A new technique for preparing ceramics for catalyst support exhibiting high porosity and high heat resistance

Yokota, Toshiyuki; Takahata, Yasuyuki; Katsuyama, Tetsuo; Matsuda, Yoshihisa

doi:10.1016/s0920-5861(01)00349-2

Cited by 24 publications

(7 citation statements)

References 3 publications

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“…The shape and size of the granules are controlled by the solution rheology, spray flow rate, and gas pressure in the atomizer. Highly porous, temperature-resistant magnesia ceramics were obtained by spraying aqueous magnesium sulfate into n-hexane [42]. A citrate precursor was used [43] to prepare LaCoO 3 perovskites by SFD and using a calcination temperature much lower than in other conventional methods, resulting in a larger specific surface (23.7 instead of 5 m 2 /g).…”

Section: Spray-freeze-dryingmentioning

confidence: 99%

Pigments Based on Perovskite

Ardit

Cruciani

Dondi

et al. 2015

Perovskites and Related Mixed Oxides

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Section: Spray-freeze-dryingmentioning

confidence: 99%

Pigments Based on Perovskite

Ardit

Cruciani

Dondi

et al. 2015

Perovskites and Related Mixed Oxides

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“…The preparation of particles by this method was created with the target of maintaining a strategic distance of pressing aids to the particle surface Lyckfedt et al 6 However, it is extremely restricted when contrasted with spray drying. A principle highlight of freeze drying as a nanoformulation strategy is that the acquired nanoparticles have high porosity thus light granules can be produced Uchida et al, 17 Yokota et al 18 The porosity and subsequently, the thickness of particles are controlled by the strong stacking of the suspensions, though the size distribution of the particles is a component of the viscosity and the solid substance of the suspension, the streaming rate utilized for spraying and the pressure of the connected gas Moritz et al 10 and Rundgren et al 19 The present research envisaged reformulating PQ to enhance its efficacy and half-life, which may impact on its dosing regimen by enabling lower dosage and longer frequency. These will lead to reduced toxicity and better patient compliance.…”

Section: Introductionmentioning

confidence: 99%

Optimization and characterization of primaquine-loaded solid lipid nanoparticles (SLN) for liver schinonticide targeting by freeze drying

Owuor

Oloo

Ouma

et al. 2017

MOJDDT

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The aim of this study was preparation of a liver schinonticide Primaquine phosphate (PQ) directly to the hepatocytes using solid lipid nanoparticles (SLN). The PQloaded solid lipid nanoparticles (PQ-SLNs) were prepared by a modified solvent emulsification evaporation method based on a water-in-oil-in-water (w/o/w) double emulsion and dried freeze drying (PQ-SLNFD) to obtain the nanoparticles. The mean particle size, zeta potential, drug loading, and encapsulation efficiency of the PQ-SLNFD were 236nm, +23 mV, 14%, and 75%, respectively. A spherical morphology of PQ-SLNFD was seen by scanning electron microscope had traces of drug crystals. In vitro, release profile depicted a steady drug release over 400 hours for PQ-SLNFD. Differential scanning calorimeter thermograms demonstrated presence of drug in drug-loaded nanoparticles along with disappearance of decomposition exotherms, suggesting increased physical stability of drug in prepared formulations. The nanoformulated PQ was 20% more effective as compared with conventional oral dose when tested in Plasmodium berghei-infected Swiss albino mice. This study established an effective process of developing a nanomedicine delivery system for PQ.

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“…[17][18][19] The porosity and consequently, the density of granules are controlled by the solid loading of the suspensions, whereas the size distribution of the granules is a function of the viscosity and the solid content of the suspension, the flow rate employed for spraying and the pressure of the applied gas. 18,20 In this work commercial suspensions of colloidal alumina and titania have been used, as well as a mixture of both prepared to a weight ratio of 87/13, in order to compare the two selected granulation methods, spray drying and freeze drying, and the physicochemical characteristics of the obtained granules such as their morphology, surface area, and size distribution as a function of the suspension preparation conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of freeze drying and spray drying to obtain porous nanostructured granules from nanosized suspensions

Vicent

Sánchez

Molina

et al. 2012

Journal of the European Ceramic Society

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Spray drying and freeze drying are well established granulation processes for submicron and micron sized particles. In recent years, granulation of nanoparticle suspensions is receiving increased interest for the production of nanostructured materials.In this work the spray drying and freeze drying of different nanosized ceramic materials and the physicochemical characteristics of the obtained granules (size distribution, morphology, surface area, porosity, and flow parameters) are studied. Commercial colloidal suspensions of alumina and titania were studied, as well as a mixture of both with a relative weight ratio of 87/13. On one hand, the influence of temperature, pressure and nozzle diameter on the morphology and characteristics of spray dried granules are studied. On the other hand, the effect of air pressure and nozzle diameter on the morphology and properties of freeze dried granules was evaluated. The influence of solids loading of the starting suspensions has been also studied.It has been demonstrated that these processing parameters have practically no influence on the granules morphology and properties, and the only parameter determining the granules characteristics is the solids content of the suspensions, either in the spraying or in the freezing process. Spray drying leads to a monomodal distribution with higher granule size, while freeze drying produces more porous granules, with a bimodal intragranular distribution. The flowability of spray-dried powder is better than that of the freeze-dried powder. As a result, the characteristics of the spray-dried powder suit better the requirements of a feedstock targeted to obtain coatings by plasma thermal spraying whereas freeze drying can produce high porosity, softer granules.

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A new technique for preparing ceramics for catalyst support exhibiting high porosity and high heat resistance

Cited by 24 publications

References 3 publications

Pigments Based on Perovskite

Pigments Based on Perovskite

Optimization and characterization of primaquine-loaded solid lipid nanoparticles (SLN) for liver schinonticide targeting by freeze drying

Comparison of freeze drying and spray drying to obtain porous nanostructured granules from nanosized suspensions

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