Small-angle neutron-scattering study of bis(quaternaryammonium bromide) surfactant micelles in water. Effect of the long spacer chain on micellar structure |
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| Authors: | N Hattori H Hirata H Okabayashi M Furusaka C J O'Connor R Zana |
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| Institution: | (1) Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan, JP;(2) BSF National Laboratory for High Energy Physics, 1-1 Oho, Tsukuba-shi Ibaraki 305-0801, Japan, JP;(3) Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand, NZ;(4) Institut C. Sadron, CNRS-ULP 6 rue Boussingault F-67083 Strasbourg Cedex, France, FR |
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| Abstract: | The microstructure of the normal micelles formed by dimeric surfactants with long spacers, Br−(CH3)2N+(C
m
H2
m
+1)-(CH2)
S
-(C
m
H2
m
+1)N+(CH3)2Br−, m = 10 and s = 8, 10 and 12], has been investigated by small-angle neutron scattering and compared with previously reported results for
micelles of the same dimeric surfactants with shorter spacers (m = 10 and s = 2, 3, 4 and 6). It was found that for dimeric surfactants with long spacers (s = 8 and 10), both micellar growth and variation in shape occur to only a small extent, if at all, compared with dimeric surfactants
with short spacers. However, for the dimeric surfactant with the longest spacer, s = 12, the extent of micellar growth and shape variation is also large. These results are due to the differences in conformation
of dimeric surfactants with short spacers (s = 2–6) compared with that of the surfactants with long spacers (s = 8–12).
Received: 15 June 1998 Accepted: 22 July 1998 |
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| Keywords: | Long spacer bis (quaternaryammonium bromide) micelle Small-angle-neutron scattering |
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