The effect of particle wettability on the stick-slip motion of the contact line

Kim, Dong-Ook; Pack, Min; Rokoni, Arif; Kaneelil, Paul; Sun, Ying

doi:10.1039/c8sm02129e

Cited by 21 publications

(26 citation statements)

References 47 publications

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“…Such nonadhered crystals may move with the contact line as it recedes. Such an effect has also been observed in experiments for colloidal solutions as a function of the particle surface tension …”

Section: Discussionsupporting

confidence: 58%

“…Such an effect has also been observed in experiments for colloidal solutions as a function of the particle surface tension. 24 We have seen that crystalline patterns differ from colloidal patterns deposited from an evaporating drop under the same conditions and have demonstrated that area localization is correlated with the supersaturation (and therefore the nucleation barrier) at which crystals begin to form. We now briefly consider the hypothesis that saline-induced convection, which has been previously shown to strongly alter the interior flow of the drop, 29,30,37 influences these results.…”

Section: ■ Discussionmentioning

confidence: 88%

“…17 The emergence of one deposit morphology over another is due to the competing interactions of evaporative flow, forces between the particles and substrate, and Marangoni recirculation. 3,16,17,24 Despite the abundance of work exploring the evaporative self-assembly of colloids from drops, less is known regarding crystallizing solutes. In crystalline evaporative deposition, a drop containing a mixture of a solvent (usually water) and a nonvolatile solute is evaporated on a substrate.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The deposits are typically categorized as rings, uniform deposits, or bumps . The emergence of one deposit morphology over another is due to the competing interactions of evaporative flow, forces between the particles and substrate, and Marangoni recirculation. ,,, …”

Section: Introductionmentioning

confidence: 99%

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Differences between Colloidal and Crystalline Evaporative Deposits

McBride

Skye

2020

Langmuir

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Evaporative deposits from drops are widely studied due to their numerous applications in low-effort self-assembly, including for inkjet printing, microscale separations, and sensing/diagnostics. This phenomenon has been broadly explored for drops containing suspended colloidal particles but has been less quantified for drops with dissolved solutes. When a drop of solute/solvent mixture is evaporated on a substrate, nonvolatile solutes become supersaturated as the solvent evaporates, which then leads to crystal nucleation at the substrate-drop contact line. Emerging crystals alter the local wettability and fundamentally alter the dynamics of evaporation, which, in turn, influences the resultant evaporative deposit. Here we investigate the role of interactions between the substrate, crystals, and solution by comparing the evaporative deposition of three different salts as solutes against an evaporating colloidal solution. We show that nucleation effects can cause crystalline deposits to have a temperature relationship that is opposite to that of colloidal deposits and demonstrate how a balance between the contact-line pinning force and nucleation controls the deposit size.

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Section: Discussionsupporting

confidence: 58%

Section: ■ Discussionmentioning

confidence: 88%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Differences between Colloidal and Crystalline Evaporative Deposits

McBride

Skye

2020

Langmuir

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“…Multiring pattern has been explained in previous works to be the result of stick‐slip motion of the contact line. [ 49 − 51 ] The broader and thicker ring at the outer edge could be attributed to convection flow towards the droplet contact line in order to replace the evaporated liquid at the border and consequently deposition of more solute dyes in that region. Such migration is accelerated with the influence of well‐known Marangoni flow inside the droplet, [ 52 ] specifically with the presence of poly(vinyl alcohol) (PVA) in this study acting as a surfactant.…”

Section: Resultsmentioning

confidence: 99%

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

Ghaeli

Adão

Nieder

2020

Adv Materials Inter

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Surface nanostructures include thin/ ultrathin films, whose precise characterization is important in semiconductors, optical components, and wear-resistance coatings. Also, surface-assembled and densely packed nanoparticle clusters such as viruses, [4,5] colloidal molecules, [6] DNA, [7] and supramolecules [8] form extended complex surface nanostructures which could be used to explore new paradigms in nanobiotechnology. Analyzing the surface bio-nanotopography could open new possibilities of bio-inspired system engineering. [9] In biology, the nanotopographical measurement scaled down to a single-molecule level eventually leads to the nanodisplaying of compartments in densely packed biological environments. Thus, depicting the morphology of macromolecular structures with high spatial and genomic resolution is expected to reveal the complex biological structures and underlying molecular mechanisms. [10] Various microscale characterization techniques enable the study of physicochemical properties of microstructures, such as scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDAX), and Raman spectroscopy. Surface micro-and submicro topographies can be measured by a wide range of optical instruments such as phase shifting interferometry and coherence scanning interferometry (CSI), point autofocus instrument (PAI), focus variation microscopy (FVM), and imaging confocal microscopy (ICM). [11,12] However, such techniques and particularly the commercial interferometric ones are incapable of precise measurement when it comes to irregular topographies of materials with complex optical properties and nanometer resolution. [13] The advent of nanoscopic scale techniques such as scanning tunneling microscopy (STM), atomic force microscopy (AFM), and scanning probe microscopies (SPM) initiates an important step to surface micro-/nanomorphological characterization. [14,15] Nonetheless, AFM and the contact profilometer are the only promising techniques for exact surface topography quantification. These are inclusively used to assess the behavior of optical measurement techniques, but they are very time-consuming and surface-intrusive. [11] Quantifying the micro-/nanotopography of thin films, surface nanostructures and nano-bio behavior at liquid/solid interfaces A nearfield-based topographic imaging method is presented to obtain 3D micro-/nanotopography in labelled structures over lateral ranges of hundreds of micrometers with an axial thickness from 1000 nm to thin layers of below 100 nm. The contactless axial nearfield-based fluorescence imaging topography (CLeANFIT) nanometrology technique is based on a modified model used in nearfield-based super-resolution imaging and sensing. The modified approach allows converting fluorescence lifetimes into nanoscale thicknesses of a fluorescent material in the nearfield of a metal surface. CLeANFIT is used to characterize the drying process of a fluorophore-doped poly(vinyl alcohol)/water droplet and it allows to quantify the nanomorphological patterns formed during an...

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Nanoparticle Assembly: From Self‐Organization to Controlled Micropatterning for Enhanced Functionalities

Jambhulkar,

Ravichandran,

Zhu

et al. 2023

Small

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Nanoparticles form long‐range micropatterns via self‐assembly or directed self‐assembly with superior mechanical, electrical, optical, magnetic, chemical, and other functional properties for broad applications, such as structural supports, thermal exchangers, optoelectronics, microelectronics, and robotics. The precisely defined particle assembly at the nanoscale with simultaneously scalable patterning at the microscale is indispensable for enabling functionality and improving the performance of devices. This article provides a comprehensive review of nanoparticle assembly formed primarily via the balance of forces at the nanoscale (e.g., van der Waals, colloidal, capillary, convection, and chemical forces) and nanoparticle‐template interactions (e.g., physical confinement, chemical functionalization, additive layer‐upon‐layer). The review commences with a general overview of nanoparticle self‐assembly, with the state‐of‐the‐art literature review and motivation. It subsequently reviews the recent progress in nanoparticle assembly without the presence of surface templates. Manufacturing techniques for surface template fabrication and their influence on nanoparticle assembly efficiency and effectiveness are then explored. The primary focus is the spatial organization and orientational preference of nanoparticles on non‐templated and pre‐templated surfaces in a controlled manner. Moreover, the article discusses broad applications of micropatterned surfaces, encompassing various fields. Finally, the review concludes with a summary of manufacturing methods, their limitations, and future trends in nanoparticle assembly.

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The effect of particle wettability on the stick-slip motion of the contact line

Abstract: Contact line dynamics and deposition pattern of a colloidal drop are strong functions of the particle wettability.

Cited by 21 publications

References 47 publications

Differences between Colloidal and Crystalline Evaporative Deposits

Differences between Colloidal and Crystalline Evaporative Deposits

CLeANFIT – Contact‐Less Axial Nearfield‐Based Fluorescence Imaging Topography: A Method for 3D Micro‐ and Nanotopography Characterization

Nanoparticle Assembly: From Self‐Organization to Controlled Micropatterning for Enhanced Functionalities

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