Sol–gel preparation and characterization of spherical ZrO2–SiO2 particles

Garbassi, F.; Balducci, Luigi; Ungarelli, Raffaele

doi:10.1016/s0022-3093(97)00447-x

Cited by 25 publications

(22 citation statements)

References 16 publications

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“…In this way, the already studied role played by TEAH 3 in order to orchestrate the hydrolytic reactions of the Si and Zr precursor species [36] is preserved in the current synthesis of the Zr-UVM-7 solids. Finally, once the hydrolytic reactions have been completed, the total concentration of soluble silica can be accounted for by Si(OH) 4 and (HO) 3 -SiO -species in an approximate ratio of 10:1.6, [57,58] while the majority Zr species should be the Zr(OH) 5 -mono-mer. [59] The subsequent condensation processes will proceed from these monomeric entities.…”

Section: Synthesis Strategymentioning

confidence: 99%

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

et al. 2006

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Silica-based nanoparticulated bimodal mesoporous materials with high Zr content (43 Ն Si/Zr Ն 4) have been synthesized by a one-pot surfactant-assisted procedure from a hydroalcoholic medium using a cationic surfactant (CTMABr = cetyltrimethylammonium bromide) as structure-directing agent, and starting from molecular atrane complexes of Zr and Si as hydrolytic inorganic precursors. This preparative technique allows optimization of the dispersion of the Zr guest species in the silica walls. The bimodal mesoporous nature of the final high surface area nano-sized materials is confirmed by XRD, TEM, and N 2 adsorption-desorption isotherms. The small intraparticle mesopore system (with pore sizes around 2-3 nm) is due to the supramolecular templating effect of the surfactant, while the large mesopores (around 12-24 nm) have their

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Section: Synthesis Strategymentioning

confidence: 99%

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

et al. 2006

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“…The preparation of monodisperse silica particles is of considerable importance for technological applications in the fields of ceramics, magnets, semiconductor, and chromatographic adsorbents [1][2][3]. Recently, the synthesis of coreshell colloidal particles has been extensively studied, because of the ease with which the magnetic, electrical, and optical properties of core particles can be altered by building a shell layer on a core [4,5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monodisperse fluorescent core-shell silica particles using a modified Stöber method for imaging individual particles in dense colloidal suspensions

Lee

Beyer

Furst

2005

Journal of Colloid and Interface Science

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“…Methods for preparation of spherical particles from an immiscible mixture of acid and alcohol have also been reported 26,27 . The other method synthesizes spherical silica particles by using a reaction field of W/O emulsion that is composed of a surfactant (or long‐chain alcohol), an organic solvent, and an aqueous solution 28–33 . In both methods, 4‐functional silicon alkoxides such as tetramethoxysilane and tetraethoxysilane (TEOS) were usually used 24,26–30,33 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Rhodamine B‐Doped and Monodispersed Spherical Particles of Polyorganosiloxane Using a W/O Emulsion

Matsumoto

Takayama

Onoda

et al. 2005

Journal of the American Ceramic Society

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Rhodamine B (RB)-doped and monodispersed spherical particles of polyorganosiloxane were synthesized by a sol-gel method from methyltrimethoxysilane (MTMS) using a reaction field of W/O emulsion that was formed from a hydrophobic solution of sorbitantrioleate (SPAN85) plus n-octane, and an aqueous solution of RB. Three different methods of introducing MTMS into the solution were examined. In the first method, MTMS was added only to the hydrophobic solution of SPAN85 and noctane. Although monodispersed spherical particles were synthesized by this method, RB was hardly doped in the spherical particles. In the second method, RB could be doped in spherical particles by introducing MTMS only into the aqueous solution of RB. However, the particle was not monodispersed, and several of pores were present in the particles, which was probably because of a deficiency of silanols in the water droplets in the emulsion. In the third method, above two methods were used together to obtain RB-doped and monodispersed spherical particles. Moreover, the pores in the particles were remarkably decreased. This is probably because sufficient amounts of silanols were supplied to the water droplets from the oil phase. The content of RB in the particles was different among the three methods. To incorporate RB into the spherical particle, the interaction between RB and silanol was found to play an important role. The RB-doped spherical particles were heat treated up to 6001C, and the thermal stability of RB was determined. In RB-doped spherical particles, transformation of T 2 into T 3 at 2001C was prevented and Si-OH still remained. Fluorescence was still observed in the RB-doped spherical particles heat treated at a high temperature of 3501C. Therefore, RB was considered to be incorporated tightly into the silica matrix containing Si-CH 3 . From the above results, we discussed the formation mechanism of RB-doped spherical particles.

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Sol–gel preparation and characterization of spherical ZrO2–SiO2 particles

Cited by 25 publications

References 16 publications

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

Synthesis of monodisperse fluorescent core-shell silica particles using a modified Stöber method for imaging individual particles in dense colloidal suspensions

Synthesis of Rhodamine B‐Doped and Monodispersed Spherical Particles of Polyorganosiloxane Using a W/O Emulsion

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