Non-spherical Gold Nanoparticle Silica Coating for Optical Stability
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Solution Overview
Problem
The production of non-spherical nanostructures containing gold results in inefficient yields due to high amounts of byproduct material, making them unsuitable for applications like optical sensing, and bare gold nanoparticles tend to agglomerate, altering their optical properties.
Innovation Solution
A method involving a solution of non-spherical gold nanoparticles with a surfactant coating, where a silica precursor is added at a constant rate to create a homogeneous silica coating, with control over the deposition time and thickness, and optionally adding an iron oxide particulate coating without a linker, to produce stable and functionalized nanostructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If silica precursor solution is added quickly to nanoparticle solution, then synthesis time is reduced, but coating homogeneity deteriorates
Solution Approach 1:
The patent applies the principle of rushing through by adding the silica precursor solution rapidly (at a high rate) to the nanoparticle solution. This quick addition reduces the overall synthesis time while still achieving adequate coating homogeneity through subsequent stirring and reaction processes. The rapid addition skips the time-consuming step of slow, incremental precursor addition.
Solution Approach 2:
The patent applies preliminary action by preparing the nanoparticle solution with appropriate pH adjustment and stirring conditions before adding the silica precursor. This preliminary preparation ensures that when the precursor is added quickly, the reaction conditions are already optimized to maintain coating homogeneity despite the rapid addition rate.
2Reliability
If silica coating thickness is increased to prevent agglomeration, then stability is improved, but yield efficiency deteriorates due to higher byproduct material
Solution Approach 1:
The patent applies parameter changes by optimizing the silica precursor concentration, pH conditions, and reaction time to achieve the minimum necessary coating thickness for preventing agglomeration. By carefully controlling these parameters, the patent achieves adequate stability with thinner coatings, thereby reducing byproduct formation and improving yield efficiency.
Solution Approach 2:
The patent applies partial action by providing just enough silica coating to prevent agglomeration rather than applying a thick coating. This partial coating approach achieves the necessary stability while minimizing the amount of silica material used and reducing byproduct formation, thus improving yield efficiency.
3Manufacturing precision
If deposition time is extended to achieve uniform coating, then coating quality is improved, but production efficiency deteriorates
Solution Approach 1:
The patent applies rushing through by using rapid stirring and optimized pH conditions to accelerate the silica deposition process. This allows uniform coatings to be achieved in shorter deposition times, thereby improving production efficiency while maintaining coating quality.
Solution Approach 2:
The patent applies parameter changes by adjusting pH, temperature, and stirring rate to optimize the deposition kinetics. These parameter optimizations enable faster deposition rates that still produce uniform coatings, resolving the contradiction between coating quality and production efficiency.
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
This method enhances the yield and stability of non-spherical nanostructures, preventing agglomeration and maintaining their optical properties for applications such as optical sensing, while allowing for magnetic functionalization.
Implementation Method 1
adding a silica precursor solution to the solution of nanoparticles
Implementation Method 2
maintaining the homogeneous silica deposition solution of NPs at a temperature that is between 25° C. and 40° C. for a predetermined reaction time to achieve a solution of silica-coated NPs
Implementation Method 3
a further step adds iron oxide NPs to form a particulate coating onto the silica-coated NPs
Data Source
AI summary
The disclosure provides methods of synthesizing non-spherical nanostructures. One embodiment has steps of providing a solution of nanoparticles (NPs) wherein each of the NPs comprises a non-spherical NP that includes gold and a surfactant coating covering the non-spherical NP; mixing the NPs and a pH modifier solution making a pH-modified solution of NPs having a pH within a predefined pH range; and adding a silica precursor solution to the solution of nanoparticles at a constant rate for at least one (1) minute to provide a homogeneous silica solution of NPs. Another embodiment has steps of providing a solution of NPs wherein each of the NPs comprises a non-spherical NP that includes gold and a surfactant coating covering the non-spherical NP; and adding a silica precursor solution to the solution of nanoparticles at a constant rate for at least one (1) minute to provide a homogeneous silica solution of NPs.