During the w/o/w emulsifying process in solvent evaporation technique dichloromethane diffuses from w/o droplets to external aqueous phase
and simultaneously water in the external phase back diffuses into droplets and finally PCL precipitates to form microspheres.
The volumes of the benzene and the aqueous phases
were 3 and 10 x [10.sup.-5] [m.sup.3], respectively.
This is due to the fact that the surfactant, in continuing to adsorb onto the polymer, is being abstracted from the aqueous phase
and therefore is not present to modify the solution's surface tension (same case as that which occurs during micellization).
Both products remained in a solid state at 5[degrees]C (41[degrees]F) and 7[degrees]C (45[degrees]F), and the 60 percent product softened and had a tendency to separate into oil and aqueous phases
at 21[degrees]C (70[degrees]F).
The oil and aqueous phases
are measured by Micro Motion meters into emulsion tanks from Feldmeier Equipment, Syracuse, N.Y.
Since the initial reaction bccurs at the interface of aqueous phase
and solvent phase, the interfacial area or volume, acid-base equilibria of BPA with NaOH, stirring rate (when an agitated reactor is used) are the important factors that affect the performance of interfacial polymerization.
The concentration of metal picrate remaining in the aqueous phase
was then measured spectrophotometrically .
Typically ionic strength increases extraction efficiency as a result of the commonly known salting-out effect--decreasing the solubility of analytes in the aqueous phase
thus enhancing partition into the organic phase [12,14].
We assume that there are two fluid phases (i.e., aqueous phase
and nonaqueous phase) existing at given temperature, pressure, and feed composition.
This investigation was carried out in gas phase for juglone and deprotonated juglone chelates, and the states of multiplicity adopted have been used in the aqueous phase
. The energies of the aforementioned multiplicity states are presented in Table 1.
The extractability of metal cations such as Mn2+ Co2+ Cu2+ Zn2+ and Pb2+ from aqueous phase
to organic phase with 19-nitro-6715162324-hexahydro-13H26H-1425-propanotribenzo- [bIo]-tetraoxadiazacycloikocine was investigated by means of UV-vis spectrophotometer.