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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
Published on: February 23, 2017
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Surface Structure of Hydroxyapatite from Simulated Annealing Molecular Dynamics Simulations
Hong Wu1, Dingguo Xu, Mingli Yang1
1Institute of Atomic and Molecular Physics, Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University , Chengdu, Sichuan 610065, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 21, 2016
Summary
Hydroxyapatite (HAP) surface disorder increases with annealing temperature, revealing a new model. This disordered surface structure, about 10 Å thick, has lower surface energy, impacting biomaterial interactions.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Surface Chemistry
Background:
- The bioactivity of hydroxyapatite (HAP) is critically dependent on its surface structure.
- Existing models often simplify HAP surfaces, potentially misrepresenting their behavior in biological environments.
Purpose of the Study:
- To investigate the temperature-dependent structural variations of the HAP (100) surface.
- To propose a new, more accurate model for the HAP surface structure.
Main Methods:
- Molecular dynamics simulated annealing was employed to study the HAP (100) surface.
- Analysis included radial distribution functions, structural factors, and atomic coordination numbers.
Main Results:
- A novel surface structure with a disordered layer (approx. 10 Å thick) was revealed, contrasting with models relaxed at 0 K.
- Disordering increased with annealing temperature up to the melting point and saturated thereafter.
- Annealed surfaces exhibited significantly lower surface energy compared to room-temperature relaxed structures.
- A three-layer model (interior, middle, surface) was proposed to describe the distinct atomic arrangements.
Conclusions:
- The HAP surface exhibits temperature-dependent disorder, challenging previous models.
- The proposed disordered surface model offers a more realistic representation for studying HAP-based biomaterial interactions.
