Anodization of aluminum in a sealed container

Zhang, Jin; Yu, Yuantian; Fang, Pengjin; Liu, Lin; Yue, Hangyu; Ou, Jiali; Han, Aijun

doi:10.1016/j.elecom.2021.107086

Cited by 46 publications

(18 citation statements)

References 53 publications

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“…1b, d and f and the relationship between the length of nanotubes and the growth rate of nanotubes has always been a challenge for metal anodization. 20,[28][29][30][31] 3.2 Interpretation of three stages of the current-time curve with the double current model Fig. 2 shows the schematic diagram of nanotube formation depending on the oxygen bubble model during anodization of titanium.…”

Section: Current-time Curve Of Anodization Of Titanium In Pure Nh 4 F...mentioning

confidence: 99%

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A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

et al. 2022

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Section: Current-time Curve Of Anodization Of Titanium In Pure Nh 4 F...mentioning

confidence: 99%

“…The inuence of atmospheric pressure on anodization of metals has been demonstrated by researchers. 31,42 Fig. 6c and d show the surface morphology of the anodic oxide lm obtained in an electrolyte consisting of 0.5 wt% NH 4 F and 8 wt% H 3 PO 4 .…”

Section: Papermentioning

confidence: 99%

A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

et al. 2022

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“…Studies have shown that Al substitution at the Bi site will increase the band gap and maintain high photocatalytic hydrolysis and redox properties, while Al substitution at the V site is difficult to achieve in terms of energy due to charge imbalance. 45,47 Doping (Li 0.4 RE 0.6 Al 0.6 ) x/2 MoO 4 into BiVO 4 will change the O 2p band, and at the same time, modify the Bi 6s -O 2p hybrid orbital to further increase the band gap. Figure S3 shows a schematic diagram of the orbitals of different rare earth substitutions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Prokofiev et al studied the optical band gap changes of rare earth sesquioxides, and the results showed that the 4f band occupied by rare earth sesquioxides is above the O 2p energy level, so the 4f–d transition can determine the absorption edge. Studies have shown that Al substitution at the Bi site will increase the band gap and maintain high photocatalytic hydrolysis and redox properties, while Al substitution at the V site is difficult to achieve in terms of energy due to charge imbalance. , Doping (Li 0.4 RE 0.6 Al 0.6 ) x /2 MoO 4 into BiVO 4 will change the O 2p band, and at the same time, modify the Bi 6s -O 2p hybrid orbital to further increase the band gap. Figure S3 shows a schematic diagram of the orbitals of different rare earth substitutions.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Yellow Pigments (Li_0.4RE_0.6Al_0.6)_1/2MoO₄–BiVO₄ with High NIR Reflectance

Feng

Xiao

et al. 2021

ACS Sustainable Chem. Eng.

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In this work, a new type of near-infrared (NIR) reflective yellow pigment with a general formula of [(Li 0.4 RE 0.6 Al 0.6 ) x/2 Bi 1−x ][Mo x V 1−x ]O 4 was prepared by a solid-phase reaction calcined at a high temperature of 700 °C. Xray diffraction (XRD), scanning electron microscope (SEM), a UV−vis−NIR spectrophotometer, and other methods were used to characterize the structure, morphology, and optical properties of synthetic pigments. For a series ofO 4 pigments, when x > 0.2, bismuth vanadate changes from the monoclinic phase (space group I2/b(15)) to the tetragonal scheelite phase (space group I4 1 /a(88)). The structures of the pigments are all tetragonal scheelite phases, and the difference in their color rendering is mainly due to the differences between the valence band and the conduction band and the difference in the band gap caused by different rare earth elements. The NIR reflectance (R %) and NIR solar reflectance (R* %) of [(Li 0.4 La 0.6 Al 0.6 ) 0.1 Bi 0.8 ][Mo 0.2 V 0.8 ]O 4 pigments are 96.64 and 93.10% (b* = 77.13, C* = 77.6), respectively. In the acid and alkali resistance test, the color difference values ΔE* of the pigment before and after soaking are less than 5. Finally, the thermal infrared test of the synthetic pigments and commercial pigments on galvanized plates without or with TiO 2 was performed. The experimental results show that the temperature difference between the synthetic pigment and commercial bismuth yellow can reach 11 °C. Therefore, it is believed that the synthetic pigment can reflect more heat radiation from sunlight and has better heat insulation performance. The synthetic pigment has higher reflectivity than the commercially available bismuth vanadate pigment, showing its application potential.

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“…It is worth noting that the NIR solar reflectivity of the pigment diminishes when the Fe-dopant concentration is equal to 0.25. The oxygen vacancies act as electron traps to trap free carriers when they increase to a certain concentration, thus forming the Schottky barrier and reducing the carrier concentration. − Therefore, for the Fe-doped BaSnO 3 pigment, the trend of the NIR solar reflectance is to first increase and then decrease.…”

Section: Results and Discussionmentioning

confidence: 99%

Thermal Insulation Performance of Novel Coated Fabrics Based on Fe-Doped BaSnO₃ Near-Infrared Reflectance Pigments

Wang

Han

et al. 2021

ACS Sustainable Chem. Eng.

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In this paper, a series of coated fabrics based on Fe-doped BaSnO3 (BaSn1–x Fe x O3−δ, x = 0.00, 0.05, 0.10, 0.20, 0.25) powder pigments were prepared. The results indicate that the developed pigments are substitutional solid solutions with no impurity and the valencies of iron confirmed by X-ray photoelectron spectroscopy (XPS) are +2 and +3. The BaSn1–x Fe x O3−δ pigments possess high near-infrared (NIR) solar reflectance (64.92–79.81%), and the change in the near-infrared reflectance value can be explained by the free carrier concentration and electron trap theory. The pigments exhibit the alteration of yellow-green to brown, which is ascribed to the charge-transfer transition (Sn 5s + 5p ↔ Fe 3d). The BaSn1–x Fe x O3−δ-coated fabrics exhibit excellent high NIR solar reflectance and thermal insulating performance. The NIR solar reflectance of the BaSn0.80Fe0.20O3−δ-coated fabric is up to 64.30%. Compared with those of brown uncoated fabric and conventional brown (Pigment Yellow 42) coated fabric, the inner surface temperature of the BaSn0.80Fe0.20O3−δ-coated fabric is lowered by 7.6 and 4.2 °C, while the heat absorption is reduced by 51.0 and 37.9%, respectively. The coated fabric shows excellent washing durability and chemical stability. In summary, these coated fabrics have the potential to serve as thermal insulation coated fabrics.

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Anodization of aluminum in a sealed container

Cited by 46 publications

References 53 publications

A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

Synthesis and Characterization of Yellow Pigments (Li_0.4RE_0.6Al_0.6)_1/2MoO₄–BiVO₄ with High NIR Reflectance

Thermal Insulation Performance of Novel Coated Fabrics Based on Fe-Doped BaSnO₃ Near-Infrared Reflectance Pigments

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Anodization of aluminum in a sealed container

Cited by 46 publications

References 53 publications

A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

A phosphoric anion layer inhibits electronic current generation and nanotube growth during anodization of titanium

Synthesis and Characterization of Yellow Pigments (Li0.4RE0.6Al0.6)1/2MoO4–BiVO4 with High NIR Reflectance

Thermal Insulation Performance of Novel Coated Fabrics Based on Fe-Doped BaSnO3 Near-Infrared Reflectance Pigments

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Product

Resources

About

Synthesis and Characterization of Yellow Pigments (Li_0.4RE_0.6Al_0.6)_1/2MoO₄–BiVO₄ with High NIR Reflectance

Thermal Insulation Performance of Novel Coated Fabrics Based on Fe-Doped BaSnO₃ Near-Infrared Reflectance Pigments