Particle Segregation at Contact Lines of Evaporating Colloidal Drops: Influence of the Substrate Wettability and Particle Charge–Mass Ratio

Noguera-Marín, Diego; Moraila-Martínez, Carmen L.; Cabrerizo-Vílchez, Miguel A.; Rodríguez-Valverde, Miguel A.

doi:10.1021/acs.langmuir.5b01062

Cited by 11 publications

(11 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coffee‐ring effect is manifested in systems with diverse constituents (ranging from large colloids to nanoparticles), and can be exploited to construct many interesting patterns from various functional materials. [ 35,41 – 43,110–117 ] Gu et al used the above effect to produce self‐assembled circular‐structure colored contact lenses on a hydrophilic template ( Figure a). [ 39 ] The as‐prepared lenses displayed variable colors under light illumination, preventing the potential harm that can be inflicted on the eyes due to wearing traditional colored contact lenses.…”

Section: Colloidal Assembly On Substrates With Distinct Wettabilitymentioning

confidence: 99%

“…This non‐lithographic approach could create patterned microstructures in a simple and cost‐effective manner. The coffee‐ring effect was used in many interesting applications such as particle separation [ 114–116 ] and disease diagnostics. [ 117 ] Ho's group [ 115 ] elucidated the physics of coffee‐ring effect‐driven particle separation (Figure 4f) by observing droplet vaporization on a pre‐cleaned cover glass.…”

Section: Colloidal Assembly On Substrates With Distinct Wettabilitymentioning

confidence: 99%

See 1 more Smart Citation

Functional Colloidal Assemblies Based on Superwettable Substrates

Zhang

Wang

Jiang

2021

Part & Part Syst Charact

View full text Add to dashboard Cite

Colloidal assembly, which finds numerous applications in functional optics, sensing materials, and other fields, is significantly affected by substrate wettability. In particular, the pinning or sliding of the three‐phase contact line (TCL) strongly influences the assembly process and the resultant functional structures. The present review focuses on this influence and provides a reference for effective colloidal assembly guidance to facilitate the related practical applications, covering the continuous and high‐quality colloidal crystals (CCs) fabricated using superhydrophilic substrates, coffee‐ring‐like assemblies produced using hydrophilic substrates, crack‐free and ultranarrow stopband CCs produced using low‐adhesive superhydrophobic substrates, dome‐like aggregates with excellent wide‐view properties obtained using hydrophobic substrates, and multi‐functional patterns assembled using substrates with hydrophilic‐hydrophobic patterns.

show abstract

Section: Colloidal Assembly On Substrates With Distinct Wettabilitymentioning

confidence: 99%

Section: Colloidal Assembly On Substrates With Distinct Wettabilitymentioning

confidence: 99%

Functional Colloidal Assemblies Based on Superwettable Substrates

Zhang

Wang

Jiang

2021

Part & Part Syst Charact

View full text Add to dashboard Cite

show abstract

“…Recently, Noguera-Marín et al studied the segregation and discrimination of charged particles with different densities during solvent evaporation. Changing substrate wettability and particle charge-mass ratios in low-ionic-strength solutions influenced the segregation of binary colloidal suspensions . The highly negatively charged particles were observed to transport and deposit in the vicinity of the contact line at a faster pace than those with less particle charge density.…”

Section: Introductionmentioning

confidence: 98%

Probing the Colloidal Particle Dynamics in Drying Sessile Droplets

Al‐Milaji

Zhao

2019

Langmuir

View full text Add to dashboard Cite

Particle deposition and assembly in the vicinity of contact lines of evaporative sessile droplets have been intensively investigated during the past decade. Yet little is known about particle arrangement in the contact-line region initiated by the self-assembled particles at the air−liquid interface and how the particle pinning behaves differently compared with that when particles are transported from the bulk of the sessile droplet to the three-phase contact line. We utilized the dual-droplet inkjet printing process to elucidate the versatility in particle deposition and assembly generated near the contact-line region and demonstrated the influence of such printing technique on particle pinning at the contact line after solvent evaporation. Wetting droplets containing sulfatefunctionalized polystyrene (sulfate-PS) nanoparticles were jetted over the supporting droplets with carboxyl-PS nanoparticles, where the interplay between the solvent evaporation and particle transport dictates the final morphology of particle deposition. Depending on the particle size and concentration used in the supporting droplet, different morphologies of particle depositions near the periphery of the supporting droplet have been obtained such as stratified rings, blended rings, and rings of particles mainly from the air−liquid interface. Three characteristic times are considered in this study, namely, total time for solvent evaporation (t evp ), time required for the colloidal particles in the supporting droplet to reach the contact line and form the first layers of deposition (t ps ), and time needed for the particles at the interface to reach the contact line (t pw ). The ratios of characteristic times (t ps /t evp ) and (t ps /t pw ) determine the final particle assembly near the contact-line region. The ability to control such particle deposition and assembly could have a direct implication on developing facile, cost-effective technologies essential for patterning heterogeneous structured coatings and devices.

show abstract

“…Further investigation showed that this mechanism was also dependent on the charge-mass ratio of the particles. 17 Segregation between particles was observed due to greater charge-mass ratios resulting in stronger resistance to sedimentation. Anyfantakis et al 18 also attempted to suppress the coffee-ring effect via particle interactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Interactions on the Assembly of Drying Colloidal Mixtures

et al. 2022

View full text Add to dashboard Cite

The effects of particle interactions on the size segregation and assembly of colloidal mixtures during drying were investigated. A cationic surfactant was added to a binary latex/silica colloidal dispersion that has been shown to self-stratify upon drying at room temperature. Atomic force microscopy was used to show that the change in particle interactions due to the presence of surfactants reduced the degree of stratification and, in some cases, suppressed the effect altogether. Colloidal dispersions containing higher surfactant concentrations can undergo a complete morphology change, resulting instead in the formation of armored particles consisting of latex particles coated with smaller silica nanoparticles. To further prove that armored particles are produced and that stratification is suppressed, cross-sectional images were produced with energy-dispersive X-ray spectroscopy and confocal fluorescence microscopy. The growth of armored particles was also measured using dynamic light scattering. To complement this research, Brownian dynamics simulations were used to model the drying. By tuning the particle interactions to make them more attractive, the simulations showed the presence of armored particles, and the size segregation process was hindered. The prevention of segregation also results in enhanced transparency of the colloidal films. Overall, this research proves that there is a link between particle interactions and size segregation in drying colloidal blends and provides a valuable tool to control the assembly of different film architectures using an extremely simple method.

show abstract

Particle Segregation at Contact Lines of Evaporating Colloidal Drops: Influence of the Substrate Wettability and Particle Charge–Mass Ratio

Cited by 11 publications

References 32 publications

Functional Colloidal Assemblies Based on Superwettable Substrates

Functional Colloidal Assemblies Based on Superwettable Substrates

Probing the Colloidal Particle Dynamics in Drying Sessile Droplets

Effect of Particle Interactions on the Assembly of Drying Colloidal Mixtures

Contact Info

Product

Resources

About