Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Porous Bio-degradable Nano-fiber Machining by Femtosecond Laser

다공성 친바이오 나노섬유 극초단 레이저 가공특성 연구

  • Choi, Hae-Woon (Department of Mechanical and Automotive Engineering, Keimyung Univ.)
  • 최해운 (계명대학교 기계자동차공학과)
  • Received : 2011.08.16
  • Accepted : 2011.11.24
  • Published : 2012.03.01
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Abstract

Electrospun meshed poly-caprolactone PCL was patterned by femtosecond laser with linear grooves. As parametric variables, focus spot size, pulse energy, and scanning speed were varied to determine the affects on groove size and the characteristics of the electrospun fiber at the edges of these grooves. The femtosecond laser was seen to be an effective means for flexibly structuring the surface of ES PCL scaffolds and the width of the ablated grooves was well controlled by laser energy and focus spot size. The ablation threshold was measured to be $14.9J/cm^2$ which is a little higher than other polymers. These affects were attributed to optical multiple reflections inside nano-fibers. By the laser-induced plasma at higher pulse energies, some melting of fibers was observed.

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References

  1. Reneker, D. H. and Chun, I., "Nanometre diameter fibres of polymer, produced by electrospinning," Nanotechnology, Vol. 7, No. 3, pp. 216-223, 1996. https://doi.org/10.1088/0957-4484/7/3/009
  2. Baumgarten, P. K., "Electrostatic spinning of acrylic microfibres," J. Colloid Interface Sci., Vol. 36, No. 1, pp. 71-79, 1971. https://doi.org/10.1016/0021-9797(71)90241-4
  3. Lannutti, J., Ma, T., Tomasko, D. and Farson, D., "Electrospinning for tissue engineering scaffolds," Material Science and Engineering C, Vol. 27, No. 3, pp. 504-509, 2007. https://doi.org/10.1016/j.msec.2006.05.019
  4. Lee, K., Khil, M., Ra, Y. and Lee, D., "Characterization of nano-structured poly($\epsilon$-caprolactone) nonwoven mats via electrospinning," Polymer, Vol. 44, No. 4, pp. 1287-1294, 2003. https://doi.org/10.1016/S0032-3861(02)00820-0
  5. Choi, H., Johnson, J., Nam, J., Farson, D. and Lannutti, J., "Structuring electrospun PCL nanofiber tissue scaffolds by femtosecond laser ablation," Journal of Laser Applications, Vol. 19, No. 4, pp. 225-231, 2007. https://doi.org/10.2351/1.2795749
  6. Choi, H., "Polycarbonate Track-Etched Membrane Micromachining by Ultrafast Pulse Laser," Journal of the Korean Society for Precision Engineering, Vol., 28, No. 1, pp. 24-30, 2011.
  7. Farson, D., Choi, H., Zimmerman, B., Steac, J., Chalmers, J., Olesik, S. and Lee, J., "Femtosecond laser micromachining of dielectric materials for biomedical applications," Journal of Micromechanics and Microengineeirng, Vol. 18, No. 3, Paper No. 035020, 2008.
  8. Choi, H., "Ultrashort Laser Material Interaction and Its Biomedical and Joining Applications," Journal of Korean Weldning and Joining, Vol. 26, No. 4, pp. 27-33, 2008. https://doi.org/10.5781/KWJS.2008.26.4.027
  9. Lee, J. and Sohn, H., "Ultrafast laLaser Micro- Machining Technology," Journal of the Korean Society for Precision Engineering, Vol. 27, No. 2, pp. 7-12, 2010.
  10. Labet, M. and Thielemans, M., "Synthesis of polycaprolactone: a review," Chem. Soc. Rev., Vol. 38, No. 12, pp. 3484-3504, 2009. https://doi.org/10.1039/b820162p
  11. Cheong, W. and Welch, A., "A review of the optical properties of biological tissues," IEEE Journal of Quantum Electronic, Vol. 26, No. 12, pp. 2166-2185, 1990. https://doi.org/10.1109/3.64354
  12. Mudgett, P. and Richards, L. W., "Multiple scattering calculations for technology," Applied Optics, Vol. 10, No. 7, pp. 1485-1502, 1971. https://doi.org/10.1364/AO.10.001485
  13. Burger, T., Kuhn, J., Ebel, S. and Fricke, J., "Diffuse reflectance and transmittance spectroscopy for the quantitative determination of scattering and absorption coefficients in quantitative power analysis," Appl. Spectrosco., Vol. 51, No. 9, pp. 1323-1329, 1997. https://doi.org/10.1366/0003702971941999