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Surface Treatments of Load Bearing Bio-implant Materials
Published in Savaş Kaya, Sasikumar Yesudass, Srinivasan Arthanari, Sivakumar Bose, Goncagül Serdaroğlu, Materials Development and Processing for Biomedical Applications, 2022
K. Saranya, P. Agilan, M. Kalaiyarasan, N. Rajendran
The electrophoretic deposition (EPD) process is associated with the migration and accumulation of charged particles by an applied electric field onto a conductive electrode to fabricate films and coatings on materials. EPD facilitates the fabrication of a variety of structures with different compositions, complex shapes, advanced materials with nano- and micro-sized, thin and thick films, and also form porous scaffolds with highly compact coatings. The EPD process can be widely used for the deposition of colloidal particles of metals, ceramics, polymers and composite materials. Mostly, it has been used for depositing bioactive ceramics on metallic implant materials. Bioactive nanostructures of titania, alumina, zirconia and hydroxyapatite coatings on metal substrates were produced by EPD (Abbass et al. 2021).
Oxide Based Supercapacitors I-Manganese Oxides
Published in Ling Bing Kong, Nanomaterials for Supercapacitors, 2017
Ling Bing Kong, Wenxiu Que, Lang Liu, Freddy Yin Chiang Boey, Zhichuan J. Xu, Kun Zhou, Sean Li, Tianshu Zhang, Chuanhu Wang
Electrophoretic deposition (EPD) is another electro-deposition technique that has been widely used to deposit various coatings. EPD is realized due to the migration of charged particles of an electrode and deposition on it at an external electric field in a specific suspension towards. Bath compositions of EPD are comprised of different additives, in order to achieve stabilization and charge the inorganic particles in the suspensions. The deposition of MnO2 films by using EPD usually consists of two steps, (i) preparation of a stable suspension of charged MnO2 particles through the reduction of KMnO4 in aqueous solutions with certain reducing agents and (ii) deposition at certain potentiostatic or galvanostatic conditions [9394133–135]. Deposition parameters that can be used control over microstructures and properties of MnO2 films include voltage, current density, solution concentration, pH value, deposition temperature and type of additives.
Silver-Polysaccharide Nanocomposite Antimicrobial Coatings
Published in Vikas Mittal, Polymer Nanocomposite Coatings, 2016
Andrea Travan, Eleonora Marsich, Ivan Donati, Massimiliano Borgogna, Sergio Paoletti
Electrophoretic deposition (EPD) is a process in which charged colloidal particles suspended in a liquid medium migrate under the influence of an electric field and are deposited onto an electrode (Figure 1.4); this coating technique enables good control over the thickness, morphology, crystallinity, and stoichiometry of the deposits.
Component fabrication techniques for solid oxide fuel cell (SOFC) – A comprehensive review and future prospects
Published in International Journal of Green Energy, 2022
Alagu Segar Deepi, Srinivasan Dharani Priya, Arputharaj Samson Nesaraj, Anburaj Immanuel Selvakumar
Electrophoretic deposition (EPD) is known for its good uniformity, fast deposition rate, and its simplicity (Pikalova and Kalinina 2019). It is a process that utilizes electrophoretic force to suspend the particles in a colloidal solution and to collect it on to a substrate. When the potential is applied, the suspended coating particles are polarized and pulled toward the substrate (e.g., carbon or graphite) to form a loose coating. The coating is sintered at high temperature to secure the bonds between the particles and the substrate (Cherng et al. 2012). The technique has been used for the preparation of Ni-based cermet layers or films of SOFC applications. Majhi et al. has reported the use of an inexpensive electrophoretic deposition (EPD) technique in making about 10 micron thin and dense YSZ electrolytes on the NiO-YSZ substrate. They optimized the effect of different operating parameters such as applied voltage and deposition time during deposition from YSZ suspension in acetylacetone. They have co-sintered YSZ/ NiO-YSZ bi-layers at 1450°C for 5 hr. The reported single SOFC cell tested using H2 as fuel and ambient air as oxidant exhibits an open circuit voltage (OCV) of 1.03 V and a peak power density of around 624 mW/cm2 (Majhi et al. 2011).
Electronic and optoelectronic applications of solution-processed two-dimensional materials
Published in Science and Technology of Advanced Materials, 2019
Electrophoretic deposition (EPD) is a colloidal movement process of charged materials in suspension under an extra electric field. This feature indicates that the deposition process will occur if the suspended materials are electrically charged. Fortunately, solution-processed 2D materials are usually positively or negatively charged, which makes EPD work. During the EPD process, 2D materials or other colloids need to be well dispersed in the suspension to ensure the stability of the colloidal system. Different from the methods mentioned above, which are usually used to fabricate thin films, EPD can easily achieve large-scale assembly of thick films on substrates. The equipment to perform EPD is low-cost and simple. In addition, the deposition rate is controllable, and the deposition kinetics is predictable. 2D materials with lateral sizes less than 50 µm can be easily driven by electrical field and deposited by EPD. GO is one of the first 2D materials which has been assembled by EPD [40]. Various deposition morphologies such as free-standing films, wrinkle films, and multi-layer 2D composites can be obtained by modulating current change during EPD process. There are many studies utilize EPD method for the fabrication of heterostructures or patterned structures of 2D materials. For example, Lin et al. have fabricated a MoS2-graphene composite film by EPD, which has high transmittance (>70%) under visible light [41]. It is noted that chemical reactions such as reduction or aqueous electrolysis may happen during EPD process, which would bring some side-effects toward the assembled structure.
Combination of electrophoretic and electroless depositions to fabricate Ni/TiC cladding
Published in Surface Engineering, 2020
M. R. Gorji, S. Sanjabi, C. Edtmaier
Electrophoretic deposition (EPD) is a colloidal technique to deposit the electrically charged particles of ceramics, polymers and composites onto the substrate. The electrophoretically deposited layers are inherently porous and required to be consolidated by a post-sintering operation to become applicable as a wear-resistant coating [14–16]. Liquid phase sintering (LPS) is a process generally utilized for consolidation of powder compacts. The main benefits of LPS for densification of porous structures can be regarded as follows: (1) modulating volume fraction of the reinforcement and (2) the minimum changes of reinforcement morphology and size (abnormal growth and agglomeration) [17].