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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Singlet Oxygen Generation on Porous Superhydrophobic Surfaces: Effect of Gas Flow and Sensitizer Wetting on Trapping Efficiency
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Singlet Oxygen Generation on Porous Superhydrophobic Surfaces: Effect of Gas Flow and Sensitizer Wetting on Trapping Efficiency

机译：多孔超疏水表面上单线态氧的产生：气体流量和敏化剂润湿对捕集效率的影响

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摘要

We describe physical-organic studies of singlet oxygen generation and transport into an aqueous solution supported on superhydrophobic surfaces on which silicon? phthalocyanine (Pc) particles are immobilized. Singlet oxygen (~1O_2) was trapped by a watersoluble anthracene compound and monitored in situ using a UV?vis spectrometer. When oxygen flows through the porous superhydrophobic surface, singlet oxygen generated in the plastron (i.e., the gas layer beneath the liquid) is transported into the solution within gas bubbles, thereby increasing the liquid?gas surface area over which singlet oxygen can be trapped. Higher photooxidation rates were achieved in flowing oxygen, as compared to when the gas in the plastron was static. Superhydrophobic surfaces were also synthesized so that the Pc particles were located in contact with, or isolated from, the aqueous solution to evaluate the relative effectiveness of singlet oxygen generated in solution and the gas phase, respectively; singlet oxygen generated on particles wetted by the solution was trapped more efficiently than singlet oxygen generated in the plastron, even in the presence of flowing oxygen gas. A mechanism is proposed that explains how Pc particle wetting, plastron gas composition and flow rate as well as gas saturation of the aqueous solution affect singlet oxygen trapping efficiency. These stable superhydrophobic surfaces, which can physically isolate the photosensitizer particles from the solution may be of practical importance for delivering singlet oxygen for water purification and medical devices.
机译：我们描述了物理有机的单线态氧的产生和迁移到支撑在超疏水表面上的水溶液中的研究，该表面上有哪些硅？酞菁（Pc）颗粒被固定。单线态氧（〜1O_2）被水溶性蒽化合物截留，并使用紫外可见光谱仪进行现场监测。当氧气流过多孔的超疏水表面时，在中生成的单重态氧（即，液体下方的气体层）被输送到气泡内的溶液中，从而增加了可捕获单重态氧的液-气表面积。与the气中的气体为静态时相比，在流动的氧气中实现了更高的光氧化速率。还合成了超疏水表面，使Pc颗粒与水溶液接触或分离，以分别评估溶液和气相中产生的单线态氧的相对有效性;即使在流动的氧气存在下，在溶液润湿的颗粒上产生的单重态氧也比在plast纶中产生的单重态氧更有效地被捕获。提出了一种机制，解释了Pc颗粒的润湿，塑料气体的组成和流速以及水溶液的气体饱和度如何影响单线态氧的捕集效率。这些稳定的超疏水表面可以将光敏剂颗粒从溶液中物理隔离出来，对于为水净化和医疗设备输送单线态氧可能具有实际意义。

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