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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Influence of Titanium Surface Treatment on Adsorption of Primary Amines
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Influence of Titanium Surface Treatment on Adsorption of Primary Amines

机译：钛表面处理对伯胺吸附的影响

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摘要

The influence of acid-base properties of titanium (T35) on the adsorption of model amine molecules as a function of surface treatments, necessary for modification of surface morphology and its chemical composition, has been investigated by X-ray photoelectron spectroscopy. A significant increase in the surface energy measured by contact-angle measurements has been observed after surface treatment (thermal, chemical treatment in alkali electrolyte, and electrochemical treatment: anodization) compared with the pristine sample (+75% on average). An important modification of surface morphology was observed by scanning electron microscopy ) after the electrochemical (anodization) and chemical treatment of Ti resulting in formation of TiO2 nanotubes and porous TiO2 surface, respectively. Two amine molecules have been chosen to study the adsorption in a function of Ti surface treatment: propylamine (PPA) and 1,2-diaminoethane (DAE). The increased intensities of N1s and C1s core level peaks indicate a stronger adsorption of DAE than PPA molecule on all type of titanium surfaces. The layer thickness of amines ranged between 0.6 and 0.8 nm and 0.9 and 1.5 nm for PPA and DAE molecule, respectively. It has been shown that higher hydroxyl fraction results in the formation of thicker amine layer. The surface hydroxylation also had an influence on the Bransted/Lewis distribution. A higher Bronsted interaction was observed with higher surface hydroxylation. For both amines and for all treated surfaces, adsorption occurred in majority via a Lewis-like interaction.
机译：通过X射线光电子能谱研究了钛（T35）的酸碱性质对模型胺分子吸附的影响，这是表面处理功能的改变，而表面处理是改变表面形态及其化学组成所必需的。与原始样品相比，表面处理（热处理，碱电解液中的化学处理和电化学处理：阳极氧化）后，通过接触角测量法测得的表面能显着增加（平均+ 75％）。在对钛进行电化学（阳极氧化）和化学处理后，通过扫描电子显微镜观察到了表面形态的重要变化，分别形成了TiO2纳米管和多孔TiO2表面。选择了两个胺分子来研究Ti表面处理功能的吸附：丙胺（PPA）和1,2-二氨基乙烷（DAE）。 N1s和C1s核心水平峰强度的增加表明，在所有类型的钛表面上，DAE的吸附均比PPA分子强。对于PPA和DAE分子，胺的层厚度分别在0.6至0.8nm和0.9至1.5nm之间。已经表明，较高的羟基分数导致形成较厚的胺层。表面羟基化也对Bransted / Lewis分布有影响。观察到更高的布朗斯台德相互作用和更高的表面羟基化。对于胺类和所有处理过的表面，大多数吸附都是通过类似路易斯的相互作用发生的。

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