电解微气泡生长行为及驻留稳定性

分析微凹坑、疏水涂层及电解规范对于微气泡生长行为及驻留稳定性的影响和作用机制,实现自适应电解微气泡启停控制及稳定驻留.制备壁面聚酰亚胺绝缘涂层底面Pt电极微凹坑电解试片,进行普通及疏水壁面电解微气泡静水观测试验.研究结果表明:电解试片可实现电解微气泡启停控制及稳定驻留;电解微气泡从形核位点开始生长,疏水壁面可形成更多形...

Growth Behaviors and Resident Stability of Electrolyzed Microbubble

The influences of micro-pits, hydrophobic coating and electrolysis specifications on the growth behaviors and resident stability of the electrolyzed microbubbles are analyzed to achieve the adaptive start-stop control and stable residence of electrolyzed microbubble. The electrolytic test pieces with polyimide insulation surface and Pt bottom electrode were manufactured, and the observational experiments of electrolyzed microbubbles with normal and hydrophobic wall surfaces in the static water were made. The research results show that the adaptive start-stop control and stable residence of electrolyzed microbubbles in the micro-pits on electrolytic test piece can be achieved. The electrolyzed microbubbles start generating at the nucleation points, and more nucleation points are formed on the hydrophobic surface to accelerate the microbubble growth. The increased NaCl concentration from 0.5 % to 3.5 % would reduce the voltages of starting microbubble electrolysis on normal and hydrophobic wall surfaces by 4.43% and 2.31%, respectively. The increased NaCl concentration from 0.5 % to 2.5 % would also reduce the voltages of filling micro-pits on normal and hydrophobic wall surfaces, but the voltages of filling micro-pits turn to be constant as the NaCl concentration is greater than 2.5 %. The electrolytic voltage is increased to directly stimulate the combinations of H ions and electrons, thus significantly accelerating the electrolyzed microbubbles to inflate to the stable diameter. Under the same experimental conditions, the hydrophobic surface would lead to the greater stable diameter of microbubble to shorten the time to reach the stable diameter, and the resident stability of microbubble is improved using a greater contact angle θ.