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Physical structures of lipid layers on pyrite

机译:黄铁矿上脂质层的物理结构

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The physical structures of lipid layers on pyrite (FeS2), a ubiquitous sulfide mineral, were studied in air and in water by atomic force microscopy (AFM). Egg PC, a phospholipid that forms bilayer structures on atomically flat substrates, was investigated, and our experimental observations show that this lipid formed bilayers on an atomically rough pyrite surface, as inferred by a measured layer thickness of 5.0 +/- 0.2 nm. The surface coverage of the lipid coating increased from approximately 15% to 80% when the concentration of the lipid suspension was increased from 0.014 to 0.15 mM. Although further increases up to 1.5 mM resulted in an incremental increase in surface coverage of only 5%, multilayer structures of 20- to 40-nm height formed on top of the first bilayer. The findings provide a structural explanation for the results of earlier kinetic studies showing that the presence of the lipid decreases the rate of pyrite oxidation in air and in water. Lipid coatings applied to iron-sulfide bearing minerals are a possible approach to preventing oxidation and acidification and thereby mitigating environmental damage that can result from acid mine drainage.
机译:通过原子力显微镜(AFM)研究了空气和水中黄铁矿(FeS2)(一种普遍存在的硫化物)上脂质层的物理结构。研究了Egg PC(一种在原子平坦的基底上形成双层结构的磷脂),我们的实验观察结果表明,该脂质在原子粗糙的黄铁矿表面上形成了双层,这是由5.0 +/- 0.2 nm的测得层厚推断得出的。当脂质悬浮液的浓度从0.014增加到0.15mM时,脂质涂层的表面覆盖率从约15%增加到80%。尽管进一步增加到1.5 mM导致表面覆盖率仅增加了5%,但在第一双层的顶部形成了20至40 nm高度的多层结构。这些发现为早期动力学研究的结果提供了结构性解释,表明脂质的存在降低了空气和水中黄铁矿的氧化速率。涂在含硫化铁的矿物上的脂质涂层是防止氧化和酸化,从而减轻由酸性矿山排水引起的环境损害的一种可能方法。

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