Additive controlled crystallization

Song, Ruiqi; Cölfen, Helmut

doi:10.1039/c0ce00419g

Cited by 209 publications

(190 citation statements)

References 220 publications

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“…In both cases the crystal growth is affected and the crystal habit is modified. [121][122] It should be mentioned here that the solvent molecules act similarily to additives to some extent, and therefore, crystallization in different solvents or solvent mixtures normally leads to the precipitation of crystals with different growth morphologies. [123][124][125][126][127][128][129][130] Polymers often serve as additives for controled crystallization.…”

Section: Chiral Resolution By Crystallization In the Presence Of Solumentioning

confidence: 99%

Biomimetic Polymers for Chiral Resolution and Antifreeze Applications

Medina¹,

Mastai²

2011

On Biomimetics

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Section: Chiral Resolution By Crystallization In the Presence Of Solumentioning

confidence: 99%

Biomimetic Polymers for Chiral Resolution and Antifreeze Applications

Medina¹,

Mastai²

2011

On Biomimetics

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“…The sealing mats supporting the precipitated crystals were cut into sections with 6x8 studs, as per SEM, and these were then mounted onto glass microscope slides using double sided carbon sticky tabs. Raman spectra were obtained from single crystals (rather than polycrystals) in the range 1050 to 1150 cm 1 are seen across Asp, Gly and Asn, but are most marked with Asp ( Figure 6b). This is consistent with occlusion being promoted both at higher [Asp] and higher supersaturations, where the latter correlates with an increase in the density of step edges and kink sites, 49 which translates into higher occlusion levels.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

“…This effect was initially investigated by precipitating calcite crystals in the presence of Asp, recording their Raman spectra and then determining the amounts of Asp occluded within the crystals. A lattice mode peak (at  283 cm 1 ) and the strongest  1 peak (at  1085 cm 1 ) were selected for analysis. 48 The calcite/Asp crystals showed rapid changes in the peak shift with the amount Asp occluded up to 1 mol%, before reaching a plateau, where this effect was greater for the lattice mode peak (4 cm 1 ) than the 1 vibration peak (1.5 cm 1 ) ( Figure S9).…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

“…8,9 Inspired by biomineralization processes, a wide range of organic additives, including biomacromolecules, block copolymers and small organic species, have been explored to control the precipitation of inorganic crystals. 1 These additives can also become incorporated within the crystal lattice, 10 14 where this is recognized not only for the introduction of impurities into crystals, 15 17 but has also been used to enhance the mechanical properties of calcite, 13,18 to change the bandgap of ZnO, 19 and to endow the host crystal with new properties, such as color, fluorescence or magnetism. 20 23 Understanding the mechanisms of additive occlusion, and the structure/ property relationships of the product doped crystals, however, relies upon the ability to quantify the amount of additives occluded under different growth conditions.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Screening of Calcium Carbonate Precipitation in the Presence of Amino Acids: Kinetics, Structure, and Composition

Green

Ihli

Kim

et al. 2016

Crystal Growth & Design

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Soluble additives are widely used to control crystallization, leading to definition of properties including size, morphology, polymorph and composition. However, due to the number of potential variables in these experiments, it is typically extremely difficult to identify reaction conditions -as defined by solution compositions, temperatures and combinations of additives -that give the desired product. This article introduces a high throughput methodology which addresses this challenge and enables the streamlined preparation and characterization of crystalline materials. Using calcium carbonate precipitated in the presence of selected amino acids as a model system, we use well plates as micro volume crystallizers, and an accurate liquid handling pipetting workstation for sample preparation. Following changes in the solution turbidity using a plate reader delivers information about the reaction kinetics, while semi automated scanning electron microscopy, powder XRD and Raman microscopy provide structural information about the library of crystalline products. Of particular interest for the CaCO3 system is the development of fluorescence based protocols which rapidly evaluate the amounts of the additives occluded within the crystals. Together, these methods provide a strategy for efficiently screening a broad reaction space, where this can both accelerate the ability to generate crystalline materials with target properties, and develop our understanding of additive directed crystallization.

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“…1,2 Soluble additives can be particularly effective in defining crystal sizes, morphologies and polymorphs, 3 delivering for example, crystalline particles with complex hierarchical structures. [4][5][6][7][8] The encapsulation of additives within the crystal lattice can also change the textures, 9 mechanical properties, [10][11][12] and optical properties 13,14 of crystals.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoscale Confinement on the Crystallization of Potassium Ferrocyanide

Anduix‐Canto

Kim

Wang

et al. 2016

Crystal Growth & Design

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Many crystallization processes of great significance in nature and technology occur in small volumes rather than in bulk solution. This article describes an investigation into the effects of nanoscale confinement on the crystallization of the inorganic compound potassium ferrocyanide, K4Fe(CN)6 (KFC). Selected for study due to its high solubility, rich polymorphism and interesting physical properties, K4Fe(CN)6 was precipitated within controlled pore glasses (CPG) with pore diameters of 8, 48 and 362 nm. Remarkable effects were seen, such that although anhydrous potassium ferrocyanide was never observed on precipitation in bulk aqueous solution, it was the first phase to crystallize within the CPGs and was present for at least 1 day in all three pore sizes. Slow transformation to the metastable tetragonal polymorph of the trihydrate K4Fe(CN)6•3H2O (KFCT) then occurred, where this polymorph was stable for a month in 8 nm pores. Finally, conversion to the thermodynamically stable monoclinic polymorph of KFCT was observed, where this phase always found after a few minutes in bulk solution. As far as we are aware these retardation effects -by up to five orders of magnitude in the 8 nm pores -are far greater than any seen previously in inorganic systems, and provide strong evidence for the universal effects of confinement on crystallization.

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Additive controlled crystallization

Cited by 209 publications

References 220 publications

Biomimetic Polymers for Chiral Resolution and Antifreeze Applications

Biomimetic Polymers for Chiral Resolution and Antifreeze Applications

Rapid Screening of Calcium Carbonate Precipitation in the Presence of Amino Acids: Kinetics, Structure, and Composition

Effect of Nanoscale Confinement on the Crystallization of Potassium Ferrocyanide

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