Microdroplet deposition under a liquid medium
2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 3, 1171-1177 p.Article in journal (Refereed) Published
An experimental and numerical study of the factors affecting the reproducibility of microdroplet depositions performed under a liquid medium is presented. In the deposition procedure, sample solution is dispensed from the end of a capillary by the aid of a pressure pulse onto a substrate with pillar-shaped sample anchors. The deposition was modeled using the convective Cahn-Hilliard equation coupled with the Navier-Stokes equations with added surface tension and gravity forces. To avoid a severe time-step restriction imposed by the fourth-order Cahn-Hilliard equation, a semi-implicit scheme was developed. An axisymmetric model was used, and an adaptive finite element method was implemented. In both the experimental and numerical study it was shown that the deposited volume mainly depends on the capillary-substrate distance and the anchor surface wettability. A critical equilibrium contact angle has been identified below which reproducible depositions are facilitated.
Place, publisher, year, edition, pages
2007. Vol. 23, no 3, 1171-1177 p.
Contact angle; Deposition; Finite element method; Gravitational effects; Mathematical models; Navier Stokes equations; Surface tension; Cahn Hilliard equations; Liquid mediums; Microdroplet deposition; Pressure pulses; Fluid dynamics; article; mathematical computing; particle size; reproducibility; solution and solubility; surface tension; technique; wettability; Methods; Numerical Analysis, Computer-Assisted; Particle Size; Reproducibility of Results; Solutions; Surface Tension; Wettability
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-7213DOI: 10.1021/la0626712ISI: 000243684100035PubMedID: 17241029ScopusID: 2-s2.0-33847175859OAI: oai:DiVA.org:kth-7213DiVA: diva2:12154
QC 201008232007-05-292007-05-292010-08-23Bibliographically approved