The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Yuri Lvov - One of the best experts on this subject based on the ideXlab platform.
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composite phospholipid Calcium Carbonate microparticles influence of anionic phospholipids on the crystallization of Calcium Carbonate
Journal of Physical Chemistry B, 2006Co-Authors: Krishna Gopal, Zonghuan Lu, Melgardt M De Villiers, Yuri LvovAbstract:The synthesis and characterization of Calcium Carbonate microparticles by reaction of Calcium chloride and ammonium biCarbonate in the presence of negatively charged phospholipid mixtures of negative and zwitterionic phospholipids has been reported. Negatively charged phospholipids influence the crystal morphology of Calcium Carbonate and induce the formation of thermodynamically less stable veterite polymorph as opposed to calcite polymorph. The phospholipids are entrapped in the Calcium Carbonate microparticles during the crystallization process, with a uniform distribution of phospholipids in the interior of the microparticles. This phenomenon was exploited to encapsulate a model hydrophobic fluorophore, the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride complex, to simulate encapsulation of hydrophobic drug molecules. Thermogravimetric analysis reveals that, in these microparticles, the Calcium Carbonate and the phospholipid exhibit strong interactions.
Chen Jian-feng - One of the best experts on this subject based on the ideXlab platform.
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Progress in synthesis of Calcium Carbonate whiskers
Modern Chemical Industry, 2004Co-Authors: Chen Jian-fengAbstract:The synthetic technologies of Calcium Carbonate whiskers are reviewed,most of which are carried out in the nor- mal gravity environment by adding some kind of morphology-control additive or needle-like crystal seeds of Calcium Carbonate supplemented with certain phosphate so as to prompt the crystal of Calcium Carbonate whiskers to grow in a certain direction to the reaction system.In contrast to ones in the normal gravity environment,high-gravity reactive precipitation implemented in high-gravity environment has shown some outstanding advantages,including the whiskers' mean shaft diameter of 80-250 nm,no need of the needle-like crystal seeds and a declination of the optimal reaction temperature by 20℃,synthesizing the same moles of Calcium Carbonate whiskers the time and the amount of additives required are 1/18 and 1/20～3/20 of that needed by other technologies respectively.
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Study on surface properties of modified nanometer Calcium Carbonate
Modern Chemical Industry, 2001Co-Authors: Chen Jian-fengAbstract:The surface of nanometer Calcium Carbonate powder was modified with resin and stearic acid.IR analysis showed that coated agent had attached to Calcium Carbonate surface by ionic bond.The TEM photographs showed that the modified Calcium Carbonate had better disperse ability in cyclohexane.Measurement of sediment volume and contact angle of modified Calcium Carbonate indicates that the wetability in nonpolar media had been improved.
Krishna Gopal - One of the best experts on this subject based on the ideXlab platform.
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composite phospholipid Calcium Carbonate microparticles influence of anionic phospholipids on the crystallization of Calcium Carbonate
Journal of Physical Chemistry B, 2006Co-Authors: Krishna Gopal, Zonghuan Lu, Melgardt M De Villiers, Yuri LvovAbstract:The synthesis and characterization of Calcium Carbonate microparticles by reaction of Calcium chloride and ammonium biCarbonate in the presence of negatively charged phospholipid mixtures of negative and zwitterionic phospholipids has been reported. Negatively charged phospholipids influence the crystal morphology of Calcium Carbonate and induce the formation of thermodynamically less stable veterite polymorph as opposed to calcite polymorph. The phospholipids are entrapped in the Calcium Carbonate microparticles during the crystallization process, with a uniform distribution of phospholipids in the interior of the microparticles. This phenomenon was exploited to encapsulate a model hydrophobic fluorophore, the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride complex, to simulate encapsulation of hydrophobic drug molecules. Thermogravimetric analysis reveals that, in these microparticles, the Calcium Carbonate and the phospholipid exhibit strong interactions.
Melgardt M De Villiers - One of the best experts on this subject based on the ideXlab platform.
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composite phospholipid Calcium Carbonate microparticles influence of anionic phospholipids on the crystallization of Calcium Carbonate
Journal of Physical Chemistry B, 2006Co-Authors: Krishna Gopal, Zonghuan Lu, Melgardt M De Villiers, Yuri LvovAbstract:The synthesis and characterization of Calcium Carbonate microparticles by reaction of Calcium chloride and ammonium biCarbonate in the presence of negatively charged phospholipid mixtures of negative and zwitterionic phospholipids has been reported. Negatively charged phospholipids influence the crystal morphology of Calcium Carbonate and induce the formation of thermodynamically less stable veterite polymorph as opposed to calcite polymorph. The phospholipids are entrapped in the Calcium Carbonate microparticles during the crystallization process, with a uniform distribution of phospholipids in the interior of the microparticles. This phenomenon was exploited to encapsulate a model hydrophobic fluorophore, the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride complex, to simulate encapsulation of hydrophobic drug molecules. Thermogravimetric analysis reveals that, in these microparticles, the Calcium Carbonate and the phospholipid exhibit strong interactions.
Zonghuan Lu - One of the best experts on this subject based on the ideXlab platform.
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composite phospholipid Calcium Carbonate microparticles influence of anionic phospholipids on the crystallization of Calcium Carbonate
Journal of Physical Chemistry B, 2006Co-Authors: Krishna Gopal, Zonghuan Lu, Melgardt M De Villiers, Yuri LvovAbstract:The synthesis and characterization of Calcium Carbonate microparticles by reaction of Calcium chloride and ammonium biCarbonate in the presence of negatively charged phospholipid mixtures of negative and zwitterionic phospholipids has been reported. Negatively charged phospholipids influence the crystal morphology of Calcium Carbonate and induce the formation of thermodynamically less stable veterite polymorph as opposed to calcite polymorph. The phospholipids are entrapped in the Calcium Carbonate microparticles during the crystallization process, with a uniform distribution of phospholipids in the interior of the microparticles. This phenomenon was exploited to encapsulate a model hydrophobic fluorophore, the tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride complex, to simulate encapsulation of hydrophobic drug molecules. Thermogravimetric analysis reveals that, in these microparticles, the Calcium Carbonate and the phospholipid exhibit strong interactions.