Surface tension measurements of bio-based magnetic nanocomposites in ethanol and water solutions
Separation of ethanol from water in the fermentation broth of biofuels requires a distillation process with high energy use. To reduce the energy cost of this process, emulsified bio-based superparamagnetic nanoparticles in castor oil are being studied. This work is the second step in determining the structure-property relationships for this process by evaluating the surface tension with variables of temperature and concentration which are key to emulsions formation. In this work, measurements of surface tension were taken for lignin@magnetite nanoparticles with a goniometer instrument. Magnetic and structural properties of the nanocomposites were obtained using a Vibrating Sampling Magnetometer (VSM) and Raman spectroscopy, respectively. Specifically, two studies were performed to test the effects of the magnetic nanoparticles on the surface tension of ethanol/water mixtures. The first experiment analyzed the impact of nanoparticles concentration in eight different ethanol/water aqueous solutions. The second experiment analyzed the temperature effects in surface tension at a constant nanoparticle concentration in a water solution. The lower concentrations of nanoparticles show little to no change in the surface tension; however, above 1 w/v% concentration, there is a decrease in surface tension of the dispersion. This decrease is also much higher at lower concentrations of ethanol and pure water. As temperature increases, surface tension decreased for all samples. The ultimate goal of this research is to determine the parameters in which bio-based nanoparticles can be used to create emulsions with magnetic properties for use in ethanol extraction from fermentation broths with energy-efficient liquid-liquid extractions.
Primary Advisor's Department
Stander Symposium poster
"Surface tension measurements of bio-based magnetic nanocomposites in ethanol and water solutions" (2019). Stander Symposium Posters. 1693.