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通过离子调节在空气-液体界面吸附纳米颗粒向增强的性TiO₂

Xiaowei Hu¹, Shangan Chen¹, Heqing Jiang^1,2

¹College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.

Langmuir : the ACS journal of surfaces and colloids

|November 12, 2024

概括

这项研究表明,将盐 (NaCl) 添加到水友性二氧化 (TiO2) P25悬浮液中,可以增强空气-液体界面的颗粒吸附. 最佳的盐度可以改善颗粒活性和界面包装.

科学领域:

材料科学材料科学材料科学
表面化学表面化学
体科学体科学体科学

背景情况:

水友性二氧化 (TiO2) P25颗粒由于其超水友性而表现出有限的空气-液体界面吸附.
了解粒子界面相互作用对于涉及悬浮和乳液的应用至关重要.

研究的目的:

为了研究水友性TiO2 P25.5的动态界面张力.
阐明受离子调节影响的TiO2颗粒的界面吸附机制.
通过控制表面电荷和离子度来优化颗粒吸附.

主要方法:

吊掉落法用于测量动态界面张力.
分析了TiO2粒子的表面电荷分布.
不同化 (NaCl) 度对颗粒吸附的影响经过实验确定.

主要成果:

没有NaCl,TiO2 P25显示最小的界面吸附,无论粒子度.
添加NaCl增加了粒子表面电荷密度,增强了静电吸引力,增强了吸附.
低NaCl度 (0.01重量%) 优化了颗粒活性和界面包装密度.
较高的NaCl度 (0.1重量%) 导致包装密度较低,尽管吸附度增加,由于粒子面积效应.

结论:

离子调节,特别是NaCl的添加,是一种有效的策略,可以增强水友性TiO2 P25颗粒的界面吸附.
NaCl的度极大地影响了粒子吸附行为和界面包装.
控制表面电荷和粒子面积是操纵TiO2 P25吸附量身定制界面特性的关键.

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