Growth of calcium carbonate in polyacrylamide hydrogel: Investigation of the influence of polymer content

Helbig, Uta

doi:10.1016/j.jcrysgro.2008.02.022

Cited by 34 publications

(30 citation statements)

References 56 publications

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“…Relying on a double diffusion set-up, Helbig recently demonstrated that the morphology of crystals has a strong dependence on the polymer content of the hydrogels, in which the crystals grow. [109] A gel with acrylamide content of 10% and pore size of 30 nm can produce calcite pseudo-octahedral mesocrystals.…”

Section: Calcite Mesocrystals Formed In Hydrogelsmentioning

confidence: 99%

Mesocrystals—Ordered Nanoparticle Superstructures

2010

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Mesocrystals are 3D ordered nanoparticle superstructures, often with internal porosity, which receive much recent research interest. While more and more mesocrystal systems are found in biomineralization or synthesized, their potential as material still needs to be explored. It needs to be revealed, which new chemical and physical properties arise from the mesocrystal structure, or how they change by the ordered aggregation of nanoparticles to fully exploit the promising potential of mesocrystals. Also, the mechanisms for mesocrystal synthesis need to be explored to adapt it to a wide class of materials. The last three years have seen remarkable progress, which is summarized here. Also potential future directions of this reaserch field are discussed. This shows the importance of mesocrystals not only for the field of materials research and allows the appliction of mesocrystals in advanced materials synthesis or property improvement of existing materials. It also outlines attractive research directions in this field.

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Section: Calcite Mesocrystals Formed In Hydrogelsmentioning

confidence: 99%

Mesocrystals—Ordered Nanoparticle Superstructures

2010

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“…The decrease in pH was due to the formation of calcium phosphate. When PO 4 3-and/or HPO 4 2-were consumed by the formation of calcium phosphates such as OCP and HAp, the following reactions occurred and the pH of the gel consequently decreased…”

Section: Crystallization Of Ocp and Dcpdmentioning

confidence: 99%

“…This method is especially useful for crystal growth of poorly soluble compounds. Many sparingly soluble inorganic compounds, such as calcium carbonate [1][2][3][4], calcium phosphate [5][6][7][8][9][10][11][12], calcium tartrate [13,14], and calcium oxalate [15], have been synthesized in gels. The crystals formed in the gel can have a variety of morphologies: dominant factors affecting crystal morphology are degree of supersaturation, rate-determining step of crystal growth, and interactions between the gel molecules and crystals and/or ions.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of calcium phosphate in polyacrylamide hydrogels containing phosphate ions

Yokoi

Kawashita

Kikuta

et al. 2010

Journal of Crystal Growth

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“…Qualitative and semi quantitative composition of the dried precipitate was determined by means of FT-IR spectroscopy (FT-IR Bruker, Tensor II) using KBr pellet technique [35] and by X-ray powder diffraction (XRD) using an automatic Philips diffractometer, model PW1820 (CuKα radiation, graphite monochromator, proportional counter) in Bragg-Brentano geometry. The diffraction intensities were measured in the angular range 10 • ≤ 2Θ ≤ 70 • .…”

Section: Model Systemmentioning

confidence: 99%

“…In such systems nucleation and growth were simultaneously controlled [34]. Double-diffusion of calcium and carbonate ions into the polyacrylamide hydrogels of different polymer content has been investigated and a correlation between morphology of precipitate and hydrogel concentration was found [35]. A similar experimental setup was also applied in the agarose hydrogel system in order to estimate the impact of porosity on the properties of mineral phase and to correlate it with supersaturation profile and presence of additives [36,37].…”

Section: Introductionmentioning

confidence: 99%

Crystallization of Calcium Carbonate in Alginate and Xanthan Hydrogels

et al. 2017

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Calcium carbonate polymorphs were crystallized in alginate and xanthan hydrogels in which a degree of entanglement was altered by the polysaccharide concentration. Both hydrogels contain functional groups (COOH and OH) attached at diverse proportions on saccharide units. In all systems, the precipitation process was initiated simultaneously with gelation, by the fast mixing of the calcium and carbonate solutions, which contain the polysaccharide molecules at respective concentrations. The initial supersaturation was adjusted to be relatively high in order to ensure the conditions suitable for nucleation of all CaCO 3 polymorphs and amorphous phase(s). In the model systems (no polysaccharide), a mixture of calcite, vaterite and amorphous calcium carbonate initially precipitated, but after short time only calcite remained. In the presence of xanthan hydrogels, precipitation of either, calcite single crystals, porous polyhedral aggregates, or calcite/vaterite mixtures were observed after five days of ageing, because of different degrees of gel entanglement. At the highest xanthan concentrations applied, the vaterite content was significantly higher. In the alginate hydrogels, calcite microcrystalline aggregates, rosette-like and/or stuck-like monocrystals and vaterite/calcite mixtures precipitated as well. Time resolved crystallization experiments performed in alginate hydrogels indicated the initial formation of a mixture of calcite, vaterite and amorphous calcium carbonate, which transformed to calcite after 24 h of ageing.

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Growth of calcium carbonate in polyacrylamide hydrogel: Investigation of the influence of polymer content

Cited by 34 publications

References 56 publications

Mesocrystals—Ordered Nanoparticle Superstructures

Mesocrystals—Ordered Nanoparticle Superstructures

Crystallization of calcium phosphate in polyacrylamide hydrogels containing phosphate ions

Crystallization of Calcium Carbonate in Alginate and Xanthan Hydrogels

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