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首页> 外文会议>Second International Symposium on Contact Angle, Wettability and Adhesion; Jun 21-23, 2000; Newark, New Jersey >Surface properties of fatty amines as revealed by contact angle, FTIR, and AFM measurements
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Surface properties of fatty amines as revealed by contact angle, FTIR, and AFM measurements

机译：通过接触角，FTIR和AFM测量揭示的脂肪胺的表面性质

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摘要

Fatty amines are widely used as collectors in the flotation of non-sulfide minerals. It is believed that at higher pH and/or higher concentration precipitation of the collector colloid as free amine may occur at the surface of the floated mineral. In the present work, we studied the wetting characteristics of the dodecylamine, hexadecylamine and octadecylamine surfaces at pH 6.4 and pH 9.0 using the sessile drop and captive bubble techniques. An increase in hydrophobicity with time was observed for each amine. Additionally, the FTIR thin film transmission spectra for these amines were taken as a function of time. Evident changes in the intensity and frequency of characteristic bands, especially NH vibrations were observed. Based on the contact angle and FTIR results it was concluded that hydrocarbon chain rearrangement associated with recrystallization took place at the surface during contact with the air. In order to examine the changes in these surface features, AFM images were collected. The most significant changes caused by crystal growth were observed at the dodecylamine surface. Moreover, the microscopic roughness was highest for the dodecylamine surface.
机译：脂肪胺被广泛用作非硫化矿物浮选中的捕收剂。据信，在较高的pH和/或较高的浓度下，作为游离胺的捕收剂胶体的沉淀可能在漂浮的矿物的表面上发生。在目前的工作中，我们使用无滴和俘获气泡技术研究了pH 6.4和pH 9.0时十二烷基胺，十六烷基胺和十八烷基胺表面的润湿特性。观察到每种胺的疏水性随时间增加。另外，将这些胺的FTIR薄膜透射光谱作为时间的函数。观察到特征带的强度和频率发生明显变化，尤其是NH振动。根据接触角和FTIR结果得出结论，与重结晶有关的烃链重排发生在与空气接触的表面上。为了检查这些表面特征的变化，收集了AFM图像。在十二烷基胺表面观察到由晶体生长引起的最显着变化。此外，十二烷基胺表面的显微粗糙度最高。

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