Granulation of hydrophobic powders

Hapgood, Karen; Khanmohammadi, Batool

doi:10.1016/j.powtec.2008.04.033

Cited by 97 publications

(79 citation statements)

References 32 publications

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“…These preliminary results [2] suggested that bulk motion of the drop due to the kinetic energy of either rolling or impact, is critical for liquid marble formation. This agreed with other observations of liquid marble formation at pilot scale [3], where the use of higher mixer impeller speed to increase the level of agitation and overall kinetic energy applied during mixing was found to be crucial to effectively encapsulating the water in a shell of hydrophobic powder.…”

Section: Accepted M Manuscriptmentioning

confidence: 83%

“…3 A previous study [2] of liquid marble formation on a loosely packed bed of hydrophobic powder made two critical observations. When a droplet was placed gently onto the powder bed (to avoid fluid flow within the drop interior due to impact or rolling), almost no coverage of the droplet with powder with powder occurred.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Liquid marbles are a novel approach to producing structured fluid-filled particles for in the food, cosmetics and pharmaceutical industries [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The first suggested mechanism is that liquid marble formation is a surface energy phenomena, driven by the solid-over-liquid spreading coefficient ( SL λ ) [2,4].…”

Section: Introductionmentioning

confidence: 99%

“…The second proposed mechanism is that kinetic energy [2,3] is responsible, based on observations of the role of mixing intensity during the manufacture of a large quantity of liquid marbles..…”

Section: Introductionmentioning

confidence: 99%

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Liquid marble formation: Spreading coefficients or kinetic energy?

et al. 2009

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Abstract:A liquid marble is a network of self-assembled hydrophobic powder around a droplet. The mechanism and driving force leading to the formation of liquid marbles has not been investigated. In this study, the solid-liquid spreading coefficient ( SL λ ) is calculated and the effect of the impact kinetic energy on liquid marble formation for various fluids and particles is investigated. Single drops of fluid were produced using a syringe and released from different heights onto loosely packed powder bed. The degree of powder coverage over liquid droplet after impact was photographed and analysed using image analysis. The results show that the spreading coefficients do not predict liquid marble formation, but instead that powder coverage of the drop is proportional to the applied kinetic energy. As the kinetic energy is increased, the percentage of coverage of liquid droplet by powder increases, and as the particle size decreases the percentage of coverage also increases. These results demonstrate that good powder coverage is assisted by increasing the kinetic energy of impact, which increases the size of the initial fluid-powder contact area and causes internal fluid flow within the droplet during impact and rebound, which entrains the particles and forms the powder shell. The knowledge that the level of agitation applied is an important factor in whether A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 liquid marble are successfully produced, is expected to facilitate progress in creating liquid marbles as precursors to a wide range of structured powder-liquid products in cosmetics, pharmaceuticals and other advanced materials.

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Section: Accepted M Manuscriptmentioning

confidence: 83%

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Liquid marbles are a novel approach to producing structured fluid-filled particles for in the food, cosmetics and pharmaceutical industries [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The first suggested mechanism is that liquid marble formation is a surface energy phenomena, driven by the solid-over-liquid spreading coefficient ( SL λ ) [2,4].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations