Applying droplets and films in evaporative lithography

Kolegov, K. S.; Barash, L. Yu.

doi:10.1016/j.cis.2020.102271

Cited by 48 publications

(35 citation statements)

References 240 publications

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“…One of the approaches to the design of such materials is based on the deposition of 2D and 3D structures, and planar patterns, on the surfaces of interest using nanoand microparticles of arbitrary shapes, having specific physical, chemical, and biological properties. For the implementation of that approach, the technology referred to as the evaporative-induced self-assembly is utilized [1]. This includes the interaction between the physical mechanisms arising in the course of the spontaneous evaporation of droplets, films and meniscus of colloidal solutions, upon various external (pre-defined) passive factors, and external forces' impacts on that system in combination with the evaporation process.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ring-Shaped Deposits of Polystyrene Microparticles Driven by Thermocapillary Mechanism

2021

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Fabrication of ring-shaped deposits of microparticles on solid surfaces with the desired length scales and morphology of particle arrangements is of great importance when developing modern optical and electronic resonators, chemical sensors, touch screens, field-emission displays, porous materials, and coatings with various functional properties. However, the controlled formation of ring-shaped patterns scaling from a few millimeters up to centimeters with simultaneous control of particle arrangement at the microscale is one of the most challenging problems in advanced materials science and technology. Here, we report a fabrication approach for ring-shaped structures of microparticles on a glass surface that relied on a local thermal impact produced by the subsurface heater and heat sink. Thermocapillary convection in the liquid covering microparticles in combination with evaporative lithography is responsible for the particle transport and the assembling into the ring-shaped patterns. An advantageous feature of this approach is based on the control of thermocapillary flow direction, achieved by changing the sign of the temperature gradient in the liquid, switching between heating and cooling modes. That allows for changing the particle transfer direction to create the ring-shaped deposits and dynamically tune their size and density distribution. We have studied the influence of the power applied to the heat source/sink and the duration of the applied thermal field on the rate of the ring fabrication, the sizes of the ring and the profile of the particle distribution in the ring. The proposed method is flexible to control simultaneously the centimeter scale and microscale processes of transfer and arrangements of particles and can be applied to the fabrication of ring structures of particles of different nature and shape.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Ring-Shaped Deposits of Polystyrene Microparticles Driven by Thermocapillary Mechanism

2021

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“…To understand physical mechanisms of pattern formation in the process of sessile droplet drying is a fundamental task of crucial importance in various applications including biosensors, labs-on-chip, functional coatings, optoelectronics, biomedical applications, inkjet printing and many others [1,2]. Although issues of spatial structuring of deposition patterns from drying sessile drops have been extensively studied and the role of many effects has been clarified [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], no comprehensive analysis of pattern formation has been done so far, so evaporation of a droplet remains a complex phenomenon and there are a lot of questions that are unanswered yet. A prime example of such a controversial issue is the role of particle-particle, particle-substrate and particle-liquid-gas interface interactions in the presence of charged particles and counterions that are caused by electrolytic dissociation.…”

Section: Introductionmentioning

confidence: 99%

“…We consider two types of naturally occurring liquid flows in a droplet: a thermocapillary convective Marangoni flow, which appears due to the temperature dependence of liquid surface tension [37,38], and a capillary outward flow (aka compensatory flow) that originates from a nonuniform evaporation profile along the droplet surface and is known to result in a coffee-ring effect [39,40]. The thermocapillary convection usually dominates the capillary flow at comparatively large contact angles, 𝜃, while the latter becomes dominating only at the final stage of droplet evaporation, which means that the flows are weak at sufficiently small 𝜃 [2]. Our basic result is that a strong fluid flow such as the naturally occurring Marangoni convective flow, destroys the electric double layer.…”

Section: Introductionmentioning

confidence: 99%

Influence of fluid flows on electric double layers in evaporating colloidal sessile droplets

Zavarzin,

Kolesnikov,

Budkov

et al. 2021

Preprint

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A model is developed for describing transport of colloidal silica particles in an evaporating aqueous sessile droplet on the electrified metal substrate in the presence of a solvent flow. The model takes into account the electric charge of colloidal particles and small ions produced by electrolytic dissociation of the active groups on the colloidal particles and water molecules. We employ a system of self-consistent Poisson and Nernst-Planck equations for electric potential and average concentrations of colloidal particles and ions with the respective boundary conditions. The developed model is used to make a first-principles numerical simulation of charged colloidal particle transport. We find that electric double layers can be destroyed by a sufficiently strong fluid flow such as Marangoni flow. Capillary fluid flows cannot destroy the electric double layer because they are much weaker than Marangoni flows.

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“…In some applications, solutions containing mixtures of particles of different sizes are of interest. As an example, we will mention only some applications: evaporative lithography [1][2][3][4] , diagnostics in medicine 5 , development of biosensors 6 , formation of supraparticles [7][8][9][10] and nanocomposites 11 , creation of photonic crystals 7,12,13 , production of color filters for displays 14 , nanosphere lithography [15][16][17][18] and inkjet printing 19 . Mixtures of particles are also used in other technologies for the formation of structures that are not associated with evaporation, for example, the Langmuir-Blodgett method 20,21 , spin-coating 22 , transfer of a particle monolayer from the liquid-air interface onto an inclined substrate in the process of liquid discharge from a glass container with a tap 23 , etc.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation of particle size separation in evaporating bi-dispersed colloidal droplets on hydrophilic substrates

Zolotarev,

Kolegov

2021

Preprint

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Colloidal droplets are used in a variety of practical applications. Some applications require particles of different sizes. These include medical diagnostic methods, the creation of photonic crystals, the formation of supraparticles, and the production of membranes for biotechnology. Series of experiments have previously shown the possibility of particle separation by their size near the contact line. A mathematical model has been developed to describe this process. Bidispersed colloidal droplets evaporating on a hydrophilic substrate are taken into consideration. A particle monolayer is formed due to the small value of the contact angle near the periphery of such droplets. The shape of the resulting sediment is associated with the coffee ring effect. The model takes into account the particle diffusion and transfer with a capillary flow caused by liquid evaporation. Monte Carlo simulation of particle dynamics has been performed at several values of the solution concentration. The numerical results agree with the experimental observations, in which small particles accumulate closer toward the contact line than large particles.

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Applying droplets and films in evaporative lithography

Cited by 48 publications

References 240 publications

Fabrication of Ring-Shaped Deposits of Polystyrene Microparticles Driven by Thermocapillary Mechanism

Fabrication of Ring-Shaped Deposits of Polystyrene Microparticles Driven by Thermocapillary Mechanism

Influence of fluid flows on electric double layers in evaporating colloidal sessile droplets

Monte Carlo simulation of particle size separation in evaporating bi-dispersed colloidal droplets on hydrophilic substrates

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