Syntheses of mesoporous zirconia with anionic surfactants

Pacheco, G.; Zhao, Eric; Garcı́a, Adriana; Sklyarov, A.; Fripiat, J. J.

doi:10.1039/a703819d

Cited by 76 publications

(44 citation statements)

References 11 publications

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“…Ever since, a variety of surfactants as structure-directing agents to form mesoporous ZrO 2 via sol-gel route were utilized. Four classes of surfactants, which have been used as a template for synthesis of mesoporous ZrO 2 , can be categorized based on the nature of their hydrophilic functionality: (1) anionic [35][36][37]; (2) cationic [4,11,33,34,38,39];…”

Section: Introductionmentioning

confidence: 99%

Design of hierarchically meso–macroporous tetragonal ZrO2 thin films with tunable thickness by spin-coating via sol–gel template route

Soo

Kawamura

Muto

et al. 2013

Microporous and Mesoporous Materials

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Section: Introductionmentioning

confidence: 99%

Design of hierarchically meso–macroporous tetragonal ZrO2 thin films with tunable thickness by spin-coating via sol–gel template route

Soo

Kawamura

Muto

et al. 2013

Microporous and Mesoporous Materials

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“…Almost simultaneously, Pacheco et al 16,17 and Larsen et al 18 reinvestigated the preparation of mesoporous zirconium oxide using anionic surfactants, where Pacheco et al concluded on the same scaffolding mechanism. In their syntheses, the fixation of phosphate or sulfate in the walls helped to preserve the porous structure at 500 uC.…”

Section: Introductionmentioning

confidence: 99%

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

et al. 2003

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In order to control the reactivity of the inorganic precursor and the hybrid formation, the evaporation induced self-assembly procedure (EISA) has been applied to direct alkyl amines into zirconia hybrid composites. It is demonstrated that, with controlled water amounts, a mesostructured wormhole-like high-surface-area zirconia can be formed but the mesostructure collapses due to massive crystallisation of the zirconia walls into tetragonal zirconia as the calcination temperature rises to 400 uC. To overcome the lack in thermal stability, zirconia hybrids are treated in aqueous ammonia to protect the primary particles in the zirconia walls against uncontrolled particle growth and crystallisation. The growth of the initially amorphous zirconia particles in the walls is limited by increasing the condensation degree upon ammonia treatment resulting in mesostructured zirconia consisting of nanosized 'tetragonal' particles at higher temperatures. It is shown that the alkalinetreated zirconias have a remarkable thermal stability with retention of most physical characteristics such as high surface area, pore volume and mesoporosity up to a temperature of 800 uC.

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“…15 Recently, self-assembled highly crystalline thermally stable zirconias have been considered as important materials due to their several unique properties. 16,20 A series of self-assembled ordered superstructured zirconia materials have been successfully synthesized by the use of surfactants such as anionic surfactants, [17][18][19] blockcopolymers, 20 cationic surfactants 21 and composite surfactants. 22 Unfortunately, in most cases, the ordered superstructured zirconia that are synthesized are still far from satisfactory and their crystalline framework and corresponding superstructure collapses during subsequent crystallization or heat treatment; thus the synthesis of thermostable self-assembled ordered lamellar superstructured crystalline zirconia remains a great challenge, which severely hinders practical applications.…”

Section: Introductionmentioning

confidence: 99%

Brij-58 template synthesis of self-assembled thermostable lamellar crystalline zirconia via a reflux-hydrothermal hybrid method

Liu

et al. 2015

RSC Adv.

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Using polyoxyethylene-20-cetyl-ether (Brij-58) as a supramolecular template, thermostable lamellar crystalline zirconia (TSLCZ) was synthesized though the reflux-hydrothermal hybrid method (R-HT) with ZrOCl 2 $8H 2 O as the zirconium source and sodium hydroxide as the precipitating agent. The TSLCZs were characterized by XRD, TEM, SAED, FE-SEM, TG-DTA and FTIR. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses showed that zirconia is the only crystal phase in TSLCZ and Brij-58 promoted zirconia nucleation and 2D-growth and induced self-ordered lamellar nanostructured assembly. Transmission electron microscopic (TEM) observations further proved this regular lamellar structure, which was detected by XRD. The repeat periodicity of the structure is about 1.20 nm, as observed by TEM, which is in well accordance with the XRD data (1.19 nm). The selected area electron diffraction (SAED) results indicate that TSLCZ is a polycrystalline structure. XRD, TEM and field emission scanning electron microscopy (FE-SEM) results show that the TSLCZ can be well preserved even after a high temperature thermal treatment at 500 C for 2 h. Moreover, the R-HT significantly promoted the Brij-58 directed synthesis of TSLCZ in the three aspects of heterogeneous nucleation, controlled 2-D growth and ordered lamellar self-assembly as compared to only the reflux (R) or hydrothermal (HT) method. The possible formation of the TSLCZ could be explained by the use of the surfactant template.

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Syntheses of mesoporous zirconia with anionic surfactants

Cited by 76 publications

References 11 publications

Design of hierarchically meso–macroporous tetragonal ZrO2 thin films with tunable thickness by spin-coating via sol–gel template route

Design of hierarchically meso–macroporous tetragonal ZrO2 thin films with tunable thickness by spin-coating via sol–gel template route

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

Brij-58 template synthesis of self-assembled thermostable lamellar crystalline zirconia via a reflux-hydrothermal hybrid method

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