Batista André M, de Queiroz Thiago B, Antunes Renato A, Lanfredi Alexandre J C, Benvenho Adriano R V, Bonvent Jean J, Martinho Herculano
Universidade Federal do ABC Av. dos Estados 5001 Santo André-SP 09210-580 Brazil
RSC Adv. 2020 Oct 7;10(61):36980-36987. doi: 10.1039/d0ra05830k.
Confined and interstitial water has a key role in several chemical, physical and biological processes. It is remarkable that many aspects of water behavior in this regime (, chemical reactivity) remain obscure and unaddressed. In particular for gold surfaces, results from simulations indicated that the first wetting layer would present hydrophilic behavior in contrast to the overall hydrophobic character of the bulk water on this surface. In the present work we investigate the properties of confined water on Au 〈111〉 nanochannels. Our findings, based on a large set of morphological, structural and spectroscopic experimental data and computer simulations, strongly support the hypothesis of hydrophilicity of the first wetting layer of the Au 〈111〉 surface. A unique oxidation process was also observed in the nanochannels driven by confined water. Our findings indicated that the oxidation product is Au(OH). Therefore, the Au surface reactivity against confined water needs to be considered for nanoscopic applications such as, , catalysis in fine chemicals, pharmaceuticals, and the food industry green processes.
受限水和间隙水在若干化学、物理和生物过程中起着关键作用。值得注意的是，在这种情况下（如化学反应性）水行为的许多方面仍不清楚且未得到解决。特别是对于金表面，模拟结果表明，与该表面上大量水的整体疏水特性相比，第一润湿层将呈现亲水性行为。在本工作中，我们研究了金〈111〉纳米通道上受限水的性质。我们基于大量形态学、结构和光谱学实验数据以及计算机模拟得出的结果，有力地支持了金〈111〉表面第一润湿层具有亲水性的假设。在由受限水驱动的纳米通道中还观察到了独特的氧化过程。我们的研究结果表明，氧化产物是Au(OH)。因此，对于精细化学品、制药和食品工业绿色过程中的催化等纳米应用，需要考虑金表面对受限水的反应性。
