Controlled crystallization of hierarchical and porous calcium carbonate crystals using polypeptide type block copolymer as crystal growth modifier in a mixed solution

CrystEngComm ◽  
2011 ◽  
Vol 13 (6) ◽  
pp. 2054 ◽  
Author(s):  
Xiaohui Guo ◽  
Lei Liu ◽  
Wanv Wang ◽  
Ji Zhang ◽  
Yaoyu Wang ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Calcium Carbonate ◽  
Block Copolymer ◽  
Mixed Solution ◽  
Controlled Crystallization ◽  
Porous Calcium Carbonate ◽  
Growth Modifier

Thermosensitive polymer controlled morphogenesis and phase discrimination of calcium carbonate

2017 ◽  
Vol 53 (48) ◽  
pp. 6464-6467 ◽  
Author(s):  
Jun Jiang ◽  
Klaus Tauer ◽  
Yun-Hao Qiu ◽  
Ya-Xu Zhong ◽  
Min-Rui Gao ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Calcium Carbonate ◽  
Ethylene Glycol ◽  
Surface Structures ◽  
Poly Ethylene Glycol ◽  
Thermosensitive Polymer ◽  
Phase Discrimination ◽  
Isopropyl Acrylamide ◽  
Poly Ethylene ◽  
Growth Modifier

Homogeneous aragonite flowers with controlled surface structures can be synthesized by using a thermosensitive polymer, i.e. poly(ethylene glycol)–poly(N-isopropyl acrylamide)–poly(acrylamido methyl propane sulfonate) (PEG–PNIPAM–PAMPS), as a crystal growth modifier in the mineralization of calcium carbonate.

Controlled crystallization of vaterite from viscous solutions of organic colloids

1990 ◽  
Vol 5 (12) ◽  
pp. 2928-2932 ◽  
Author(s):  
Ladislav Pach ◽  
Zdenek Hrabe ◽  
Sridhar Komarneni ◽  
Rustum Roy
Keyword(s):  
Crystal Growth ◽  
Calcium Carbonate ◽  
Aqueous Solutions ◽  
Experimental Arrangement ◽  
Hydroxyethyl Cellulose ◽  
Shaped Body ◽  
Controlled Crystallization ◽  
Viscous Solutions

Precipitation of calcium carbonate from hydroxyethyl cellulose (HEC) containing aqueous solutions of CaCl2 and Na2CO3 resulted in an uncommon polymorph, vaterite. In contrast to precipitations without HEC, crystallization in the presence of HEC led to a shell-shaped body consisting of organized vaterite platelets. The artificial shell is a composite of stacks of vaterite and about 2% HEC. In the experimental arrangement used, HEC controlled both nucleation and crystal growth of vaterite. Concentration of HEC also affected the platelet's thickness which in turn influenced the shell's morphology as well. These results demonstrate the importance of organic-inorganic interface in controlling crystallization.

Crystal growth of calcium carbonate. A controlled composition kinetic study

1982 ◽  
Vol 86 (1) ◽  
pp. 103-107 ◽  
Author(s):  
T. F. Kazmierczak ◽  
M. B. Tomson ◽  
G. H. Nancollas
Keyword(s):  
Crystal Growth ◽  
Calcium Carbonate ◽  
Kinetic Study

Functional analyses of chitinolytic enzymes in the formation of calcite prisms inPinctada fucata

2019 ◽  
Author(s):  
Hiroyuki Kintsu ◽  
Alberto Pérez-Huerta ◽  
Shigeru Ohtsuka ◽  
Taiga Okumura ◽  
Shinsuke Ifuku ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Crystal Growth ◽  
Calcium Carbonate ◽  
Small Angle ◽  
Organic Matrix ◽  
Pinctada Fucata ◽  
Prismatic Layer ◽  
Chitinolytic Enzymes ◽  
Organic Matrices

Abstract Background: The mollusk shells present distinctive microstructures that are formed by small amounts of organic matrices controlling the crystal growth of calcium carbonate. These microstructures show superior mechanical properties such as strength or flexibility. The shell of Pinctada fucata has the prismatic layer consisting of prisms of single calcite crystals. These crystals contain small-angle grain boundaries caused by a dense intracrystalline organic matrix network to improve mechanical strength. Previously, we identified chitin and chitinolytic enzymes as components of this intracrystalline organic matrix. In this study, we analyzed the function of those organic matrices in calcium carbonate crystallization by in vitro and in vivo experiments.Results: We analyzed calcites synthesized in chitin gel with or without chitinolytic enzymes by using transmission electron microscope (TEM) and atom probe tomography (APT). TEM observations showed that grain boundary was more induced as concentration of chitinolytic enzymes increased and thus, chitin became thinner. In an optimal concentration of chitinolytic enzymes, small-angle grain boundaries were observed. APT analysis showed that ion clusters derived from chitin were detected. In order to clarify the importance of chitinolytic enzymes on the formation of the prismatic layer in vivo , we performed the experiment in which chitinase inhibitor was injected into a living Pinctada fucata and then analyzed the change of mechanical properties of the prismatic layer. The hardness and elastic modulus increased after injection of chitinase inhibitor. Electron back scattered diffraction (EBSD) mapping data showed that the spread of crystal orientations in whole single crystal also increased by the effect of inhibitor injections.Conclusion: Our results suggested that chitinolytic enzymes may function cooperatively with chitin to regulate the crystal growth and mechanical properties of the prismatic layer, and chitinolytic enzymes are essential for the formation of the normal prismatic layer of P. fucata.

Adsorption of anionic and cationic polymers on porous and non-porous calcium carbonate surfaces

1994 ◽  
Vol 75 (1-4) ◽  
pp. 197-203 ◽  
Author(s):  
Robert B. Bjorklund ◽  
Hans Arwin ◽  
Lars Järnström
Keyword(s):  
Calcium Carbonate ◽  
Cationic Polymers ◽  
Porous Calcium Carbonate
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