Relationship between Crystallite Size and Bond Lengths in Boehmite

Bokhimi, Xim; Toledo-Antonio, J.A.; Guzman-Castillo, Maria; Hernández-Beltrán, F.

doi:10.1006/jssc.2001.9124

Cited by 144 publications

(118 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 chemical structure of boehmite (γ-AlO(OH)) is assumed to be of the cmcm unit cell (see Figure 1 a)), as reported by Bokhimi et al [18] and experimentally confirmed through X-ray diffraction carried out at the Institute for Particle Technology of the TU Braunschweig [19]. The primary particle size of the particles is in the range of 14 Å and the particles have an orthorhombic shape, as shown in All models are generated with in-house software using Open Babel [20] and Packmol [21].…”

Section: Materials and Modelsmentioning

confidence: 99%

Simulating Atomic Force Microscopy for the Determination of the Elastic Properties of Nanoparticle Reinforced Epoxy Resin

Fankhänel¹,

Kempe²,

Rolfes³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…Its contribution depends on the number of Al ions and the relative Al-O bond length. For boehmite, it has been found that the Al-O bond lengths in the Al coordination sphere depend on the crystallite size (Bokhimi et al, 2001). In small, nano-sized particles, the octahedron is more distorted.…”

Section: Surface Chargementioning

confidence: 99%

“…In small, nano-sized particles, the octahedron is more distorted. We have calculated the affinity constant for the surface protonation reactions of singly and doubly coordinated surface groups, using the experimental bond lengths reported by (Bokhimi et al, 2001) for the very small (d 020 % 1-2 nm) and the large (d 020 % 10-20 nm) particles. These particle sizes are equivalent with a calculated specific surface area (flat rhombuses) of respectively about 800 to 500 and 80 to 50 m 2 /g.…”

Section: Surface Chargementioning

confidence: 99%