Influence of surface orientation on the organization of nanoparticles in drying nanofluid droplets

Hampton, Marc A., Nguyen, Tuan A. H., Nguyen, Anh V., Xu, Zhi Ping, Huang, Longbin and Rudolph, Victor (2012) Influence of surface orientation on the organization of nanoparticles in drying nanofluid droplets. Journal of Colloid and Interface Science, 377 1: 456-462. doi:10.1016/j.jcis.2012.03.024


Author Hampton, Marc A.
Nguyen, Tuan A. H.
Nguyen, Anh V.
Xu, Zhi Ping
Huang, Longbin
Rudolph, Victor
Title Influence of surface orientation on the organization of nanoparticles in drying nanofluid droplets
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
1095-7103
Publication date 2012-07-01
Sub-type Article (original research)
DOI 10.1016/j.jcis.2012.03.024
Volume 377
Issue 1
Start page 456
End page 462
Total pages 7
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Collection year 2013
Language eng
Abstract The influence of droplet orientation on the flow directed organization of nanoparticles in evaporating nanofluid droplets is important for the efficiency of foliar applied fertilizers and contamination adhesion to the exterior of buildings. The so called “coffee ring” deposit resulting from the evaporation of a sessile nanofluid drop on a hydrophilic surface has received much attention in the literature. Deposits forming on hydrophobic surfaces in the pendant drop position (i.e. hanging drop), which are of importance in foliar fertilizer and exterior building contamination, have received much less attention. In this study, the deposit patterns resulting from the evaporation of water droplets containing silica nanoparticles on hydrophobic surfaces orientated in the sessile or pendant configuration are compared. In the case of a sessile drop the well known coffee ring pattern surrounding a thin nanoparticle layer was formed. A deposit consisting of a thin coffee ring surrounding a bump was formed in the pendant position. A mechanism involving flow induced aggregation at the droplet waist, settling, orientation dependant accumulation within the drop and pinning of the contact line is suggested to explain the findings. Differences in the contact area and adhesion of deposits with surface orientation will affect the efficiency and rainfastness of foliar fertilizers and the cleanliness of building exteriors.
Keyword Nanoparticle deposit
Nanofluid
Drop evaporation
Sessile drop
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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