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    Fabrication of durable haemophobic surfaces on cast acrylic sheets using UV laser micromachining

    Year: 2019

    Journal: Micro Nano Lett., Volume 14, SEP 25, page 1175–1177

    Authors: Paul, Souvik; Mukhopadhyay, Saswata; Mandal, Soumen; Agarwal, Pankaj; Chanda, Nripen

    Organizations: CSIR-Major Lab Project grant under fast track translation scheme [MLP222912]

    Keywords: micromachining; polymers; lenses; blood; casting; laser beam machining; biomedical materials; hydrophobicity; contact angle; hardness testing; Vickers hardness; patterned surfaces; acrylic patterned sample; fabricated patterns; minimum roll-off angle; haemophobic nature; fabricated surfaces; durable haemophobic surfaces; cast acrylic sheets; UV laser micromachining; high-speed microscale patterning procedure; durable blood-repellent patterns; optical lens arrangement; laser engraver; high impact acrylic sheets; peripheral structure spacing; human blood-repellent nature; contact angle goniometer; hardness tests; Vickers hardness; continuous wave ultraviolet laser; CW UV laser; peripheral structure footprint; polymers; collimating lens arrangement; fishbone architecture like microstructures; central structure footprint; hydrophobicity; biomedical applications; static contact angle; wavelength 1; 0 mum to 300; 0 mum; power 5; 0 W; wavelength 445; 0 nm; size 71; 3 mum; size 29; 8 mum; size 77; 8 mum

    A low-cost, high-speed micro-scale patterning procedure for generation of durable blood-repellent patterns on polymers using continuous wave (CW) ultra-violet (UV) laser with optical lens arrangement is demonstrated in this work. A laser engraver which can generate patterned structures in the range of 1-300 mu m employing a 5 W, 445 nm CW UV laser with collimating lens arrangement was developed for this purpose. Subsequently, cell cast high impact acrylic sheets of 5 cm x 5 cm size were patterned to generate fishbone architecture like microstructures with central structure footprint 71.3 mu m, peripheral structure footprint 29.8 mu m and peripheral structure spacing of 77.8 mu m. The patterned acrylic was evaluated for hydrophobicity and human blood-repellent nature using a contact angle goniometer. Hardness tests for checking durability of the patterned surfaces for various biomedical applications were conducted using a hardness tester. The tested Vickers hardness of the acrylic patterned sample was 17.41 HV which indicates durability of the fabricated patterns. Maximum static contact angle of 142.3 degrees and minimum roll-off angle of 11.7 degrees observed for blood on patterned acrylic confirm the haemophobic nature of the fabricated surfaces.
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