Dependence of the structure of ring-shaped deposits resulting from evaporation of dispersion droplets on initial contact angle

Molchanov, S. P.; Roldughin, V. I.; Chernova-Kharaeva, I. A.; Yurasik, G. A.

doi:10.1134/s1061933x16050094

Cited by 10 publications

(3 citation statements)

References 28 publications

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Section: Manipulation Of Assembly Patterns By Materials In a Dropletmentioning

confidence: 99%

Section: Materials Assembly Patterns and Morphology Evolutionsmentioning

confidence: 99%

“…A hydrophobic substrate will cause the droplet to form a more compact shape with a higher contact angle, while a hydrophilic substrate will cause the droplet to spread out more thinly with a lower contact angle. Figure 3b illustrates the deposition of particles on various hydrophilic surfaces 85 (initial contact angle). On substrates with high wettability and smaller contact angles, drying droplets tend to form ring patterns.…”

Section: Materials Assembly Patterns and Morphology Evolutionsmentioning

confidence: 99%

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Material assembly by droplet drying: From mechanics theories to applications

Chen

Peng

2023

Droplet

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Evaporation of droplets composed of insoluble materials provides a low‐cost and facile route for assembling materials and structures in a wide spectrum of functionalities down to the nanoscale and also serves as a basis for innovating ink‐solution‐based future manufacturing technologies. This review summarizes the fundamental mechanics theories of material assembly by droplet drying both on solid and liquid substrates and in a fully suspended air environment. The evolution of assembly patterns, material deformation, and liquid flow during droplet drying and its response to external stimuli ranging from solution surfactant and pH value, surface geometric pattern and wettability, drying temperature, pressure environment, to electrical field have been highlighted to elucidate the coupling mechanisms between solid materials and liquid solutions and the manipulation strategies for material assembly through an either active or passive means. The recent progresses in ink‐based printing technologies with selected examples are also presented to illustrate the immediate applications of droplet drying, with a focus on printing electronic sensors and biomedical devices. The remaining challenges and emerging opportunities are discussed.

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Section: Manipulation Of Assembly Patterns By Materials In a Dropletmentioning

confidence: 99%

Section: Materials Assembly Patterns and Morphology Evolutionsmentioning

confidence: 99%

Section: Materials Assembly Patterns and Morphology Evolutionsmentioning

confidence: 99%

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Material assembly by droplet drying: From mechanics theories to applications

Chen

Peng

2023

Droplet

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Fabrication of Coffee‐Ring Nanostructured Membranes for Organic Solvent Nanofiltration

Jin,

Zhang,

Tian

et al. 2024

Angewandte Chemie

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Organic solvent nanofiltration (OSN) plays important roles in pharmaceutical ingredients purification and solvent recovery. However, the low organic solvent permeance under cross‐flow operation of OSN membrane hampers their industrial applications. Herein, we report the construction of coffee‐ring structured membrane featuring high OSN permeance. A water‐insoluble crystal monomer that dissolved in EtOH/H2O mixed solvent was designed to react with trimesoyl chloride via interfacial polymerization. Owing to the diffusion of EtOH to n‐hexane, coffee‐ring nanostructure on the support membrane appeared, which served as the template for construction of coffee‐ring structured membrane. The optimal nanostructured membrane demonstrated 2.6‐fold enhancement in the effective surface area with reduced membrane thickness. Resultantly, the membrane afforded a 2.7‐fold enhancement in organic solvent permeance, e.g., ~ 13 LMH/bar for MeOH, without sacrificing the rejection ability. Moreover, due to the rigid monomer structure, the fabricated membrane shows distinctive running stability in active pharmaceutical ingredients purification and the ability for concentration of medicines.

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