저압에서 초임계영역까지의 이산화탄소와 니켈도금액의 계면장력 측정과 계면활성제의 영향

Abstract

The interfacial tension of Ni-plating solution+CO2 was measured by using the capillary rise method, which is requisite as a basic research for researching new electroplating using macroemulsion in supercritical CO2. The synthesized surfactant was sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-1-pentanol) sulfosuccinate which has CO2 philic chains and hydrophilic head group, and the experimental systems were water+CO2 and Ni-plating solution+CO2. In measuring the interfacial tension of Ni-plating solution+CO2, the effects of surfactant and ethanol were investigated. The interfacial tension of this system was decreased as the surfactant and ethanol were added into Ni-plating solution for Niplating solution+CO2 system, respectively. However, the interfacial tension of this system at constant temperature was increased as both the surfactant and ethanol were added into this solution simultaneously. This research is useful to select the proper surfactant and additives, and is effective to understand the interface phenomena between CO2 and polar chemicals such as water or Ni-plating solution for forming the micro-, and macroemulsion in the range of low pressure to supercritical state.