Fabrication of a Functional Relief on the Surface of a Polyvinyl Chloride Film by Nanosecond Laser Microtexturing
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ANOPHOTONICS
Fabrication of a Functional Relief on the Surface of a Polyvinyl Chloride Film by Nanosecond Laser Microtexturing1 I. V. Krylacha, *, S. I. Kudryashova, b, R. O. Olekhnovicha, M. I. Fokinaa, V. E. Sitnikovaa, M. K. Moskvina, N. N. Shchedrinaa, and M. V. Uspenskayaa a ITMO
b
University, St. Petersburg, 171409 Russia Lebedev Physical Institute, Moscow, 119991 Russia * e-mail: [email protected]
Received January 18, 2020; revised January 18, 2020; accepted April 20, 2020
Abstract—Modification of the surface of polyvinyl chloride (PVC) deposited on a copper foil under the influence of nanosecond laser radiation with different peaks fluence was studied by using infrared spectroscopy of attenuated total reflection and optical microscopy. The dependences of the wetting angle of the texture surface with water on the peak fluence of laser radiation were measured. The obtained various relief textures demonstrate a sharp drop in water contact angles from (∼50°) to super hydrophilic (∼15°), which allows us to design and fabricate micro-scale elements of laboratory devices for the tasks of bactericidal treatment, collection and removal of liquids, as well as their separation and purification. A stable increase in the contact angles of water with the surface of the textures to hydrophobic (up to ∼140°) observed over time indicates degradation of the polymer coating. Keywords: infrared spectroscopy, optical microscopy, nanosecond laser microtexturing, direct laser manufacturing, cross-raster scanning, ordered relief, contact angle, surface microfluidics, polymers, metals DOI: 10.1134/S0030400X20080184
INTRODUCTION The fundamentals of the theory of wetting structures with evolved relief and chemical heterogeneity are already well developed [1]. Some fundamental works should be noted: V.N. Eremenko [2] laid the foundations for measuring the surface energy of metals by the sessile drop method; work of P.A. Rebinder [3] laid the foundation of the scientific justification for the use of surfactants to control wetting, which has received wide industrial application in industrial processes (flotation, cleaning materials from contaminants, washing technology, etc.) and, of course, the work by B.D. Summ and Yu.V. Goryunova [4], thanks to which a new direction in physicochemical mechanics appeared—the kinetics of wetting and spreading processes. Nevertheless, the modern capabilities of high-performance and cheap laser ordered or disordered texturing of surfaces at the micro and macro levels [5, 6] allow to create innovative integrated functional microfluidic devices [7–10] micro (sub) meter sizes with directed wetting and flow of liquids for studying new physicochemical processes and practical 1 The 2nd International School-Conference for young researchers
“Smart Nanosystems for Life,” St. Petersburg, Russia, December 10–13, 2019.
applications. In particular, high optical transparency, mechanical strength, and relative low cost of polyvinyl chloride ensure its effective use as a coating to create a functional relief
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