Electrophoretic deposition of aqueous alumina slips

Ferrari, B.; Moreno, Rodrigo

doi:10.1016/s0955-2219(96)00113-6

Cited by 112 publications

(62 citation statements)

References 12 publications

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“…However, lower conductivity values have been also reported [10,20] for 10 g/l YBCO suspensions prepared with similar amounts of I 2. Actually, charged particles should increase the number of conductive species in the suspension contributing to increase its conductivity [1,73]. However, reported results for concentrated suspensions [10,20] verified the decrease of conductivity with the addition of YBCO particles.…”

Section: Dispersing Mechanism Of Ybco Particles In Acetone-i 2 Solutionmentioning

confidence: 93%

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YBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media

Dusoulier

Cloots

Vertruyen

et al. 2011

Journal of the European Ceramic Society

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Electrophoretic Deposition (EPD) performance strongly depends on the particles surface chemistry and the ability to manipulate surface-liquid interfaces. In this study an extensive investigation of YBCO suspension in dry acetone, acetone-water mixtures and acetone-iodine is reported. Chemical instability of YBCO particles determines their colloidal behaviour. Charging mechanism of particles has therefore had to be deeply investigated for complete dispersion understanding. In order to determine the conditions of the YBCO suspension stability, measurements of pH, conductivity, zeta-potential, settling tests, modelling of the particle networks and electrophoretic deposition were done. The influence of the water and iodine concentration, and their role as stabilizers was evaluated. Based on experimental results, pair particle potentials were calculated and then different charging mechanisms of YBCO surfaces in acetone were proposed.

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Section: Dispersing Mechanism Of Ybco Particles In Acetone-i 2 Solutionmentioning

confidence: 93%

“…Deposit growths homogeneously compared to low reliability and uniformity of deposits without I 2 . Maximum deposition takes place for 0.04-0.05 g/l of I 2 , while a larger addition of I 2 (>0.15 g/l) reduces the deposit yield because of higher suspension conductivities [10,73].…”

Section: Dispersing Mechanism Of Ybco Particles In Acetone-i 2 Solutionmentioning

confidence: 99%

YBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media

Dusoulier

Cloots

Vertruyen

et al. 2011

Journal of the European Ceramic Society

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“…But, the use of aqueous system has more advantages as they need much lower voltage, lower cost, has less risk of fire, and is more environmental friendly than the hazardous organic liquids [30]. These advantages have prompted interest to develop water based graphene oxide coating by EPD.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, EPD involves organic liquids as the suspending medium because of their higher density, good chemical stability, and low conductivity [29]. But, the use of aqueous system has more advantages as they need much lower voltage, lower cost, has less risk of fire, and is more environmental friendly than the hazardous organic liquids [30]. These advantages have prompted interest to develop water based graphene oxide coating by EPD.…”

Section: Introductionmentioning

confidence: 99%

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

et al. 2017

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Abstract:In this paper, we report the use of a simple and inexpensive electrophoretic deposition (EPD) technique to develop thin, uniform, and transparent graphene oxide (GO) coating on copper (Cu) substrate on application of 10 V for 1 s from an aqueous suspension containing 0.03 wt % graphene oxide. GO was partially reduced during the EPD process itself. The GO coated on Cu was completely reduced chemically by using sodium borohydride (NaBH 4 ) solution. The coatings were characterized by field emission scanning electron microscope (FESEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and UV/VIS spectrophotometry. Corrosion resistance of the coatings was evaluated by electrochemical measurements under accelerated corrosion condition in 3.5 wt % NaCl solution. The GO coated on Cu and chemically reduced by NaBH 4 showed more positive corrosion potential (E corr ) (−145.4 mV) compared to GO coated on Cu (−182.2 mV) and bare Cu (−235.3 mV), and much lower corrosion current (I corr ) (7.01 µA/cm 2 ) when compared to 15.375 µA/cm 2 for bare Cu indicating that reduced GO film on copper exhibit enhanced corrosion resistance. The corrosion inhibition efficiency of chemically reduced GO coated Cu was 54.40%, and its corrosion rate was 0.08 mm/year as compared to 0.18 mm/year for bare copper.

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“…Si bien este problema existe y puede comprobarse a simple vista durante el ensayo de EPD, resulta sorprendente comprobar la escasa repercusi-n que tiene sobre la densidad en verde de las muestras obtenidas bajo unas condiciones elŽctricas controladas. En este sentido, se ha descrito en la bibliograf'a c-mo a partir de un ensayo de EPD de Al 2 O 3 sobre grafito [24], aplicando densidades de corriente desde 1,6 a 12,8 mA cm -2 , se obtienen dep-sitos con densidades en verde dentro de un rango de 53-55%. La figura 10 muestra la microestructura del dep-sito de Al 2 O 3 obtenido en el ensayo realizado aplicando 12,8 mA cm -2 durante 10 minutos, en la que se puede comprobar la elevada homogeneidad de un dep-sito obtenido a partir de una suspensi-n acuosa de dicho polvo.…”

Section: Ventajas E Inconvenientesunclassified

Conformado de materiales cerámicos por electroforesis en medios acuosos

Ferrari¹,

Moreno²

1998

Bol. Soc. Esp. Ceram. Vidr.

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La deposici-n electroforŽtica es un proceso de conformado particularmente sencillo en el que, al hacer pasar una corriente a travŽs de una suspensi-n coloidal o una disoluci-n, se obtienen recubrimientos sobre materiales conductores. La mayor parte de los materiales org ‡nicos y minerales pueden ser procesados por electrodeposici-n, siendo la mayor dificultad la selecci-n del veh'culo l'quido y el ajuste de las condiciones experimentales al sistema seleccionado. En el conformado por v'a l'quida el Žxito del proceso radica en la preparaci-n de suspensiones estables de determinadas caracter'sticas elŽctricas. En este sentido el uso de veh'culos org ‡nicos presenta grandes ventajas, ya que evitan en gran medida los procesos electrol'ticos que tienen lugar en el entorno del electrodo, y que por tanto afectan a la homogeneidad y posible contaminaci-n del recubrimiento. No obstante, el uso de org ‡nicos supone el encarecimiento de un proceso que se caracteriza por sus ventajas econ-micas y ecol--gicas. Por ello, los procesos de electroforesis a partir de medios acuosos, est ‡n recibiendo una creciente atenci-n dadas las enormes posibilidades para su implantaci-n en ciclos de producci-n de una amplia gama de materiales, como de hecho ocurre en la obtenci-n de recubrimientos de arcillas y esmaltes. En este trabajo se lleva a cabo una revisi-n de la fisicoqu'mica del proceso as' como de sus posibilidades de aplicaci-n en la fabricaci-n de productos cer ‡micos y v'treos en medio acuoso. Palabras clave: Deposici-n, Electroforesis, Suspensiones, Recubrimientos. Electrophoretic forming of ceramics in aqueous mediaElectrophoretic deposition is a particularly easy forming technique in which coatings onto conducting electrodes are obtained after applying a dc electric field to a colloidal suspension or solution. Most organic materials and minerals can be deposited, being the biggest difficulty the selection of the organic vehicle and the adjustment of the experimental conditions. In wet forming processes, the success is determined by the preparation of stable suspensions with the required electrical properties. In this sense, the use of organics presents important advantages, since avoid electrolityc processes in the vicinity of electrodes, which highly affect the homogeneity and contamination of the coating. However, the use of organics increases the costs of a process characterized for its economical and environmental advantages. This is the reason why aqueous electrophoresis is receiving an increasing attention due to the great possibilities to be considered for production cycles for a broad variety of materials, as already occurs in the case of clays and enamels. In this work, a review of the physical chemistry of the process is made, and possible applications in ceramics and glasses manufacturing are evaluated. Key words: Deposition, Electrophoresis, Suspensions, Coatings INTRODUCCIîNEl conformado por deposici-n electroforŽtica, o electrodeposici-n (EPD), se enmarca dentro de los mŽtodos de conformado por v'a hoemeda, en l...

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Electrophoretic deposition of aqueous alumina slips

Cited by 112 publications

References 12 publications

YBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media

YBa2Cu3O7−x dispersion in iodine acetone for electrophoretic deposition: Surface charging mechanism in a halogenated organic media

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

Conformado de materiales cerámicos por electroforesis en medios acuosos

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