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摘要
A new phase separation system, aqueous multiphase system (MuPSs, ranging from two to four phases), containing surfactants and polymer (SDS/DTAB/PEG/NaBr/H2O) was designed and the complicated four-phase systems were investigated systematically. To interpret the phase separation phenomena, the phase composition, phase density, phase volume ratio between the studied phase and the whole system as well as the particle size and zeta potential of aggregates in each phases were investigated. The results have shown that the multiphase system contains liquid crystal phase, which may imply a close relationship between MuPSs and liquid crystal. At the same time, it seems there is a direct relationship between zeta potential of the existed phase and the appearance of new phase. Phase composition analysis results illustrate that the rich component for the three phases from top to the third one are PEG, DTAB, and SDS, respectively. However, the bottom phase is almost dilute brine. Furthermore, the differential scanning calorimetry experiments prove that the micro-complexity of aggregates in different phases is different from each other. The studied MuPSs are very stable but temperature sensitive; the coexisted phases have different extraction power to xylenol orange because of the variation of composition. The higher stability of MuPSs makes it useful when the storage and long-term stability of the separation media are important. The work not only provides theoretical guidance for the development of efficient extraction and separation technology but also provides new opportunities for the development of aqueous multiphase systems.
- 出版日期2014-7-20
- 单位华东理工大学
