Deciphering Adsorption Structure on Insulators at the Atomic Scale

doi:10.2172/1323606

GSTDTAP > 地球科学

DOI	10.2172/1323606
报告编号	SAND2014--17839
来源ID	OSTI ID: 1323606
	Deciphering Adsorption Structure on Insulators at the Atomic Scale
	Thurmer, Konrad; Feibelman, Peter J.
	2014-09-01
出版年	2014
页数	14
语种	英语
国家	美国
领域	地球科学
英文摘要	We applied Scanning Probe Microscopy and Density Functional Theory (DFT) to discover the basics of how adsorbates wet insulating substrates, addressing a key question in geochemistry. To allow experiments on insulating samples we added Atomic Force Microscopy (AFM) capability to our existing UHV Scanning Tunneling Microscope (STM). This was accomplished by integrating and debugging a commercial qPlus AFM upgrade. Examining up-to-40-nm-thick water films grown in vacuum we found that the exact nature of the growth spirals forming around dislocations determines what structure of ice, cubic or hexagonal, is formed at low temperature. DFT revealed that wetting of mica is controlled by how exactly a water layer wraps around (hydrates) the K⁺ ions that protrude from the mica surface. DFT also sheds light on the experimentally observed extreme sensitivity of the mica surface to preparation conditions: K atoms can easily be rinsed off by water flowing past the mica surface.
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/6483
专题	地球科学
推荐引用方式 GB/T 7714	Thurmer, Konrad,Feibelman, Peter J.. Deciphering Adsorption Structure on Insulators at the Atomic Scale,2014.