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400600 -- Radiation Chemistry
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BARYONS
CHEMICAL REACTIONS
COMPILED DATA
COMPLEXES
DATA
DISPERSIONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INFORMATION
LITHIUM COMPLEXES
LITHIUM COMPOUNDS
MATHEMATICAL MODELS
MICELLAR SYSTEMS
MIXTURES
NEUTRONS
NUCLEONS
NUMERICAL DATA
ORGANIC COMPOUNDS
SCATTERING
SOLUTIONS