Sol–Gel Aluminum Hydroxides and Their Thermal Transformation Studies for the Production of α-Alumina

Castruita, Griselda; Perera-Mercado, Yibran; Saucedo‐Salazar, Esmeralda

doi:10.1007/s10904-013-9905-y

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…At a temperature below 200 °C, Al(OH) 3 maintain its original chemical structure, while it starts to lose H 2 O molecules as the temperature surpassed 200 °C, converting the hydroxide into AlOOH intermediates. [ 31 ] As the temperature ramped up, the dehydration of aluminum composites is continued and AlOOH intermediates became Al 2 O 3 when the sample was heated at 500 °C. The XRD data allowed to verify the structural transformation of the aluminum composite as previously reported.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD data allowed to verify the structural transformation of the aluminum composite as previously reported. [ 31 ]…”

Section: Resultsmentioning

confidence: 99%

“…The XRD data allowed to verify the structural transformation of the aluminum composite as previously reported. [31] Since the calcination process of Al(OH) 3 endowed g-CDs with RTP, we further studied the photophysical properties of g-CDs@Al 2 O 3 (Figure 3b-e). Figure 3b shows the FL and Phos emission spectra under UV light excitation at 360 nm, evidencing the two maximum emission peaks at 438 and 510 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…By increasing the temperature during the calcination process, aluminum hydroxide underwent a dehydration process and its structure changed from Al(OH) 3 to AlOOH and Al 2 O 3 . [ 31 ] As a consequence, the matrix of the aluminum compound became more compact and enhanced the stability of the triplet state of g‐CDs leading to emission of Phos. It is worth noting that this calcinated Phos CDs can emit yellow Phos under white light irradiation, while releasing green Phos under 365 nm UV lamp illumination.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Lü

Wen

et al. 2023

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The preparation of room temperature phosphorescent carbon dots still faces great challenges, especially in the case of carbon dots endowed of visible‐light excitable room temperature phosphorescence (RTP). To date, a limited number of substrates have been exploited to synthesize room temperature phosphorescent carbon dots, and most of them can emit RTP only in solid state. Here, the synthesis of a composite obtained from the calcination of green carbon dots (g‐CDs) blended with aluminum hydroxide (Al(OH)3) is reported. The resultant hybrid material g‐CDs@Al2O3 exhibits blue fluorescence and green RTP emissions in an on/off switch process at 365 nm. Notably, this composite manifests strong resistance to extreme acid and basic conditions up to 30 days of treatment. The dense structure of Al2O3 formed by calcination contributes to the phosphorescent emission of g‐CDs. Surprisingly, g‐CDs@Al2O3 can also emit yellow RTP under irradiation with white light. The multicolor emissions can be employed for anti‐counterfeiting and information encryption. This work provides a straightforward approach to produce room temperature phosphorescent carbon dots for a wide range of applications.

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Section: Resultsmentioning

confidence: 99%

“…The XRD data allowed to verify the structural transformation of the aluminum composite as previously reported. [ 31 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Lü

Wen

et al. 2023

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“…A conventional method used to prepare it is by means of solid-phase transformation through thermal decomposition of aluminum hydroxides. Alumina precursors can be synthesized by sol-gel process where an aluminum salt, such as AlCl 3 , AlNO 3 , Al 2 (SO 4 ) 3 , is hydrolyzed to form the corresponding aluminum hydroxide which precipitates [31]. The thermal treatment at different temperatures leads several transition alumina and α-alumina with highly porous vermicular microstructure as can be appreciated in Figure 4.…”

Section: Porous Ceramic Materials: Synthesis Methods and Characterizamentioning

confidence: 99%

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

Perera-Mercado¹,

León²,

Piñerez³

2018

Recent Advances in Porous Ceramics

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According to the American National Standards Institute (ANSI), a sensor is a device which provides a usable output in response to a specified measurement of a physical quantity converted into a signal suitable for processing (e.g., optical, electrical, or mechanical signals). On the other hand, porous ceramic materials play an important role as sensor materials, because by selecting a suitable base ceramic material for the intended use and then adjusting their overall porosity, pore size distribution, and pore shape, they can cover different applications such as liquid-gas filters, insulators, catalytic supports, mixed of gases separators and sensors, among others. In addition, they have controlled permeability, high melting point, high superficial area, high corrosion and wear resistance, low expansion coefficient, tailored electronic properties, etc. Currently, a few niche areas demand sensors for compact electronic device design, e.g., leak inspections for oil and gas dispositive, flammable and/or toxic gas detection in waste storage areas and confined spaces, hydrocarbons and their associated gas detection at low temperatures and high humidity conditions, among others. In this chapter, the advances in porous ceramic production for hydrocarbons and associated gas detection will be presented and discussed.

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Sol–Gel Synthesis of Mesoporous Alumina Considering the Simultaneous Effects of Preparation Parameters by Response Surface Methodology

Hosseinzadeh

Sarpoolaky

2019

J Inorg Organomet Polym

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Sol–Gel Aluminum Hydroxides and Their Thermal Transformation Studies for the Production of α-Alumina

Cited by 7 publications

References 31 publications

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

Sol–Gel Synthesis of Mesoporous Alumina Considering the Simultaneous Effects of Preparation Parameters by Response Surface Methodology

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Sol–Gel Aluminum Hydroxides and Their Thermal Transformation Studies for the Production of α-Alumina

Cited by 7 publications

References 31 publications

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al2O3Hybrids for Anti‐Counterfeiting and Information Encryption

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al2O3Hybrids for Anti‐Counterfeiting and Information Encryption

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

Sol–Gel Synthesis of Mesoporous Alumina Considering the Simultaneous Effects of Preparation Parameters by Response Surface Methodology

Contact Info

Product

Resources

About

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption

Synthesis of Visible Light Excitable Carbon Dot Phosphor‐Al₂O₃Hybrids for Anti‐Counterfeiting and Information Encryption