Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Pype, Judith; Michielsen, Bart; Seftel, Elena M.; Mullens, Steven; Meynen, Vera

doi:10.1016/j.jeurceramsoc.2016.07.020

Cited by 21 publications

(25 citation statements)

References 43 publications

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“…The size distribution of the spheres is correlated to the nozzle diameter, which controls the size of the droplets. As presented in an earlier work, a linear relation between the nozzle diameter and the average size of the microspheres was verified . With the nozzle diameter kept constant at 600 μm, the average microsphere size measured with the DLS technique results 675 ± 5 μm for the samples sintered at 1300 °C and 616 ± 5 μm for the samples sintered at 1650 °C.…”

Section: Resultssupporting

confidence: 75%

“…As presented in an earlier work, a linear relation between the nozzle diameter and the average size of the microspheres was verified. [40] With the nozzle diameter kept constant at 600 μm, the average microsphere size measured with the DLS technique results 675 ± 5 μm for the samples sintered at 1300°C and 616 ± 5 μm for the samples sintered at 1650°C. The higher sintering temperature results in the shrinking of the spheres.…”

Section: Resultsmentioning

confidence: 96%

“…Monodisperse alumina microspheres were shaped by making use of the vibrational droplet coagulation technique, with a Spheridisator M apparatus (Brace GmbH, Germany) . This technique makes use of the ionotropic gelation of sodium alginate, when in contact with a divalent cation, e.g., CaCl 2 .…”

Section: Methodsmentioning

confidence: 99%

“…Monodisperse alumina microspheres were shaped by making use of the vibrational droplet coagulation technique, with a Spheridisator M apparatus (Brace GmbH, Germany). [40] This technique makes use of the ionotropic gelation of sodium alginate, when in contact with a divalent cation, e.g., CaCl 2 . α-Alumina powder was loaded in a sodium alginate solution in combination with a dispersing agent (Darvan C), in order to obtain a stable ceramic suspension.…”

Section: Synthesis Of Alumina Microspheresmentioning

confidence: 99%

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Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Trulli

Claes

Pype

et al. 2017

Plasma Processes & Polymers

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Advances in the synthesis of porous microspheres and in their functionalization are increasing the interest in applications of alumina. This paper deals with coatings plasma deposited from 3‐aminopropyltriethoxysilane by means of dielectric barrier discharges on alumina porous microspheres, shaped by a vibrational droplet coagulation technique. Aims of the work are the functionalization of the particles with active amino groups, as well as the evaluation of their surface coverage and of the penetration of the coatings into their pores. A multi‐diagnostic approach was used for the chemical/morphological characterization of the particles. It was found that 5 min exposure to plasma discharges promotes the deposition of homogeneous coatings onto the microspheres and within their pores, down to 1 μm.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Alumina Microspheresmentioning

confidence: 99%

See 2 more Smart Citations

Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Trulli

Claes

Pype

et al. 2017

Plasma Processes & Polymers

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“… Schematic overview as presented by Pype et al. of the vibrational droplet coagulation set‐up, consisting of (1) a feed vessel with magnetic stirrer, (2) an air pressure controller, (3) a vibration generator with frequency and amplitude control, (4) a nozzle, (5) a stroboscopic lamp and (6) a coagulation bath.…”

Section: Methodsmentioning

confidence: 99%

Enhancing Zeolite Performance by Catalyst Shaping in a Mesoscale Continuous‐Flow Diels–Alder Process

et al. 2018

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In contrast to most lab‐scale batch procedures, a continuous‐flow implementation requires a thorough consideration of the solid catalyst design. In a previous study, irregular zeolite pellets were applied in a miniaturized continuous‐flow reactor for the Diels–Alder reaction in the construction of norbornene scaffolds. After having faced the challenges of continuous operation, the aim of this study is to exploit catalyst structuring. To this end, microspheres with high uniformity and various sphere diameters were synthesized according to the vibrational droplet coagulation method. The influence of the use of these novel zeolite shapes in a mesoscale continuous‐flow Diels–Alder process of cyclopentadiene and methyl acrylate is discussed. An impressive enhancement of catalyst lifetime is demonstrated, as even after a doubled process time of 14 h, the microspheres still exceeded the conversion after 7 h when using zeolite pellets by 30 %. A dual reason is found for this beneficial impact of catalyst shaping. The significant improvement in catalyst longevity can be attributed to the interplay of the chemical composition and the porosity structure of the microspheres.

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Impact of Molecular Weight of Oxidized Lignin on its Coagulation Performance in Aluminum Oxide Suspension

Gao

Beery

Kong

et al. 2022

Waste Biomass Valor

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Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Cited by 21 publications

References 43 publications

Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Enhancing Zeolite Performance by Catalyst Shaping in a Mesoscale Continuous‐Flow Diels–Alder Process

Impact of Molecular Weight of Oxidized Lignin on its Coagulation Performance in Aluminum Oxide Suspension

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Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Cited by 21 publications

References 43 publications

Deposition of aminosilane coatings on porous Al2O3 microspheres by means of dielectric barrier discharges

Deposition of aminosilane coatings on porous Al2O3 microspheres by means of dielectric barrier discharges

Enhancing Zeolite Performance by Catalyst Shaping in a Mesoscale Continuous‐Flow Diels–Alder Process

Impact of Molecular Weight of Oxidized Lignin on its Coagulation Performance in Aluminum Oxide Suspension

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Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges

Deposition of aminosilane coatings on porous Al₂O₃ microspheres by means of dielectric barrier discharges