Selenium-Doped Hydroxyapatite Rods Prevent Agglomeration
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Solution Overview
Problem
Current methods for preparing selenium-doped hydroxyapatite result in nano-sized materials with poor dispersibility and severe agglomeration, limiting their application as a multi-functional bone repair material with anti-tumor and antibacterial properties.
Innovation Solution
A method involving the dropwise addition of a phosphate and selenite solution to a calcium salt solution with a dispersing agent, followed by a controlled hydrothermal reaction, to produce selenium-doped hydroxyapatite with a rod-like structure and improved dispersibility, achieving sizes up to micrometer scale and a molar substitution of selenium up to 10%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to prepare selenium-doped hydroxyapatite, then the material can be obtained, but the dispersibility is poor and agglomeration is severe
Solution Approach 1:
The patent introduces a dispersing agent as an intermediary substance that prevents agglomeration during the hydrothermal reaction. This mediator interacts with the selenium-doped hydroxyapatite particles to maintain their dispersion stability, directly addressing the agglomeration problem while improving dispersibility
Solution Approach 2:
The patent optimizes multiple parameters including pH value (9-10), temperature (80-90°C), reaction time (1.5-2.5 hours), and selenium doping concentration (0.01-10%) to control particle formation and prevent agglomeration. These parameter changes enable the formation of well-dispersed rod-like crystals while minimizing harmful agglomeration
2Length of moving object
If conventional methods are used, then selenium-doped hydroxyapatite can be prepared, but the material size is limited to nano-scale with poor dispersibility
Solution Approach 1:
The patent changes the hydrothermal reaction parameters (temperature: 190-210°C, time: 12-24 hours, pH: 9-10) to enable the formation of micrometer-scale rod-like crystals instead of nano-particles. These parameter adjustments allow for larger crystal growth while maintaining good dispersibility through controlled nucleation and growth mechanisms
Solution Approach 2:
The patent transitions from producing zero-dimensional nano-particles to one-dimensional rod-like structures with micrometer-scale lengths. This dimensional change enables better dispersibility and prevents clogging issues while maintaining the beneficial selenium doping effects
3Adaptability or versatility
If a complex system is used for preparation, then some special biological properties can be achieved, but the preparation process becomes complicated
Solution Approach 1:
The patent creates a multi-functional selenium-doped hydroxyapatite material that simultaneously provides osteoconductivity, anti-tumor, and antibacterial properties through a single preparation process. This universal approach achieves multiple biological functions without requiring complex multi-step procedures or additional processing stages
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method yields selenium-doped hydroxyapatite with a single crystal, rod-like structure and good dispersibility, preventing clogging issues and enhancing its potential as a multi-functional material for bone repair and anti-tumor applications.
Implementation Method 1
adding a mixed solution of a phosphate and a selenite dropwise to a mixed solution of a calcium salt and a dispersing agent, and reacting for 1.5-2.5 hrs at a controlled temperature of 80-90° C., to obtain a solution of a calcium phosphate amorphous precursor
Implementation Method 2
followed by performing a hydrothermal reaction at 190-210° C., to obtain the selenium-doped hydroxyapatite having a rod-like structure
Implementation Method 3
the selenium-doped hydroxyapatite provided is a single crystal having a rod-like structure
Data Source
AI summary
The invention relates to a selenium-doped hydroxyapatite and a preparation method thereof. The selenium-doped hydroxyapatite provided is a single crystal comprising a rod-like structure, a uniform morphology, and a good dispersibility. The preparation method comprises adding a mixed solution of a phosphate and a selenite dropwise to a mixed solution of a calcium salt and a dispersing agent, and reacting for 1.5-2.5 hrs at a controlled temperature of 80-90° C., to obtain a solution of a calcium phosphate amorphous precursor, followed by performing a hydrothermal reaction at 190-210° C., to obtain a selenium-doped hydroxyapatite comprising a rod-like structure. Compared with selenium-doped hydroxyapatite with severe agglomeration, the selenium-doped hydroxyapatite provided in the present invention comprises good dispersibility and able to have better prevention of clogging problem in human body when in use, thus having a good prospect using as a multi-functional new material for bone repair in patients as a repair material for bone defects, an anti-tumor, etc.