Wetting volume

Fig. 2. Total capacity vs cross-linkage for polystyreae sulfonic acid resin in the form where A and B correspond respectively to dry and wet weight capacity in meq/g of resin, and C represents wet volume capacity in meq/mL of wet setded resin.

Figure 19 Free volume plot for co(polyether)polyurethane membranes at 37°C for model drugs. D is the diffusion coefficient in cm2/sec, and H is the hydration expressed as (wet volume — dry volume)/wet volume. (Reproduced with permission from Ref. 59.)...

A sample of phosphonic acid resin Diaion CRP200 in wet Na+ form was kindly provided from Mitsubishi Chemical Co. Ltd. This wet resin sample was dried in vacuum, and then the resin with particle sizes of 60 - 32 mesh was selected by meshing. The selected resin was conditioned by treatment with 1 M HC1, water, 2 M NaOH, water, 1 M HC1, and water in successive. Finally, thus, the resin was changed into H+ form. The phosphorus content and acid capacity of the selected resin in the H+ form were measured according to the reported methods and were 4.6 mmol/g and 8.8 meq/g, respectively. Wet volume of the resin was 2.6 ml/g. Hereafter, this is abbreviated as CRP200 for simplicity. 

Manufacturers of organic pigments frequently use additives in an attempt to improve parameters such as the wetting time and wetting volume and thus to enhance the dispersibility of their products. The decision about each individual approach is usually made on the basis of empirical data concerning the application properties of the products. This is understandable in view of the fact that the dispersibility of a pigment is known to depend on its medium and on the conditions under which it is applied, a problem that is so complex that it is solved best by carrying out a series of pilot scale experiments in different vehicles. 

Values typical of standard resins. WVC = wet volume capacity)... 

BOX 4.7 Determination of Strong and Weak Base Wet Volume Capacity of an Anion Exchange Resin... 

Sole The value D may be used to derive or to check the total wet volume capacity ( VV(>). I) VC> mcej/g xg/ml = VV ( met /ml. Since the maximum error in VV( is the volume measurement, the determination of several D values to obtain a mean value will give a more accurate V (2 lietermination than a direct measurement. 

High operating capacity high wet volume capacity (WVC) low crosslinking small beads low selectivity... 

Addition of binder solution (wetting) volume of binder solution (L) centre = 2750 g [limits + 250 g]... 

Sometimes, high-resolution sampling is more important and only one total wet volume is measured (dry volumes can always be measured back home), whereas in other situations time is available (e.g., low recovery) to do two or even three measurements on each sample... 

Typical solid densities are 2.65 gm/cm for quartz and 2.72 gm/cm for carbonates. The total wet volume (Vi) can be determined using either a ring of known volume or a pycnometer. The bulk density can then be calculated directly (M,/V,). The density of solids (grain densify) can fhen be computed indirectly by subtracting the mass of the pore water (M ) from fhe fofal mass (MJ divided by the total volume (V,) minus the volume of water (V ). 

Research, Los Angeles, California), 1 ml (wet volume), was sufficient to bind 1.3 meq, or the cation present in 580 mg of the amine chloride. A sixfold excess of the resin was routinely used. The amine may be recovered from the cation exchange resin by elution with 1 N hydrochloric acid in 50% ethanol. 

Reflow The solder paste temperature exceeds the liquidus point and reflows, wetting both the component leads and the board pads. Surface tension effects occur, minimizing wetted volume. 

Consider now a column made of this material, with cross-sectional area S and a wet volume Sh (Figure 9.20). When the height increases from h to h + dh there is a corresponding change in capillary energy given by... 

---