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Observation of Micellar Formation in the Cavity of Porous Silica Glass

Published online by Cambridge University Press:  21 February 2011

K.F. Bradley ,
S-H Chen  and
P. Thiyagarajan
K.F. Bradley
Affiliation:
Department of Physics; Brown University; Providence, RI 02912
S-H Chen
Affiliation:
Nuclear Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02138
P. Thiyagarajan
Affiliation:
Intense Pulsed Neutron Source; Argonne National Laboratory, Argonne, IL 60439
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Abstract

The small angle neutron scattering intensity distribution from the empty pores of the silica glass Vycor can be satisfactorily interpreted using a simplified late stage spinodal decomposition model, due to Cahn', if one allows for a distribution of wave numbers in the material's density function. The result confirms that the porosity of the glass is 28% and gives the mean wave number of the density wave to be k0 = 0.0285 Å-−1 with a dispersion, δk / k0, of about 0.29. Small angle neutron scattering measurements of the anionic surfactant SDS in the Vycor pores indicate that when the surfactant is introduced into the pores at 80 × CMC in bulk solution, the surfactant forms micelles with the same average micelle separation distance as in the bulk solution, but the distribution of micelle separations is much greater in the glass pores.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 403
Copyright
Copyright © Materials Research Society 1990

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References

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