Frequency Behavior of the Electro-optical Effect from Colloid Particles in Polyelectrolyte Solutions with Counterion Mixtures
✍ Scribed by Tsetska Radeva
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 103 KB
- Volume
- 187
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
in a specific way the electro-optical effect in polyelectrolyte The electric light scattering method was used to investigate solutions. In particular, the linear dependence of the lowthe frequency behavior of ferric oxide particles in carboxymethfrequency effect on the field strength in the presence of ylcellulose solutions containing mono-and divalent counterion monovalent counterions was found to change into quadratic mixtures. The dispersion curves of suspensions, stabilized by in the presence of divalent counterions (5). This change was polyelectrolyte adsorption, were analyzed in terms of three reaccompanied by an increase of the high-frequency effect laxations: rotational relaxation of the polymer-coated particles when CaCl 2 was added to the suspension (1).
( at frequencies below 1 kHz ) , low-frequency relaxation of the
In the present paper, we will try to show that the frequency bound counterions polarization ( at frequencies from 1 kHz to behavior of the effect in presence of simple salts can be 10 kHz ) and high-frequency relaxation of the free counterions polarization ( at frequencies above 60 kHz ) along the particle explained, considering the colloid-polymer system like axis. The frequency behavior of the electro-optical effect from polyelectrolyte solution containing mixtures of different suspensions containing polyelectrolyte with counterions mixcounterions. Resent studies of the transport phenomena and tures was explained in accordance with the theory that the fracion binding in polyelectrolyte solutions with counterions tion of free ( mono-and divalent ) counterions increases with mixtures (6) stimulated this work.
increasing the equivalent fraction of divalent ions in the mix-Some controversy remains, on the other hand, in the interture. Immobility of the strongly bound divalent counterions at pretation of the low-and high-frequency effects in polyeleclow field strengths is supposed to reduce their contribution in trolyte solutions in both experimental and theoretical aspects.
the low-frequency effect in comparison to the effect from the
There are many different approaches, concerning the counless bound monovalent counterions.