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Related Concept Videos

Roles of Electrolytes: Calcium and Phosphate01:27

Roles of Electrolytes: Calcium and Phosphate

Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Calcium Carbonate Formation in the Presence of Biopolymeric Additives
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Poly(ethylene imine)-controlled calcium phosphate mineralization.

Andriy Shkilnyy1, Alwin Friedrich, Brigitte Tiersch

  • 1Institute of Chemistry, University of Potsdam, D-14476 Golm, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 22, 2008
PubMed
Summary

Poly(ethylene imine) effectively templated calcium phosphate/polymer hybrid particles. This method yields small, spherical particles at pH above 8, offering a new route for hybrid material synthesis.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Calcium phosphate (CaP) particles are crucial in biomaterials and nanotechnology.
  • Controlling the size and morphology of CaP particles is essential for their applications.
  • Poly(ethylene imine) (PEI) is a versatile polymer with potential in material fabrication.

Purpose of the Study:

  • To investigate the use of poly(ethylene imine) (PEI) as a template for fabricating calcium phosphate (CaP)/polymer hybrid particles.
  • To characterize the morphology and formation pathway of these hybrid particles under different pH conditions.
  • To understand the role of PEI in controlling particle size and stabilization.

Main Methods:

  • Fabrication of CaP/PEI hybrid particles via a mineralization-trapping pathway.
  • Utilizing pH control (above 8 and low pH) during the synthesis process.
  • Characterization of particle size, morphology, and composition.

Main Results:

  • Spherical CaP/PEI hybrid particles (ca. 6 nm CaP core) were efficiently fabricated at pH > 8.
  • PEI acts as a template, precipitating onto CaP nuclei to prevent excessive growth.
  • Particle stabilization is achieved through PEI re-protonation on the CaP surface.
  • Larger particles formed at low pH, suggesting heterogeneous nucleation and growth.

Conclusions:

  • Poly(ethylene imine) is an effective template for synthesizing uniform, small CaP/polymer hybrid particles.
  • The mineralization-trapping pathway, controlled by PEI precipitation, is key to forming small particles at pH > 8.
  • pH significantly influences the particle formation mechanism and resulting morphology, with low pH favoring larger particle growth.