Wide band Fresnel super-resolution applied to capillary breakup of viscoelastic fluids
- 211 Downloads
We report a technique based on Fresnel diffraction with white illumination that permits the resolution of capillary surface patterns of <100 nm. We investigate Rayleigh–Plateau-like instability on a viscoelastic capillary bridge and show that we can overcome the resolution limit of optical microscopy. The viscoelastic filaments are approximately 20 μ thick at the end of the thinning process when the instability sets in. The wavy distortions grow exponentially in time and the pattern is resolved by an image treatment that is based on an approximation of the measured rising flank of the first Fresnel peak.
This work was supported by the DFG-Project WA 1336 and Thermo Haake. JF thanks the Alexander von Humboldt foundation, Global Site S.L., and Mrs. Audrey Shaw for the English revision.
- Betzig E, Trautman JK (1992) Near-Field Optics: microscopy, spectroscopy, and surface modification beyond the diffraction limit. Science 257:189Google Scholar
- Echt E (2002) Principles of optics. 4th edn. Pearson Education, published as Adison Wesley, San FranciscoGoogle Scholar
- Sattler R (2010) Untersuchungen zum kapillaren Abriss vonverdaeunnten und halbkonzentrierten. Polymerloesungen, Universitaet des SaarlandesGoogle Scholar
- Schäfter and Kirchhoff GmbH (2007) Let there be shadow laser diffraction system for diameter, geometry and edge detection. http://www.SuKHamburg.de
- Scharr H (2000) Optimale operatoren in der digitalen bildverarbeitung. Dissertation, Ruprecht-Karls-Universitt HeidelbergGoogle Scholar
- Song B, Springer J (1996) Determination of interfacial tension from the profile of a pendant drop using computer-aided image processing. J Coll Interface Sci 184:64Google Scholar