title: A superhydrophilic nitinol shape memory alloy with enhanced anti-biofouling and anti-corrosion properties.
abstract: This work reports on a nitinol (NiTi) surface modification scheme based on a chemical oxidation method, and characterizes its effects on wetting, biofouling and corrosion. The scheme developed is also compared with selected previous oxidation methods. The proposed method turns NiTi into superhydrophilic in ~5 min, and the static contact angle and contact angle hysteresis were measured to be ~7° and ~12°, respectively. In the PRP (platelet rich plasma) test, platelet adhesion was reduced by ~89% and ~77% respectively, compared with the original NiTi and the NiTi treated with the previous chemical oxidation scheme. The method developed provides a high (~1.1 V) breakdown voltage, which surpasses the ASTM standard for intervascular medical devices. It also provides higher superhydrophilicity, hemo-compatibility and anti-corrosion resistance than previous oxidation schemes, with a significantly reduced process time (~5 min), and will help the development of high performance NiTi devices.
authors.affiliation: a Department of Mechanical Engineering , Kyung Hee University , Yongin , Republic of Korea.
authors.forename: K
authors.initials: K
authors.lastname: Song
authors.affiliation: b R&D Center , S&H Co., Ltd , Suwon , Republic of Korea.
authors.forename: T
authors.initials: T
authors.lastname: Min
authors.affiliation: c Technology Center for Offshore Plant Industries , Korea Research Institute of Ships and Ocean Engineering , Daejeon , Republic of Korea.
authors.forename: J-Y
authors.initials: JY
authors.lastname: Jung
authors.affiliation: d Department of Clinical Pharmacology , Seoul National University Hospital , Seoul , Republic of Korea.
authors.forename: D
authors.initials: D
authors.lastname: Shin
authors.affiliation: a Department of Mechanical Engineering , Kyung Hee University , Yongin , Republic of Korea.
authors.forename: Y
authors.initials: Y
authors.lastname: Nam
mesh_terms: D000497:Alloys / Q000494:pharmacology*; D057219:Biofouling; D003343:Corrosion; D006801:Humans; D013499:Surface Properties; D017155:Wettability
chemical_list: D000497:Alloys; C013616:nitinol
keywords: Nitinol; adhesion; breakdown; corrosion; platelet; superhydrophilic