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Your search keyword '"Persano, L"' showing total 4 results
Start Over Author "Persano, L" Publisher royal society of chemistry
4 results on '"Persano, L"'

3. Highly sticky surfaces made by electrospun polymer nanofibers

Author

Matteo Pierno, Dario Pisignano, Giampaolo Mistura, Luana Persano, F. Raccanello, Silvia Varagnolo, Maria Moffa, Varagnolo, S., Raccanello, F., Pierno, M., Mistura, G., Moffa, M., Persano, L., and Pisignano, Dario

Subjects
Materials science, General Chemical Engineering, FOS: Physical sciences, Wetting, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, 010402 general chemistry, 01 natural sciences, law.invention, Contact angle, law, Composite material, Filtration, chemistry.chemical_classification, Chemistry (all), General Chemistry, Adhesion, Polymer, 021001 nanoscience & nanotechnology, Functional surfaces, Electrospinning, 0104 chemical sciences, Chemistry, chemistry, Nanofiber, Soft Condensed Matter (cond-mat.soft), Adhesive, 0210 nano-technology
Abstract

We report on a comprehensive study of the unique adhesive properties of mats of polymethylmethacrylate (PMMA) nanofibers produced by electrospinning. Fibers are deposited on glass, varying the diameter and the relative orientation of the polymer filaments (random vs aligned configuration). While no significant variation is observed in the static contact angle (about 130{\deg}) of deposited water drops upon changing the average fiber diameter up to the micrometer scale, fibers are found to exhibit unequalled water adhesion. Placed vertically, they can hold up water drops as large as 60 microL, more than twice the values typically obtained with hairy surfaces prepared by different methods. For aligned fibers with anisotropic wetting behavior, the maximum volume measured in the direction perpendicular to the fibers goes up to 90 {\mu}L. This work suggests new routes to tailor the wetting behavior on extended areas by nanofiber coatings, with possible applications in adsorbing and catalytic surfaces, microfluidic devices, and filtration technologies., Comment: 17 pages, 5 figures, 2 tables

Published
2017

4. Sub-ms dynamics of the instability onset of electrospinning.

Author

Montinaro M, Fasano V, Moffa M, Camposeo A, Persano L, Lauricella M, Succi S, and Pisignano D

Abstract

Electrospun polymer jets are imaged for the first time at an ultra-high rate of 10,000 frames per second, investigating the process dynamics, and the instability propagation velocity and displacement in space. The polymer concentration, applied voltage bias and needle-collector distance are systematically varied, and their influence on the instability propagation velocity and on the jet angular fluctuations is analyzed. This allows us to unveil the instability formation and cycling behavior, and its exponential growth at the onset, exhibiting radial growth rates of the order of 10(3) s(-1). Allowing the conformation and evolution of polymeric solutions to be studied in depth, high-speed imaging at the sub-ms scale shows significant potential for improving the fundamental knowledge of electrified jets, leading to finely controllable bending and solution stretching in electrospinning, and consequently better designed nanofiber morphologies and structures.

Published
2015
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