The surface composition of Mica substrates

Poppa, H.; Elliot, A. G.

doi:10.1016/0039-6028(71)90225-1

Cited by 113 publications

(65 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Exposure of an UHV-cleaved mica surface to CO2, CO or CH4 did not result in any carbonaceous surface layer, and it was suggested that the presence of water vapour was necessary for the formation of the carbonaceous material [135]. Clearly, all these observations are consistent with the presence of K2CO3 on air cleaved surfaces, but not with adsorption of hydrocarbons or other common organic contaminants which would not remain on the surface at 500 °C.…”

Section: Surface Analytical Studies Of Air-cleaved and Vacuum-cleavedsupporting

confidence: 76%

“…Two years before the account of the non-evaporating capillary condensates was published, a study of the surface of cleaved mica with Auger spectroscopy [135] showed that the major surface contaminant on air-cleaved mica is a carbon compound that cannot be removed by heat treatment in UHV at 500 °C.…”

Section: Surface Analytical Studies Of Air-cleaved and Vacuum-cleavedmentioning

confidence: 99%

See 1 more Smart Citation

The nature of the air-cleaved mica surface

Christenson

Thomson

2016

Surface Science Reports

115

102

View full text Add to dashboard Cite

The accepted image of muscovite mica is that of an inert and atomically smooth surface, easily prepared by cleavage in an ambient atmosphere. Consequently, mica is extensively used a model substrate in many fundamental studies of surface phenomena and as a substrate for AFM imaging of biomolecules. In this review we present evidence from the literature that the above picture is not quite correct. The mica used in experimental work is almost invariably cleaved in laboratory air, where a reaction between the mica surface, atmospheric CO2 and water occurs immediately after cleavage. The evidence suggests very strongly that as a result the mica surface becomes covered by up to one formula unit of K2CO3 per nm 2 , which is mobile under humid conditions, and crystallizes under drier conditions. The properties of mica in air or water vapour cannot be fully understood without reference to the surface K2CO3, and many studies of the structure of adsorbed water on mica surfaces may need to be revisited. With this new insight, however, the air-cleaved mica should provide exciting opportunities to study phenomena such as two-dimensional ion diffusion, electrolyte effects on surface conductivity, and two-dimensional crystal nucleation.

show abstract

Section: Surface Analytical Studies Of Air-cleaved and Vacuum-cleavedsupporting

confidence: 76%

Section: Surface Analytical Studies Of Air-cleaved and Vacuum-cleavedmentioning

confidence: 99%

The nature of the air-cleaved mica surface

Christenson

Thomson

2016

Surface Science Reports

115

102

View full text Add to dashboard Cite

show abstract

“…On the other hand, Poppa and Elliot (1971) considered CO 2 sorption to cleaved mica surfaces at room temperature and concluded that H 2 O was probably necessary to form these surface complexes. Later workers suggested that CO 2 sorption to mica or clay surfaces depends on the formation of carbonate complexes by reaction with either mica/clay hydroxyls or H 2 O.…”

Section: Initial Materialsmentioning

confidence: 96%

Interaction of carbon dioxide with Na-exchanged montmorillonite at pressures to 640bars: Implications for CO2 sequestration

Giesting¹,

Guggenheim²,

Groos³

et al. 2012

International Journal of Greenhouse Gas Control

167

231

View full text Add to dashboard Cite

“…Mica, a widely found layered clay mineral and one of the most prominent mineral surfaces due to its atomic flatness A. Abdelmonem: Direct molecular-level characterization of freezing and chemical inertness produced by perfect cleavage parallel to the 001 planes (Poppa and Elliot, 1971), was selected as a model surface in this study. However, the image of an inert and atomically smooth surface prepared by cleavage of muscovite mica in an ambient atmosphere is not quite correct (Christenson and Thomson, 2016).…”

Section: Introductionmentioning

confidence: 99%

Direct molecular-level characterization of different heterogeneous freezing modes on mica – Part 1

Abdelmonem

2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. The mechanisms behind heterogeneous ice nucleation are of fundamental importance to the prediction of the occurrence and properties of many cloud types, which influence climate and precipitation. Aerosol particles act as cloud condensation and freezing nuclei. The surface-water interaction of an ice nucleation particle plays a major, not well explored, role in its ice nucleation ability. This paper presents a real-time molecular-level comparison of different freezing modes on the surface of an atmospherically relevant mineral surface (mica) under varying supersaturation conditions using second-harmonic generation spectroscopy. Two sub-deposition nucleation modes were identified (one-and two-stage freezing). The nonlinear signal at the water-mica interface was found to drop following the formation of a thin film on the surface regardless of (1) the formed phase (liquid or ice) and (2) the freezing path (one or two step), indicating similar molecular structuring. The results also revealed a transient phase of ice at water-mica interfaces during freezing, which has a lifetime of around 1 min. Such information will have a significant impact on climate change, weather modification, and the tracing of water in hydrosphere studies.

show abstract

The surface composition of Mica substrates

Cited by 113 publications

References 16 publications

The nature of the air-cleaved mica surface

The nature of the air-cleaved mica surface

Interaction of carbon dioxide with Na-exchanged montmorillonite at pressures to 640bars: Implications for CO2 sequestration

Direct molecular-level characterization of different heterogeneous freezing modes on mica – Part 1

Contact Info

Product

Resources

About