Viscoelasticity of CTAB:NaSal/W Detergent Micelles. Salt and Temperature Effects

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  • CTAB:NaSal/W 界面活性剤ミセルの粘弾性, 塩濃度ならびに温度効果

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Dynamic viscoelasticity is measured for threadlike micelles from cetyltrimethylammonium bromide (CTAB) in aqueous sodium salicylate (NaSal) solutions at temperatures T=25, 33, 40 and 50°C. The CTAB concentration of the solutions is fixed at CD=0.01M and a ratio of NaSal concentration CS to CD, CS/CD, is varied from 1 to 41.<BR>Effects of both CS/CD and T on frequency dependence of storage and loss shear moduli, G′(ω) and G″(ω), are described in this paper in detail. Characteristic features of this micelle system may be summarized as (1) at 25 and 33°C, the steady viscosity η and the mechanical relaxation time τM both show a minimum at CS/CD~4 that is followed by a maximum at CS/CD~10 as CS/CD increases. (2) The η and τM monotonically decrease with increasing T in the range of CS/CD from 1 to 20, but the maximum itself gradually disappears as T increases. (3) The steady state compliance Je is independent of T and decreases at lower CS/CD. A rapid increase in Je is observed at higher T and CS/CD ends. (4) An additional viscoelastic relaxation process is observed at the high frequency side. This mode appears in the same ω range independent of the salt concentration and exhibits the T dependence such as a type of the local friction factor, ηs/T. The discussion is mainly devoted to the applicability of a couple of models proposed so far.

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