A Study of the Effect of Sulfate Ions on the Growth of Sodium Chlorate Crystals

Bliznakov, G.; Kirkova, E.

doi:10.1002/crat.19690040303

Cited by 28 publications

(16 citation statements)

References 4 publications

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“…As pointed out by Davey and co-workers, 4 a promoting effect 24,25 of additives on crystal growth was observed at rather low concentrations of the additives, and it was explained on the basis of the edge free energy reduction. 24 The promoting effect has also been attributed to the formation of additive−solute complexes 25 in solution. In either of the scenarios, the promoting effect always diminishes with increase of additive concentration.…”

Section: In Solutionmentioning

confidence: 89%

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Han

Tan

2012

Crystal Growth & Design

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The effects of various anions and cations dissociated from a spectrum of inorganic salts on the growth of DL-alanine polar c-axis have been systematically investigated using in situ microscopic observations on single seed crystals. Surprisingly, it is observed that both the polar −c and +c ends of DLalanine c-axis undergo a revival of solvent-poisoned dead growth in the presence of every one of the additives used in this study. Furthermore, it is found that divalent ions (e.g., Mg 2+ and SO 4 2− ) promote the growth along DL-alanine c-axis more effectively than univalent ions (e.g., Na + and Cl − ). Such an ion-induced growth acceleration of DL-alanine c-axis, contrary to the usual understanding, particularly shows an unusual case where important Coulombic interaction between additive and crystal surface can actually favor face growth. This interesting phenomenon is interpreted at the molecular level, with the role of surface roughening particularly highlighted.

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Section: In Solutionmentioning

confidence: 89%

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Han

Tan

2012

Crystal Growth & Design

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“…HEDP and SHMP modified the re-growth morphology, leading to spicular growth domain. There are models that describe the effects of impurities on crystal growth processes based on the concept of adsorption of impurities at kinks, ledges and terraces of the growing crystal (17)(18)(19). These models have been surveyed recently and the experimental data on crystal growth rates are compared with their predictions (2).…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic analysis of pure and impurity doped pentaerythritol tetranitrate crystals grown at room temperature

Pitchimani

Zheng

Simon

et al. 2007

J Therm Anal Calorim

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Pentaerythritol tetranitrate (PETN) powders are used to initiate other explosives. During longterm storage, changes in powder properties can cause changes in the initiation performance. Changes in the morphology and surface area of aging powders are observed due to sublimation and growth of PETN crystals through coarsening mechanisms, (e.g. Ostwald ripening, sintering, etc.). In order to alleviate the sublimation of PETN crystals under service conditions, stabilization methods such as thermal cycling and doping with certain impurities during or after the crystallization of PETN have been proposed.In this report we present our work on the effect of impurities on the morphology and activation energy of the PETN crystals. The pure and impurity doped crystals of PETN were grown from supersaturated acetone solution by solvent evaporation technique at room temperature. The difference in the morphology of the impurity-doped PETN crystal compared to pure crystal was examined by optical microscopy. The changes in the activation energies and the evaporation rates are determined by thermogravimetric (TGA) analyses. Our activation energies of evaporation agree with earlier reported enthalpies of vaporization. The morphology and activation energy of PETN crystals doped with Ca, Na, and Fe cations are similar to that for pure PETN crystal, whereas the Zn-ion-doped PETN crystals have different morphology and decreased activation energy.

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“…In contradiction to Bliznarkov and Kirkova [41], who predict that impurity molecules can be centers for nucleation, resulting in an increasing crystal growth rate, the other theories usually predict decreasing growth rates under the influence of special impurities. Bliznakow [42] explains this effect as a consequence of blocked kink positions, because the crystal growth rate is dominantly determined by the number of free kink positions.…”

Section: Theory Of Crystal Growth Under the Influence Of Additivesmentioning

confidence: 87%

Tailor‐made additives to influence the habit of barite (BaSO₄) obtained by precipitation

Kipp¹,

Lacmann²,

Reichelt³

et al. 1996

Chem Eng & Technol

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In order to influence the habit of barite (BaS04) single crystals obtained by precipitation, the tailor-made additives 2-aminoethanol, 3-aminopropanol, 5-aminopentanol, 4-aminobutane sulfonic acid, and several other growth inhibitors have been tested. The crystallization experiments have been carried out in a fully automated crystallizer with reproducible educt feed rates. The kinetics of the reaction has been measured by means of the conductivity. Scanning electron microscopic analysis of the obtained crystal habits led to the result that most of the additives tested did not influence the growth form of the crystals, but the predicted, tailor-made additives resulted in a more isometric crystal form.

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A Study of the Effect of Sulfate Ions on the Growth of Sodium Chlorate Crystals

Cited by 28 publications

References 4 publications

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Thermodynamic analysis of pure and impurity doped pentaerythritol tetranitrate crystals grown at room temperature

Tailor‐made additives to influence the habit of barite (BaSO₄) obtained by precipitation

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A Study of the Effect of Sulfate Ions on the Growth of Sodium Chlorate Crystals

Cited by 28 publications

References 4 publications

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Strong Additive–Surface Interaction Leads to the Unusual Revival of Growth at Solvent-Poisoned Faces ofdl-Alanine Crystal

Thermodynamic analysis of pure and impurity doped pentaerythritol tetranitrate crystals grown at room temperature

Tailor‐made additives to influence the habit of barite (BaSO4) obtained by precipitation

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Product

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Tailor‐made additives to influence the habit of barite (BaSO₄) obtained by precipitation