Carbon Dot Core-Shell Particles for Stable Water Dispersibility
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Solution Overview
Problem
Conventional fluorescent particles, particularly those based on inorganic materials, face challenges with stability, dispersibility in water, and potential toxicity, which limit their applications in bioimaging and other fields.
Innovation Solution
The development of fluorescent core-shell particles using carbon dots within a hydrophilic polymer shell, synthesized through a mild reaction process with organic acids, enhances stability and reduces toxicity, offering improved dispersibility in aqueous environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic particles like quantum dots are used for fluorescent particles, then photoluminescent performance is improved, but stability in aqueous environments deteriorates due to aggregation
Solution Approach 1:
The patent combines carbon dots (fluorophore) with a polymer shell (polymer composite) to create core-shell structured fluorescent particles. This composite structure allows the carbon dots to provide photoluminescence while the polymer shell prevents aggregation and enhances stability in aqueous environments, resolving the contradiction between photoluminescent performance and stability.
2Illumination intensity
If inorganic particles are used for fluorescent particles, then photoluminescent performance is improved, but toxicity concerns worsen due to heavy metals
Solution Approach 1:
The patent replaces toxic inorganic materials (quantum dots containing heavy metals) with carbon dots, which are biocompatible and non-toxic. Carbon dots can be synthesized from organic acid precursors and provide similar photoluminescent properties without the harmful effects of heavy metals, thus eliminating toxicity concerns while maintaining illumination performance.
3Stability of the object's composition
If surface modifications or surfactants are used to enhance dispersibility of inorganic particles, then dispersibility in water is improved, but device complexity worsens due to additional synthesis steps
Solution Approach 1:
The patent incorporates hydrophilic polymer chains into the shell structure during the initial synthesis of fluorescent particles. This preliminary inclusion of dispersibility-enhancing components eliminates the need for subsequent surface modification steps or surfactant addition, thereby improving water dispersibility while avoiding additional synthesis complexity.
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 particles exhibit excellent water dispersibility and photoluminescent performance, addressing the limitations of conventional inorganic particles and opening up new applications while mitigating toxicity concerns.
Implementation Method 1
the plurality of carbon dots is prepared by hydrothermal treatment of an organic acid
Implementation Method 2
Fluorescent particles have attracted considerable attention due to potential applications in bioimaging, sensing, energy-saving technologies and as additives
Data Source
AI summary
Fluorescent core-shell particles comprising a core, a first shell disposed on a surface of the core, and a second shell disposed on a surface of the first shell, wherein the core comprises a first polymer selected from a group consisting of a poly(alkyl acrylate), a poly(alkyl methacrylate), and copolymers thereof, the first shell comprises a first polyamine and a second polymer selected from a group consisting of a poly(alkyl acrylate), a poly(alkyl methacrylate), and copolymers thereof, and the second shell comprises a second polyamine and a plurality of carbon dots, wherein at least a portion of the first polyamine is grafted to the second polymer; methods of use and preparation thereof.