Evaporation Dynamics of Mixed-Nanocolloidal Sessile Droplets
| Autor: | Saptarshi Basu, Binita Pathak, Sandeep Hatte |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Internal flow Chemistry Mechanical Engineering Dynamics (mechanics) Analytical chemistry Evaporation Substrate (chemistry) Nanoparticle 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Chemical engineering Pulmonary surfactant Electrochemistry General Materials Science Sodium dodecyl sulfate 0210 nano-technology Spectroscopy |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| Popis: | Evaporation dynamics of a particle-laden droplet has been a topic of interest in recent times owing to its widespread applications, ranging from surface patterning to drug delivery systems. The interplay of evaporation-induced internal flow dynamics, contact line dynamics, and nanoparticle self-assembly govern the morphologies of the residual structures. Fine-tuning of these residual structures is thus possible by controlling the governing parameters. A nanoparticle-laden sessile droplet placed on a hydrophobic substrate undergoes buckling phenomenon that results in a domelike structure with cavity on the surface. In the present work, it is shown that the addition of sodium dodecyl sulfate (SDS) surfactant in minute concentrations (0.005-0.02 wt %) can affect the contact line dynamics and subsequent buckling dynamics of a nanoparticle-laden droplet evaporating on a hydrophobic substrate. With increase in the initial SDS concentration, the morphologies of the residual structures show transition from a buckled dome structure to a flat flowerlike shape. Moreover, a critical SDS concentration (0.0075 wt % in 20 wt % silica) is identified for the complete suppression of buckling instabilities. Last, the effects of droplet spreading on the surface crack dynamics are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|