Particle-Substrate-Charge Interactions Observed using Evansescent Waves
A system using interaction of evanescent light waves with particles in a liquid (such as display fluid) allows one to observe accumulation and stability of such particles at and in the vicinity of a surface. Accumulation can be due to electrophoresis, sedimentation, or equilibration of the substrate surface with the bulk solution. Observation is sensitive only to particles within less than 1 micron of the interface, so observation can be made with an arbitrary thickness of fluid. Evanescent wave absorption is monitored adjacent to an ITO-coated glass slide affixed to a high index prism. The test fluid either can be constrained by a secondary metal electrode or left as a free fluid film. In the latter case free charge can be injected into the system from an external charge generator allowing one to separate field and charge induced effects. This system is ideal for investigating device life limiting interactions between colorants and substrates in displays. We show that adhesion to electrodes can dominate motion of pigments in display applications, and in many instances pigment remains attached to the ITO electrode even after application of a large reverse polarity electric field. We also demonstrate the significance of colorant stabilizing surfactants on colorant accumulation and adhesion on the substrate surface.
Henryk Birecki Thomas C. Anthony
Hewlett Packard, Palo Alto, California, USA
国际会议
The 31st International Congress on Imaging Science(第31届国际影像科学大会 ICIS2010)
北京
英文
325-328
2010-05-12（万方平台首次上网日期，不代表论文的发表时间）