Dependence of Boehmite Thermal Evolution on Its Atom Bond Lengths and Crystallite Size

Bokhimi, Xim; Toledo-Antonio, J.A.; Guzman-Castillo, Maria; Mar-Mar, B.; Hernández-Beltrán, F.; Navarrete, Juan T. López

doi:10.1006/jssc.2001.9320

Cited by 99 publications

(70 citation statements)

References 33 publications

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“…5a-c) and Rietveld analysis of the XRD patterns (Supplementary Table 2 and Supplementary Note 4). The latter shows that the average crystallite size along the [010] direction (so the stacking direction of the AlOOH layers) is considerably shorter than the in plane direction [001], which is the most typical signature of boehmite nanoplatelets as discussed in several articles [46][47][48][49] . Carbon, hydrogen and nitrogen (CHN) elemental analysis shows that the carbon content, and therefore the quantity of benzoate species attached to the particle surface generally increases with the reaction temperature (Supplementary Table 1 and Supplementary Note 1).…”

Section: Resultsmentioning

confidence: 99%

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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White light-emitting diodes (WLEDs) are candidates to revolutionize the lighting industry towards energy efficient and environmental friendly lighting and displays. The current challenges in WLEDs encompass high luminous efficiency, chromatic stability, high colourrending index and price competitiveness. Recently, the development of efficient and low-cost downconverting photoluminescent phosphors for ultraviolet/blue to white light conversion was highly investigated. Here we report a simple route to design high-efficient WLEDs by combining a commercial ultraviolet LED chip (InGaAsN, 390 nm) and boehmite (g-AlOOH) hybrid nanoplates. Unusually high quantum yields (Z yield ¼ 38-58%) result from a synergic energy transfer between the boehmite-related states and the triplet states of the benzoate ligands bound to the surface of the nanoplates. The nanoplates with Z yield ¼ 38% are able to emit white light with Commission International de l'Eclairage coordinates, colour-rendering index and correlated colour temperature values of (0.32, 0.33), 85.5 and 6,111 K, respectively; overwhelming state-of-the-art single-phase ultraviolet-pumped WLEDs phosphors.

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Section: Resultsmentioning

confidence: 99%

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

et al. 2014

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“…The boehmite with small crystallite size exhibits a gradual weight loss, whereas the boehmites with larger crystallite size show a steep weight loss around 450 o C. This is related to the hydrogen-bond strength between double layers, which is associated with the hydrogen-bond length. 26,29 This bond length decreases as boehmite crystallite size increases, indicating that the corresponding bond energy becomes stronger. Therefore, boehmites with lager crystallite size require more energy than that of the small crystallite to break the hydrogen-bond, and the different weight loss occurs depending upon the boehmite crystallite size.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Porosity of Colloidal Boehmite Sol by Controlling Crystallite Size

Park¹,

Lee²,

Kim³

et al. 2012

Bulletin of the Korean Chemical Society

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Boehmite sols have been prepared by crystallization of amorphous aluminum hydroxide gel obtained by hydrolysis and peptization of aluminum using acetic acid. The size of the boehmite crystallites could be controlled by Al molar concentration in amorphous gel by means of controlling grain growth at nucleation stage. The size of boehmite increases as a function of Al molar concentration. With increasing boehmite crystallite size, the d(020) spacing and the specific surface area decreases, whereas the pore volume increases along with pore size. Especially, the pore size of the boehmite sol particles is comparable to the crystallite size along the b axis, suggesting that the fibril thickness along the b axis among the crystallite dimensions of the boehmite contributes to the pore size. Therefore, the physical properties of boehmite sols can be determined by the crystallite size controlled as a function of initial Al concentration.

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“…The length of the aggregation of some nanorod particles is about 120nm, and the diameter is about 40nm. The sample obtained from Al(NO 3 ) 3 shows that some rodlike particles keep partially as before, and another particles break into fragments during the calcination process compared to the precursor (see Fig. 1(C)).…”

Section: B Effect Of Anions On Thermal Decomposition Behaviors Of Asmentioning

confidence: 93%

“…2(B) shows the Xray diffraction patterns obtained from calcination of AACH obtained from Al(NO 3 ) 3 in the temperature range 300-1100°C. During thermal treatment, the following series of phase transformations take place to form α-Al 2 O 3 [11,12]: 3 and AlCl 3 calcined at 500°C for 4h. The pore volume should be attributed to the intercrystallite voids of the randomly stacked alumina nanostructure.…”

Section: B Effect Of Anions On Thermal Decomposition Behaviors Of Asmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Anions during a Solid-state Reaction Preparation of Ammonium Aluminum Carbonate Hydroxide

Hu¹,

Tang²,

Liu³

et al. 2012

Proceedings of the 1st International Conference on Mechanical Engineering and Material Science

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Dependence of Boehmite Thermal Evolution on Its Atom Bond Lengths and Crystallite Size

Cited by 99 publications

References 33 publications

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Efficient and tuneable photoluminescent boehmite hybrid nanoplates lacking metal activator centres for single-phase white LEDs

Tailoring Porosity of Colloidal Boehmite Sol by Controlling Crystallite Size

Effect of Anions during a Solid-state Reaction Preparation of Ammonium Aluminum Carbonate Hydroxide

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