Review of supercritical fluids in inorganic materials science

Aymonier, Cyril; Loppinet-Serani, Anne; Reverón, Helen; Garrabos, Yves; Cansell, François

doi:10.1016/j.supflu.2006.03.019

Cited by 271 publications

(175 citation statements)

References 66 publications

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“…However, these techniques generally require long reaction times (several hours) and complex multistep operations [1-43, 47, 48]. Recently, supercritical fluids have been applied in the synthesis of size-and morphology-controlled inorganic-organic hybrid metal and MO NPs [49][50][51][52][53][54][55][56][57][58][59][60][61]. All of these reported NP syntheses occur rapidly in supercritical fluids (several seconds to several minutes) [56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

Wang

Kobiro

2014

Pure and Applied Chemistry

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A simple, rapid (10 min), one-pot, single-step method for the preparation of solid and hollow spherical porous TiO 2 nanoparticles with large surface areas (100-211 m 2 /g) was developed in supercritical alcohols using carboxylic acids as organic additives. The shell thickness of the hollow TiO 2 nanoparticles (20-280 nm) was controlled by adjusting the heating rate (2.0-10.0 °C/min). The preparation of different spherical porous metal oxide nanoparticles, including CeO 2 , SiO 2 , TiO 2 , ZrO 2 , and ZnO, demonstrated the versatility of the synthetic approach. In addition, several rare earth-doped spherical mesoporous metal oxide nanoparticles, including CeO 2 :Er, CeO 2 :Er,Yb, ZrO 2 :Er, and TiO 2 :Er, which exhibit energy upconversion emission, were successfully prepared using this one-pot, single-step, supercritical methanol method. The obtained spherical mesoporous CeO 2 :Er and CeO 2 :Er,Yb nanoparticles emit green light upon excitation, even when irradiated with a low-power IR laser (980 nm, 10 mW) without calcination. Several other (metal) elements were also easily doped into spherical, mesoporous TiO 2 nanoparticles, such as Eu, Ce, Yb, Fe, and N, using a similar procedure. Furthermore, the spherical mesoporous TiO 2 nanoparticles were successfully applied as a new material for the transport of DNA via biolistic bombardment.

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Section: Introductionmentioning

confidence: 99%

Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

Wang

Kobiro

2014

Pure and Applied Chemistry

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“…Supercritical ethanol (scEtOH) yields monodisperse metal nanoparticles [29], supercritical methanol (scMeOH) [30,31] or supercritical water (SCW) [32] yields zinc oxide (ZnO) nanoparticles, while SCW alone yields CeO 2 [33], TiO 2 [34], and magnetite (Fe 3 O 4 ) [35] nanoparticles. All of these reactions proceed in a short reaction time (several seconds to several minutes) [36][37][38][39][40][41]. However, a versatile synthetic method for MARIMO nanoparticles in supercritical fluids has yet to be established.…”

Section: Introductionmentioning

confidence: 99%

Versatility of one-pot, single-step synthetic approach for spherical porous (metal) oxide nanoparticles using supercritical alcohols

Wang

Ueno

Takigawa

et al. 2013

The Journal of Supercritical Fluids

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We developed a rapid, one-pot, single-step synthetic method for preparing spherical porous (metal) oxides, titanium dioxide, silica, zirconium dioxide, cerium dioxide, and zinc oxide with large surface areas in a supercritical alcohol containing formic acid or phthalic acid as organic additive in a very short reaction time (10 min). A new type of hollow TiO 2 nanoparticle was obtained by slowly heating the reaction mixtures. The shell thickness of hollow TiO 2 nanoparticles was controlled by adjusting the heating rate.The method proved highly versatile for synthesizing solid and hollow spherical meso/microporous nanoparticles. The spherical mesoporous TiO 2 nanoparticles photocatalytically degraded methylene blue in water under UV irradiation, and successfully transported DNA under biolistic bombardment.

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“…The widely used solvents in SCF synthesis as reported in literature are CO 2 , H 2 O, CO 2 with alcohol, and alcohol [6,7]. Low carbon alcohols are frequently being used as solvent because they can act both as solvent and a reducing agent at supercritical condition [8].…”

Section: Introductionmentioning

confidence: 99%

Characterization of cerate–zirconate ceramic powder prepared by a high-pressure–high-temperature batch-wise reactor system

et al. 2014

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A supercritical technique was proposed to synthesise cerate-zirconate ceramic compound by a highpressure-high-temperature batch-wise reactor system. TG thermogram of the dried powders for all samples showed three stages of weight loss. Each stage is corroborated by one or two exothermic peaks as shown in DTG signal. A complete thermal decomposition for all samples is accomplished at *977°C for 2 h. FT-IR and XRD patterns showed the traces of carbonate residue in the calcined samples is due to the incomplete combustion of intermediate compounds. The presence of secondary phases, namely, BaZrO 3 , BaCeO 3 , BaO 2 and CeO 2 as detected by XRD measurement indicates that the calcined samples are not in a single phase of cerate-zirconate compound.

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Review of supercritical fluids in inorganic materials science

Cited by 271 publications

References 66 publications

Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

Versatility of one-pot, single-step synthetic approach for spherical porous (metal) oxide nanoparticles using supercritical alcohols

Characterization of cerate–zirconate ceramic powder prepared by a high-pressure–high-temperature batch-wise reactor system

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