Negatively Charged Lipids Exhibit Negligible Effects on the Water Repellency of Montmorillonite Films
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- Univ. of Washington, Seattle, WA (United States). Dept. of Chemistry
- Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering
- Washington State Univ., Pullman, WA (United States). Dept. of Crop and Soil Sciences
- Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Amphiphilic molecules can alter the wettability of soil minerals. To determine how the headgroup chemistry of amphiphiles determines these effects, we investigate a system of the clay montmorillonite with long-chain phospholipids. We use phosphatidylglycerol (PG) phospholipids to contrast with our previous work using phosphatidylethanolamine lipids (PE). Zwitterionic PE lipids can sorb to the negatively-charged montmorillonite surface, whereas negatively-charged PG lipids cannot. Employing a suite of techniques from molecular dynamics, atomic force microscopy, fluorescence microscopy, and contact angle measurements, we define sample characteristics from molecular scale structure to the macroscopic wettability. We find that PG lipids do not significantly alter montmorillonite wetting characteristics, such as the contact angle, flow viscosity, and the characteristic timescale for droplet imbibition. In comparing PE and PG lipid/clay films, we find that, among the phospholipids compared, they must have three characteristics in order to change clay/lipid film wettability: they must bind to the mineral surface, be solid at room temperature, and have a relatively continuous distribution throughout the film.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
- Grant/Contract Number:
- AC05-76RL01830; DGE-1762114; DMR-171979; NNCI-1542101
- OSTI ID:
- 1639164
- Report Number(s):
- PNNL-SA-152157
- Journal Information:
- ACS Omega, Vol. 5, Issue 21; ISSN 2470-1343
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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