Wang-Landau Monte Carlo simulation of capillary forces at low relative humidity in atomic force microscopy

Harrison, Aaron J.; Beaudoin, Stephen P.; Corti, David S.

doi:10.1080/01694243.2016.1143581

Cited by 14 publications

(10 citation statements)

References 44 publications

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“…For example, AFM-based experimental evidence obtained demonstrates a decrease in the capillary force between hydrophilic surfaces with increasing RH, implicating tip apex shape and size as the origin of the change of the adhesion force with RH. The fact that hydrophilic samples do not necessarily exhibit an increase in the capillary force with increasing humidity appears to be consistent with the reported theoretical models, where completely wetting tips were found to exhibit maximum capillary force with increasing RH, while partially wetting or partially drying tips remained relatively independent of RH …”

Section: Resultssupporting

confidence: 90%

“…The fact that hydrophilic samples do not necessarily exhibit an increase in the capillary force with increasing humidity 30 appears to be consistent with the reported theoretical models, 31 where completely wetting tips were found to exhibit maximum capillary force with increasing RH, while partially wetting or partially drying tips remained relatively independent of RH. 30 …”

Section: Resultssupporting

confidence: 89%

“…The fact that hydrophilic samples do not necessarily exhibit an increase in the capillary force with increasing humidity 31 appears to be consistent with the reported theoretical models, 32 where completely wetting tips were found to exhibit maximum capillary force with increasing RH, while partially wetting or partially drying tips remained relatively independent of RH. 31 Finally, the adhesion forces presented here are measured under essentially the same temperature and humidity conditions for all of the prepared tips, which lend itself well for comparative and relative studies of the selected materials. Considering the many factors at play such as tip size, tip shape, tip chemistry, tip surface morphology, temperature, RH, tip− sample distance, sample surface chemistry and morphology, and local tip−sample dynamics, clearly much deeper studies of the dependence of the tip−sample capillary adhesion forces are anticipated.…”

Section: ■ Results and Discussionsupporting

confidence: 89%

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Atomic Force Microscopy and Infrared Nanospectroscopy of COVID-19 Spike Protein for the Quantification of Adhesion to Common Surfaces

et al. 2021

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The COVID-19 pandemic has claimed millions of lives worldwide, sickened many more, and has resulted in severe socioeconomic consequences. As society returns to normal, understanding the spread and persistence of SARS CoV-2 on commonplace surfaces can help to mitigate future outbreaks of coronaviruses and other pathogens. We hypothesize that such an understanding can be aided by studying the binding and interaction of viral proteins with nonbiological surfaces. Here, we propose a methodology for investigating the adhesion of the SARS CoV-2 spike glycoprotein on common inorganic surfaces such as aluminum, copper, iron, silica, and ceria oxides as well as metallic gold. Quantitative adhesion was obtained from the analysis of measured forces at the nanoscale using an atomic force microscope operated under ambient conditions. Without imposing further constraints on the measurement conditions, our preliminary findings suggest that spike glycoproteins interact with similar adhesion forces across the majority of the metal oxides tested with the exception to gold, for which attraction forces ∼10 times stronger than all other materials studied were observed. Ferritin, which was used as a reference protein, was found to exhibit similar adhesion forces as SARS CoV-2 spike protein. This study results show that glycoprotein adhesion forces for similar ambient humidity, tip shape, and contact surface are nonspecific to the properties of metal oxide surfaces, which are expected to be covered by a thin water film. The findings suggest that under ambient conditions, glycoprotein adhesion to metal oxides is primarily controlled by the water capillary forces, and they depend on the surface tension of the liquid water. We discuss further strategies warranted to decipher the intricate nanoscale forces for improved quantification of the adhesion.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

Section: ■ Results and Discussionsupporting

confidence: 89%

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Atomic Force Microscopy and Infrared Nanospectroscopy of COVID-19 Spike Protein for the Quantification of Adhesion to Common Surfaces

et al. 2021

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“…Among those factors, RH dependence is so significant that it has been extensively investigated. Three computational and numerical methods have been applied to study RH dependence: the Kelvin equation, ,, lattice density functional theory, and Monte Carlo simulation. , On the Kelvin equation, the Kelvin radius of a water bridge due to capillary condensation is dependent on RH. The capillary force can be expressed via the Young–Laplace equation.…”

Section: Introductionmentioning

confidence: 99%

Different Evolution Behaviors of Adhesion Force with Relative Humidity at Silica/Silica and Silica/Graphene Interfaces Studied using Atomic Force Microscopy

et al. 2021

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The influence of relative humidity (RH) on adhesion forces demands clarification. Adhesion forces at silica/silica and silica/graphene interfaces were measured on an atomic force microscope to investigate the evolution behaviors with RH and the contact time dependence at a certain RH. For the silica/silica interface, the adhesion force at a location by decreasing RH is independent of RH, but increases as a whole with RH both at a location and in the force volume mode by increasing RH. However, for the silica/graphene interface at a location, the adhesion force remains unchanged with RH as a whole by reducing RH and tends to decrease as a whole by increasing RH. In the force volume mode, the adhesion force at the silica/graphene interface is independent of RH. For the silica/silica interface, the adhesion force increases logarithmically with dwell time at a low RH and remains unchanged at a high RH. However, for the silica/graphene interface, the force is not dependent on RH at low and high RHs. The results can serve to further understand the mechanisms and behaviors of adhesion forces and promote the anti-adhesion design for small-scale silicon-based structures.

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“…Among them, the force exerted by a liquid bridge (capillary force) has a great effect on the reliability of MEMS. It was reported that, even at low relative humidity (RH), the capillary force cannot be ignored when involving hydrophilic surfaces . In atmospheric air, the capillary force is usually regarded as the dominant contribution of adhesion force, which is the major factor in the failure of MEMS (stiction). , The stiction can occur in a wide range of MEMS components: accelerometers, resonators, micromirrors, micromotors, radio frequency (RF) MEMS switches, and so forth .…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Dynamic Behaviors of a Confined Liquid To Achieve Tailored Adhesion Force with Repeated Contacts Revealed by Atomic Force Microscopy

Lai

Meng

2018

Langmuir

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The adhesion forces between two silica surfaces were measured by using an atomic force microscope with different experimental parameters in air to investigate the dynamic behavior of a confined liquid. Results show that the adhesion force is time-dependent and increases at first sharply and then slightly with dwell time until saturation is reached, with a long equilibrium time. This behavior is well explained by a dynamic meniscus model, in which a liquid bridge grows gradually because of liquid film flow with a large viscosity. Also, the large viscosity was attributed to the formation of orthosilicic acid and subsequent polymerization. With repeated contacts, the liquid bridge changes into two droplets on both surfaces after separation. The liquid in both forms can be controlled to flow into or out of the contact zone by the experimental parameters to achieve tailored adhesion forces. If the liquid of previous contact remains in the contact zone, the adhesion force increases with repeated contacts and then reaches saturation, which can also be explained by the model qualitatively. However, if the liquid droplets vanish before the next contact, the adhesion force usually decreases or remains unchanged. More liquid will be collected with larger contact times. Meanwhile, the droplets remaining on the surfaces get smaller until they vanish without a contact. Moreover, both piezo velocity and scan distance can be used to control the proportion of contact time. In addition, a viscous force should be considered with a large retraction velocity. The changing trend and magnitude of adhesion force depend on the experimental parameters and their coupling effects. The results may facilitate the anti-adhesion design of small-scale silicon-based systems.

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Wang-Landau Monte Carlo simulation of capillary forces at low relative humidity in atomic force microscopy

Cited by 14 publications

References 44 publications

Atomic Force Microscopy and Infrared Nanospectroscopy of COVID-19 Spike Protein for the Quantification of Adhesion to Common Surfaces

Atomic Force Microscopy and Infrared Nanospectroscopy of COVID-19 Spike Protein for the Quantification of Adhesion to Common Surfaces

Different Evolution Behaviors of Adhesion Force with Relative Humidity at Silica/Silica and Silica/Graphene Interfaces Studied using Atomic Force Microscopy

Time-Dependent Dynamic Behaviors of a Confined Liquid To Achieve Tailored Adhesion Force with Repeated Contacts Revealed by Atomic Force Microscopy

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