Xerox Corporation, Xerox Research Center, Webster 800 Phillips Road, 147-59B Webster, New York 14580, United States.
ACS Appl Mater Interfaces. 2012 Aug;4(8):4288-95. doi: 10.1021/am300975r. Epub 2012 Aug 10.
Offset of imaging material from a fuser surface to paper during fusing is highly undesirable in printing. Here the wetting and repellent characteristics of three imaging materials (a solid wax ink, a waxy polyester toner, and a polyester toner) in their molten states have been studied on three model print surfaces: a transparency (surrogate for paper), a PTFE film, and a model superoleophobic surface, with the aim of assessing their performance in fusing. The superoleophobic surface, with water and hexadecane contact angles of ∼156° and sliding angles at ∼10°, comprises 3 μm diameter pillar arrays on silicon wafer and was fabricated by photolithography followed by surface modification with a fluorosilane. The contact angles of the three imaging materials range from 40 to 79° on the transparency and the sessile drops do not slide even at 90° tilted angle, indicating that they all wet, adhere, and pin on the transparency. Although the contact angles of the three imaging materials are slightly higher (63-85°) on PTFE, the sessile drops do not slide on PTFE either. Because PTFE is widely used as a fuser surface material in combination with different waxy imaging materials commercially, we attribute the successful implementation of PTFE to the use of the wax additive. With the superoleophobic surface, there is a dramatic increase in advancing and static contact angles for all three imaging materials. The advancing and static contact angles are in the 150-168° range for waxy toner, indicative of superhigh repellency. Although the advancing and static contact angles for the polyester toner decrease slightly at 147 and 130°, respectively, the repellency is still very high. More importantly, the sessile drops of all three imaging materials are mobile upon tilting and they all have high receding contact angles. The overall results suggest that the adhesion between the superoleophobic surface and the ink and toner materials are very small relative to those with paper and PTFE. The important of high repellency and low adhesion to offset performance is discussed.
在打印过程中，熔融的成像材料从热熔器表面偏移到纸张上是非常不理想的。在这里，研究了三种成像材料（固体蜡墨、蜡质聚酯调色剂和聚酯调色剂）在熔融状态下在三种模型打印表面上的润湿性和疏油性特征：透明胶片（替代纸张）、PTFE 薄膜和模型超疏油表面，目的是评估它们在热熔过程中的性能。超疏油表面的水和十六烷接触角约为 156°，滑动角约为 10°，由硅片上的 3 μm 直径的立柱阵列组成，并通过光刻和随后用氟硅烷进行表面改性来制造。三种成像材料在透明胶片上的接触角范围从 40 到 79°，即使在 90°倾斜角度下，固着液滴也不会滑动，表明它们都润湿、粘附并固定在透明胶片上。尽管三种成像材料在 PTFE 上的接触角略高（63-85°），但固着液滴在 PTFE 上也不会滑动。由于 PTFE 广泛用作与商业上不同的蜡质成像材料结合的热熔器表面材料，我们将 PTFE 的成功应用归因于蜡添加剂的使用。对于超疏油表面，所有三种成像材料的前进和静态接触角都有显著增加。蜡质调色剂的前进和静态接触角在 150-168°范围内，表明具有超高的疏油性。尽管聚酯调色剂的前进和静态接触角分别略有下降到 147 和 130°，但其疏油性仍然非常高。更重要的是，所有三种成像材料的固着液滴在倾斜时都是可移动的，并且它们都具有高后退接触角。总体结果表明，与纸张和 PTFE 相比，超疏油表面与油墨和调色剂材料之间的粘附力非常小。讨论了高疏油性和低粘附性对偏移性能的重要性。
