發(fā)布時(shí)間：2018-03-17 00:22

  本文選題：飛秒激光　切入點(diǎn)：微納結(jié)構(gòu)　出處：《長(zhǎng)春理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：飛秒激光在金屬表面可實(shí)現(xiàn)多種微納結(jié)構(gòu)的直接制備,這些微納結(jié)構(gòu)可使其表面具備優(yōu)良的潤(rùn)濕性,實(shí)現(xiàn)親水或疏水功能。基于這些功能特性,使其在航天、建筑、醫(yī)學(xué)以及太陽(yáng)能等諸多領(lǐng)域具有重要的應(yīng)用價(jià)值。本文分別對(duì)飛秒激光制備親水或疏水微納結(jié)構(gòu)表面進(jìn)行了研究。在親水性研究方面,利用聚焦飛秒激光脈沖在金屬表面制備了溝槽形微納結(jié)構(gòu)。研究發(fā)現(xiàn),在激光離焦位置可實(shí)現(xiàn)小于焦點(diǎn)燒蝕溝槽區(qū)域的微小溝槽制備(焦點(diǎn)光斑處制備溝槽寬度約為120μm,離焦位置處微小溝槽寬度約為70μm),這一發(fā)現(xiàn)對(duì)于溝槽形微納結(jié)構(gòu)的制備及優(yōu)化具有重要的應(yīng)用意義。進(jìn)一步通過(guò)聚焦激光的光譜監(jiān)測(cè)結(jié)果證實(shí)了產(chǎn)生這一現(xiàn)象的原因與飛秒激光聚焦過(guò)程中擊穿空氣產(chǎn)生等離子絲的非線性現(xiàn)象有關(guān)。通過(guò)對(duì)親水性表征發(fā)現(xiàn),所制備溝槽微納結(jié)構(gòu)表面接觸角典型值約為11°,具備超親水特性。同時(shí)吸入的水可逆重力方向沿溝槽定向流動(dòng),運(yùn)動(dòng)平均速度最快可達(dá)21.6mm/s。水的逆重力輸運(yùn)符合擴(kuò)散定律,產(chǎn)生這一現(xiàn)象的原因可歸結(jié)于開(kāi)放腔毛細(xì)管效應(yīng)。在疏水性研究方面,利用聚焦飛秒激光脈沖在金屬鎳表面進(jìn)行低于聚焦光斑尺寸掃描間距的聚焦掃描,經(jīng)過(guò)均勻激光輻照,在其表面制備出了柱形雙尺度微納復(fù)合結(jié)構(gòu)。研究發(fā)現(xiàn),鋼、鈦合金及純銅為樣品所制備的微納結(jié)構(gòu)表面不會(huì)出現(xiàn)文獻(xiàn)中報(bào)道的在空氣中可實(shí)現(xiàn)從親水性向疏水性的自然轉(zhuǎn)變。激光制備微納結(jié)構(gòu)表面經(jīng)過(guò)硅烷化處理后,可展現(xiàn)出疏水特性,其疏水角可達(dá)148.28°。這一發(fā)現(xiàn),對(duì)于飛秒激光制備金屬潤(rùn)濕性微納結(jié)構(gòu)表面的基材選擇具有應(yīng)用意義。
[Abstract]:Femtosecond lasers can be directly prepared on metal surfaces with a variety of micro and nano structures that allow their surfaces to have excellent wettability, hydrophilic or hydrophobic functions. Many fields such as medicine and solar energy have important application value. In this paper, the surface of hydrophilic or hydrophobic micro-nano structures prepared by femtosecond laser has been studied respectively. Grooves and nanostructures were fabricated on metal surfaces by focusing femtosecond laser pulses. The fabrication of micro-grooves smaller than that of focal ablation grooves can be realized at the laser defocusing position (the width of the prepared grooves at the focal spot is about 120 渭 m, and the width of the micro-grooves at the defocus positions is about 70 渭 m). The preparation and optimization are of great significance in application. The results of spectral monitoring of focusing laser confirm that the cause of this phenomenon and the nonlinear phenomenon of plasma wire produced by air breakdown in the process of femtosecond laser focusing. Through the characterization of hydrophilicity, The surface contact angle of the grooved micro / nano structure is about 11 擄, which has super hydrophilic property. At the same time, the reversibly gravity direction of the inhaled water flows along the trench directional direction, and the average velocity of movement can be as fast as 21.6 mm / s. The reverse gravity transport of water obeys the law of diffusion. In hydrophobicity research, focused femtosecond laser pulses are used to scan the nickel metal surface with a scanning distance below the size of the focal spot, which is irradiated by a uniform laser, the reason of which can be attributed to the open cavity capillary effect. A columnar double scale micro / nano composite structure was prepared on its surface. The surface of micro-nano structure prepared by titanium alloy and pure copper will not change from hydrophilicity to hydrophobicity in air as reported in the literature. The hydrophobic property can be shown, and the hydrophobic angle is up to 148.28 擄. This discovery is of great significance for the selection of substrate for the fabrication of the surface of metal wettable micro-nano structure by femtosecond laser.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN249

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