激光制备润湿性梯度Janus网对水下气泡的单向自发运输

Wettability gradient Janus mesh prepared by laser for the unidirectional spontaneous transport of under-water bubble

特殊润湿性表面的水下气泡操控因在工业生产中具有潜在的应用而受到极大关注.通过激光烧蚀、表面化学修饰、修饰剂去除、热板退火调控润湿性等工艺制备了润湿性梯度可控的Janus网,并通过监测水下气泡单向自发运输的动态过程,研究了该Janus网表面润湿性及微孔尺寸对水下气泡单向自发运输的影响.结果表明:Janus网上下表面为超疏水/亲水、疏水/亲水或超疏水/疏水时,均具有气泡单向自发输送能力;微孔尺寸越小、上下表面间润湿性梯度越大越有利于气泡单向自发运输.此外,对气泡单向自发运输的物理机制和影响因素进行分析,为梯度润湿性金属网的制备提供了理论依据.

Underwater bubble operation on special wetting surfaces has attracted wide attention due to its potential applications in industrial production.In this study,we have generated a wettability gradient aluminum Janus mesh by means of laser ablation,surface chemical modification and subsequent modifier removal,and wettability modulation through hot plate annealing.We also examine the effect of the wettability of the Janus mesh and its micropore size on under-water unidirectional air penetration by monitoring the dynamic process of the unidirectional spontaneous transport of under-water bubble.The results show that the two sides of Janus mesh are hydrophilic/superhydrophobic,hydrophilic/hydrophobic or hydrophobic/superhydrophobic,all of which claim the ability of spontaneous unidirectional air penetration.The smaller pore size and the higher wettability gradient between the upper and the lower surfaces,the better effect for spontaneous unidirectional bubble transport.In addition,the physical mechanism and influencing factors of unidirectional spontaneous air penetration are analyzed,and the practicability of Janus mesh is also proved by gas collection experiments.