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首页> 外文期刊>Chemistry: A European journal >Quantitative Determination and Comparison of the Surface Binding of Phosphonic Acid, Carboxylic Acid, and Catechol Ligands on TiO2 Nanoparticles
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Quantitative Determination and Comparison of the Surface Binding of Phosphonic Acid, Carboxylic Acid, and Catechol Ligands on TiO2 Nanoparticles

机译：TiO2纳米颗粒上磷酸，羧酸和邻苯二酚配体表面结合的定量测定和比较

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摘要

The adsorption, desorption, co-adsorption, and exchange behavior of phosphonic acid, carboxylic acid, and catechol derivatives on the surface of titanium oxide (anatase) nanoparticles are investigated. Thermogravimetric analysis provides a facile and fast-track quantitative determination of the wet-chemical monolayer adsorption constants and grafting densities of ten adsorbates, all under neutral pH conditions. This characterization protocol allows straightforward quantification of the relevant thermodynamic data of ligand adsorption and a comparison of ligand adsorption strengths. The reported procedure is proposed as a universal tool and it should be applicable to many other colloidal metal oxide materials. Moreover, the determined values for the adsorption constants and the monolayer grafting densities provide a toolbox for the assessment of the adsorbates' behavior in desorption, exchange, and co-adsorption equilibria. This versatile evaluation procedure will help to identify optimal monolayer-surface combinations and to evaluate critical parameters, such as monolayer robustness, ligand exchange rates, or targeted mixed assembly of functionalities.
机译：研究了膦酸，羧酸和邻苯二酚衍生物在氧化钛（锐钛矿）纳米颗粒表面的吸附，解吸，共吸附和交换行为。热重分析提供了在中性pH条件下湿化学单层吸附常数和十种被吸附物的接枝密度的便捷，快速定量方法。该表征方案允许对配体吸附的相关热力学数据进行直接定量，并比较配体吸附强度。所报道的方法被提议作为通用工具，并且应适用于许多其他胶体金属氧化物材料。此外，确定的吸附常数和单层接枝密度值为评估被吸附物在解吸，交换和共吸附平衡中的行为提供了一个工具箱。这种通用的评估程序将有助于确定最佳的单层表面组合，并评估关键参数，例如单层坚固性，配体交换率或目标性的功能性混合组装。

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