Vapor adsorption on mica and silicon: entropy effects, layering, and surface forces

Beaglehole, D.; Christenson, Hugo K.

doi:10.1021/j100187a040

Cited by 212 publications

(249 citation statements)

References 1 publication

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“…This was achieved through humidity reduction in the atmosphere surrounding the sample. While cellular chromatin is in a more aqueous environment than that employed here, it has been shown that a 1 A thick layer of water is present on mica in 10% humidity (Beaglehole & Christenson, 1992). Owing to the hygroscopic nature of residual buffer salts, it is likely that even more moisture resides around the chromatin, allowing for more physiologically relevant chromatin structures to be observed.…”

Section: Discussionmentioning

confidence: 80%

Visualization of Nucleosomal Substructure in Native Chromatin by Atomic Force Microscopy

Martin

Vesenka²,

Henderson³

et al. 1995

Biochemistry

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Section: Discussionmentioning

confidence: 80%

Visualization of Nucleosomal Substructure in Native Chromatin by Atomic Force Microscopy

Martin

Vesenka²,

Henderson³

et al. 1995

Biochemistry

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“…The conditions of transition between these two modes can be very complicated and have been the subject of several studies [17,18]. A recent work from Zitzler [19] has shown that the critical oscillation amplitude that triggers the transition between IC and NC modes on a silica glass surface is an increasing function of the relative humidity and, thus, of the thickness of the condensed water layer, according to experimental investigations performed by Beaglehole and Christenson [20]. The estimation of the energy which is dissipated in the tip-surface interaction is consistent with a model based on the formation and rupture of a capillary neck (1) between the AFM tip and the nanometric water layer.…”

Section: Resultsmentioning

confidence: 99%

Dynamic condensation of water at crack tips in fused silica glass

Ciccotti¹,

George²,

Ranieri³

et al. 2008

Journal of Non-Crystalline Solids

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Water molecules play a fundamental role in the physics of slow crack propagation in glasses. It is commonly understood that, during stress-corrosion, water molecules that move in the crack cavity effectively reduce the bond strength at the strained crack tip and, thus, support crack propagation. Yet the details of the environmental condition at the crack tip in moist air are not well determined. In a previous work, we reported direct evidence of the presence of a 100 nm long liquid condensate at the crack tip in fused silica glass during very slow crack propagation (10 -9 to 10 -10 m/s). These observations are based on in-situ AFM phase imaging techniques applied on DCDC glass specimens in controlled atmosphere. Here, we discuss the physical origin of the AFM phase contrast between the liquid condensate and the glass surface in relation to tip-sample adhesion induced by capillary bridges. We then report new experimental data on the water condensation length increase with relative humidity in the atmosphere. The measured condensation lengths were much larger than what predicted using the Kelvin equation and expected geometry of the crack tip.

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“…Again using DMT theory, this repulsive interaction is given by F r =−͑4 / 3͒E * R 1/2 ͑a 0 − d͒ 3/2 , where The capillary force arises from the interactions between thin films of water of depth h that cover the sample and cantilever tip due to ambient humidity. 6,[15][16][17] As the separation d falls below a critical distance d on =2h, a connective column of liquid is established. Upon retracting away from the surface, the liquid column forms a meniscus and neck, until eventually breaking as the separation increases beyond a critical distance d off = V 1/3 − V 2/3 / 5R, where V is the meniscus volume.…”

Section: The Physical Modelmentioning

confidence: 99%

The nonlinear dynamics of tapping mode atomic force microscopy with capillary force interactions

Hashemi

Dankowicz

Paul

2008

Journal of Applied Physics

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We study the nonlinear dynamics of a tapping mode atomic force microscope with tip-surface interactions that include attractive, repulsive, and capillary force contributions using numerical techniques tailored for hybrid or discontinuous dynamical systems that include forward-time simulation with event handling and numerical pseudo-arclength continuation. We find four branches of periodic solutions that are separated by windows of complex and irregular dynamics. The branches of periodic solutions end where the cantilever comes into grazing contact with event surfaces in state space, corresponding to the onset of capillary interactions and the onset of repulsive forces associated with contact. These windows of irregular dynamics are found to coexist with the periodic branches of solutions as well as exist beyond the termination of the periodic solution. Finally, we show that these details can be overlooked unless one is careful to sample the dynamics appropriately.

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Vapor adsorption on mica and silicon: entropy effects, layering, and surface forces

Cited by 212 publications

References 1 publication

Visualization of Nucleosomal Substructure in Native Chromatin by Atomic Force Microscopy

Visualization of Nucleosomal Substructure in Native Chromatin by Atomic Force Microscopy

Dynamic condensation of water at crack tips in fused silica glass

The nonlinear dynamics of tapping mode atomic force microscopy with capillary force interactions

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