Multi‐Walled Carbon Nanotube Coatings Using Electrophoretic Deposition (EPD)

Abstract

A method based on electrophoretic deposition (EPD) has been developed to produce uniform deposits of multi‐walled carbon nanotubes on stainless‐steel substrates. Aqueous suspensions were used under constant voltage conditions in the range of 5–50 V, with deposition times ranging from 0.5 to 10 min. The thickness of the coatings was controlled by variation of voltage and deposition time during EPD. Coatings of up to 10 μm thickness were achieved, with a homogeneous microstructure. The EPD technique is fast, effective, and can be applied to complex shapes. Possible applications are in heat extraction devices or porous coatings for tissue engineering scaffolds.

Switchable Surfactant-Assisted Carbon Nanotube Coatings: Innovation through pH Shift

“…However, it must be noted that, using this method, aggressive oxidation treatments that may damage the CNT or metal nanoparticles are not necessary to achieve the CNT suspensions. Nevertheless, the concentrations reported in this work are within the same range as other publications, which have studied the preparation of CNT inks (Thomas et al, 2005;Bravo-Sanchez et al, 2010). Figure 3 shows the UV-Vis-NIR spectra of two different stable CNT dispersions analyzed in the present study, where the peak appearing at 220 nm corresponds to the absorption band of the surfactant DPDMA.…”

“…Oxidized CNTs may be dispersed in water under neutral to alkaline www.frontiersin.org pH due to the presence of acidic O-containing groups such as carboxylic acids, lactones, or phenols. At alkaline pH values, these groups release their acidic protons to give negatively charged CNTs where water molecules may easily disrupt the π-π stacking interactions, leading to the CNTs dispersion in the solvent (Thomas et al, 2005). Acidifying the solution leads to CNT coagulation due to the neutralization of these charges, as we have recently reported (Sanchís et al, 2014).…”

Electrophoretically Deposited Multiwall Carbon Nanotubes (MWCNTS) and Hydroxyapatite (HA) on Stainless Steel (SS): Effective Biomaterial for Orthopedic Implant Applications

“…Furthermore, water possess higher dielectric constant which leading to higher electrophoretic mobility and zeta potential [21]. Figure 1(a) shows the electrophoretically deposited of functionalized MWCNTs of MWCNT-OH on type 316L SS, followed by deposition of HA on coating layer of MWCNT-OH as shown in Figure 1 surface oxides on the MWCNT-OH could electrostatically stabilize the aqueous suspension for certain period of times as reported by Thomas et al [22]. The functionalization process could reduce the MWCNT length which minimizing the aggregates present in suspension.…”

Aqueous electrophoretic deposition of YSZ electrolyte layers for solid oxide fuel cells

“…In spite of both the economic and environmental disadvantages, however, most of these researches employed organic solvents, instead of water, as the carrier of their suspensions to avoid the detrimental effects of electrolysis of water on the quality of deposited film. Although there are a few studies [11][12][13][14][15][16][17][18][19][20][21][22] focused on the development of aqueous EPD technique with suppressed/controlled electrolysis problem, seldom has been found in the field of SOFC. In this paper, preparation of yttria-stabilized zirconia (YSZ) electrolyte film on a porous anode Ni/YSZ cermet was investigated using aqueous EPD.…”