Altering the coffee-ring effect by adding a surfactant-like viscouspolymer solution

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/474466.do
DOI
10.1038/s41598-017-00497-x
Title
Altering the coffee-ring effect by adding a surfactant-like viscouspolymer solution
Description
This work was supported by the National Research Foundation of Korea(NRF) Grant funded by the Korean Government (MSIP)(NRF-2016R1A5A1010148, NRF-2015M3A9D7031026). One of authors (DaehoJang) was also supported by a grant from Korea University.
abstract
A uniform deposition of the suspended particles in an evaporating droplet is necessary in many research fields. Such deposition is difficult to achieve, because the coffee-ring effect dominates the internal flow in a droplet. The present study adopts a biocompatible, surfactant-like polymer (Polyethylene glycol, PEG) to break the coffee-ring effect and obtain a relatively uniform deposition of the microparticles with yielding multi-ring pattern over a droplet area. Movements of the suspended particles in evaporating droplets and deposition patterns of them on a glass substrate were analyzed with microscopic images and video files. The PEG in the droplets successfully altered the coffee-ring effect because of the surface tension variation, which induced a centripetal Marangoni flow. Balancing these two phenomena apparently generated the Marangoni vortex. For PEG solution droplets, the pinning-depinning process during evaporation was periodically repeated and multiple rings were regularly formed. In conclusion, adding a surfactant-like viscous polymer in a droplet could provide a uniform coating of suspended particles, such as cells and various biomaterials, which would be essentially required for droplet assays of biomedical applications.
provenance
Made available in Cube on 2018-09-28T10:46:48Z (GMT). No. of bitstreams: 0
language
English
author
Seo, Changdeok
Jang, Daeho
Chae, Jongjin
Shin, Sehyun
accessioned
2018-09-28T10:46:48Z
available
2018-09-28T10:46:48Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/474466.do
Funder
과학기술정보통신부
Funding Program
집단연구지원
Project ID
1711048283
Jurisdiction
Rep.of Korea
Project Name
nano-Biofluignostic Research Center
rights
openAccess
type
article


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