有效防污和抗菌表面的电化学方法,ACS Applied Materials & Interfaces

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有效防污和抗菌表面的电化学方法
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-07-31 00:00:00 , DOI: 10.1021/acsami.7b03761
Sheng Long Gaw ₁ , Sujoy Sarkar ₂ , Sivan Nir ₂ , Yafit Schnell ₂ , Daniel Mandler ₂ , Zhichuan J. Xu ₁ , Pooi See Lee ₁ , Meital Reches ₂

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今天，生物污垢是生物在表面的吸附，是当今我们生活中许多领域的主要问题。其中包括：（i）健康，因为医疗设备上的生物污垢会导致医院获得感染，（ii）水，因为海水淡化系统中膜和管道上的生物积累会损害系统功能，并且（iii）能源，由于积聚在海洋船舶上的有机层的重负荷，会导致更大的燃料消耗。本文提出了一种有效的电化学方法来产生防污和抗菌表面。与先前报道的防污或抗菌电化学研究不同，我们证明了通过向导电表面施加低压方波脉冲来形成氢气气泡层。这种电化学产生的气泡层在周围环境和目标表面之间起着隔离层的作用，可以阻止细菌的粘附。我们的结果表明，这种屏障可以有效地减少99.9％的细菌对表面的吸附。我们提出，抗菌机制与氢释放反应（HER）的基本原理有关。HER导致一个干旱的环境，不允许存在活细菌。另外，我们表明，这种干旱条件由于水分胁迫而杀死了表面上的预先附着的细菌。这项工作为探索未来的自持式防污技术（例如将其与光催化和光电化学反应结合）奠定了基础。

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Electrochemical Approach for Effective Antifouling and Antimicrobial Surfaces

Biofouling, the adsorption of organisms to a surface, is a major problem today in many areas of our lives. This includes: (i) health, as biofouling on medical device leads to hospital-acquired infections, (ii) water, since the accumulation of organisms on membranes and pipes in desalination systems harms the function of the system, and (iii) energy, due to the heavy load of the organic layer that accumulates on marine vessels and causes a larger consumption of fuel. This paper presents an effective electrochemical approach for generating antifouling and antimicrobial surfaces. Distinct from previously reported antifouling or antimicrobial electrochemical studies, we demonstrate the formation of a hydrogen gas bubble layer through the application of a low-voltage square-waveform pulses to the conductive surface. This electrochemically generated gas bubble layer serves as a separation barrier between the surroundings and the target surface where the adhesion of bacteria can be deterred. Our results indicate that this barrier could effectively reduce the adsorption of bacteria to the surface by 99.5%. We propose that the antimicrobial mechanism correlates with the fundamental of hydrogen evolution reaction (HER). HER leads to an arid environment that does not allow the existence of live bacteria. In addition, we show that this drought condition kills the preadhered bacteria on the surface due to water stress. This work serves as the basis for the exploration of future self-sustainable antifouling techniques such as incorporating it with photocatalytic and photoelectrochemical reactions.

更新日期：2017-07-31

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