Dynamically controlled deposition of colloidal nanoparticle suspension in evaporating drops using laser radiation

Ta, Van Duong; Carter, Richard M.; Esentürk, Emre; Connaughton, Colm; Wasley, TJ; Li, J; Kay, RW; Stringer, Jonathan; Smith, PJ; Shephard, Jonathan D.

doi:10.1039/c6sm00465b

Cited by 36 publications

(50 citation statements)

References 37 publications

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“…The droplet surface can be locally heated using a laser beam to generate radially inward flow [94]. In this study, an infra-red laser of wavelength 2.9 l m (as water has strong absorption at this range) was irradiated at the liquid-air interface of the droplet (Fig.…”

Section: Marangoni Flowmentioning

confidence: 99%

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A review on suppression and utilization of the coffee-ring effect

Mampallil

Eral

2018

Advances in Colloid and Interface Science

491

388

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Evaporation of sessile droplets containing non-volatile solutes dispersed in a volatile solvent leaves behind ring-like solid stains. As the volatile species evaporates, pinning of the contact line gives rise to capillary flows that transport non-volatile solutes to the contact line. This phenomenon, called the coffee-ring effect, compromises the overall performance of industrially relevant manufacturing processes involving evaporation such as printing, biochemical analysis, manufacturing of nano-structured materials through colloidal and macromolecular patterning. Various approaches have been developed to suppress this phenomenon, which is otherwise difficult to avoid. The coffee-ring effect has also been leveraged to prepare new materials through convection induced assembly. This review underlines not only the strategies developed to suppress the coffee-ring effect but also sheds light on approaches to arrive at novel processes and materials. Working principles and applicability of these strategies are discussed together with a critical comparison.

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Section: Marangoni Flowmentioning

confidence: 99%

“…The residue morphology can be varied from uniform disc to spot-like deposition either by increasing the exposure time or decreasing the ratio between the laser spot size and the droplet diameter (Fig. 5c, d) [94].…”

Section: Marangoni Flowmentioning

confidence: 99%

A review on suppression and utilization of the coffee-ring effect

Mampallil

Eral

2018

Advances in Colloid and Interface Science

491

388

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“…Once these initial conditions are set, there is little real-time control over the emergence and generation of the flows within the droplet, and thus on the final deposit of the material in it. Only very recently, a degree of local control over Marangoni flows has been demonstrated using laser radiation alone 26 or in combination with light-activated surfactants. 27 Here, we propose a novel mechanism to generate and control Marangoni flows within an evaporating sessile droplet in a deterministic and dynamic way.…”

Section: Toc Entry Requiredmentioning

confidence: 99%

Dynamic Control of Particle Deposition in Evaporating Droplets by an External Point Source of Vapor

Malinowski

Volpe

Parkin

et al. 2018

J. Phys. Chem. Lett.

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The deposition of particles on a surface by an evaporating sessile droplet is important for phenomena as diverse as printing, thin-film deposition, and self-assembly. The shape of the final deposit depends on the flows within the droplet during evaporation. These flows are typically determined at the onset of the process by the intrinsic physical, chemical, and geometrical properties of the droplet and its environment. Here, we demonstrate deterministic emergence and real-time control of Marangoni flows within the evaporating droplet by an external point source of vapor. By varying the source location, we can modulate these flows in space and time to pattern colloids on surfaces in a controllable manner.

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“…Figure 18 shows several resulting patterns corresponding to different needle motion types. Two years earlier, other researches achieved a similar result due to the displacement of a substrate with droplet relative to a fixed laser emitter [176] (figure 19). The locally heated (d) a laser beam is projected near periphery; (e) a laser beam is projected first in point 1 and then, over some time, in point 2; (f) the substrate was moved relatively to the laser beam with a constant speed of 0.12 mm/s.…”

Section: Active Methods For Controlling Particle Sedimentationmentioning

confidence: 65%

“…Polystyrene particles of about 0.5 µm in size were used. The authors [176] measured the dependence of the evaporation time of droplets on the radiation power density (53-224 W/cm 2 ) for droplets of 2 to 10 µL. The size of the formed deposits was also measured as a function of the beam diameter.…”

Section: Active Methods For Controlling Particle Sedimentationmentioning

confidence: 99%

Applying Droplets and Films in Evaporative Lithography

Kolegov,

Barash

2020

Preprint

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The review covers experimental results of evaporative lithography and analyzes existing mathematical models of this method. Evaporating droplets and films are applied in different fields, such as cooling of heated surfaces of electronic devices, diagnostics in health care, creation of transparent conductive coatings on flexible substrates, surface patterning. A method called evaporative lithography emerged after establishing the connection between the coffee ring effect taking place in drying colloidal droplets, and naturally occuring inhomogeneous vapor flow densities from fluid-vapor interfaces. Essential control of the colloidal particle deposit patterns is achieved in this method by producing ambient conditions that induce a nonuniform evaporation profile from the colloidal liquid surface. Evaporative lithography is part of a wider field, which is known as "Evaporative-induced self-assembly" (EISA). EISA involves methods based on the contact line processes, methods employing particle interaction effects and evaporative lithography. As a rule, evaporative lithography is a flexible and single-stage process with such advantages as simplicity, low price and possibility of application to almost any substrate without pretreatment. Since no mechanical impact on a template is present in evaporative lithography, the template integrity is preserved in the process. The method is also useful for creating materials with localized functions, such as slipperiness and self-healing. For these reasons, evaporative lithography attracts increasing attention and has a number of noticeable achievements at present. We also analyze limitations of the approach and ways of its further development.

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Dynamically controlled deposition of colloidal nanoparticle suspension in evaporating drops using laser radiation

Cited by 36 publications

References 37 publications

A review on suppression and utilization of the coffee-ring effect

A review on suppression and utilization of the coffee-ring effect

Dynamic Control of Particle Deposition in Evaporating Droplets by an External Point Source of Vapor

Applying Droplets and Films in Evaporative Lithography

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