High resolution imaging of the dolomite (104) cleavage surface by atomic force microscopy

Pina, Carlos M.; Pimentel, Carlos; García-Merino, Marta

doi:10.1016/j.susc.2010.07.019

Cited by 17 publications

(14 citation statements)

References 20 publications

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“…Because of the importance of carbonate minerals in various geological and environmental processes, there is a large body of work on their stability (De Titiloye et al, 1998;DeLeeuw, 2002;Geysermans and Noguera, 2009;Pina et al, 2010), growth (Raiteri et al, 2010) and dissolution (De Leeuw et al, 1999;Pokrovsky et al, 2009) mostly in aqueous environments and often in the presence of ionic species (Stipp and Hochella, 1991;Parker, 2000, 2001;Kerisit et al, 2003;Mielczarski et al, 2006;Rahaman et al, 2008;Geysermans and Noguera, 2009;Heberling et al, 2010), or their efficient use as desulfurization media (Bandosz, 2006). Carbonate formations are also of considerable importance in geologic storage of CO 2 in their capacity as caprock and injection reservoirs (Bacon et al, 2009;Wollenweber et al, 2010;Bachaud et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Molecular interactions of SO2 with carbonate minerals under co-sequestration conditions: A combined experimental and theoretical study

Glezakou

McGrail

Schaef

2012

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Molecular interactions of SO2 with carbonate minerals under co-sequestration conditions: A combined experimental and theoretical study

Glezakou

McGrail

Schaef

2012

Geochimica et Cosmochimica Acta

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“…23 High-resolution topography images of dolomite (104) were recently reported using the same setup. 24 Figure 2 shows a topography image and the corresponding friction map of a dolomite (104) surface on the microscale, immediately after cleaving and placing it in the fluid cell of the AFM. A significant increase in friction is found when crossing the step edges upward, which is similar to what is observed on cleavage steps of various crystal surfaces under ambient conditions 25 and in ultrahigh vacuum.…”

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confidence: 99%

Anisotropic surface coupling while sliding on dolomite and calcite crystals

Pina¹,

Miranda²,

Gnecco³

2012

Phys. Rev. B

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High-resolution friction force microscopy has been performed on the (104) surfaces of dolomite and calcite in deionized water. The two rows of oxygen atoms alternating in a zigzag way on top of both surfaces are resolved with similar contrast while scanning along the [421] direction. Along the [010] direction, only one row is resolved, provided that the normal loading is large enough. The direction-dependent interaction between the probing tip and surface atoms is explained by numeric calculations based on the Prandtl-Tomlinson model. With the exception of a few noticeable superlubric effects, 1 the sliding of two solid surfaces past each other is accompanied by stick-slip events due to the continuous formation and rupture of interatomic bonds. 2 On geological scales stick-slip is responsible for earthquakes and notoriously difficult to predict. The scenario radically changes at the nanoscale, where the loading and friction forces on sharp tips terminated by just a few atoms can be easily controlled and monitored by atomic force microscopy (AFM) in contact mode. 3 In the first approximation, the probing tip of an AFM can be considered a point mass driven by a lateral spring. This spring is associated with the torsion of a cantilever beam supporting the tip combined with the shear deformation of the contact region. 4 On a crystal surface the tip sticks to a lattice site till the spring elongation reaches a critical value and the tip suddenly jumps and binds again to another site in a stick-slip fashion. The friction forces developed in this process peak while scanning along a main crystallographic direction, the peak intensity being determined by the density of packing of the surface atoms.5 Systematic measurements of such "friction anisotropy" were reported on highly oriented pyrolitic graphite, 6 metallic quasicrystals, 7 and organic crystals.8 However, the results of the first study could only be explained by assuming the presence of a graphite flake attached to the tip apex, the second investigation did not report any friction maps on the atomic scale, and the third one did not reveal sublattice features in the complex surface structure. This was indeed possible on another organic crystal, where Fessler et al. were recently able to distinguish between two differently oriented molecules forming the unit cell of a surface lattice, although the direction of motion of the tip was kept fixed. 9In this article we have chosen the (104) cleavage surfaces of dolomite and calcite as prototype systems for studying the influence of the sliding direction on atomic stick-slip on surfaces of intermediate crystallochemical complexity. Mainly due to their interest for earth and environmental sciences, calcite and dolomite (104) surfaces have been extensively studied with numerous surface sensitive techniques.10-12 However, their tribological properties have scarcely been investigated. 13 The structure of the two surfaces is shown in Fig. 1 (104) one of the Ca atoms is ideally replaced by Mg. Here we show how, depending on th...

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“…CuPc shows a strong aggregation tendency, forming stacked arrangements driven by enthalpic (dense packing) arguments as well as by π-π interaction. In the single crystal 10 26,27 . The zigzag alignment of the spots suggests that the the contrast is due to the interaction of the tip apex with the O atoms protruding out of the surface rather than with the Mg 2+ or the Ca 2+ cations in the unit cell, which, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Molecular resolution friction microscopy of Cu phthalocyanine thin films on dolomite (104) in water

et al. 2014

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The reliability of ultrathin organic layers as active components for molecular electronic devices depends ultimately on an accurate characterization of the layer morphology and ability to withstand mechanical stresses on the nanoscale. To this end, since the molecular layers need to be electrically decoupled using thick insulating substrates, the use of AFM becomes mandatory. Here, we show how friction force microscopy (FFM) in water allows us to identify the orientation of copper(ii)phthalocyanine (CuPc) molecules previously self-assembled on a dolomite (104) mineral surface in ultra-high vacuum. The molecular features observed in the friction images show that the CuPc molecules are stacked in parallel rows with no preferential orientation with respect to the dolomite lattice, while the stacking features resemble well the single CuPc crystal structure. This proves that the substrate induction is low and makes friction force microscopy in water a suitable alternative to more demanding dynamic AFM techniques in ultra-high vacuum.

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High resolution imaging of the dolomite (104) cleavage surface by atomic force microscopy

Cited by 17 publications

References 20 publications

Molecular interactions of SO2 with carbonate minerals under co-sequestration conditions: A combined experimental and theoretical study

Molecular interactions of SO2 with carbonate minerals under co-sequestration conditions: A combined experimental and theoretical study

Anisotropic surface coupling while sliding on dolomite and calcite crystals

Molecular resolution friction microscopy of Cu phthalocyanine thin films on dolomite (104) in water

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