Enhanced Adhesion of Mosquitoes to Rough Surfaces

Pashazanusi, Leila; Lwoya, Baraka; Oak, Shreyas; Khosla, Tushar; Albert, Julie N. L.; Tian, Yu; Bansal, Gulshan; Kumar, Naveen; Pesika, Noshir S.

doi:10.1021/acsami.7b06659

Cited by 19 publications

(20 citation statements)

References 35 publications

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“…The study of molecular interactions between surfaces and colloids has been of great interest (Hugel and Seitz, 2001;Israelachvili, 2011;Balzer et al, 2013;Pashazanusi et al, 2017a) for several decades. A significant number of studies have been conducted aiming to better understand the tribological behavior of interfaces at the molecular scale (Mo et al, 2009;Schirmeisen and Schwarz, 2009;Balzer et al, 2013;Pérez, 2014;Weymouth et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Role of Interfacial Water and Applied Potential on Friction at Au(111) Surfaces

Pashazanusi

Kristiansen

et al. 2019

Front. Mech. Eng.

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The tribological properties between an AFM tip and a Au(111) surface in an aqueous environment is influenced by an applied electrical potential. Using lateral force microscopy, we measure the resulting friction force, while simultaneously applying a predetermined electrical potential on the Au surface via a three-electrode setup. Applying a positive potential to the Au surface forms an interfacial water layer at the Au/electrolyte interface, which sharply increases friction. However, when an anodic potential is applied, lower friction forces are measured. The potential dependent friction is observed on ultra-smooth gold surfaces as well as Au surfaces with larger roughness. An increase in the ionic strength of the electrolyte is found to lower friction. The use of an aqueous NaOH solution is found to lower the critical potential at which the friction sharply increases. Normal force curves are also measured as a function of approach velocity. The normal force linearly increases as the approach velocity increases in agreement with a drainage model. These results provide valuable insight into the effect of applied electrical potentials on the properties of water at charged surfaces and can potentially impact a wide range of fields including tribology, micro-electro-mechanical systems (MEMS), energy storage devices, fuel cells, and catalysis.

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Section: Introductionmentioning

confidence: 99%

Role of Interfacial Water and Applied Potential on Friction at Au(111) Surfaces

Pashazanusi

Kristiansen

et al. 2019

Front. Mech. Eng.

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“…Over the past few years, significant progress has been made to unravel the interaction mechanism involved in the water-based bitumen extraction process. − Nanomechanical tools such as surface forces apparatus (SFA) and atomic force microscope (AFM) have been widely used to quantitatively measure the interaction forces of solid surfaces. − Quantitative force measurements involving bitumen and asphaltenes (an interface-active component of bitumen) showed that the measured forces were dependent on aqueous conditions (e.g., pH, salinity, and salts), organic solvent, and temperature. ,,, Nevertheless, direct measurement of surface forces between air bubbles and bitumen surfaces at the nanoscale with theoretical analysis of the associated thin film drainage process have not been reported, probably due to the practical difficulties with precise manipulation of deformable bubbles and interpretation of the measured results. − …”

Section: Introductionmentioning

confidence: 99%

Probing the Interaction Mechanism between Air Bubbles and Bitumen Surfaces in Aqueous Media Using Bubble Probe Atomic Force Microscopy

et al. 2017

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Surface interactions involving deformable air bubbles have attracted tremendous interest in a wide range of engineering applications, such as mineral flotation and bitumen extraction. In this work, for the first time, the interaction forces between air bubbles and bitumen surfaces in complex aqueous media of varying pH, salinity, and salts were directly measured using a bubble probe atomic force microscope (AFM) technique. The AFM topographic imaging reveals that bitumen surface tends to be rougher and form distinct domains at high NaCl concentration or under strongly alkaline environment. The force measurements demonstrate the critical role of ionic strength and solution pH in bubble-bitumen interaction and attachment, which could be well described by a theoretical model based on Reynolds lubrication theory and augmented Young-Laplace equation by including the effect of disjoining pressure. In 1 mM NaCl, the electrical double layer (EDL) repulsion inhibited bubble-bitumen attachment, and such a repulsive effect could be further strengthened with increasing solution pH. In 500 mM NaCl, the hydrophobic attraction could lead to bubble-bitumen attachment, while a high solution pH could weaken the hydrophobic interaction. The addition of calcium ion in 500 mM NaCl could enhance the hydrophobic interaction and facilitate the bubble-bitumen attachment, most likely attributed to the bridging effect between calcium ions and the functional groups (e.g., carboxyl group) of interface-active molecules on bitumen surfaces, thus leading to higher surface roughness and hydrophobic moieties/aggregates on bitumen as confirmed by AFM imaging. Our results provide quantitative information on the interaction mechanism between air bubbles and bitumen surfaces in complex aqueous solutions at the nanoscale, which has useful implications to many related interfacial interactions in industrial processes such as oil production, oil-water separation, and wastewater treatment.

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“… 13 − 15 Thus, the NSCA is usually lower (at maximum equal) than the contact observed at lower resolution. 16 − 18 In conclusion, direct observation of NSCA is only possible with imaging techniques having a resolution in the length scale of the interaction forces, i.e., around 1 nm. Nevertheless, optical microscopy is sometimes used to estimate the contact between materials with low roughness.…”

Section: Introductionmentioning

confidence: 93%

Quantification and Imaging of Nanoscale Contact with Förster Resonance Energy Transfer

Simões

Urstöger

Schennach

et al. 2021

ACS Appl. Mater. Interfaces

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Adhesion is caused by molecular interactions that only take place if the surfaces are in nanoscale contact (NSC); i.e., the distance between the surfaces is in the range of 0.1–0.4 nm. However, there are several difficulties measuring the NSC between surfaces, mainly because regions that appear to be in full contact at low magnification may show no NSC when observed at higher magnifications. Thus, the measurement area of NSC is very small with imaging techniques, and an experimental technique to evaluate NSC for large contact areas has not been available thus far. Here, we are proposing Förster resonance energy transfer (FRET) spectroscopy/microscopy for this purpose. We demonstrate that NSC in a distance range of 1–10 nm can be evaluated. Our experiments reveal that, for thin films pressed under different loads, NSC increases with the applied pressure, resulting in a higher FRET signal and a corresponding increase in adhesion force/energy when separating the films. Furthermore, we show that local variations in molecular contact can be visualized with FRET microscopy. Thus, we are introducing a spectroscopic technique for quantification (FRET spectroscopy) and imaging (FRET microscopy) of NSC between surfaces, demonstrated here for the application of surface adhesion. This could be of interest for all fields where adhesion or nanoscale surface contact are playing a role, for example, soft matter, biological materials, and polymers, but also engineering applications, like tribology, adhesives, and sealants.

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Enhanced Adhesion of Mosquitoes to Rough Surfaces

Cited by 19 publications

References 35 publications

Role of Interfacial Water and Applied Potential on Friction at Au(111) Surfaces

Role of Interfacial Water and Applied Potential on Friction at Au(111) Surfaces

Probing the Interaction Mechanism between Air Bubbles and Bitumen Surfaces in Aqueous Media Using Bubble Probe Atomic Force Microscopy

Quantification and Imaging of Nanoscale Contact with Förster Resonance Energy Transfer

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