By various chemical techniques, we modify the surface charge on the filter surface which attracts the oppositely charged particles to the surface, enhancing the filtration efficiency. A student will carry out the filtration experiments and identify optimum surface composition for maximizing filtration efficiency. The modified solids are tested for their ability to remove chemical contaminants and microorganisms from water. The filters made with modified solids have been used to remove viruses, bacteria, and Cryptosporidium spp. from water. They can also remove heavy metals.
Mixed surfactants can increase the strength of the film.
This research will identify various molecular mechanisms to increase the strength of the adsorbed surfactant films. State of the art optical microscopy, digital imaging and image analysis will be used. The student will collect data from a number of on-line process control instruments. The goal of this project is to develop this library by recording spectra from a wide range of natural and synthetic particles. The statistical reliability of the identification will be tested with a range of naturally occurring particles.