Surface-Guided Templating of Particle Assemblies Inside Drying Sessile Droplets

Kuncicky, Daniel M.; Velev, Orlin D.

doi:10.1021/la702129b

Cited by 102 publications

(128 citation statements)

References 56 publications

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“…S7). Such a shape is clear evidence of a single drying sessile ink droplet containing mobile nanoparticles 15 and illustrates the accumulation of several smaller droplets on the substrate due to insufficient vapourization rates.…”

Section: Working Principle and Set-upmentioning

confidence: 95%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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nanotechnology, with its broad impact on societally relevant applications, relies heavily on the availability of accessible nanofabrication methods. Even though a host of such techniques exists, the flexible, inexpensive, on-demand and scalable fabrication of functional nanostructures remains largely elusive. Here we present a method involving nanoscale electrohydrodynamic ink-jet printing that may significantly contribute in this direction. A combination of nanoscopic placement precision, soft-landing fluid dynamics, rapid solvent vapourization, and subsequent self-assembly of the ink colloidal content leads to the formation of scaffolds with base diameters equal to that of a single ejected nanodroplet. The virtually material-independent growth of nanostructures into the third dimension is then governed by an autofocussing phenomenon caused by local electrostatic field enhancement, resulting in large aspect ratio. We demonstrate the capabilities of our electrohydrodynamic printing technique with several examples, including the fabrication of plasmonic nanoantennas with features sizes down to 50 nm.

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Section: Working Principle and Set-upmentioning

confidence: 95%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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“…Spherical-cap-shaped colloidal crystals (i.e., nanoparticle clusters) have also been obtained after vaporization-induced volume shrinkage of much larger nanoparticle-laden sessile droplets (22). It is noteworthy, however, that in the present study the concentration increase takes place at an essentially constant volume (i.e., at isochoric conditions).…”

Section: Resultsmentioning

confidence: 56%

Open-atmosphere sustenance of highly volatile attoliter-size droplets on surfaces

Galliker

Schneider

Rüthemann

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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The controlled formation and handling of minute liquid volumes on surfaces is essential to the success of microfluidics in biology, chemistry, and materials applications. Even though current methods have demonstrated their potential in a variety of experimental assays, there remain significant difficulties concerning breadth of applicability, standardization, throughput, and economics. Here we introduce a unique microfluidic paradigm in which microscopic volatile droplets are formed, sustained, and manipulated in size and content at any desired spot on unpatterned substrates. Their sustainability is warranted by continuous replacement of the rapidly vaporizing sessile fluid through controlled equivalent volume deposition of smaller discrete liquid entities by an electrohydrodynamic nanodripping process. Using nanoparticle inks we show that the concentration of solutes in so-stabilized droplets can be linearly increased at isochoric conditions and user-defined rates. An intriguing insensitivity of the droplet shape toward surface heterogeneities ensures robustness and experimental reproducibility, even when handling attoliter quantities. The unique capabilities and technical simplicity of the presented method introduce a high degree of flexibility and make it pertinent to a diverse range of applications.digital microfluidics | sessile droplets | noncontact printing

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“…Previous studies have shown that change in the apparent contact angle with evaporation can lead to change in the flow field of the droplet, and eventually influence the final deposition pattern (Kuncicky and Velev 2008). Under microgravity conditions, the droplet shape changes and tends to be more spherical.…”

Section: Microgravity Conditionsmentioning

confidence: 99%

Colloidal Material Box: In-situ Observations of Colloidal Self-Assembly and Liquid Crystal Phase Transitions in Microgravity

Ding

Sun

et al. 2016

Microgravity Sci. Technol.

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To study the self-assembly behavior of colloidal spheres in the solid/liquid interface and elucidate the mechanism of liquid crystal phase transition under microgravity, a Colloidal Material Box (CMB) was designed which consists of three modules: (i) colloidal evaporation experimental module, made up of a sample management unit, an injection management unit and an optical observation unit; (ii) liquid crystal phase transition experimental module, including a sample management unit and an optical observation unit; (iii) electronic control module. The following two experimental plans will be performed inside the CMB aboard the SJ-10 satellite in space. (i) Self-assembly of colloidal spheres (with and without Au shell) induced by droplet evaporation, allowing observation of the dynamic process of the colloidal spheres within the droplet and the change of the droplet outer profile during evaporation; (ii) Phase behavior of Mg 2 Al LDHs suspensions in microgravity. The experimental results will be the first experimental observations of depositing ordered colloidal crystals and their self-assembly behavior under microgravity, and will

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Surface-Guided Templating of Particle Assemblies Inside Drying Sessile Droplets

Cited by 102 publications

References 56 publications

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

Open-atmosphere sustenance of highly volatile attoliter-size droplets on surfaces

Colloidal Material Box: In-situ Observations of Colloidal Self-Assembly and Liquid Crystal Phase Transitions in Microgravity

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