کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5368079 1388383 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wettability modification of electrospun poly(ɛ-caprolactone) fibers by femtosecond laser irradiation in different gas atmospheres
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Wettability modification of electrospun poly(ɛ-caprolactone) fibers by femtosecond laser irradiation in different gas atmospheres
چکیده انگلیسی

The effect of femtosecond laser irradiation in air and in O2 and CF4 gas flows on the wettability of electrospun poly(ɛ-caprolactone) fiber tissue scaffolds was studied. Laser power, focus spot size, raster scan spacing and gas atmosphere were varied in experiments. SEM imaging showed the average fiber diameter and surface porosity sizes were both altered by ablation. The micro-scale surface roughness measured by scanning laser profilometry was found to have a non-monotonic relationship to the surface wettability measured by the contact angle of sessile water droplets. In contrast, surface water contact angle continuously decreased with increased oxygen atomic percentage and oxygen-containing group fraction as measured by XPS. Further, the oxygen content was larger for more extensively ablated fiber surfaces, regardless of whether the increased ablation was caused by high laser power, smaller scanning space or smaller defocusing distance. Of the three gas atmospheres, O2 gas flow was the most favorable environment for increasing surface oxidization, resulting in the largest water contact angle decrease for given laser power. For CF4 gas flow, the least oxidization occurred, and the magnitude of water contact angle decrease was smallest for treatment at a given laser power.

Research highlights▶ The wettability of electrospun poly(ɛ-caprolactone) nanofiber tissue scaffolds was modified by femtosecond laser irradiation in air and with O2 and CF4 gas flows. ▶ Surface water contact angle continuously decreased with increased oxygen atomic percentage and oxygen-containing group fraction. ▶ Of the three gas atmospheres, O2 gas flow was the most favorable environment for increasing surface oxidization, resulting in the largest water contact angle decrease for given laser power.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 257, Issue 8, 1 February 2011, Pages 3547-3553
نویسندگان
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