Crystallization of Femtoliter Surface Droplet Arrays Revealed by Synchrotron Small Angle X-ray Scattering

Dyett, B, Zychowski, L, Bao, L, Meikle, T, Peng, S, Yu, H, Li, M, Strachan, J, Kirby, N, Logan, A, Conn, C and Zhang, X 2018, 'Crystallization of Femtoliter Surface Droplet Arrays Revealed by Synchrotron Small Angle X-ray Scattering', Langmuir, vol. 34, no. 32, pp. 9470-9476.


Document type: Journal Article
Collection: Journal Articles

Title Crystallization of Femtoliter Surface Droplet Arrays Revealed by Synchrotron Small Angle X-ray Scattering
Author(s) Dyett, B
Zychowski, L
Bao, L
Meikle, T
Peng, S
Yu, H
Li, M
Strachan, J
Kirby, N
Logan, A
Conn, C
Zhang, X
Year 2018
Journal name Langmuir
Volume number 34
Issue number 32
Start page 9470
End page 9476
Total pages 7
Publisher American Chemical Society
Abstract The crystallization of oil droplets is critical in the processing and storage of lipid-based food and pharmaceutical products. Arrays of femtoliter droplets on a surface offer a unique opportunity to study surfactant-free colloidlike systems. In this work, the crystal growth process in these confined droplets was followed by cooling a model lipid (trimyristin) from a liquid state utilizing synchrotron small-angle X-ray scattering (SAXS). The measurements by SAXS demonstrated a reduced crystallization rate and a greater degree of supercooling required to trigger lipid crystallization in droplets compared to those of bulk lipids. These results suggest that surface droplets crystallize in a stochastic manner. Interestingly, the crystallization rate is slower for larger femtoliter droplets, which may be explained by the onset of crystallization from the three-phase contact line. The larger surface nanodroplets exhibit a smaller ratio of droplet volume to the length of three-phase contact line and hence a slower crystallization rate.
Subject Soft Condensed Matter
Physical Chemistry of Materials
Colloid and Surface Chemistry
DOI - identifier 10.1021/acs.langmuir.8b01252
Copyright notice © 2018 American Chemical Society
ISSN 0743-7463
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