Abstract
Movement of nanoparticle was investigated at the vicinity of silver nanofluid by using a microscope equipped with 100X lens. It was observed that silver nanoparticles were constantly moving inside the nanofluid for the first time. To explore the silver nanoparticle movement, the silver nanofluid was mixed with fluorescent nanoparticles. The coated nanoparticles were tracked three-dimensionally using a Delta Vision Elite inverted optical microscope. It was found that Marangoni flow was a possible reason of the nanoparticle movement which was generated by a gradient of the surface tension at the vicinity of the triple line. A gradient of the surface tension was formed by the segregation of the surfactant from the base liquid at the vicinity of the triple line. The surfactant was separated from the base liquid inside the triple region, since they have different affinities for the substrate. It was also shown that ring phenomenon took place when nanoparticle movement was weak or negligible.
Highlights
Silver nanofluid can be used to print electronic tracks three-dimensionally (3D)
The layering phenomenon of silver nanofluid at the triple region was investigated, using an Environmental Scanning Electron Microscope (ESEM) by the author [24]
The motion of nanoparticles inside the silver nanofluid was investigated using an optical microscope equipped with a 100X lens
Summary
Silver nanofluid can be used to print electronic tracks three-dimensionally (3D). Silver nanoparticles are mixed with the base liquid to produce the high concentration silver nanofluid. The silver nanofluid is mixed with surfactant to prevent agglomeration and deposition of nanoparticles. The uniform distribution of silver nanoparticles inside the base liquid plays a significant role on homogeneity of printed tracks. The quality and resolution of 3D printed tracks depend on nanoparticle movement in the triple region during the drying process. It is necessary to understand the mechanisms of possible nanoparticle movement inside the nanofluid
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