File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1021/acs.langmuir.7b04168
- Scopus: eid_2-s2.0-85043327216
- PMID: 29465242
- WOS: WOS:000427095400014
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Emergence of Droplets at the Nonequilibrium All-Aqueous Interface in a Vertical Hele-Shaw Cell
Title | Emergence of Droplets at the Nonequilibrium All-Aqueous Interface in a Vertical Hele-Shaw Cell |
---|---|
Authors | |
Issue Date | 2018 |
Publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/langmuir |
Citation | Langmuir, 2018, v. 34 n. 9, p. 3030-3036 How to Cite? |
Abstract | The interfacial phenomena at liquid–liquid interfaces remain the subject of constant fascination in science and technology. Here, we show that fingers forming at the interface of nonequilibrium all-aqueous systems can spontaneously break into an array of droplets. The dynamic formation of droplets at the water–water (w/w) interface is observed when a less dense aqueous phase, for instance, the dextran solution, is placed on a denser aqueous phase, the polyethylene glycol solution, in a vertical Hele-Shaw cell. Because of the gradual diffusion of water from the upper phase into the lower phase, a dense layer appears at the nonequilibrium w/w interface. As a result, a periodic array of fingers emerge and sink. Remarkably, these fingers break up and an array of droplets are emitted from the interface. We characterize the wavelength of fingering by measuring the average distance between the dominant fingers. By varying the initial concentrations of the two nonequilibrium aqueous phases, we identify experimentally a phase diagram with a wide parameter space in which finger breaking occurs. Finally, plenty of droplets, spontaneously formed when one phase is continuously deposited onto another aqueous phase, further confirm the robustness of our experimental results. Our work suggests a simple yet efficient approach with a potential upscalability to generate all-aqueous droplets. |
Persistent Identifier | http://hdl.handle.net/10722/260474 |
ISSN | 2023 Impact Factor: 3.7 2023 SCImago Journal Rankings: 0.786 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chao, Y | - |
dc.contributor.author | Mak, SY | - |
dc.contributor.author | Ma, Q | - |
dc.contributor.author | Wu, J | - |
dc.contributor.author | Ding, Z | - |
dc.contributor.author | Xu, L | - |
dc.contributor.author | Shum, HC | - |
dc.date.accessioned | 2018-09-14T08:42:20Z | - |
dc.date.available | 2018-09-14T08:42:20Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Langmuir, 2018, v. 34 n. 9, p. 3030-3036 | - |
dc.identifier.issn | 0743-7463 | - |
dc.identifier.uri | http://hdl.handle.net/10722/260474 | - |
dc.description.abstract | The interfacial phenomena at liquid–liquid interfaces remain the subject of constant fascination in science and technology. Here, we show that fingers forming at the interface of nonequilibrium all-aqueous systems can spontaneously break into an array of droplets. The dynamic formation of droplets at the water–water (w/w) interface is observed when a less dense aqueous phase, for instance, the dextran solution, is placed on a denser aqueous phase, the polyethylene glycol solution, in a vertical Hele-Shaw cell. Because of the gradual diffusion of water from the upper phase into the lower phase, a dense layer appears at the nonequilibrium w/w interface. As a result, a periodic array of fingers emerge and sink. Remarkably, these fingers break up and an array of droplets are emitted from the interface. We characterize the wavelength of fingering by measuring the average distance between the dominant fingers. By varying the initial concentrations of the two nonequilibrium aqueous phases, we identify experimentally a phase diagram with a wide parameter space in which finger breaking occurs. Finally, plenty of droplets, spontaneously formed when one phase is continuously deposited onto another aqueous phase, further confirm the robustness of our experimental results. Our work suggests a simple yet efficient approach with a potential upscalability to generate all-aqueous droplets. | - |
dc.language | eng | - |
dc.publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/langmuir | - |
dc.relation.ispartof | Langmuir | - |
dc.title | Emergence of Droplets at the Nonequilibrium All-Aqueous Interface in a Vertical Hele-Shaw Cell | - |
dc.type | Article | - |
dc.identifier.email | Mak, SY: smak@hku.hk | - |
dc.identifier.email | Shum, HC: ashum@hku.hk | - |
dc.identifier.authority | Mak, SY=rp02728 | - |
dc.identifier.authority | Shum, HC=rp01439 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1021/acs.langmuir.7b04168 | - |
dc.identifier.pmid | 29465242 | - |
dc.identifier.scopus | eid_2-s2.0-85043327216 | - |
dc.identifier.hkuros | 290223 | - |
dc.identifier.volume | 34 | - |
dc.identifier.issue | 9 | - |
dc.identifier.spage | 3030 | - |
dc.identifier.epage | 3036 | - |
dc.identifier.isi | WOS:000427095400014 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0743-7463 | - |