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Scholars Day 2005, Wednesday, April 13

Intermolecular Interactions of Non-Ionic Surfactants with Water Utilizing Nuclear Magnetic Resonance Spectroscopy

Through the use of various nuclear magnetic resonance (NMR) studies we have studied the intermolecular interactions of two different surfactants with water. For both non-ionic surfactants a peak assignment has been completed and a structural theory of the intermolecular interactions has been developed. First, we investigated the intermolecular interactions between water and a non-ionic surfactant having an average of five ethoxy groups per alkyl chain (CaE5). Proton NMR has allowed for the development of the theory that as water content is increased the non-ionic surfactant will form various cross linking structures with the water molecules at specific surfactant molecule to water molecule ratios. Second, we continued our studies in similar fashion focusing on another non-ionic, surfactant consisting of seven ethoxy groups and two isopropoxy groups (CaE7P2). We also investigated what happens within the micellar aggregation of this surfactant in dilute aqueous solutions employing proton and carbon NMR relaxation measurements of the spherically shaped probe molecule D-limonene.

Presenter: Megan Bennett (Undergraduate Student)
Topic: Chemistry
Location: 121 Smith
Time: 2:30 pm (Session IV)