Bioactive NiTi shape memory alloy fabricated by oxidizing in H2O2 solution and subsequent NaOH treatment

The applications and research progresses of nickel–titanium shape memory alloy in reconstructive surgery

“…The former treatment produces a sodium titanate layer on titanium surface, while the latter forms a titania gel layer. Both sodium titanate layer and titania gel layer have the ability to induce deposition of bone-like apatite in vitro and in vivo and thus are considered bioactive [32]. Chrzanowski's research also confirmed that alkali treatment and spark oxidation can resulted in some bioactivity [33].…”

Microstructural characteristics and biocompatibility of a Type-B carbonated hydroxyapatite coating deposited on NiTi shape memory alloy

“…Biomimetic deposition of the HA coating was attributed to the catalytic effect of Na 2 TiO 3 /TiO 2 gel layer with a wormlike surface structure and many Ti-OH groups on the chemically-pretreated NiTi SMA [6,7]. FTIR spectra indicate that the CO 3 2− groups were present in the HA coating.…”

“…We recently reported the influences of the composite pretreatment by oxidizing in H 2 O 2 solution and subsequent treatment in NaOH solution on surface microstructural characteristics of NiTi SMA, and found that a novel bioactive graded surface layer was present on NiTi SMA by such a composite pretreatment [6,7]. This bioactive layer is mainly composed of sodium titanate (Na 2 TiO 3 ) and titania, and can induce the nucleation and growth of HA in SBF in a short time, which indicates a promising way to produce an ideal HA coating on NiTi SMA by biomimetic growth.…”

“…In this paper, bioactive NiTi SMA was firstly fabricated by the composite pretreatment with the boiling 30% H 2 O 2 solution and subsequent 1 M NaOH solution based on our previous work [6]. Then a carbonated HA coating was prepared on bioactive NiTi substrate by biomimetic deposition.…”

Characteristics, apatite-forming ability and corrosion resistance of NiTi surface modified by AC anodization

“…In these (and also many other) studies on HA coating and bioactive treatment, the substrates were Ti and its alloys. On the other hand, similar studies on NiTi are much less commonly reported [23][24][25][26][27][28], partly because of the shorter history of NiTi in implant applications compared with Ti, and partly because corrosion is the major concern in using NiTi. Moreover, the issues of corrosion resistance and bioactivity for NiTi are usually treated separately, with some studies targeting at improving corrosion resistance and others at enhancing the potential bioactivity.…”