Related Experiment Video
Updated: Jun 20, 2026
14:49
Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro
Published on: April 15, 2022
Si complexes in calcium phosphate biomaterials
P Gillespie1, Gang Wu, M Sayer
1Department of Physics, Queen's University, Kingston, Canada.
Journal of Materials Science. Materials in Medicine
|August 29, 2009
Summary
Silicon doping in calcium phosphate bioceramics creates specific silicon structures (Q(1)) that compensate for charge imbalances. This finding helps explain how silicon stabilizes alpha-tricalcium phosphate at lower temperatures.
Area of Science:
- Biomaterials Science
- Solid-State Chemistry
- Materials Characterization
Background:
- Calcium phosphate bioceramics are crucial in bone regeneration.
- Silicon doping enhances bioceramic properties but its mechanism is unclear.
- Understanding silicon's role is key for advanced biomaterial development.
Purpose of the Study:
- To investigate silicon complexes in silicon-doped calcium phosphate bioceramics.
- To identify the charge compensation mechanisms of silicon dopants.
- To elucidate the structural role of silicon in these materials.
Main Methods:
- Utilized (29)Si magic angle spinning nuclear magnetic resonance (NMR) spectroscopy.
- Analyzed three distinct silicon-doped calcium phosphate materials: multiphase Si-stabilized alpha-tricalcium phosphate (alpha-TCP)/hydroxyapatite (HA), single-phase Si-HA, and single-phase Si-alpha-TCP.
- Correlated NMR findings with phase evolution in silicon-stabilized bioceramics.
Main Results:
- Silicon dopants consistently formed Q(1) structures across all studied materials.
- Q(1) structures involve two silicate tetrahedra sharing an oxygen atom.
- This structural arrangement creates an oxygen vacancy, compensating for the substitution of two silicon atoms for phosphorus atoms.
Conclusions:
- Silicon dopants in calcium phosphate bioceramics adopt Q(1) structures.
- Oxygen vacancies generated by Q(1) structures serve as the primary charge compensation mechanism.
- This mechanism provides insight into the phase stabilization of alpha-TCP by silicon at lower sintering temperatures.
More Related Videos
Related Concept Videos
01:31Essential Minerals for Bone Health
The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
01:27Roles 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.
The calcium concentration in blood plasma is primarily regulated...
The calcium concentration in blood plasma is primarily regulated...
01:18The Bone Matrix
Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...
01:21Skeleton and Calcium Homeostasis
Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
04:01Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
01:29Biofilms
Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...