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Title: | TiNi形狀記憶合金以脈衝電漿沉積HMDSN薄膜之研究 The Study on PPHMDSN Thin Film Deposited on TiNi SMA by DC-pulsed PECVD |
Authors: | Chien-Hui Chen 陳芊卉 |
Advisor: | 吳錫侃 |
Keyword: | TiNi形狀記憶合金,六甲基二矽胺,脈衝式電漿輔助化學沉積法,丙烯醯胺(AAm),肝素, TiNi shape memory alloy,HMDSN,DC-Pulsed PECVD,AAm,Heparin, |
Publication Year : | 2006 |
Degree: | 碩士 |
Abstract: | 本研究以TiNi形狀記憶合金為基材使用六甲基二矽胺(Hexamethyldisilazane, HMDSN)單體以脈衝式電漿輔助化學沉積法 (PECVD) 沉積非晶質SiC:H薄膜於TiNi合金之上並利用UV 光誘導接枝聚合丙烯醯胺(Acrylamide, AAm)單體,改變薄膜表面官能基,做酵素固定使TiNi合金成為具抗凝血生化特性之生醫材料。薄膜沉積速率快,表面形貌均勻、孔洞少、粗糙度低均在2~4nm之間。並顯著地提升抗腐蝕性,使腐蝕電流密度下降約至少四個數量級。由FTIR所得之吸收光譜,可知Si-C 與C-H等鍵結受破壞,形成Si-H與C=O等鍵結,沉積出高度分支且交錯連結之薄膜。經歷UV 光誘導接枝聚合AAm後,由FTIR光譜可證明成功接枝,表面粗糙度下降至1-2nm,形成新的ㄧ層緻密有機薄膜。接枝後水接觸角由87°下降至36°,與玻璃之相對濕摩擦係數由0.25下降至0.2以下,有利生醫方面之應用。後續經歷固定肝素之處理後,可觀察到聚合鍵結之肝素分子形成之團聚物,且由XPS可偵測出S元素存在為肝素固定之證明。 SiC:H organic-like thin films are deposited on TiNi shape memory alloy (SMA) by DC-pulsed plasma enhanced chemical vapor deposition (PECVD) of HMDSN and Ar gas mixtures at room temperature. The organic-like thin films containing peroxides or free radicals can be subsequently grafted with hydrophilic polymer acrylamide (AAm) by UV-induced grafting polymerization. Heparin is immobilized onto grafted-AAm thin films to take TiNi SMA into the anti-thrombin biomaterials. The deposition rate of the plasma-polymerized HMDSN (PPHMDSN) thin film is fast and the root mean square surface roughness is between 2~4 nm. The PPHMDSN thin films not only enhance the corrosion resistance but make the corrosion current density decay four orders. Based on the micro-FTIR spectra, the Si-C and C-H bonds of the original HMDSN monomer are destroyed and new Si-H and C=O bonds are formed. The success of grafting is proved by FTIR. After grafting polymerization of AAm, a new dense organic thin films layer is formed in which the water contact angle decreases from 87° to 36° and the friction coefficient becomes lower. These properties are beneficial to the biomedical applications. According to XPS, the element S can be detected to prove that heparin is covalently immobilized on TiNi SMA. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24010 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 材料科學與工程學系 |
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ntu-95-1.pdf Restricted Access | 7.31 MB | Adobe PDF |
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