Comparison of surface energy and adhesion energy of surface-treated particles
Comparison of surface energy and adhesion energy of surface-treated particles
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DOI：
10.1016/j.powtec.2021.02.029
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发表时间：
2021-02-25
影响因子：
5.2
通讯作者：
Romkes, Albert
中科院分区：
文献类型：
--
作者：
Sansao, Bernardo Moreno Baqueiro;Kellar, Jon J.;Romkes, Albert
采矿业每年在矿石加工过程中使用大量的水。因此，与矿石加工有关的可持续做法至关重要。本文所述的项目是基于控制和利用粘附力生产干燥颗粒分离工艺的第一步。在这项研究中，目标是确定颗粒的表面能，并进一步确定固体表面能是否可以用来了解这些颗粒与表面改性基材之间的粘附力。玻璃球被选择来代表硅酸盐矿物，这是在矿床中发现的最丰富的矿物类型。通过使用接触角测量和通过应用货车Oss-Good-Chaudhury（VOGC）方法发现固体表面能。VOGC方法利用三种液体三元组来确定Lifshitzvan der Waals、刘易斯酸和刘易斯碱表面能组分。等离子体清洁的玻璃的表面能在40.2和60.2 mJ/m（2）之间;对于疏水化学表面处理的相同玻璃，三氯甲烷的表面能在100 mJ/m（2）和100 mJ/m（2）之间。十八烷基硅烷（TCOD）的表面能在20.8 ~ 20.9mJ/m2之间;并且对于具有亲水性化学表面处理的玻璃（n（1）-（3-三甲氧基甲硅烷基丙基）二亚乙基三胺（TMPA））的表面能在46.3和61.6mJ/m（2）之间。还使用机械冲击测试仪测量颗粒-基底粘附力。使用玻璃盘和珠，清洁并用TCOD和TMPA进行表面处理。设计了一种定制的水平冲击测试仪，并用于测量玻璃球和玻璃盘基板之间的粘附力。圆盘/颗粒圆盘的冲击导致颗粒去除，因为张力作用在颗粒上。在临界粒径下，拉伸剥离力和粘附力相等。采用约翰逊Kendall-Roberts（JKR）理论确定了颗粒与表面之间的界面能。等离子体清洗玻璃、TCOD处理玻璃和TMPA处理玻璃的平均界面能分别为44.8mJ/m2、21.6mJ/m2和40.1mJ/m2。这些值与文献值和使用上述VOGC方法确定的界面能非常一致，表明两种方法比较有利，尽管使用了显著不同的方法（分子与机械）。(C)2021爱思唯尔有限公司版权所有。
The mineral industry uses tremendous amounts of water every year in the processing of ores. Sustainable practices associated with the processing of ores are, therefore, of critical importance. The project described herein is the first step toward producing a dry, particle-separation process based upon control and exploitation of adhesive forces. In this research, the goal is to determine the surface energy of particles, and further, whether the solid surface energy can be used to understand the adhesion between these particles and surface-modified substrates. Glass spheres were chosen to represent silicate minerals, the most abundant type of minerals found in mineral deposits. The solid surface energy was found by using contact angle measurements and by applying the van Oss-Good-Chaudhury (VOGC) method. The VOGC method utilizes three-liquid triads to determine the Lifshitzvan der Waals, Lewis acid and Lewis base surface energy components. Surface energies from plasma-cleaned glass were between 40.2 and 60.2 mJ/m(2); for the same glass with a hydrophobic chemical surface treatment, trichloro(octadecyl)silane (TCOD), the surface energy was between 20.8 and 20.9 mJ/m(2); and for the glass with a hydrophilic chemical surface treatment (n(1)-(3-trimethoxysilylpropyl) diethylenetriamine (TMPA)) the surface energy was between 46.3 and 61.6 mJ/m(2). The particle-substrate adhesion was also measured using a mechanical impact tester. Glass disks and beads were used, cleaned and surface treated with TCOD and TMPA. A custom horizontal impact tester was designed and used to measure the adhesion force between the glass spheres and a glass disk substrate. Impact of the disk/particle puck causes particle removal as tensile forces act on the particles. The tensile detachment force and adhesive force are equal at a critical particle size. Johnson Kendall-Roberts (JKR) theory was used to determine the interfacial energy between the particles and the surface. The average interfacial energy of plasma cleaned glass, glass treated with TCOD and with TMPA were 44.8 mJ/m2, 21.6 mJ/m(2), and 40.1 mJ/m(2), respectively. These values are in good agreement with the literature values and with the interfacial energy determined using the VOGC method described above, demonstrating that two approaches compare favorably, despite the dramatically different methods (molecular vs mechanical) utilized. (C) 2021 Elsevier B.V. All rights reserved.