Structure transition from aragonite to vaterite and calcite by the assistance of SDBS

Nan, Zhaodong; Chen, Xiangna; Yang, Qianqian; Wang, Xiuzhen; Shi, Zhuqun; Hou, Wanguo

doi:10.1016/j.jcis.2008.05.045

Cited by 88 publications

(54 citation statements)

References 17 publications

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“…A similar phase transition in CaCO 3 microspheres has recently been reported [24]. The crystalline phase of CaCO 3 readily changes from metastable vaterite to stable calcite in solution [26,27]. These results suggest that the dissolution of the CaCO 3 core is involved in determining the release rate of insulin from the microspheres.…”

Section: Resultssupporting

confidence: 80%

Release of Insulin from Calcium Carbonate Microspheres with and without Layer-by-Layer Thin Coatings

2014

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Abstract:The release of insulin from insulin-containing CaCO 3 microspheres was investigated. The microspheres were prepared by mixing aqueous solutions of CaCl 2 and Na 2 CO 3 in the presence of insulin. The surface of the insulin-containing CaCO 3 microspheres was coated with a layer-by-layer thin film consisting of poly(allylamine hydrochloride) and poly(styrene sulfonate) to regulate the release kinetics of insulin. The release rate of insulin from the coated CaCO 3 microspheres was significantly suppressed compared with that of uncoated CaCO 3 microspheres, and depended on the thickness of the films. Rhombohedral calcite crystals of CaCO 3 formed from the microspheres during the release of insulin, suggesting that the CaCO 3 microspheres dissolved and recrystallized during the release of insulin.

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Section: Resultssupporting

confidence: 80%

Release of Insulin from Calcium Carbonate Microspheres with and without Layer-by-Layer Thin Coatings

2014

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“…During the preparation process, these structure directing agents may play the role of a template and a surfactant. A careful selection of the structure directing agent is necessary as their ability to selectively adsorb onto a preferred surface allows many factors such as the polymorphic phase, the nucleation, alignment of crystallites, and also the morphology to be stringently controlled [31][32][33]. Similar hierarchical microstructures have been described for biogenic calcite, where organic macromolecules and inorganic mineral form a hybrid structure over many length scales [34,35].…”

Section: Introductionmentioning

confidence: 88%

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

2017

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Abstract:A microstructural investigation by electron microscopy on a travertine specimen collected from Munigou National Park, Sichuan Province, China revealed evidence of a non-classical reversed crystal growth route previously only discovered in synthetic materials. Examination of the travertine specimen suggests that the presence of organic matter initiates the oriented aggregation of calcite nanocrystallites. Surface re-crystallisation of the aggregates leads to a single crystalline rhombohedral shell with a polycrystalline core. This core-shell structure carries a strong resemblance to synthetic calcite prepared in the presence of chitosan, where the growth of calcite was found to follow the so-called reversed crystal growth process. It is proposed that the similar roles of biomolecules in naturally occurring travertine and chitosan in the synthetic system are based on their isoelectric points and the polymerizable property of long chain chemical structures. This study is important so that the structural similarities between naturally occurring biominerals and biomimetic materials can be further understood.

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“…31 Glycine is used as an additive to induce the crystallization of vaterite, because it is a less stable crystalline phase, the addition of chemical molecules is necessary for the synthesis of vaterite. Vaterite can be stabilized with various compounds, among them glycine (cited above), 31 proteins, anionic surfactant (sodium dodecyl benzene sulfonate (SDBS) 32 and poly (4-sodium styrene sulfonate) (PSS). 24 In the double-jet method or CDJP (controlled double-jet precipitation) the cation and anion solutions are added simultaneously through separate lines to a stirred solution of a lyophilic polymer.…”

Section: Methods For Caco 3 Particles' Synthesismentioning

confidence: 99%

Precipitated Calcium Carbonate Nano-Microparticles: Applications in Drug Delivery

Costa¹,

Olyveira²,

Salomão³

2017

ATROA

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Calcium carbonate (CaCO3) precipitated particles present huge applications in drug delivery systems because their characteristics (such as size distribution, crystalline phase and specific surface area) can be precisely tailored during the synthesis. Besides this, most of the processing methods present competitive costs and produce highly biocompatible materials. This work reviewed briefly some of the many chemical and biological synthesis methods for CaCO3 nano-microparticles as well as their combination with different macromolecules (active principles, polyelectrolytes and DNA)..

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Structure transition from aragonite to vaterite and calcite by the assistance of SDBS

Cited by 88 publications

References 17 publications

Release of Insulin from Calcium Carbonate Microspheres with and without Layer-by-Layer Thin Coatings

Release of Insulin from Calcium Carbonate Microspheres with and without Layer-by-Layer Thin Coatings

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

Precipitated Calcium Carbonate Nano-Microparticles: Applications in Drug Delivery

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