Chlorobenzene, relaxation time

Figure 2. Reciprocal conductance relaxation times as a function of the square root of TBAP concentration in media and concentration range where conductance indicates a preponderance of the simple ions. TBAP in diphenyl ether (D— 3,55) at 318 ( ). TBAP in benzene-chlorobenzene (60 40 v/v D = 3, 55) at 298 (A). TBAP in benzene-chlorobenzene (60 40 v/v D = 3, 64) at 298 and 350 atm (2). TBAP in benzene-chlorobenzene (60 40 v/v D = 3, 36) at 323 (0).

Figure 3. Dependence of the reciprocal conductance relaxation time on TBA— salt concentration in media and concentration range where conductance indicates an important fraction of triple ions. TBA-bromide in benzene-nitrobenzene (3, 22 vol % D = 2, 90) at 298 ( ). TBA-picrate in benzene-chlorobenzene (16 vol % D = 2, 78) at 298 (0).

As a second example we turn to the analysis of the conductance relaxation observed in tetrabutylammonlun plcrate in benzene-chlorobenzene over the concentration range 0.1—2 x 10 M as shown in Figure 3. A qualitative, but important difference with the previous example is the linear relation between reciprocal relaxation time and total TBAP-concentratlon. 

From the pressure dependence of the dissociation process of the tetrabutylammoniurapicrate (TBAP) ion-pair in mixtures of benzene-chlorobenzene (2.27 D 3.87) the volume change of the dissociation (AV) and the activation volumina for ionic dissociation, respectively ionic recombination (AV, resp. AV ) were obtained. The volume change of ionic dissociation was evaluated from conductance data at different pressures while the activation volumina were obtained from the pressure-dependence of the relaxation time of the dissociation equilibrium. Relaxation measurements were performed with the electric field modulation technique. 

According to Ref. [56], the experimentally-observed broad band might be composed of a number of overlapping absorption lines, the widths of whidi would be determined by the lifetime of the pseudo-4attice state , and which would be expected to be of the order of the dielectric relaxation time. Microwave spectra and viscosity measurements in chlorobenzene yielded the value of the... 

F ure 3 C13 relaxation times of carbons at various temperatures in chlorobenzene-d. ... 

On the other hand, it was found that the microscopic parameter pH(c) exhibits close similarities to the macroscopic viscosity r (c)/r s of a low molecular mass (M 7.400 g/mol) PDMS/d-chlorobenzene system at 373 K. For that low molar mass the terminal Zimm time tz [see Eq. (80)] is comparable to the time scale of the NSE experiment. Thus, the macroscopic viscosity can relax towards... 

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