The effect of dyes on the crystal habits of some oxy-salts

Butchart, A.; Whetstone, J.

doi:10.1039/df9490500254

Cited by 16 publications

(5 citation statements)

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“…Initially motivated to control the habit of NH 4 NO 3 for use in explosives, 189 Whetstone tested 120 dyes as habit modifying agents. 190 Acid fuchsin was especially effective. 191 In the course of his habit modification work, he discovered several (NH 4 ) 2 SO 4 , NaNO 3 , and KNO 3 DICs.…”

Section: Whetstonementioning

confidence: 97%

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Dyeing Crystals

2001

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Section: Whetstonementioning

confidence: 97%

“…Whetstone, a researcher at the Nobel Explosives Division of the Imperial Chemical Industries (ICI), took an interest in Buckley's work in the 1950s. Initially motivated to control the habit of NH 4 NO 3 for use in explosives, Whetstone tested 120 dyes as habit modifying agents . Acid fuchsin was especially effective .…”

Section: Whetstonementioning

confidence: 99%

Dyeing Crystals

2001

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“…The ability of additives to interfere with the crystallization process has been well studied with respect to both inorganic − and organic − systems, as well as utilizing computational modeling methodologies to try and understand their effect at a molecular level. − Studies on the influence of additives on the crystallization process have focused heavily on tailor-made additives (TMAs), which refer to compounds added to a crystallization system that act as imposter molecules, having only slight differing moieties than the solute to be crystallized, and as such, a similar molecular structure to the target solute . TMA research has concentrated on their effect on crystal growth; ,,− however, their effect on the nucleation process has been an area of growing focus.…”

Section: Introductionmentioning

confidence: 99%

Understanding and Designing Tailor-Made Additives for Controlling Nucleation: Case Study of p-Aminobenzoic Acid Crystallizing from Ethanolic Solutions

Kaskiewicz

Rosbottom

Hammond

et al. 2021

Crystal Growth & Design

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A workflow for tailor-made additive screening and crystallisation control using a combination of molecular modelling and experimental techniques is presented. The impact of seven structurally analogous additives, the majority of which containing a carboxylic acid group, on the nucleation of alpha-para-aminobenzoic acid is assessed. Intermolecular grid-search modelling is used to determine dimer interaction energies. Of these, three tailor-made additives are found to form stronger carboxylic group dimer interactions with the compound. Solvation energy calculations demonstrate the stability of these dimers in solution. Subsequent intermolecular interaction assessment demonstrates an ability of one of the tailor-made additives to interfere with the molecular preassembly route to nucleation, with molecular charge distributions providing an insight into this effect. Polythermal crystallisation experimental screening confirms the effectiveness of these tailor-made additives to inhibit nucleation. Interestingly, the nucleation mechanism is found to change from instantaneous to progressive nucleation in the absence and presence of the tailor-made additives in solution, respectively, together with an increase in the effective interfacial tension.It includes: pABA crystallisation background science, grid optimization, intermolecular interaction energies and contributions, dimer interaction geometries, dimer solvation and pABA interaction energies, TMAs within pABA crystal structure, statistical T-test, TMA screen MSZWs, pABA optical micrographs, crystallisation and dissolution temperatures, crystallisability and van't Hoff analysis and nucleation kinetic analysis.

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“…W ith crystals that are large enough to be stable because of low surface free energies, adsorbed impurities are thought to inhibit or slow growth by interfering with the propagation of steps across the face of the crystal. In many cases, adsorption of impurities also causes a change in the type of crystal growth, or habit, observed when the supersaturation point is exceeded (Butchard & Whetstone 1949). The inhibition of the freezing of water, or the inhibition of the growth of ice crystals in the presence of the antifreezes at temperatures below the equilibrium freezing point, appears to be an example of this adsorption-inhibition phenomenon.…”

Section: Adsorption Inhibition Of Crystallizationmentioning

confidence: 99%

Role of glycopeptides and pepddes in inhibition of crystallization of water in polar fishes

Vries

Price²

1984

Phil. Trans. R. Soc. Lond. B

117

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In the ice-laden polar oceans, water temperatures of — 2 °C are common. This temperature is 1.1 °C below the equilibrium freezing point ( — 0.9 °C) of the fishes’ body fluids. Avoidance of freezing in these environments has been linked to the presence of unusual blood peptides and glycopeptides. These molecules have molecular masses ranging from 2.5 to 20 kDa and are viewed as having antifreeze properties because they lower the freezing point of water by a non-colligative process. A 2% solution of antifreeze has a freezing point of — 1.2 °C and ice formed in their presence melts at — 0.02 °C. Measurements of antifreeze concentrations in ice indicate that these molecules, unlike other proteins of similar size and conformation, are incorporated into the solid phase during freezing and adsorb to it. Adsorption of the antifreezes to ice appears to inhibit growth along the preferred axes ( a -axes) by raising the curvature of the growth steps on the basal plane. At temperatures below — 1.2 °C, crystal growth occurs in the form of long spicules whose axes are parallel to the c -axis, the non-preferred axis of growth.

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The effect of dyes on the crystal habits of some oxy-salts

Cited by 16 publications

References 0 publications

Dyeing Crystals

Dyeing Crystals

Understanding and Designing Tailor-Made Additives for Controlling Nucleation: Case Study of p-Aminobenzoic Acid Crystallizing from Ethanolic Solutions

Role of glycopeptides and pepddes in inhibition of crystallization of water in polar fishes

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