UPSI Digital Repository (UDRep)
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UPSI Digital Repository (UDRep)
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| Abstract : Universiti Pendidikan Sultan Idris |
| This research aimed to investigate the optimisation of hybrid CO2-philic surfactant chemical structure in stabilising water-in-Oo- (w/c) microemulsions. The optimisation was carried out by synthesise anionic surfactants analogue of AerosolOT(sodium bis (2-ethylhexyl) sulfosuccinate) template with the modification on hydrocarbon CO2-philic chain type and surfactant headgroup. Proton Nuclear Magnetic Resonance eH NMR) spectroscopy and CHNS-O elemental analysis were used to characterize the chemical structure and purity of the surfactants. The performances of surfactant were investigated through high-pressure phase behaviour, surface tension measurement, and UV-Visible spectroscopy. Research finding showed that fluorination on hybrid AOT analogue surfactant structure is the key factor affecting the CO2-philicity of the surfactant. The CO2-philicity of hybrid AOT analogue surfactants enhanced by utilising highly methylated branched hydrocarbon tail hence reduces the interfacial tension between CO2 and water interface. In conclusion, changing sulfosuccinate into sulfoglutaconate headgroup has found to gives influence in surfactant ability to stabilise w/c microemulsions. This study generates new insight of surfactant molecular structure requirement in designing hybrid CO2-philic AOT analogue surfactant. It is also beneficial for developing economic and non-bioaccumulative surfactants for CO2-based technology. |
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