Wetting Driven by Thermal Fluctuations on Terraced Nanostructures

Colosqui, Carlos E.; Teng, Teng; Rahmani, Amir M.

doi:10.1103/physrevlett.115.154504

Cited by 13 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Effects of particle size 21 and surface charge 22 on the global adsorption kinetics have been investigated. Using holographic microscopy Kaz et al monitored the adsorption of single particles and observed that the fast initial adsorption was followed by an intriguing and unexpectedly slow relaxation 23 , which was been attributed to surface defects and contact line pinning 24,25 . Boniello and coworkers showed that a particle straddling an air/water interface feels a large viscous drag that is unexpectedly larger than the one measured in the bulk.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Ellipsoidal Particles at Liquid–Liquid Interfaces

Coertjens

Dier²,

Moldenaers

et al. 2017

Langmuir

View full text Add to dashboard Cite

The adsorption of particles at liquid-liquid interfaces is of great scientific and technological importance. In particular for non-spherical particles, the capillary forces which drive adsorption vary with position and orientation and complex adsorption pathways have been predicted by simulations. Based on the latter it has been suggested that the time scales of adsorption are determined by a balance between capillary and viscous forces. However, several recent experimental results point out the role of contact line pinning in the adsorption of particles to interfaces, and even suggest that the adsorption dynamics and pathways are completely determined by the latter, with the timescales of adsorption being determined solely by particle characteristics. In the present work the adsorption trajectories of model ellipsoidal particles are investigated experimentally using cryo-SEM and monitoring the altitudinal orientation angle using high speed confocal microscopy. By varying the viscosity and the viscosity jump across the interfaces we specifically interrogate the role of viscous forces.

show abstract

Section: Introductionmentioning

confidence: 99%

Adsorption of Ellipsoidal Particles at Liquid–Liquid Interfaces

Coertjens

Dier²,

Moldenaers

et al. 2017

Langmuir

View full text Add to dashboard Cite

show abstract

“…where l and t are displacement distance and time, respectively. According to the Lucas-Washburn equation, imbibition dynamics is closely related to important factors of surface tension (γ), liquid viscosity (η), the contact angle of water on the capillary wall (θ) and the radius of the capillary (R) [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoparticles on Spontaneous Imbibition of Water into Ultraconfined Reservoir Capillary by Molecular Dynamics Simulation

et al. 2017

View full text Add to dashboard Cite

Imbibition is one of the key phenomena underlying processes such as oil recovery and others. In this paper, the influence of nanoparticles on spontaneous water imbibition into ultraconfined channels is investigated by molecular dynamics simulation. By combining the dynamic process of imbibition, the water contact angle in the capillary and the relationship of displacement (l) and time (t), a competitive mechanism of nanoparticle effects on spontaneous imbibition is proposed. The results indicate that the addition of nanoparticles decreases the displacement of fluids into the capillary dramatically, and the relationship between displacement and time can be described by l(t) t 1/2. Based on the analysis of the dynamic contact angle and motion behavior of nanoparticles, for water containing hydrophobic nanoparticles, the displacement decreases with the decrease of hydrophobicity, and the properties of fluids, such as viscosity and surface tension, play a major role. While for hydrophilic nanoparticles, the displacement of fluids increases slightly with the increase of hydrophilicity in the water-wet capillary and simulation time, which can be ascribed to disjoining pressure induced by "sticking nanoparticles". This study provides new insights into the complex interactions between nanoparticles and other components in nanofluids in the spontaneous imbibition, which is crucially important to enhanced oil recovery.

show abstract

“…The interplay between nanoscale surface defects and thermal fluctuations can induce the thermally activated displacement of the three-phase contact line, which results in nontrivial wetting processes. [26][27][28] arXiv:1604.06836v1 [cond-mat.soft] 23 Apr 2016…”

Section: Introductionmentioning

confidence: 99%

Colloidal particle adsorption at liquid interfaces: capillary driven dynamics and thermally activated kinetics

Rahmani¹,

Wang²,

Manoharan³

et al. 2016

Soft Matter

Self Cite

View full text Add to dashboard Cite

The adsorption of single colloidal microparticles (0.5-1 µm radius) at a water-oil interface has been recently studied experimentally using digital holographic microscopy [Kaz et al., Nat. Mater., 2012, 11, 138-142]. An initially fast adsorption dynamics driven by capillary forces is followed by an unexpectedly slow relaxation to equilibrium that is logarithmic in time and can span hours or days. The slow relaxation kinetics has been attributed to the presence of surface "defects" with nanoscale dimensions (1-5 nm) that induce multiple metastable configurations of the contact line perimeter. A kinetic model considering thermally activated transitions between such metastable configurations has been proposed [Colosqui et al., Phys. Rev. Lett., 2013, 111, 028302] to predict both the relaxation rate and the crossover point to the slow logarithmic regime. However, the adsorption dynamics observed experimentally before the crossover point has remained unstudied. In this work, we propose a Langevin model that is able to describe the entire adsorption process of single colloidal particles by considering metastable states produced by surface defects and thermal motion of the particle and liquid interface. Invoking the fluctuation dissipation theorem, we introduce a drag term that considers significant dissipative forces induced by thermal fluctuations of the liquid interface. Langevin dynamics simulations based on the proposed adsorption model yield close agreement with experimental observations for different microparticles, capturing the crossover from (fast) capillary driven dynamics to (slow) thermally activated kinetics.

show abstract

Wetting Driven by Thermal Fluctuations on Terraced Nanostructures

Cited by 13 publications

References 41 publications

Adsorption of Ellipsoidal Particles at Liquid–Liquid Interfaces

Adsorption of Ellipsoidal Particles at Liquid–Liquid Interfaces

Effect of Nanoparticles on Spontaneous Imbibition of Water into Ultraconfined Reservoir Capillary by Molecular Dynamics Simulation

Colloidal particle adsorption at liquid interfaces: capillary driven dynamics and thermally activated kinetics

Contact Info

Product

Resources

About