Wetting Properties at Nanometer Scale

Moldovan, A.; Enăchescu, Marius

doi:10.5772/60886

Cited by 5 publications

(4 citation statements)

References 53 publications

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“…The droplet-based protocol for relative wettability characterization has the potential to be applied for probing the effect of pH and ionic strength on microwettability of solid surfaces in liquids. Although much more challenging, it will be of great interest to further study the morphology of nanobubbles on two-dimensional substrates. − …”

Section: Discussionmentioning

confidence: 99%

Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets

Peng

et al. 2016

Langmuir

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Understanding the microwettability of anisotropic molybdenum disulfide crystal is critically important in separation and processing of this material in liquid. In this work, static microwetting properties of MoS face (MF) and MoS edge (ME) surfaces in water are revealed by the morphology of femtoliter interfacial droplets. The oil droplets with different size distribution were produced from heterogeneous nucleation and growth of nanodroplets during the solvent exchange under controlled flow and solution conditions, and were polymerized for droplet morphology characterization to reveal the relative wettability of the droplets on surfaces. We first demonstrate that the shape of the nanodroplets is responsive to the surface charges on a model pH sensitive substrate of gold coated with a self-assembled monolayer of two types of thiol. The experimental results on MoS substrates indicate that (1) oil contact angle of the droplets on ME surface is much larger than that on MF surface at pH 3.0, suggesting that the ME surface is more hydrophilic than MF; (2) the droplets are pinned by the layered nanostructure on MoS edge. The fundamental understanding of microwettability elucidated in this study may allow for an improved control of the interaction between anisotropic MoS surfaces and the surrounding liquid environment, which is critically important for many industrial applications such as flotation and catalysis systems.

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Section: Discussionmentioning

confidence: 99%

Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets

Peng

et al. 2016

Langmuir

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“…To validate the wettability change we measured the contact angle for oil droplets in water on a sandstone surface prior to and after OTS treatment (Moldovan & Enachescu, ). It is clear that OTS treatment renders the sandstone surface oil‐wet (see Table ).…”

Section: Methodsmentioning

confidence: 99%

Experimental and Theoretical Evidence for Increased Ganglion Dynamics During Fractional Flow in Mixed‐Wet Porous Media

Zou

Armstrong

Arns

et al. 2018

Water Resources Research

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X-ray microtomography (micro-CT) provides a nondestructive way for estimating rock properties such as relative permeability. Relative permeability is computed on the fluid distributions generated on three dimensional images of the pore structure of a rock. However, it is difficult to numerically reproduce actual fluid distributions at the pore scale, particularly for a mixed-wet rock. Recent advances in imaging technologies have made it possible to directly resolve a large field of view for arbitrary wetting conditions. Herein, the objective of this study is to evaluate relative permeability computations on imaged fluid distributions under water-wet and mixed-wet conditions. By simultaneously injecting oil and brine on a Bentheimer sandstone before and after wettability alteration, imaged fluid distributions are obtained under steady state conditions. Then relative permeability computations performed on imaged fluid distribution are compared with experimental data obtained on the same rock. We find that relative permeabilities computed directly from imaged fluid distributions show agreement with experimental data in water-wet rock while for mixed-wet rock, the imaged connected pathways provided a poor estimate of relative permeability. Analysis of imaged fluid distributions and connectivity demonstrates that under mixed-wet conditions, increased dynamic connectivity and ganglion dynamics result in non-equilibrium effects at the fluid-fluid interface. These effects result in more energy dissipation during fractional flow in mixed-wet systems and thus lower effective permeability than water-wet rock at the same saturation. Hussain et al. (2014) extended the work of Turner et al. (2004). They conducted steady-state tests on both a small scale (D 5 5mm, L 5 21mm) and a conventional scale sample (D 5 25mm, L 5 53mm) which are homogenous strongly water-wet cores. The image-based computations were compared with laboratory Key Points:Nonwetting phase is less connected under mixed-wet than water-wet conditions Dynamic connectivity is observed more frequently under mixed-wet conditions Energy balance demonstrates higher propensity for interface creation under mixed-wet conditions Supporting Information:Supporting Information S1 Data Set S1

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“…Since the contact angle is less than 90 ο , there is an increase in the hydrophilicity of IL-MoO3, what can influence the buffer solution. As a result, IL-MoO3 surface shows compatibility for immobilization of analyte [37]. Therefore, the surface wettability of IL-MoO3 is relevant for applications such as sensors and biosensors.…”

Section: Contact Angle Measurement Of Il-moo3mentioning

confidence: 99%

Determination of 4-nitrophenol using MoO3 loaded glassy carbon electrode via electrochemical sensing approach

Kamble

Garadkar

Sharma

et al. 2021

J. Electrochem. Sci. Eng.

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In order to raise possible ways of MoO3 synthesis and improve its existing applications, MoO3 nanomaterial was successfully synthesized through the solvo-hydrothermal route by utilizing a mixture of ionic liquid (1-butyl-3-methylimidazolium bromide) as a solvent, and water as co-solvent in 1:1 ratio. The morphology and structural parameters of IL-assisted MoO3 product were examined by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). Additionally, the surface wettability and particle size distribution were inspected using the contact angle and dynamic light scattering (DLS) analysis. Glassy carbon electrode (GCE) surface was then modified by IL-assisted MoO3. The formed IL-MoO3/GCE was employed as an electrochemical sensor for determination of 4-nitrophenol (4-NP), which is very toxic and important pollutant. The redox behavior of 4-NP at the surface of IL-MoO3/GCE was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Limits of detection (LOD) and limits of quantification (LOQ) determined from CV were found to be 6.76 and 22.5 mM, while from DPV recordings, 5.41 and 18.0 mM are found. The obtained results clearly reveal possible application of MoO3 for selective and sensitive sensing of 4-NP. The decorated electrode was successfully employed for determination of 4-NP in the river water real samples.

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Wetting Properties at Nanometer Scale

Cited by 5 publications

References 53 publications

Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets

Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets

Experimental and Theoretical Evidence for Increased Ganglion Dynamics During Fractional Flow in Mixed‐Wet Porous Media

Determination of 4-nitrophenol using MoO3 loaded glassy carbon electrode via electrochemical sensing approach

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Wetting Properties at Nanometer Scale

Cited by 5 publications

References 53 publications

Microwetting of pH-Sensitive Surface and Anisotropic MoS2 Surfaces Revealed by Femtoliter Sessile Droplets

Microwetting of pH-Sensitive Surface and Anisotropic MoS2 Surfaces Revealed by Femtoliter Sessile Droplets

Experimental and Theoretical Evidence for Increased Ganglion Dynamics During Fractional Flow in Mixed‐Wet Porous Media

Determination of 4-nitrophenol using MoO3 loaded glassy carbon electrode via electrochemical sensing approach

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Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets

Microwetting of pH-Sensitive Surface and Anisotropic MoS₂ Surfaces Revealed by Femtoliter Sessile Droplets