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Hontsu, S., Yoshikawa, K., Kato, N., Kawakami, Y., Hayami, T., Nishikawa, H., Kusunoki, M. and Yamamoto, K. (2011) Restoration and Conservation of Dental Enamel using a Flexible Apatite Sheet. Journal of the Australian Ceramic Society, 47, 11-13.

has been cited by the following article:

• TITLE: Direct Process to Prepare Crystallized Freestanding Membranes of Hydroxyapatite Using Sacrificial Layer of Barium-Compounds

  AUTHORS: Hiroaki Nishikawa, Takafumi Nishii

  KEYWORDS: Freestanding Membrane, Hydroxyapatite, Sacrificial Layer, Ba-compounds

  JOURNAL NAME: Journal of Crystallization Process and Technology, Vol.7 No.2, April 30, 2017

  ABSTRACT: Freestanding membrane (FSM) of hydroxyapatite (HA) is a thin sheet of pure HA without any supporting substrates. Our original preparation process of FSM of HA had three steps: The first was the deposition of HA layer on sacrificial layer of solvent-soluble materials, the second was separation of FSM of HA by means of dissolution of sacrificial layer, and the third was post-annealing to crystallize FSM of HA. To date, the post-annealing process was a serious bottleneck of productivity owing to its too long time. In this short report, we proposed a novel sacrificial layer, heatproof and water-soluble Ba-compound, which makes the direct deposition of crystallized HA possible due to its heatproof property because the problem on the original process was that the previous sacrificial layers have no heatproof property and HA layer should be deposited as amorphous. We can deposit the Ba-compound sacrificial layer only in 1 hour followed with the direct deposition of crystallized HA layer, substituting the 20 hours of post-annealing. The FSM of HA was separated successfully from the substrate by means of dissolution of Ba-compound with water. Our novel process can shrink the process time by 19 hours.