表面曲率和润湿性对金纳米颗粒纳米泡形状和中空结构的影响

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Kueakul Khowamnuaychok , Chumphon Luangchaisri , Chivarat Muangphat
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引用次数: 0

摘要

本文讨论了非均相成核表面的形状如何影响氢纳米泡的形成,并将其用于制备金纳米粒子的中空结构。氢纳米泡在电化学过程中产生氢原子,通过过饱和机制成核和生长。圆柱形阳极氧化铝(AAO)孔的凹面有利于氢纳米气泡的均匀成核,而不需要三相接触线。这使得AAO孔可用作模板,通过歧化反应和无电法合成球形空心金结构(HAuNPs)。相比之下,聚二甲基硅氧烷(PDMS)在电化学芯片上的平坦表面由于其低相互作用能,可以用来制造球形的氢纳米气泡和碗状的金纳米粒子(BAuNPs)。此外,可以通过改变表面润湿性来调整BAuNPs的形状,而表面润湿性与水接触角有关。与亲水性衬底相比,疏水衬底对氢纳米泡产生更小的接触角。然而,纳米氢泡接触角的变化量远小于衬底水接触角的变化量。此外,随着衬底水接触角的增大,氢纳米泡的尺寸减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of surface curvature and wettability on the shape of nanobubble and hollow structure of gold nanoparticles

Effect of surface curvature and wettability on the shape of nanobubble and hollow structure of gold nanoparticles
This report discusses how the shape of the heterogeneous nucleation surface affects the formation of hydrogen nanobubbles, which are used in fabricating the hollow structure of gold nanoparticles. The hydrogen nanobubbles nucleate and grow through a supersaturation mechanism where hydrogen atoms are generated during the electrochemical process. The concave surface of a cylindrical anodic aluminum oxide (AAO) pore facilitates the homogeneous nucleation of hydrogen nanobubbles without the need for a three-phase contact line. This makes AAO pores useful as templates for synthesizing spherical hollow gold structures (HAuNPs) via a disproportionation reaction and electro less process. In contrast, the flat surface of polydimethylsiloxane (PDMS) on the electrochemical chip can be utilized to produce spherical caps of hydrogen nanobubbles and bowl-shaped gold nanoparticles (BAuNPs) due to its low interaction energy. Additionally, the shape of BAuNPs can be adjusted by modifying the surface wettability, which is related to the water contact angle. A hydrophobic substrate produces a smaller contact angle for hydrogen nanobubbles compared to hydrophilic substrates. However, the variation in the contact angle of hydrogen nanobubbles is much less than the change in the water contact angle of the substrate. Furthermore, as the water contact angle of the substrate increases, the size of the hydrogen nanobubbles decreases.
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来源期刊
Surfaces and Interfaces
Surfaces and Interfaces Chemistry-General Chemistry
CiteScore
8.50
自引率
6.50%
发文量
753
审稿时长
35 days
期刊介绍: The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)
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