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• W2062655673 abstract "Two aqueous suspensions (I and II) of an experimental synthetic disklike clay were studied by electrooptical methods. Conventional light-scattering experiments made on dilutions of I indicated disks of 166 × 106 weight-average molecular weight and a Z-average diameter of 550 nm. Changes in the scattered intensity were observed when either ac or pulsed electric fields were applied to the suspensions. With the use of pulsed fields, the accompanying induced birefringence of the sols was recorded. Fields up to 600 V cm−1 were employed. An existing theory for the light scattered by suspensions of disks in a dc field was extended to account for intensity changes in an ac field. Experimental data for sample I were interpreted in terms of a permanent dipole moment of 6.7 × 10−25 Cm across the disk width and a difference in the volume polarizabilities of 55.3 × 10−25 Cm which resulted in an induced moment occurring along a facial diameter of the disks. Pulsed-field scattering and birefringence transients were unusual in that the optical response initially increased only to fall again during the course of the applied pulse. With sample II, both transients underwent a reversal of sign in the optical birefringence and scattering changes. Average rotary diffusion constants of 27 sec−1 and 16 sec−1 for I and II, respectively, indicated a difference in particle sizes. The form of the optical transients was shown to be a direct consequence of two physical properties of the disks: the fact that the permanent and induced dipole moments were in quadrature and the fact that the relaxation times associated with the rotational response of each of these dipole moments in the field were of similar, but not identical, magnitude. Consistent with this interpretation is the indication that the different transients in the optical properties for I and II simply reflect a difference in particle size. This hypothesis fully accounts for the origin of the hitherto controversial birefringence reversal observed with bentonite sols. Although the synthetic clay suspensions did not exhibit any concentration dependence of the scattered intensity and birefringence reversals, the hypothesis presented herein readily explains the concentration dependence observed with bentonite dispersions. The complete study indicates the potential value of these electroptical studies." @default.
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• W2062655673 date "1970-04-01" @default.
• W2062655673 modified "2023-09-23" @default.
• W2062655673 title "Electrooptic study of an experimental synthetic clay in aqueous dispersion" @default.
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• W2062655673 doi "https://doi.org/10.1016/0021-9797(70)90153-0" @default.
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