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Keywords:

  • 68.35.Np;
  • 81.05.Uw;
  • 87.14.E−;
  • 87.17.Rt;
  • 87.64.Dz;
  • 87.85.J−

Abstract

We investigate adhesion of fetal bovine serum (FBS) on diamond surfaces which have alternating H/O-terminated surface patterns of 30 µm width prepared by hydrogen and oxygen plasma. The samples are immersed into 15% FBS in McCoy's 5A supporting medium and characterized by in situ atomic force microscopy (AFM) during 6 days of adsorption. Within the first day, 2–4 nm primary layer is formed on both H-/O-terminated surfaces. After 6 days, we observe 17 ± 5 nm FBS layer on O-terminated surface and 35 ± 5 nm layer on H-terminated surface. Adhesion of the primary and secondary layer is weaker on H-terminated surface. We present a model of FBS protein layers on H-/O-terminated diamond and we discuss implications for a preferential cell growth on O-terminated diamond. We also show that the preferential cell growth is not affected by the long-term FBS pre-adsorption.