Fullerene-Silica Nanoparticles via Reverse Microemulsion
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Solution Overview
Problem
Fullerene molecules exhibit low fluorescence efficiency and poor solubility, making them unsuitable for applications due to their sensitivity to light and environment, and existing fullerene-silica nanocomposites have irregular sizes and shapes, limiting their optical properties studies.
Innovation Solution
Synthesis of uniform fullerene-silica nanoparticles using a reverse microemulsion method where fullerene and silica are directly covalently linked, forming nanoparticles with enhanced fluorescence properties suitable for bioimaging and drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fullerene molecules are used as optical materials, then unique optical properties and light absorption are achieved, but fluorescence efficiency is low and solubility is poor
Solution Approach 1:
The patent creates a composite material system by combining fullerene molecules with silica nanoparticles. This composite structure allows the fullerene to retain its unique optical properties and light absorption capabilities while the silica matrix provides stability and enhances fluorescence efficiency. The synergistic combination resolves the contradiction between high light absorption and low fluorescence efficiency.
Solution Approach 2:
The patent applies local quality modification by functionalizing the silica surface with specific groups that interact with fullerene molecules. This creates localized regions of enhanced interaction between the fullerene and silica, improving energy transfer efficiency and fluorescence quantum yield while maintaining the overall structural integrity and optical properties.
2Adaptability or versatility
If fullerene is used in applications, then unique structure and electro-chemical properties are utilized, but solubility in polar solvents is poor and self agglomeration is low
Solution Approach 1:
The patent introduces silica nanoparticles as an intermediary carrier that facilitates the dispersion and solubility of fullerene molecules in polar solvents. The silica surface acts as a mediator between the nonpolar fullerene and polar solvent environment, enabling stable dissolution and preventing agglomeration while preserving the electro-chemical properties for various applications.
3Illumination intensity
If fullerene-silica nanocomposites are synthesized using conventional methods, then some optical properties are achieved, but nanoparticle size and shape are irregular
Solution Approach 1:
The patent employs parameter changes in the synthesis process by controlling pH, temperature, and silica precursor concentration to achieve uniform nanoparticle formation. By optimizing these parameters, the method produces monodisperse spherical nanoparticles with controlled size distribution, resolving the contradiction between obtaining optical properties and achieving manufacturing precision.
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 resulting nanoparticles exhibit strong fluorescence and are harmless to living tissues, enabling their use as bioimaging agents and drug delivery carriers with improved reactivity and stability.
Implementation Method 1
the light absorption is particularly high at ultraviolet regions (213, 257, 329 nm)
Implementation Method 2
fluorescent property of Fullerene, which can be represented as quantum efficiency (QE) of fluorescence
Implementation Method 3
by synthesizing fullerene-silica nanoparticles in the uniform shape with the method of reverse micro emulsion
Implementation Method 4
fullerene and silica are directly linked without requiring linkers
Data Source
AI summary
The present invention relates to fullerene-silica nanoparticles with improved fluorescence, a preparation method of the fullerene-silica nanoparticles, and use thereof. More specifically, the present invention relates to fullerene-silica nanoparticles with improved fluorescence in which fullerene and silica are covalently linked, a preparation method of the fullerene-silica nanoparticles, and use thereof. The preparation method of the fullerene-silica nanoparticles comprises the steps of: adding a surfactant to a non-polar organic solvent and a polar solvent and stirring them to form reverse micelles (step 1); adding fullerene to the reverse micelles formed in the step 1 and stirring them (step 2); and adding a silica precursor and a catalyst to a reaction solution containing the fullerene prepared in the step 2 and stirring them to prepare fullerene-silica nanoparticles (step 3). According to the present invention, fullerene-silica nanoparticles in the form of a uniform spherical shape of tens of nanometers can be prepared. As such prepared fullerene-silica nanoparticles have a large surface area due to a nanometer-sized structure, they have good reactivity. Compared with heavy metals or metal nanoparticles, the fullerene-silica nanoparticles, because of using silica, are harmless to a living body. Further, as the fullerene-silica nanoparticles exhibit strong fluorescence, they can be used as a contrast agent for in-vivo imaging or as a drug delivery carrier.