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Ultrasonic absorption Subject

Structural Aspects of Microemulsions. Several investigators have studied the structure of microemulsions using various techniques such as ultracentrifugation, high resolution NMR, spin-spin relaxation time, ultrasonic absorption, p-jump, T-jump, stopped-flow, electrical resistance and viscosity measurements (56-58). The useful compilation of different studies on this subject is found in the books by Robb (68) and Shah and Schechter (69). Several structural models of microemulsions have been proposed and we will discuss only a few important studies here. [Pg.15]

The rate of water exchange between the inner coordination sphere of rare earth ions and bulk water has been extensively studied by ultrasonic absorption and NMR spectroscopy. It is very fast and ranges between lO and 10 s (Cossy and Merbach 1988, Rizkalla and Choppin 1991). Ligand substitution processes and the kinetics of lanthanide complexation in water, especially with polyaminocarboxylates, have also been the subject of several studies (Lincoln 1986, Nash and Sullivan 1991). As for the determination of solvation numbers, investigations in anhydrous organic solvents are more sporadic. [Pg.359]

FTIR Spectra. After reaction, the mineral samples were subjected to ultrasonic treatment in acetone for periods of up to 1 hour. Transmission IR spectra of the released product fines from reactions of 60-mesh labradorite and microcline with 10 2 mol dm 3 CsCl in distilled water at 150 C for 47 days are presented in Figure 3. The spectrum obtained from of the labradorite reaction product (Figure 3(a)) is identical with that of a sample of natural pollucite (Figure 3(c)). The spectrum obtained from the microcline reaction product (Figure 3(b)) contains bands in the 500 cm""1 to 800 cm"1 region, due to unreacted microcline, in addition to the major bands of pollucite. Heating the samples overnight at 105 C resulted in the disappearance of the water absorption bands at about 3500 cm 1 and 1680 cm 1. [Pg.216]


See other pages where Ultrasonic absorption Subject is mentioned: [Pg.12]    [Pg.380]    [Pg.40]    [Pg.91]    [Pg.361]    [Pg.76]    [Pg.788]    [Pg.375]    [Pg.745]    [Pg.375]    [Pg.306]   
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Ultrasonic absorption

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