Quartz, solutions

Fig. 2.7. Relation between the pH and CP concentration of geothermal waters. The solid line indicates the albite-K-feldspar-muscovite-quartz-solution equilibrium at 250°C. For symbols used see caption to Fig. 2.2. (Shikazono, 1978a).

Froideval, A., Del Nero, M., Barillon, R., Hommet, J. Mignot, G. 2003. pH-dependence of uranyl retention in a quartz/solution system an XPS study. Journal of Colloid and Interface Science, 266, 221 -235. 

Use these data to evaluate %/k. What would be the value of the ratio V/I for this system What would be the rate of volume displacement if a current of 1.0 mA flowed through the apparatus Evaluate for the quartz-solution interface, assuming A = 145 cm2 eq-1 ohm-1 for 10-3NKNO3. 

Fuerstenau, D. W., Streaming potential studies on quartz in solutions of ammonium acetates in relation to the formation of hemimicelles at the quartz-solution interface , J. Phys. Chem., 60, 981-985 (1956). 

Figure 11 shows that greater free energy changes are required for both the solution and precipitation of quartz than for amorphous silica, based simply on the differences between their solubilities and solution rate constants. This may account in part for the frequent supersaturation of quartz solutions silica monomer can absorb to the quartz surface without actually becoming a part of the quartz structure. This effect is enhanced in solutions of decreasing ionic strength and pH where AG increases as 2 decreases. 

Electron spin resonance (ESR) measurements were made with a Varian E-3 spectrometer operating at an X-band frequency. Samples were prepared by compression molding as previously described. A quartz solution cell made by Wilmad Glass Co. was used for measurements on solutions. 

In absorption spectroscopy the sample is usually measured with respect to a reference, normally a cell with pure solution. By these means multiple reflections at the cell walls can be eliminated [42,56,57]. In Fig. 4.15 some of these multiple reflections are given for the light paths in the cell. They can amount to some percent depending on the absorption in the cell. In the UVA is range the refractive indices at the air/quartz or quartz/solution inter-... 

Fig. 4.15. Multiple reflections in a cell. R2 are the reflectivities at the quartz/solution and quartz/air interfaces, respectively. The refractive indices of the media are marked by 3 Only the essential light paths are drawn (/2. 4 transmittance coefficient T,- of the solution influences the intensity of the multiple reflected partial beams superimposing to form /(j.

It is obvious that the mechanical compaction is also a function of the duration of the influence exerted by the effective pressure on the framework of the rocks. Table 3.3 presents the characteristics of rocks comparable in granulometry and percentage of argillaceous cement, illustrating the extent of quartz solution under pressure. 

The solid line indicates the aibite-K-feidspar-muscovite-quartz-solution equilibrium at 250 °C (Shikazono 1978a, b). 

Quartz in solution does not form a sediment Quartz solution forms a sediment ... 

FIGURE 2.44 EQCM experiments on the mass change of a deposited amount of palladium on a gold-film quartz. Solution superdry solution of 0.1 mol.L" TBAI in DMF. Scan rate 10 mV s". Potential are referred to SCE (Cougnon, C., Ph.D. thesis, Universite de Rennes 1, 2002). 

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