Pulsed-bed atomic layer deposition setup for powder coating

Tiznado, H.; Domínguez, D.; Muñoz‐Muñoz, Franklin; Romo-Herrera, J. M.; Machorro, R.; Contreras, O.; Soto, G.

doi:10.1016/j.powtec.2014.07.034

Cited by 26 publications

(18 citation statements)

References 45 publications

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“…Atomic layer deposition (ALD) has been used to fabricate powder nanocomposite with core shell structure. By this technique, it is possible to attain a uniform and complete control of the shell-thickness [4][5][6][7]. Recently, magnetic nanocomposites have attracted particular attention due to their potential application as microwave absorbing materials and electromagnetic devices [8].…”

Section: Introductionmentioning

confidence: 99%

The role of the interface on magnetic properties for YFeO3@Al2O3 core–shell structure

et al. 2019

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Core-shell YFeO 3 @Al 2 O 3 structure was obtained using advanced synthesis process. YFeO 3 @Al 2 O 3 assemble was achieved by coating individual YFeO 3 particles with several nanometers thickness of alumina-shell. After that, the particles characterization and the thickness control of the magnetic core/alumina interface were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Finally, the magnetic properties of the resulting system were investigated. We found that the alumina-shell thickness diminishes the magnetization values and enhance the exchange bias effect at low magnetic field. This fact is explained by the pinning the weak ferromagnetic and antiferromagnetic domains wall motion at the interface of the core/shell during the descending and ascending magnetization in the hysteresis curves. The results prove that the weak-ferromagnetic and the antiferromagnetic ordering not only coexist but also they are weakly coupled in YFeO 3 .

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Section: Introductionmentioning

confidence: 99%

The role of the interface on magnetic properties for YFeO3@Al2O3 core–shell structure

et al. 2019

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“…During the deposition, the powder container is rotating (rotation speed of 35 rotations per minute) to ensure a proper agitation of the powder which enables the deposition of a conformal coating on the powder. Contrary to the often used fluidized bed reactors, 37 the ALD reactor used in this study is a pump-type reactor, which means that no purge gas is used to evacuate the ALD chamber after a precursor/reactant pulse. Instead, a turbomolecular pump is used to pump the reaction products and excess of precursor/reactant molecules away.…”

Section: Methodsmentioning

confidence: 99%

Corrosion protection of Cu by atomic layer deposition

Cremers

Rampelberg

Baert

et al. 2019

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Atomic Layer Deposition (ALD) is a vapor phase technique which is able to deposit uniform, conformal thin films with an excellent thickness control at the atomic scale. 18 nm thick Al 2 O 3 and TiO 2 coatings were deposited conformaly and pinhole free onto micron-sized Cu powder, using trimethylaluminum (TMA) and tetrakis(dimethylamido)titanium(IV)(TDMAT) respectively as a precursor and de-ionized water as a reactant. The capability of the ALD coating to protect the Cu powder against corrosion was investigated. Therefore the stability of the coatings was studied in solutions with different pH in the range of 0-14, and in-situ raman spectroscopy was used to detect the emergence of corrosion products of Cu as an indication that the protective coating starts to fail. Both ALD coatings provide good protection at standard pH values in the range of 5-7. In general, the TiO 2 coating shows a better barrier protection against corrosion than the Al 2 O 3 coating. However for the most extreme pH conditions, pH 0 and pH 14, the TiO 2 coating starts also to degrade. 1

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“…Contrary to the often used fluidized bed reactors, [22] the ALD depositions took place in a home-built pump-type rotary ALD reactor for powders [23,24]. The reactor contains a rotating quartz tube in which a cylindrical stainless steel container is placed, containing the powder.…”

Section: Methodsmentioning

confidence: 99%