Effect of surface change by vacuum drying on the sedimentation stability of iron nanoparticles in volatile organic solvents
- Authors
- Ha, Heebo; Thompson, Russ; Matteini, Paolo; Yoo, Seung Jo; Hwang, Byungil
- Issue Date
- May-2022
- Publisher
- Elsevier B.V.
- Keywords
- Aggregation; Annealing; Dispersions; Iron nanoparticles; Sedimentation stability
- Citation
- Colloids and Interface Science Communications, v.48
- Journal Title
- Colloids and Interface Science Communications
- Volume
- 48
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/57666
- DOI
- 10.1016/j.colcom.2022.100625
- ISSN
- 2215-0382
2215-0382
- Abstract
- Sedimentation stability of iron nanoparticles (FeNPs) in low viscosity, volatile organic solvents such as ethanol and MEK is crucial for the high-quality production of FeNP-based electronics. Adding dispersants represents nowadays the common strategy to improve the sedimentation stability of FeNPs, but suffers from toxicity and high costs. Here, we present a simple vacuum drying process for enhancing the sedimentation stability of FeNPs in ethanol without using dispersants. In-situ light transmission and scattering detection showed that vacuum-dried FeNPs in ethanol and MEK sedimented much slower than those of non-treated FeNPs. The cause for the enhanced sedimentation stability was explained by Stoke's law and inter-particle attraction force change due to the reduced hydroxyl groups by the vacuum annealing. A systematic analysis of the FeNP surfaces before and after annealing provided a detailed picture of the advantages to carry out a simple vacuum annealing process to improve sedimentation stability. © 2022 The Authors
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