Influence of electrostatic particle interactions on the properties of particulate coatings of titanium dioxide.
Influence of electrostatic particle interactions on the properties of particulate coatings of titanium dioxide.
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静电颗粒相互作用对二氧化钛颗粒涂层性能的影响
DOI：
10.1016/j.jcis.2014.01.005
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发表时间：
2014
影响因子：
9.9
通讯作者：
Schilde
中科院分区：
文献类型：
--
作者：
Schilde
微粒涂料被广泛应用于各种技术领域。影响这些涂层性能的应用很大程度上取决于生产过程中结构的形成。因此，所用配方的初级和次级粒径、粒径分布、颗粒形态以及颗粒-颗粒和颗粒-流体相互作用影响所得涂层性能。在本研究中，二氧化钛颗粒用搅拌介质分散在乙醇中，并进行静电稳定。随后，对悬浮液进行不稳定处理，使其达到特定的pH值，并通过浸涂处理成涂料。考察了悬浮液的pH *值对悬浮液粘度、结块大小、zeta电位等性能以及镀层厚度、微力学性能、耐磨性、光泽度、粗糙度和附着力等应用性能的影响。发现静电粒子间的相互作用对纳米颗粒涂层的结构形成和性能有显著影响。涂层结构在微观、中观和宏观尺度上影响涂层性能。利用Rumpf理论模型，将涂层的选择性性能与涂层结构联系起来。除了其他重要的工艺和配方参数外，为了生产具有所需性能的均匀功能性涂层，需要精确调整颗粒相互作用。
HypothesisParticulate coatings are used in a wide range of technical applications. The application affecting properties of these coatings depend strongly on the structure formation along the production process. Thus, primary and secondary particle size, size distribution, particle morphology as well as the particle–particle and particle–fluid interactions of the used formulation affect the resulting coating properties.ExperimentsIn this investigation titanium dioxide particles were dispersed in ethanol with a stirred media mill and stabilised electrostatically. Subsequently, the suspension was destabilised to reach specific pH*values and processed into coatings by dip coating. The influence of the pH∗value of the suspension on the suspension’s properties such as viscosity, agglomerate size and zeta potential and on its application properties such as coating thickness, micro-mechanical properties, abrasion resistance, gloss, roughness and adhesion was examined.FindingsThe electrostatic particle interactions show a significant influence on the structure formation as well as on the properties of nanoparticulate coatings. The coating properties are affected by the coating structures on micro-, meso- or macroscopic scale. Selective coating properties were related to the coating structure using the theoretical model of Rumpf. Besides other important process and formulation parameters, for the production of homogeneous, functional coatings with the desired properties a precise adjustment of the particle interactions is necessary.
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