Size tailoring of oxide nanoparticles by precipitation in aqueous medium. A semi-quantitative modelling

Jolivet, Jean‐Pierre; Froidefond, Cédric; Pottier, Agnès; Chanéac, Corinne; Cassaignon, Sophie; Tronc, E.; Euzen, P.

doi:10.1039/b407086k

Cited by 192 publications

(184 citation statements)

References 28 publications

(38 reference statements)

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“…In figure 1 TEM images are shown for the three ripening conditions investigated in this work. The nanoparticles ripened at 95C for 1 week form a predominantly Boehmite phase with large 50-100 nm platelets, similar to the observation of Jolivet et al 5 Ripening for 1 week at 160 C forms longer rod shaped particles between 100-150 nm of the Bayerite phase. Finally ripening at 160 C for 17 hours has been found to form an Er-Al-oxide phase, as indicated by the corresponding XRD pattern (not shown).…”

Section: Resultssupporting

confidence: 71%

Nanoparticle doping for improved Er-doped fiber lasers

et al. 2016

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A nanoparticle (NP) doping technique was used for making erbium-doped fibers (EDFs) for high energy lasers. The nanoparticles were doped into the silica soot of preforms, which were drawn into fibers. The Er luminescence lifetimes of the NP-doped cores are longer than those of corresponding solution-doped silica, and substantially less Al is incorporated into the NP-doped cores. Optical-to-optical slope efficiencies of greater than 71% have been measured. Initial investigations of stimulated Brillouin scattering (SBS) have indicated that SBS suppression is achieved by NP doping, where we observed a low intrinsic Brillouin gain coefficient, of ~1× 10 -11 m/W and the Brillouin bandwidth was increased by 2.5x compared to fused silica.

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Section: Resultssupporting

confidence: 71%

Nanoparticle doping for improved Er-doped fiber lasers

et al. 2016

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“…far from the point of zero charge of amorphous silica which is close to 2. The particle surfaces are thus charged and this is known to decrease the oxide-solution interfacial tension 47 . The σ values that we have determined significantly decrease when temperature is raised.…”

Section: A Discussion Of the Parameter Valuesmentioning

confidence: 99%

Precipitation mechanism of amorphous silica nanoparticles: A simulation approach

Noguera

Fritz

Clément

2015

Journal of Colloid and Interface Science

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Hypothesis: Despite its importance in numerous industrial and natural processes, many unsolved questions remain regarding the mechanism of silica precipitation in aqueous solutions: order of the reaction, role of silica oligomers, existence of an induction time and characteristics of the particle population. This may be traced back, in past models, to the lack of account of the first stages of nucleation, size dependence of the growth law, and full particle population.Computational method: A microscopic description of the nucleation and growth of amorphous silica nanoparticles is achieved which reproduces a large set of experimental measurements, under various thermodynamic conditions. The time evolution of the solution supersaturation and of the precipitate characteristics is established.Findings : A growth law of order 6 allows reproducing experimental results, without being correlated to the presence of silica oligomers in the aqueous solution. The saturation plateaus are shown not to be due to an induction period. The characteristics of the particle population are more complex than assumed by simple precipitation models (Johnson-Mehl-Avrami-Kolmogorov or Chronomal models) and strongly depend on how supersaturation is reached. Such a microscopic approach thus proves to be well suited to elucidate the mechanism of nanoparticle formation in natural and industrial contexts.

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“…Nanoparticle doping can be used to minimize these effects since the nanoparticles can serve to isolate the dopant from the SiO 2 glass. Foundational work in NP doping was performed in erbium doped fibers, where Er 3+ -doped boehmite (Er:AlOOH) nanoparticles were synthesized by the aqueous co-precipitation of Er and Al precursors; the particles were ripened and underwent subsequent thermal processing to form stable Er:Al 2 O 3 NPs [4][5][6]. Nanoparticle doping using LaF 3 hosts was achieved by Kucera et al [7] where tailored emission spectra were demonstrated, indicating effective isolation of RE 3+ ions.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle doping for high power fiber lasers at eye-safer wavelengths

et al. 2017

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Abstract:A nanoparticle (NP) doping technique was developed for fabricating erbium (Er)-and holmium (Ho)-doped silica-based optical fibers for high energy lasers. Slope efficiencies in excess of 74% were realized for Er NP doping in a single mode fiber based master oscillator power amplifier (MOPA) and 53% with multi-Watt-level output in a resonantly cladding-pumped power oscillator laser configuration based on a double-clad fiber. Cores comprising Ho doped LaF 3 and Lu 2 O 3 nanoparticles exhibited slope efficiencies as high as 85% at 2.09 µm in a laser configuration. To the best of the authors' knowledge, this is the first report of a holmium nanoparticle doped fiber laser as well as the highest efficiency and power output reported from an erbium nanoparticle doped fiber laser.

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Size tailoring of oxide nanoparticles by precipitation in aqueous medium. A semi-quantitative modelling

Cited by 192 publications

References 28 publications

Nanoparticle doping for improved Er-doped fiber lasers

Nanoparticle doping for improved Er-doped fiber lasers

Precipitation mechanism of amorphous silica nanoparticles: A simulation approach

Nanoparticle doping for high power fiber lasers at eye-safer wavelengths

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