Aqueous Electrophoretic Deposition at High Electric Fields

Abstract

From an environmental, safety and economic perspective water should be the solvent of choice for electrophoretic deposition under industrial circumstances. However, because of the electrolytic decomposition of water under the influence of direct current, the majority of EPD is carried out in non-aqueous solvents. In this work, experiments prove that deposits can be obtained from aqueous alumina suspensions while avoiding electrolysis of the medium by using unbalanced alternating current fields [1]. In addition it is shown that the formed deposits have a green density which is intrinsically higher than those formed by traditional DC EPD from ethanol based suspensions. A theoretical basis for both electrophoretic deposition by means of unbalanced alternating fields and the higher density of deposits formed by application of such fields is provided.

MWCNTs-PANi nanocomposite films prepared by AC-EPD technique and its potential for enhance supercapacitor electrode

“…The main issue with DC-EPD is hydrolysis of water occur with potential difference higher than 10 V [21][22][23][24]. The formation of the air bubbles increased as the deposition time and the voltage applied increased.…”

Electrophoretic Deposition of Zirconia Thin Film on Nonconducting Substrate for Solid Oxide Fuel Cell Application

“…This bubble formation can affect the deposition quality. However, recently good quality deposition is also obtained in aqueous medium under AC and pulsed DC electric field . Such a deposition technique is gaining growing interest to fabricate dense electrolyte or porous electrode for SOFC because of several advantages such as easy control of thickness, short deposition time, low equipment cost, ability to form both dense and porous thin/thick film, uniform deposition on any complex shape, and easy to scale‐up for mass production.…”

The aqueous electrophoretic deposition (EPD) of diamond–diamond laminates

“…Neirinck et al [37] suggest that the electrochemical decomposition of water is a sluggish process and that frequencies of 50 Hz are sufficient to stop the reaction from happening. The deposits made using this were free of pores caused by bubble formation (Figure 2.9).…”

“…Page | 18 Another solution to the gas formation problem was discovered by Neirinck et al [37] An unbalanced alternating current was used instead of the traditional DC current that is used in most setups. Neirinck et al [37] suggest that the electrochemical decomposition of water is a sluggish process and that frequencies of 50 Hz are sufficient to stop the reaction from happening.…”