Effect of surface state on shear stress anisotropy for muscovites

Metsik, M. S.; Kitaev, Yu.A.

doi:10.1007/bf01890938

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“…This can be visualised by decorating the freshly cleaved surface with charged particles, and the surface charge domains are found to be of the order of one mm 2 in size [68; 81; 82]. In an ambient atmosphere the charges are neutralised in a matter of minutes [67], and decay times of 2-8 minutes for surfaces at a r.h. of 30-48 % have recently been determined with AFM [83].…”

Section: The Cleavage Energy Of Mica In Vacuum and In Airmentioning

confidence: 99%

“…The surface area can be increased continuously and in principle reversibly (by rehealing the crack), thus satisfying the criterion for a thermodynamic measurement -quasistatic and reversible. Such an experiment was first carried out by Obreimoff in 1930 [10], and has been revisited many times with muscovite mica [67][68][69][70][71][72][73][74][75][76] as well as phlogopite [67; 77]. It can be shown that the force required to prise the two layers of mica apart, times the distance over which this force is applied, is equal to the sum of the surface free energy of the two exposed surfaces and the elastic energy stored in the bent sheets [10].…”

Section: The Cleavage Energy Of Mica In Vacuum and In Airmentioning

confidence: 99%

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The nature of the air-cleaved mica surface

Christenson

Thomson

2016

Surface Science Reports

114

102

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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.

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Section: The Cleavage Energy Of Mica In Vacuum and In Airmentioning

confidence: 99%