Mesoporous Silica Wrapped Nanoparticles Multi-Core Synthesis
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Solution Overview
Problem
Current mesoporous silica wrapped nanoparticles face challenges such as limited single-type wrapping, high-temperature and lengthy processes, use of non-polar solvents, uncontrollable particle sizes, and reduced specific surface area due to multi-layer wrapping, which restrict their applications in medicine and environmental fields.
Innovation Solution
A method for preparing mesoporous silica wrapped nanoparticle composite nanomaterials involving dispersing nanoparticles in an aqueous ethanol solution with ammonia water, adding cetyltrimethylammonium bromide and tetraethyl orthosilicate under ultrasound, allowing for stable and uniform mesoporous silica shell formation without interface bonding, enabling multi-core wrapping and controlled particle sizes below 100 nm, suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of nanoparticles are wrapped in a single mesoporous silica shell, then the functionality and application range are improved, but the preparation complexity and difficulty of controlling uniformity increase
Solution Approach 1:
The patent applies preliminary action by pre-modifying the nanoparticle surfaces with specific functional groups before the wrapping process. This pre-preparation enables different types of nanoparticles to be distinguished and positioned within the mesoporous silica shell, facilitating multi-core wrapping while maintaining preparation feasibility and uniformity.
Solution Approach 2:
The patent uses functional groups as intermediaries between different nanoparticles and the mesoporous silica shell. These intermediary groups facilitate the selective binding and uniform distribution of multiple nanoparticle types within the shell, reducing preparation complexity while enhancing functionality.
2Stability of the object's composition
If high temperature processing is used to prepare mesoporous silica wrapped nanoparticles, then the structural stability is improved, but the energy consumption and process time increase
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and surface properties of the nanoparticle cores. This enables the formation of stable mesoporous silica shells at lower temperatures through enhanced chemical compatibility and controlled hydrolysis conditions, thereby reducing energy consumption while maintaining structural stability.
3Reliability
If non-polar solvents are used in the preparation process, then the mesoporous silica shell formation is improved, but the environmental friendliness and application range are reduced
Solution Approach 1:
The patent applies parameter changes by adjusting the surface chemistry of nanoparticles and the composition of the sol-gel system. This enables high-quality mesoporous silica shell formation using polar or aqueous solvents instead of non-polar solvents, maintaining shell formation quality while improving environmental friendliness and expanding application range.
4Area of stationary object
If the nanoparticle size is reduced to increase specific surface area, then the activity is improved, but the stability and control of dispersibility become more difficult
Solution Approach 1:
The patent uses surface functional groups as intermediaries that provide steric and electrostatic stabilization to small nanoparticles. These intermediary groups prevent aggregation and improve dispersibility stability, enabling the use of ultrasmall nanoparticles with high specific surface area while maintaining colloidal stability.
5Length of stationary object
If a thin silica shell is used to control particle size below 100 nm, then the size control is improved, but the stability of the composite nanomaterial is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the core nanoparticle properties, including size, surface chemistry, and composition. This enables the formation of sufficiently thin silica shells to maintain particle size below 100 nm while the optimized core provides structural support and stability, preventing shell collapse or degradation.
Solution Approach 2:
The patent creates a composite structure where the core nanoparticle and silica shell work synergistically. The core provides structural stability and size control, while the thin shell maintains the desired small particle size. This composite approach resolves the contradiction between thin shell requirement and overall stability.
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 achieves stable, highly active, and multifunctional composite nanomaterials with controlled sizes, suitable for medical and environmental applications, using environmentally friendly and cost-effective hydrophilic solvents at room temperature, allowing for versatile use in medicine, catalysts, energy generation, and pollution control.
Implementation Method 1
dissolving cetyltrimethylammonium bromide in an identical aqueous ethanol solution to obtain solution B; adding tetraethyl orthosilicate dropwise to solution C
Implementation Method 2
adding tetraethyl orthosilicate dropwise to solution C, followed by consecutive stirring, solid-liquid separation and purification to obtain the composite nanomaterial
Implementation Method 3
adding solution B dropwise to solution A under ultrasound, and then continue performing ultrasound to obtain solution C
Implementation Method 4
dispersing a nanoparticle in an aqueous ethanol solution, then adding ammonia water and stirring thoroughly to obtain solution A
Data Source
AI summary
The present disclosure relates to mesoporous silica wrapped nanoparticle composite nanomaterial, preparation method thereof, and use thereof. In the present disclosure, a nanoparticle is dispersed in an aqueous ethanol solution. Then, ammonia water is added to adjust the pH. After that, cetyltrimethylammonium bromide in an aqueous ethanol solution is added dropwise, and ultrasound is continued, before tetraethyl orthosilicate is added dropwise. The mixture is purified to produce a composite nanomaterial that is stable, controllable, and consistent in size; the shell of the composite nanomaterial is mesoporous silica, the core of the composite nanomaterial is a nanoparticle. Dual-core or triple-core nanoparticles of different kinds/functions can be wrapped into a single mesoporous silica shell to achieve multi-core wrapping. The method is universal and may be used to wrap various nanometers. The preparation procedure is environmentally friendly, efficient, and may be carried out at room temperature.