Abarca Carla, Yang Songtao, Pelton Robert H
Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L8, Canada.
Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L8, Canada.
J Colloid Interface Sci. 2015 Dec 15;460:97-104. doi: 10.1016/j.jcis.2015.08.052. Epub 2015 Aug 24.
To function as flotation collectors for mineral processing, polymeric nanoparticles require a delicate balance of surface properties to give mineral-specific deposition and colloidal stability in high ionic strength alkaline media, while remaining sufficiently hydrophobic to promote flotation. Combinatorial nanoparticle surface modification, in conjunction with high throughput screening, is a promising approach for nanoparticle development. However, efficient automated screening assays are required to reject ineffective particles without having to undergo time consuming flotation testing. Herein we demonstrate that determining critical coagulation concentrations of sodium carbonate in combination with measuring the advancing water contact angle of nanoparticle-saturated glass surfaces can be used to screen ineffective nanoparticles. Finally, none of our first nanoparticle library based on poly(ethylene glycol) methyl ether methacrylate (PEG-methacrylate) were effective flotation collectors because the nanoparticles were too hydrophilic.
为了作为矿物加工的浮选捕收剂发挥作用，聚合物纳米颗粒需要在表面性质上达到微妙的平衡，以便在高离子强度碱性介质中实现特定矿物的沉积和胶体稳定性，同时保持足够的疏水性以促进浮选。组合纳米颗粒表面改性与高通量筛选相结合，是纳米颗粒开发的一种有前途的方法。然而，需要高效的自动筛选测定法来排除无效颗粒，而无需进行耗时的浮选测试。在此，我们证明，结合测量纳米颗粒饱和玻璃表面的前进水接触角来确定碳酸钠的临界凝聚浓度，可用于筛选无效的纳米颗粒。最后，我们基于聚（乙二醇）甲基丙烯酸甲酯（PEG-甲基丙烯酸甲酯）的首个纳米颗粒文库中没有一个是有效的浮选捕收剂，因为这些纳米颗粒过于亲水。
