Millimeter-long nanofibers of PMMA spun at super-high speed by ablation with a single pulse of a KrF excimer laser View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-12

AUTHORS

F. Weisbuch, V.N. Tokarev, S. Lazare, C. Belin, J.L. Bruneel

ABSTRACT

A new form of matter removal in laser ablation is reported. Polymethylmethacrylate (PMMA) nanofibers are obtained when a PMMA target is irradiated with a single pulse of a KrF excimer laser, whose beam is sharply imaged on a square of side the order of 140 μm, so that a strong intensity gradient is produced. The fluence threshold at which fibers appear, 3 J/cm2, is much larger than the ablation threshold, approximately 0.8–1 J/cm2. Above this fluence, the melt depth is then large enough and the temperature profile is such that explosive boiling is obtained. The model suggests an expulsion of energetic droplets from the intense pressure of the plume to the exterior of the spot. For the transient melt of a polymeric viscoelastic liquid resulting from UV-laser excitation, such droplets provide the heads of the jets pulled from the melt bath, giving rise, after solidification, to nanofibers. The speed of fiber spinning is extremely high (∼800 m/s) and unusual properties of the laser-produced nanofibers may be expected. More... »

PAGES

677-680

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00339-002-1454-0

DOI

http://dx.doi.org/10.1007/s00339-002-1454-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1049988251


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