【作者】 尚广瑞；

【导师】 任露泉；

【作者基本信息】 吉林大学 ， 农业机械化工程， 2007， 博士

【摘要】 金属表面润湿性能的研究是当今世界范围内的科研热点和难点。具有疏水能力的金属表面,可以减小水的流动阻力,从而降低输送成本。或者,在相同动力下,提高舰船水面航行速度或提高载重量;具有超疏水能力的金属表面可以实现自清洁,从而提高其抗污染、抗腐蚀的能力;提高金属表面的亲水能力,可以增强金属表面与工作介质的亲和度。不论是使金属表面由亲水转为疏水甚至超疏水,或使金属表面亲水能力增强,都具有重要的研究意义。本文从工程仿生学出发,以铜-锌合金及不锈钢为研究对象,通过制备仿生耦合表面,改善其表面润湿性能并获得成功。主要工作包括:1.应用纳米制造技术,利用大孔模板,在铜-锌合金表面制备形态、结构与高表面能材料三元仿生耦合表面,实现了铜-锌合金表面由亲水向疏水的转变。实际接触角由亲水状态的82.5°提高到疏水状态的126.1°,滚动角小于5°。2.应用化学修饰技术,在铜-锌合金表面制备形态、结构及低表面能材料三元仿生耦合表面,实现了铜-锌合金表面由疏水向超疏水的转变。实际接触角达到161.3°,滚动角小于4.6°。3.应用激光掩膜微细加工技术,在铜-锌合金表面制备几何非光滑形态仿生表面,实现了铜-锌合金表面亲水能力增加,实际接触角由光滑表面的82.5°减小到31.5°,并建立了表面单元体特征参数与实际接触角关系的非线性数学模型。4.应用激光精细加工技术,在不锈钢表面制备几何非光滑形态仿生表面,实现了不锈钢表面亲水能力增加,实际接触角由光滑表面的84°减小到60.1°。更多还原

【Abstract】 In this article, the key work is to have the wettability of representative metal:Cu-Zn Alloyl surface improved.Many biology in nature show special wettability because of unique shape, structure on their skin and the difference of materials between body and outside surface when experienced millions of millions years evolution, such as duck belly feather shows superhydrophobicy as the interaction between spine barbs and surface lipoid; On the other side, some biology show superhydroplibicy. In the view of bionics, it is the result of coupling with modality, structure and materials.The research for solid surface wettabiltyt is focus on two directions: To make the hydrophilic surface change into hydrophobic or superhydrophobic surface or to make the hydrophilic capacity increase. Many progress have been made by constructing modality, structure and material bionic coupling surface in nonmetal area.Three ways were used to make hydrophilic metallic surface change to be hydrophobic surface: (1) To fabricate micro-nanometer scale nonsmooth modality. The first step is making self-assembly template, then depositing metal in the gap, at last removing template. The successful work is on Au surface by Mamdouh E.Abdelsalam. No report has been found in China. (2) To fabricate superhydrophobic metallic surface through the interaction of shape and material. Main ways include chemical eroding, anode oxidation, laser etching and so on. Then the low surface energy material was used to make a thin film on the surface. In this way, the duality bionic coupling surface was made, the metallic surface may be superhudrophobic; (3) To create new matter by chemical reaction.Opposite above, to make the capability increase by copying shape of biology skin come true, the main factors are had the contact area increased.On the hydrophobic metallic surface, water resistance would be low, bear the weight of ship or the velocity would be increase at the same cost or power; On the superhydrophobic surface, self-cleaning, anti-eroding, antipollution would be true. Hydrophilic metallic surface could be used at medicine, industry and so on. Up to now, research for wettability of metal has been the rush area in the world.Cu ? ZnAlloy and stainless steel is a kind of important industrial raw and processed material, It has been widely used to make pipeline, shafting and high strength parts of automobile and ship.In this work, we use laser photography, laser fine processing and nanometer technology to fabricate modality, structure duality bionic coupling metallic surface and modality, structure and material ternary bionic coupling metallic surface. By this way, Cu ? ZnAlloy surface is from hydrophilic to superhydrophobic successfully. On the other hand, Cu ? ZnAlloy and stainless steel surface hydrophilic capability increase by fabricating geometry non-smooth shape bionic surface. By our work, two directions progress are made.1.Geometry non-smooth shape has been fabricated by means of Patankar model on Cu ? ZnAlloy and apparent contact was test. It has been shown that the hydrophilic capability increase 62% or the apparent contact angle decrease from 82.5°to 31.5°. Linearity tropical equation is below Yi = 28 .0532+0.1730X1i +0.1918X2i+1.1165X3i+εiAmong factors a(x2i),b(x1i),H(x3i), the key factor is H. Even ifβ≥0.0632, hydrophilic surface can not change to be hydrophobic surface. Nonlinear mathematics model is belowForce model. When a droplet sits on a solid surface, thenWhere, cosθ* denotes apparent contact, R 0 denotes the radius of sphere water droplet,γdenotes surface tension, Px denotes efficiency force to water droplet, T denotes temperature, p denotes environment press, k is a coefficient, d denotes the distance between two molecules.2. To make Self-assembling model on Cu - ZnAlloy surface, then deposit pure Cu to the model interval, fabricate shape, structure and high surface energy material ternary bionic coupling metallic surface. Cu - ZnAlloy surface is changed from hydrophilic to hydrophobic. The apparent contact angle increases from 82.5°to 126.1°or increases 53%; The sliding angle is about 5°. In the process of fabricating bionic coupling surface, the key factor is the radioξand the solid area fractionΦs.The change of apparent contact is close to Cassis-Baxter model, it is not keeping step with Wenzel model. Function of pure Cu is fabricating non-smooth shape and composite structure.3. On the basis of above work, to fabricate shape, structure and low surface energy material ternary bionic coupling metallic surface. Cu - ZnAlloy surface is changed to be superhydrophobic. The apparent contact angle increases from 82.5°to 161.3°; The sliding angle is about 4.6°.4. Non-smooth stainless steelbionics surface has been fabricated by laser fine processing and hydrophilic capability has been increased 28.8%. The relationship between roughness factor r and apparent contact angleθ* isThe relationship betweenΦs apparent contact angleθ* is更多还原