使用十八烷基三氯矽烷自組裝分子與大氣常壓噴射電漿進行FeCoNiCr中熵合金與纖維素紙的表面改質

Abstract

本研究分為兩部分。第一部分為使用氮氣直流脈衝常壓噴射電漿(DC-pulse atmospheric-pressure plasma jet)與十八烷基三氯矽烷自組裝分子(octadecyltrichlorosilane self-assembling monolayers, OTS SAM)對於鐵鈷鎳鉻中熵合金(FeCoNiCr medium-entropy alloy, FeCoNiCr MEA)進行表面改質，並進一步探討其對於抗腐蝕性質的影響。根據水接觸角實驗，常壓噴射電漿、十八烷基三氯矽烷自組裝分子或兩者都使用可以提升鐵鈷鎳鉻中熵合金的疏水性。透過極化曲線與電化學組抗分析，(Electrochemical Impedance Spectroscopy, EIS)，經過大氣電漿處理的鐵鈷鎳鉻中熵合金有最佳的抗腐蝕性。而在X-射線光電子光譜儀(X-ray photoelectron spectroscopy, XPS)的實驗結果中，常壓噴射電漿氧化了所有鐵鈷鎳鉻中熵合金中的金屬元素。然而，第二部分為使用大氣介電質放電噴射電漿(atmospheric-pressure dielectric-barrier-discharge jet, DBDjet)與十八烷基三氯矽烷自組裝分子以紙為基板製作紙基微流道，並使用水接觸角、X-射線光電子光譜儀(XPS)和表面輪廓儀等實驗探討其機制。在這個部分中，成功的蝕刻出一毫米寬的微流道。且兩種不同的液體可以在微流道中被傳輸或混合。

This study demonstrates two applications of atmospheric-pressure plasma jet. The first one is surface modification of FeCoNiCr medium-entropy alloy (MEA) using Octadecyltrichlorosilane (OTS) and DC-pulse atmospheric-pressure plasma jet (APPJ). Corrosion properties was investigated. According to contact angle measurements, engaging OTS-coating treatment, APPJ treatment, or the combination of both treatments (OTS-coated APPJ-treated) can improve the hydrophobicity of the FeCoNiCr MEA. The APPJ-treated FeCoNiCr MEA exhibits the best anti-corrosion properties, evidenced by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. APPJ treatment oxidizes all alloying elements of MEA, as revealed by X-ray photoelectron spectroscopy (XPS). The second part is the hydrophilic patterning of octadecyltrichlorosilane (OTS)-coated paper via atmospheric-pressure dielectric-barrier-discharge jet (DBDjet).Water contact angle measurement, X-ray photoelectron spectroscopy (XPS), and surface profilerwere used to characterize the DBDjet patterned OTS-coated paper. 1-mm-wide hydrophilic microstripes are patterned successfully, and liquids are successfully demonstrated to be transported and mixed in the hydrophilic microstripes.