耐久超亲水表面制备及在降膜传质中的应用

Preparation of durable super-hydrophilic surface and application in falling-film mass transfer

该文针对降膜气液传质过程,设计了耐久超亲水塑料填料制备及应用的研究型本科生实验。首先分析了影响降膜传质的主要因素,通过溶胶-凝胶法制备了超亲水二氧化硅涂层,并对塑料表面预刻蚀微结构及制备有机-无机杂化膜粘结剂提升耐久性;通过接触角测试、SEM、连续冲刷及打磨等进行表征;并结合溶液除湿装置验证了应用该改性表面具提升除湿效率近2倍的效果。该实验涉及理论分析、材料制备、表征和性能评价等多个实践环节,涵盖物理化学、流体力学、传热传质等多个学科。实践表明:该实验可以提高学生对理论知识点及基本实验技能的综合应用,有利于激发学生科研兴趣,培养创新和解决实际问题的能力。

A research-oriented undergraduate experiment is designed to prepare and apply durable super-hydrophilic surfaces of plastic fillers for the falling film gas-liquid process.The experiment first analyzes the main factors affecting the falling film mass transfer.The super-hydrophilic silica coating is prepared by the sol-gel method.The plastic surface is etched with the microstructures,and pretreated with self-developed organic-inorganic hybrid film adhesives to improve durability.The samples are characterized by the contact angle test,SEM,continuous scouring and polishing durability tests.It is proved that by applying the modified surface,the dehumidification efficiency of a practical dehumidifier can be increased by nearly twice.The experiment involves multiple practical links,such as theoretical analysis,material preparation,characterization and performance evaluation,and covers multiple disciplines,such as physical chemistry,fluid mechanics,heat and mass transfer.Practice shows that the experiment can improve students'comprehensive application of theoretical knowledge and basic experimental skills,and is very useful for stimulating students'interest in scientific research and solving practical problems.