- Email: [email protected]
Surfactant monolayer rigidities from Kerr effect measurements on microemulsions
Volume 187, number 5
CHEMICAL PHYSICS LETTERS
20 December I99 1
Erratum M. Borkovec and H.-F. Eicke, Surfactant monolayer rigidities from Kerr effect measurements on microemulsions, Chem. Phys. Letters 157 ( 1989) 457. The evaluation of the rigidity pK=
’
K
was based on the formula
-1
(1)
24( Iu~,~I~) + 481~
where ( ]uZrn]*> = 0.08 ? 0.02 was measured by the Kerr effect. Until 1989 the reported root means square relative polydispersities & obtained from small-angle scattering experiments were mostly around 0.25-0.30. Such large values have led us to the conclusion that the second term in eq. ( I ) can be neglected and the bending energy estimates are insensitive to the polydispersity. Recently, however, much smaller polydispersities have been reported in the same system using light scattering techniques near the optical matching point [ 11. These authors have questioned the previous values of the polydispersity and reported polydispersities of &=0.12-C 0.02. Using this value in eq. ( 1) we have to revise our original estimate of the rigidity to @c= I .Oz!z0.2. This estimate is in agreement with @c= 1.I measured by ellipsometry on the same system [ 21.
References [I] Y.D. Yan and J.H.R. Clarke, J. Cbem. Phys. 93 (1490) 4501; J. RiEka, M. Borkovecand U. Hofmeier, J. Chem. Phys. 94 (1991) 8503. [ 21 B.P. Binks, J. Meunier, 0. Abillon and D. Langevin, Langmuir 5 ( 1989) 415; B.P. Binks, H. Kellay and J. Meunier, Europhys. Letters 16 (1991) 53.
***
554
CHEMICAL PHYSICS LETTERS
20 December I99 1
Erratum M. Borkovec and H.-F. Eicke, Surfactant monolayer rigidities from Kerr effect measurements on microemulsions, Chem. Phys. Letters 157 ( 1989) 457. The evaluation of the rigidity pK=
’
K
was based on the formula
-1
(1)
24( Iu~,~I~) + 481~
where ( ]uZrn]*> = 0.08 ? 0.02 was measured by the Kerr effect. Until 1989 the reported root means square relative polydispersities & obtained from small-angle scattering experiments were mostly around 0.25-0.30. Such large values have led us to the conclusion that the second term in eq. ( I ) can be neglected and the bending energy estimates are insensitive to the polydispersity. Recently, however, much smaller polydispersities have been reported in the same system using light scattering techniques near the optical matching point [ 11. These authors have questioned the previous values of the polydispersity and reported polydispersities of &=0.12-C 0.02. Using this value in eq. ( 1) we have to revise our original estimate of the rigidity to @c= I .Oz!z0.2. This estimate is in agreement with @c= 1.I measured by ellipsometry on the same system [ 21.
References [I] Y.D. Yan and J.H.R. Clarke, J. Cbem. Phys. 93 (1490) 4501; J. RiEka, M. Borkovecand U. Hofmeier, J. Chem. Phys. 94 (1991) 8503. [ 21 B.P. Binks, J. Meunier, 0. Abillon and D. Langevin, Langmuir 5 ( 1989) 415; B.P. Binks, H. Kellay and J. Meunier, Europhys. Letters 16 (1991) 53.
***
554