Tan Guoxin
,
Ouyang Kongyou
,
Wang Hang
,
Zhou Lei
,
Wang Xiaolan
,
Liu Yan
,
Zhang Lan
,
Ning Chengyun
材料科学技术（英文）
doi:10.1016/j.jmst.2016.07.012
The objective of this study was to determine the role of functional groups of silane coupling on bioactive titanium (Ti) surface by electrochemical deposition, and calcium phosphate (CaP) coating, as well as bone cell adhesion and proliferation. Methyl group (—CH3), amino group (—NH2), and epoxy group (—glyph name—C(O)C) were introduced onto the bioactive Ti surface using self-assembled monolayers (SAMs) with different silane coupling agents as molecular bridges. The effect of the surface functional groups on the growth features of the CaP crystals was analyzed (including chemical compositions, element content, minerals morphology and crystal structure etc.). CH3-terminated SAMs showed a hydrophobic surface and others were hydrophilic by contact angle measurement; NH2-terminated SAMs showed a positive charge and others were negatively charged using zeta-potential measurement. Scanning electron microscopy results confirmed that flower-like structure coatings consisting of various pinpoint-like crystals were formatted by different functional groups of silane coupling, and the CaP coatings were multicrystalline consisting of hydroxyapatite (HA) and precursors. CaP coating of CH3-terminated SAMs exhibited more excellent crystallization property as compared to coatings of —NH2 and —C(O)C groups. In vitro MC3T3-E1 cells adhesion and proliferation were performed. The results showed that CaP coatings on silane coupling functionalized surfaces supported cell adhesion and proliferation. Thus, these functional groups of silane coupling on Ti can form homogeneous and oriented nano-CaP coatings and provide a more biocompatible surface for bone regeneration and biomedical applications.
关键词:
Silane coupling
,
Molecular bridge
,
Calcium phosphate coatings
,
Titanium
,
Electrochemical deposition
曹瑞雄
,
陶则超
,
王宏宝
,
郭全贵
新型炭材料
采用AlCl3-NaCl-KCl混合熔盐(质量比8：1：1)在石墨表面电镀得到铝金属镀层/石墨复合材料。通过调节电流密度和电镀时间可实现对铝金属镀层厚度和表面形貌的控制。在相同电流密度(1.06 A/dm2)下,电镀时间在240 min以内时,电镀时间越长,镀层越厚(最大厚度140μm),但电镀时间达到300 min时,铝金属镀层表面出现枝状结构；电流密度越大铝金属沉积速率越快,在相同电镀时间(120 min)时,电流密度达到3.28 A/dm2,得到铝镀层最厚(148μm)。铝金属镀层与石墨基体间的附着强度较高,铝金属层可提高复合材料的热导率,热导率从最初的115.7 W/(m·K)提高至199.0 W/(m·K)。
关键词:
电镀
,
熔盐
,
石墨
,
铝
,
结合性能
,
热导率
