Related Experiment Video
Updated: May 10, 2026
05:41
Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
Published on: February 23, 2017
Catalysis, nanostructure and macroscopic property triangle in bioactive calcium-containing ceramic systems
Anikó Meiszterics1, Károly Havancsák, Katalin Sinkó
1Institute of Chemistry, L. Eötvös University, Budapest, H-1117, Hungary.
Summary
Calcium silicate ceramics for implants exhibit tunable properties. Optimizing synthesis with ammonia yields strong, low-solubility materials suitable for biomedical applications.
Area of Science:
- Biomaterials Science
- Ceramic Engineering
- Nanotechnology
Background:
- Calcium silicate ceramics are crucial for long-term implant applications.
- Understanding the relationship between nanostructure and macroscopic properties is key for optimizing performance.
- Chemical synthesis parameters significantly influence ceramic characteristics.
Purpose of the Study:
- To investigate the correlation between nanostructure (aggregate size, crystallinity, porosity) and macroscopic properties (solubility, hardness) of calcium silicate ceramics.
- To evaluate the impact of varying chemical synthesis catalysts on ceramic properties.
- To identify optimal synthesis conditions for biomedical applications.
Main Methods:
- Chemical synthesis of calcium silicate ceramics using various catalysts (base and acids).
- Characterization of nanostructure, including aggregate size, crystallinity, and porosity.
- Assessment of macroscopic properties: solubility in water and simulated body fluids (SBF), and hardness (HV).
Main Results:
- The choice of catalyst during synthesis significantly affects pore size, crystallinity, and mechanical properties.
- Basic catalysts produced ceramics with superior mechanical strength.
- Ammonia, used in specific molar ratios (1.0 or 10.0), resulted in ceramics with excellent hardness (180-200 HV) and low solubility (1-3%) in water and SBF.
- Fine porosity (~50 nm) and a homogeneous amorphous structure contribute to good mechanical character.
Conclusions:
- Optimized chemical synthesis, particularly using ammonia as a catalyst, yields calcium silicate ceramics with properties suitable for biomedical applications.
- The nanostructure, specifically fine porosity and amorphous nature, is critical for achieving desired mechanical strength and low solubility.
- These findings provide a pathway for developing advanced calcium silicate biomaterials.
Related Concept Videos
01:27Catalysis
Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
01:13Introduction to Mechanisms of Enzyme Catalysis
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...