Effect of supersaturation and fluid shear on the habit and homogeneity of potassium dihydrogen phosphate crystals

Joshi, M. S.; Paul, Baby K.

doi:10.1016/0022-0248(74)90177-8

Cited by 37 publications

(10 citation statements)

References 13 publications

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“…Figures c, e, and f show that the aspect ratios of KDP crystals obtained from the S/NS emulsion is smaller than that obtained from the NS/S emulsion. It has been reported that growth rate of (011) face of KDP crystals linearly increases with the supersaturation, whereas that of (010) face increases parabolically with the supersaturation both in a static and dynamic conditions . This anisotropic nature in growth kinetics of KDP leads to a formation of crystals with aspect ratio of about 6.5 at a low supersaturation.…”

Section: Resultsmentioning

confidence: 95%

“…Aspect ratio for a given crystal was calculated as illustrated in figure . Information on indices of crystal faces is given elsewhere .…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, size and morphology of crystals were not similar to those of the droplets. Furthermore, it has been reported that growth habit of ammonium sulfate, KDP and γ‐glycine are dependent on supersaturation . Therefore, difference in relative supersaturation during the crystallization process with the S/NS and the NS/S emulsions can be qualitatively understood by aspect ratio of those crystals without direct concentration measurement which is very difficult in an emulsion system with agitation.…”

Section: Introductionmentioning

confidence: 99%

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Influence of emulsion types on nucleation kinetics and growth habit in the cooling crystallization

Kim

Koo

2014

Crystal Research and Technology

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Experiments on unseeded batch cooling crystallization were made to investigate the influence of emulsion [solution in non‐solvent (S/NS) emulsion and non‐solvent in solution (NS/S) emulsion] on crystal size and growth habit of various materials such as hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine, ammonium sulfate, potassium dihydrogen phosphate (KDP), and γ‐glycine. Size of crystals obtained from the S/NS emulsions was found to be significantly larger than that obtained from the NS/S emulsions. Those results were explained by broad induction time distribution of nucleation in the isolated solution droplets and subsequent seeding effect by free movement of early‐induced crystals by vigorous agitation. As a result, the population density of crystals was shown to be smaller in the S/NS emulsions than that in the NS/S emulsions. In the S/NS emulsions, desupersaturation rate should be slow and high supersaturation is subsequently generated during crystal growth stage. Therefore, it may be concluded that crystal morphology of the materials with supersaturation dependent growth habit, such as ammonium sulfate, KDP and γ‐glycine, can be controlled by selection of emulsion type.

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Section: Resultsmentioning

confidence: 95%

“…Aspect ratio for a given crystal was calculated as illustrated in figure . Information on indices of crystal faces is given elsewhere .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of emulsion types on nucleation kinetics and growth habit in the cooling crystallization

Kim

Koo

2014

Crystal Research and Technology

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“…It is also reported that the growth rates of KDP crystals along both Z-and XY-axes are the second-order process. The single KDP crystal growth studies were also carried out by Joshi and Paul, 11 who observed that the relatively longer and narrower crystals can be obtained at low supersaturation, whereas high supersaturation gives relatively broader crystals. Moreover, the ratio of length to width and the ratio of growth rates of pyramidal and prism faces decrease nonlinearly with increasing supersaturation level.…”

Section: Discussionmentioning

confidence: 99%

Crystal Shape Control by Manipulating Supersaturation in Batch Cooling Crystallization

Yang

Kubota

Zhou

et al. 2006

Crystal Growth & Design

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This paper describes a study on the shape control of potassium dihydrogen phosphate (KDP) in batch cooling suspension crystallization by selecting the supersaturation as a media control variable. The effects of different cooling modes on the supersaturation level and hence on the crystal shape were investigated. The results clearly show that different shapes of crystals were obtained at the various supersaturation courses. When a specific shape of crystal is desired from suspension batch cooling crystallization, a suitable cooling mode should be selected and furthermore the optimal one can be found.

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“…Very small crystals may often be born in a near-perfect state virtually free from defects (Strickland-Constable, 1972). Indeed dislocation densities measured on somewhat larger solution-grown crystals are typically in the range 104-106 cm-2 (Treivus et al, 1965;Belyaev et al, 1965; Joshi and Paul 1974).…”

Section: Size-dependent Growth Mechanismsmentioning

confidence: 99%

On Size-Dependent Crystal Growth

Garside¹,

Phillips²,

Shah³

1976

Ind. Eng. Chem. Fund.

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On Size-Dependent Crystal Growth Observed size-dependent crystal growth rates have previously been explained in terms of either the influence of bulk diffusion to the crystal surface or the Gibbs-Thomson effect. In this communication we show that these effects are unlikely to be important over the size range 1-100 pm. A more likely cause, size-dependent surface integration kinetics, is suggested and evidence to support this view is presented.

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Effect of supersaturation and fluid shear on the habit and homogeneity of potassium dihydrogen phosphate crystals

Cited by 37 publications

References 13 publications

Influence of emulsion types on nucleation kinetics and growth habit in the cooling crystallization

Influence of emulsion types on nucleation kinetics and growth habit in the cooling crystallization

Crystal Shape Control by Manipulating Supersaturation in Batch Cooling Crystallization

On Size-Dependent Crystal Growth

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