Article history: This work reports an investigation of the surface modiﬁcations induced by irradiation with nanosecond Received 7 December 2015 laser pulses of ultraviolet and visible wavelengths on crosslinked hydrophilic co-polymeric materi- Received in revised form 3 February 2016 als, which have been functionalized with 1-vinylimidazole as a co-monomer. A comparison is made Accepted 4 February 2016 between hydrogels differing in the base co-monomer (N,N-dimethylaminoethyl methacrylate and N- Available online 6 February 2016 [3-(dimethylamino)propyl] methacrylamide) and in hydration state (both swollen and dried states). Formation of craters is the dominant morphological change observed by ablation in the visible at 532 nm, Keywords: whereas additional, less aggressive surface modiﬁcations, chieﬂy microfoams and roughness, are devel- Surface morphological modiﬁcation oped in the ultraviolet at 266 nm. At both irradiation wavelengths, threshold values of the incident laser UV–vis nanosecond pulsed laser irradiation ﬂuence for the observation of the various surface modiﬁcations are determined under single-pulse laser Laser ablation craters irradiation conditions. It is shown that multiple-pulse irradiation at 266 nm with a limited number of laser Laser foaming Crosslinked hydrophilic co-polymers shots can be used alternatively for generating a regular microfoam layer at the surface of dried hydro- Swell/dried hydrogels gels based
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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