Fluidization and agglomerate structure of SiO2 nanoparticles

Wang, Yao; Gu, Guangsheng; Wei, Fei; Wu, Jun

doi:10.1016/s0032-5910(01)00491-0

Cited by 222 publications

(157 citation statements)

References 7 publications

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“…Nanoparticles are associated with large surface area and conglomerated property. [46] On the other hand, micron particle are associated with comparatively small surface area and nonconglomerated property. [47] Present study was interested in the synthesis of microbeads using suspension polymerization.…”

Section: Particle Size Distributionmentioning

confidence: 99%

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

Mane

Ponrathnam

Chavan

2015

Designed Monomers and Polymers

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Conventional crosslinked polymers and homopolymers both have their own limitations. As a result, core-shell polymer was synthesized to obtain cauliflower-shaped and highly hydroxyl functionalized polymer. For the core, acrylate-based copolymers were synthesized by varying crosslinkers and porogens at different crosslink density. Owing to high surface area (554 m 2 /g), poly(MMA-co-DVB) was used as a core and low-molecular weight (24,600 g/mol) poly(GMA) was used as a shell in core-shell approach. Average particle sizes of the core polymers were in the range of 15-75 μm. In order to evaluate reactivity efficiency of core-shell polymer, hydroxyl content was evaluated with a value of 3.97 mmol/ g. Importantly, hydroxyl content demonstrated the successful increase in reactive sites of the core-shell polymer over conventional crosslinked hydroxyl polymer. Notably, synthesized core-shell polymer has more surface area and pore volume which substantially attributes for better polymer efficiency during application. Scanning electron microscopy images revealed the spherical, uniform, and slightly conglomerated properties of core-shell polymer. Due to higher reactivity, insolubility, and more surface area of hydroxyl functionalized core-shell polymer, its use become inevitably essential.

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Section: Particle Size Distributionmentioning

confidence: 99%

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

Mane

Ponrathnam

Chavan

2015

Designed Monomers and Polymers

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“…Two distinct behaviors can be observed in nanoparticles fluidization, termed agglomerate particulate fluidization (APF) and agglomerate bubbling fluidization (ABF) [1][2]. The APF is characterized by smooth fluidization, high bed expansion and uniform distribution of agglomerates throughout the bed [1] while the ABF exhibits large bubbles and the low bed expansion ratio by increasing the gas velocity [1].…”

Section: Introductionmentioning

confidence: 99%

“…The APF is characterized by smooth fluidization, high bed expansion and uniform distribution of agglomerates throughout the bed [1] while the ABF exhibits large bubbles and the low bed expansion ratio by increasing the gas velocity [1]. Smooth fluidization leads to formation of highly porous agglomerates in the range of several hundred microns Agglomerates show dynamic behavior during fluidization, breaking and forming again continuously.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on the Nanoparticles Agglomerates Fluidization

Esmailpour¹,

Zarghami²,

Mostoufi³

2015

Proceedings of the 2015 International Conference on Modeling, Simulation and Applied Mathematics

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Abstract-The effect of temperature on the fluidization behavior of nanoparticles agglomerates in a fluidized bed was investigated. Moreover, a model was developed based on the force balance between drag, collision, buoyancy and gravitational forces as separation forces and van der Waals force as the attractive force. Results showed that the size of agglomerates decrease by increasing the gas velocity at constant temperature. In addition, the minimum fluidization velocity and the agglomerate size increase with increasing the temperature due to increasing the van der Waals cohesive force. The agglomerate size calculated by the present model is in good agreement with the experimental data.

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“…Fluidized beds are widely used in the chemical industry in a variety of reactive and non-reactive processes. Aerosol generation is a less common application but nevertheless fluidized beds have also been used for decades to generate aerosols of relatively coarse particles (Guichard 1976), and more recently for nanoparticles (Wang et al 1998;Yao et al 2002). Myojo et al (2009) reported the use of a fluidized bed to homogenize the supply of multi-walled carbon nanotubes from a rotating brush aerosol generator, giving concentrated carbon nanotube aerosols for limited experimental times (under 1 h of operation).…”

Section: Introductionmentioning

confidence: 99%

Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

Clemente¹,

Balas²,

Lobera³

et al. 2013

Aerosol Science and Technology

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A long-lasting generator of continuous silica nanoparticle aerosols based in a fluidized bed of glass beads coated with nanosized silica has been developed. The attrition resulting from the bubbling fluidized bed regime progressively detaches the silica coating from the glass beads, giving rise to a steady production of silica nanosized aerosols with median diameters from 100 to 250 nm depending on the initial size of the coating nanoparticles. Continuous aerosol production could be maintained for more than 12 h, and the nanoparticle concentration can be easily tuned in the range of 2000 to 14,000 #/cm 3 by adjusting the fluidization and/or dilution flow rates.

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Fluidization and agglomerate structure of SiO2 nanoparticles

Cited by 222 publications

References 7 publications

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

Design and synthesis of cauliflower-shaped hydroxyl functionalized core-shell polymer

Effect of Temperature on the Nanoparticles Agglomerates Fluidization

Fluidized Bed Generation of Stable Silica Nanoparticle Aerosols

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