The role anions on the synthesis of AlOOH nanoparticles using simple solvothermal method

Abdollahifar, Mozaffar; Hidaryan, Masoud; Jafari, Pouria

doi:10.1016/j.bsecv.2017.06.002

Cited by 28 publications

(21 citation statements)

References 45 publications

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“…On the other hand, ATH20p has a much larger and broader peak for asymmetric and symmetric OH stretching vibrations centered at ∼3300, with a small shoulder at ∼2900 cm -1 . Absorption bands appeared at ∼1637 cm -1 (assigned to the stretching and bending modes of the adsorbed water molecules), as well as a string band at ∼1065 cm − 1 with a small shoulder at ∼1160 cm − 1 (assigned to the bending and wagging of the H bonds in the octahedral structure of OH-Al = O), at ∼746 cm − 1 (attributed to the stretching vibrations of Al-O-Al in the distorted AlO 6 ), at ∼664 cm − 1 and ∼559 cm − 1 , which are consistent with the reported values for a boehmite AlO(OH) structure (Abdollahifar et al 2018) and the crystalline structures of Al 2 O 3 de ned by the XRD analysis (Fig. 1a).…”

Section: Surface Morphological and Physico-chemical Properties Of Thesupporting

confidence: 90%

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Preprint

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Differently structured aluminum (tri/mono) hydroxide (Al(OH)3 / AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to Al2O3. However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20 % more energy between 300–400°C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31 − 0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which render it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (>60°) rendered such a film also useful in ecologically-benign and thermosensitive packaging.

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Section: Surface Morphological and Physico-chemical Properties Of Thesupporting

confidence: 90%

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Preprint

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“…The BET surface area and the total pore volume of γ-AlOOH micro/nanoflowers have been estimated to be 145.523 m 2 /g and 0.396 cm 3 /g (Figures 5A,C), respectively, while γ-AlOOH/Fe(OH) 3 micro/nanoflowers is 171.249 m 2 /g and 0.400 cm 3 /g (Figures 5B,D). The BET surface area of γ-AlOOH/Fe(OH) 3 micro/nanoflowers is not only higher than that of γ-AlOOH micro/nanoflowers but also higher than the reported values of other γ-AlOOH (Zhang et al, 2006;Feng et al, 2008;Hou et al, 2012;Meng et al, 2014;Abdollahifar et al, 2018). In Figures 5C,D, the pore size distribution curve of γ-AlOOH exhibits a broad peak in the range of 2-200 nm with a maximum at 90 nm while γ-AlOOH/Fe(OH) 3 is in the range of 2-200 nm with a maximum at 15 nm.…”

Section: Resultscontrasting

confidence: 53%

Monodispersed Hierarchical γ-AlOOH/Fe(OH)3 Micro/Nanoflowers for Efficient Oxygen Evolution Reaction

Huo

Zhang

et al. 2019

Front. Mater.

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Exploring efficient and inexpensive nanostructured catalysts for the oxygen evolution reaction (OER) is critical for economical electrochemical water splitting. Here, monodispersed γ-AlOOH/Fe(OH) 3 with hierarchical structures have been synthesized by a facile hydrothermal method and an electrostatic attraction treatment. The low overpotential of only 289 mV at a current density of 10 mA cm −2 for γ-AlOOH/Fe(OH) with a low Tafel slope of 80.2 mV dec −1 , which is greatly decreased than that of γ-AlOOH (347 mV and 88.4 mV dec −1). The monodispersed γ-AlOOH/Fe(OH) with hierarchical structures and abundance of surface hydroxyls have high specific surface areas and large pore volumes, which can provide more active sites to help the transfer of the electrons to improve the electrocatalytic performance for OER.

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“…Since different substances have been known to exert influences on the kinetics of hydrothermal sealing of anodized aluminum [22,159,312] and on synthesis/crystallization of phases relevant to the sealing process [287,300,313,314], positive outcomes are plausible by identifying environmentally benign and inexpensive chemical agents that have accelerative effects on the kinetics of alumina gel transformation to hydrated alumina (AlOOH) and compatible with the chemistry of the sealing bath processes. In this regard, Bautista et al [46][47][48] had reported that triethanolamine exerts catalytic effects on the sealing process thus altering the mechanism of alumina hydration, and concluded that for the organic molecules studied the concomitant presence of an alcohol group and an amine group in the same molecule tends to exert synergistic effects on the kinetics of the sealing process.…”

Section: Effect Foreign Anions and Cations On The Crystallization Of mentioning

confidence: 99%

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

2020

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Increasing demands for environmental accountability and energy efficiency in industrial practice necessitates significant modification(s) of existing technologies and development of new ones to meet the stringent sustainability demands of the future. Generally, development of required new technologies and appropriate modifications of existing ones need to be premised on in-depth appreciation of existing technologies, their limitations, and desired ideal products or processes. In the light of these, published literature mostly in the past 30 years on the sealing process; the second highest energy consuming step in aluminum anodization and a step with significant environmental impacts has been critical reviewed in this systematic review. Emphasis have been placed on the need to reduce both the energy input in the anodization process and environmental implications. The implications of the nano-porous structure of the anodic oxide on mass transport and chemical reactivity of relevant species during the sealing process is highlighted with a focus on exploiting these peculiarities, in improving the quality of sealed products. In addition, perspective is provided on plausible approaches and important factors to be considered in developing sealing procedures that can minimize the energy input and environmental impact of the sealing step, and ensure a more sustainable aluminum anodization process/industry.Coatings 2020, 10, 226 2 of 55 sealing methods. Furthermore, the applicability of another hitherto popular sealing process; chromate sealing, is currently limited to essential parts in the aerospace industry due to toxicological, health, and environmental implications traced to Cr(VI) employed in the process [7][8][9][10][11][12][13][14][15][16]. On the other hand, the advantages of another industrially utilized sealing process; the nickel fluoride (cold) sealing process is limited by the toxicity of nickel salts which narrows its range of application, and introduces added costs due to post-sealing wastewater treatments and management [17][18][19][20]. Further efforts at sealing anodized aluminum at temperatures lower than that used in hydrothermal (high temperature) sealing, have led to much variety in the chemical constitution and operating temperatures of sealing baths [21]. On the basis of temperature at which the sealing step is carried out, sealing can be classified into three major categories; high temperature, mid-temperature, and room-temperature or cold sealing. In this work sealing at temperatures from 0 to 40 • C is classified as low temperature sealing, from ≥ 40 • C to 70 • C as intermediate or mid temperature sealing, and sealing at temperatures > 70 • C as high temperature sealing.

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The role anions on the synthesis of AlOOH nanoparticles using simple solvothermal method

Cited by 28 publications

References 45 publications

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Monodispersed Hierarchical γ-AlOOH/Fe(OH)3 Micro/Nanoflowers for Efficient Oxygen Evolution Reaction

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

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