Crystallization of potassium nitrate (KNO3) in aqueous solution Part II. Kinetical studies under the influence of additives

Kipp, S.; Lacmann, R.; Rolfs, J.

doi:10.1016/s0022-0248(96)00431-9

Cited by 10 publications

(10 citation statements)

References 21 publications

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“…The relative supersaturation is 0.8%. It is obvious that the growth rate can be reduced to zero and that the effective additive concentration depends strongly on the additive [33]. The influence is face specific, so that the change in growth form also depends on the nature of the additive.…”

Section: The Influence Of Additivesmentioning

confidence: 99%

Kinetics of Nucleation and Crystal Growth

Lacmann

Herden

Mayer³

1999

Chem. Eng. Technol.

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This paper deals with homogeneous and heterogeneous primary nucleation and the atomistic model of heterogeneous primary and secondary nucleation. Three aspects of crystal growth mechanisms will be taken into account: growth by two-dimensional nucleation, the so-called birth and spread model, spiral growth without and with consideration of the influence of diffusion, and finally adhesive growth. An equation for the estimation of the growth rate of imperfect crystals including dislocations, published by Mersmann [1], is discussed. The influence of additives on nucleation and crystal growth, respectively, will be exemplarily explained for several model systems. The effect of growth rate dispersion (GRD) is described. Therefore, some experimental results concerning growth rates and different ways to influence growth are represented and discussed. Furthermore, a model explaining the effect of GRD is represented.

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Section: The Influence Of Additivesmentioning

confidence: 99%

Kinetics of Nucleation and Crystal Growth

Lacmann

Herden

Mayer³

1999

Chem. Eng. Technol.

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“…In inorganic systems such a strategy is not generally applicable and a more empirical approach exploiting the bonding and packing in the crystal structure must be used. In this way it has proved possible to introduce crystal faces into the morphology of materials such as CaCO 3 , [3] KNO 3 [4] and K 2 SO 4 [5] that are not normally observed. In extreme cases the morphology can be so completely altered that it is comprised of a single different crystal face.…”

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confidence: 99%

Morphological control of Ca3Al2(OH)12

Fogg

Freij

Oliveira

et al. 2002

Journal of Crystal Growth

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The effect of a range of inorganic and organic crystal growth modifiers on the morphology of Ca 3 Al 2 (OH) 12 has been studied. It has been found that some additives show a strong preference for a single crystal face forming polyhedral crystals whilst others are less selective, producing crystals with a less well defined morphology. In this way sulphite and dithionite preferentially interact with the {111} face producing octahedral crystals and nitrilotriacetic acid stabilises the {110} face forming rhombic dodecahedral crystals. Phosphate, however, leads to the formation of small needle-like crystals and the organic acids, N(CH 2 CO 2 H) 2 (CH 2 PO 3 H 2), N(CH 2 CO 2 H)(CH 2 PO 3 H 2) 2 , HN(CH 2 PO 3 H 2) 2 , and H 3 CN(CH 2 PO 3 H 2) 2 , produce near spherical crystals. The ability to be able to control the morphology of a material is of great importance in a variety of fields. This control is brought about by varying the crystallising conditions, typically by the addition of a crystal growth modifier to the solution. For molecular crystals, morphological modification has been brought about by the use of stereospecific inhibition of the growth of particular crystal faces. [1,2]

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“…5. This polymorph preferentially grows in an elongated, needle-like shape with an aspect ratio L 1 /L 2 of about 4:1 [10]. Since the elongated crystals can exceed the film structure, the stable phase-II KNO 3 is not desired in protein-based films.…”

Section: Crystallizationmentioning

confidence: 99%

Protein Composite Materials by Crystallization: Product and Process Design

Frohberg

Ulrich

2015

Chem Eng & Technol

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The product and process design of protein composite materials continuously produced by reactive extrusion are studied in detail. A suitable process design and operating window are presented. Potassium nitrate (KNO 3 ) was used as a model additive and as a tool for modifying the physiochemical properties of the extruded protein films. The crystalline structures were identified and correlated to the tensile properties of the films. Uniformly distributed trigonal phase-III KNO 3 crystals were observed within the film, which led to significantly higher elongation values of the films. Appropriate downstream operations are able to prevent the undesired polymorph transition to the orthorhombic phase II of KNO 3 which would strongly reduce the mechanical performance.

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Crystallization of potassium nitrate (KNO3) in aqueous solution Part II. Kinetical studies under the influence of additives

Cited by 10 publications

References 21 publications

Kinetics of Nucleation and Crystal Growth

Kinetics of Nucleation and Crystal Growth

Morphological control of Ca3Al2(OH)12

Protein Composite Materials by Crystallization: Product and Process Design

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