Graduate Thesis Or Dissertation
 

Exploring mechanisms that drive the development of reversible soil hydrophobicity

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  • This study focuses on one widespread characteristic of poor soil quality: hydrophobic soil. Previous research has produced conclusive evidence to show that soil hydrophobicity is affected by soil organic matter (SOM) and soil water content (WC). Hydrophobicity that responds to changes in WC is a unique form of surface hydrophobicity and is termed "reversible hydrophobicity" (RHP). Recent experimental results support an amphiphilic model for SOM, which contains mechanisms for the occurrence of RHP. What has not been directly demonstrated, however, are conformational changes in the orientation of amphiphilic moieties as an effect of WC that would be associated with RHP. Quincy soils, which exhibit RHP, were investigated at varying WC using Photoacoustic Fourier transform infrared spectroscopy (Pas-FTIR), chemical analysis of carbon:nitrogen, and physical measurement of hydrophobicity, using the Capillary Rise Method and the Sessile Drop Method, in order to reveal how SOM and water interact to drive the creation of hydrophobic surfaces. This investigation suggests that SOM and water interact at the molecular scale to drive hydrophobic phenomena at the field-scale.
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