Journal article
Coalescence, evaporation and particle deposition of consecutively printed colloidal drops
Soft matter, v 8(35), pp 9205-9213
01 Jan 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The particle deposition dynamics of two consecutively printed evaporating colloidal drops is examined using a fluorescence microscope and a synchronized side-view camera. The results show that the relaxation time of the water-air interface of the merged drop is shorter than that of a single drop impacting on a dry surface. It is also found that both morphology and particle distribution uniformity of the deposit change significantly with varying jetting delay and spatial spacing between two drops. As the drop spacing increases while keeping jetting delay constant, the circularity of the coalesced drop reduces. For the regime where the time scale for drop evaporation is comparable with the relaxation time scale for two drops to completely coalesce, the capillary flow induced by the local curvature variation of the air-water interface redistributes particles inside a merged drop, causing suppression of the coffee-ring effect for the case of a high jetting frequency while resulting in a region of particle accumulation in the middle of the merged drop at a low jetting frequency. By tuning the interplay of wetting, evaporation, capillary relaxation, and particle assembly, the deposition morphology of consecutively printed colloidal drops can hence be controlled.
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Details
- Title
- Coalescence, evaporation and particle deposition of consecutively printed colloidal drops
- Creators
- Xin Yang - Drexel UniversityViral H. Chhasatia - Drexel UniversityJaymeen Shah - Drexel UniversityYing Sun - Drexel University
- Publication Details
- Soft matter, v 8(35), pp 9205-9213
- Publisher
- Royal Soc Chemistry
- Number of pages
- 9
- Grant note
- CAREER 0968927; EEC 1138240 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000307596400022
- Scopus ID
- 2-s2.0-84874871928
- Other Identifier
- 991019167444304721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Physics, Multidisciplinary
- Polymer Science