【摘要】 固-液界面粘附作用是影响液相在固体表面动态性能的关键因素,降低固-液界面粘附力是疏液表面迈向实际应用的关键突破点。为探讨固相表面微观结构对固-液界面粘附作用的影响,采用高粘低表面张力液相端羟基聚丁二烯(HTPB)为主要指示液相,通过反应溶液和条件控制来调控固相表面的微观结构和形貌,制备疏液表面,并利用接触角仪、高精度天平和高速摄像等手段研究HTPB在疏液表面的静态接触角和动态粘附-脱附过程行为,揭示降低固-液界面粘附作用的微观结构调整方向。结果表明,固相微观结构在一定程度的变化对静态接触角影响较小,但对HTPB在脱附过程中液滴的形变产生较大影响,同时对比研究了低粘高表面张力液相水和甘油在疏液表面的动态粘附-脱附行为和粘附力值,通过力学物理模型简化,表明固-液界面的粘附力除了与液滴形状的变形量和本质特性紧密关联,还取决于固相表面微观结构。通过固相表面微观结构对界面粘附力的影响特性,认为构筑的微观结构更均匀致密,三维(X\Y\Z)方向上尺寸均实现纳米、亚微米到微米的连续性跨越时,可使固-液界面粘附力显著下降。更多还原

【Abstract】 Solid-liquid interfacial adhesion is a key factor for the dynamic performance of the liquid on the solid surface.Low interfacial adhesion will improve the practical application for the hydrophobic surface.To discuss the effect of micro-structure of solid surface on the interfacial adhesion,the study in this paper used hydroxylterminated polybutadiene(HTPB)as the probing liquid with high viscosity and low surface tension to prepare the hydrophobic surfaces with different surface morphologies by controlled the reaction conditions.Then the static contact angles and dynamic adhesion-separation processes between HTPB and hydrophobic surfaces were investigated by the contact angle system,force tensiometer,high speed video,and so on.When the microstructure on solid surface changed in the range,the static contact angle of HTPB could have no obvisous difference,but the shape of HTPB droplet could be large different in dynamic separating process.Meanwhile,the dynamic processes and adhesion forces between water/glycerine and hydrophobic surfaces were measured for the comparation.The results showed that the interfacial adhesion force was closely decided with liquid property and micro-structure on solid surface.According to the influence of the surface microstructure of solid phase on the interfacial adhesion force,it was considered that the structure of solid-liquid interface was more uniform and dense.When the dimension of three-dimensional(X\Y\Z)direction realized nanometer,submicron and micrometer continuous three-dimensional display,the solid-liquid interfacial adhesion could be obviously decreased.更多还原