Controlling crystal growth with modifiers

Jones, Franca; Ogden, Mark I.

doi:10.1039/b918849e

Cited by 91 publications

(74 citation statements)

References 47 publications

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“…The growth of barium sulfate is sensitive to the supersaturation and this results in morphological changes as S varies [28,29]. The morphology was investigated both at 25 and 75 1C (the increase in temperature of the precipitation increases the effect of kinetics due to the Arrhenius relationship of the rate constant while the thermodynamics, DG, change less significantly with temperature [23]).…”

Section: Resultsmentioning

confidence: 99%

Rod-shaped barium sulfate particles from a completely inorganic system

Radomirovic

Ogden

Jones

2011

Journal of Crystal Growth

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a b s t r a c tRod-shaped barium sulfate particles can be formed from purely inorganic systems at 75 1C and these particles are single crystals elongated in the c-axis. This c-axis growth promotion relative to the other crystal faces is absent when the cation impurities are absent suggesting a specific interaction of the cations with the growing crystal. Attempts have been made to determine the cause of this c-axis growth promotion, but no one mechanism appears to adequately explain this effect and it may be due to a combination of different impacts. The same cations do not induce rod-shaped particles at 25 1C, thus suggesting an important role of kinetics in the crystallization of these particles. Finally, previous reports suggesting that the formation of rod-like particles is due to the presence of an organic additive may be incorrect as sufficient sodium ions may have been present to give these particles even in their absence.

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Section: Resultsmentioning

confidence: 99%

Rod-shaped barium sulfate particles from a completely inorganic system

Radomirovic

Ogden

Jones

2011

Journal of Crystal Growth

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“…Possible mechanisms of modifiers which may help to reduce the damage are: (i) keeping salts dissolved in solution (inhibitors) allowing for transport to the surface during evaporation; (ii) promoting the crystallization of a specific crystal phase (promoters) at or near saturation; (iii) changing the shape of the growing crystals (habit modifiers). 30 Beneficial effects of habit modification can for instance be seen in the case of ferrocyanide modification of sodium chloride. Due to the presence of ferrocyanide, the shape of the crystals changes from cubic to dendritic.…”

Section: Introductionmentioning

confidence: 99%

Effect of borax on the wetting properties and crystallization behavior of sodium sulfate

et al. 2017

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Borax has been identified as possible crystallization modifier for sodium sulfate. Understanding the effect of borax on factors influencing transport and crystallization kinetics of sodium sulfate helps to clarify how this modifier might limit crystallization damage. It has been observed that the addition of borax to sodium sulfate solutions has no influence on the wetting properties (contact angle on glass, surface tension,or evaporation rate) and therefore will not influence solution transport. Additionally, the influence of borax on the crystallization kinetics of sodium sulfate was studied under controlled environmental conditions. This was done in mixtures in glass micro capillaries, and sequentially in droplets on glass plates. Under the here studied precipitation conditions, the addition of borax has no influence on the supersaturation ratio at the onset of crystallization, but it significantly affects the crystallization pattern of anhydrous sodium sulfate crystals (thenardite). Using RAMAN spectroscopy, two different hydrates of borax were identified after precipitation depending on the initial concentration of the solution. Each hydrate has a different effect on the subsequent crystallization of sodium sulfate. The decahydrate polymorph of borax leads to the precipitation of hydrated sodium sulfate crystals (mirabilite) and the pentahydrate form favors the precipitation of the anhydrous sodium sulfate crystals (thenardite) with an altered crystal habit. Using X-ray diffraction, overdevelopment of the (111), (131), (222) and (153) faces of thenardite was identified. Additionally, the ratios between several peaks is reversed. These results confirm the deviation of the grown crystals of the equilibrium crystal shape of thenardite as observed with optical microscopy.

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“…In the present study, no fungus was found during two months storage at both the conditions. Jones (1987) reported the detrimental influence of mould growth in stored feeds reduced nutritional value owing to the loss of dietary lipids, amino acids (especially lysine and arginine) and vitamins by enzymatic digestion. The value of the initial moisture content in Mega, Quality and Saudi Bangla fish feed were 11.34%, 11.84% and 11.96%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Storage Time on Fish Feed Stored at Room Temperature and Low Temperature

et al. 2013

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An experiment was conducted to determine the changes of nutritive value of different commercial fish feeds stored at room temperature (25-30°C) and low temperature (5-8°C) for a period of two months by taking biweekly sample. Three most popular fish feeds named Mega fish feed, Quality fish feed and Saudi Bangla fish feed used in the Mymensingh region were selected for the purpose. Throughout the study, physical characteristics and proximate composition of three commercial fish feeds were analyzed. There were no change in color, appearance of moderately bad odour, a little bit of soft texture and broken pellets were found in later stages of the experiment but the overall quality was still acceptable. Along with physical characteristics, changes were occurred in case of proximate composition. In Mega, Quality and Saudi Bangla fish feed, crude protein content was reduced in both the storage conditions. Lipid content also exhibited similar reduction due to storage at both the conditions. Whereas moisture content increased a little bit in the case of room temperature storage and decreased when stored in low temperature (5-8°C). No marked changes had been occurred in other proximate composition like ash, and crude fibre. Declining rate of the quality of fish feeds was higher at room temperature (25-30°C) than low temperature (5-8°C) but the overall quality remained acceptable upto two months storage at both the conditions. It is suggested to use the feed within two months after manufacture.

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Controlling crystal growth with modifiers

Cited by 91 publications

References 47 publications

Rod-shaped barium sulfate particles from a completely inorganic system

Rod-shaped barium sulfate particles from a completely inorganic system

Effect of borax on the wetting properties and crystallization behavior of sodium sulfate

Effect of Storage Time on Fish Feed Stored at Room Temperature and Low Temperature

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