Gold Nanoparticle Synthesis via Semipermeable Membrane Dialysis
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Solution Overview
Problem
Existing methods for synthesizing self-assembling gold nanoparticles often result in low quality ratios and require centrifugation to separate nanoparticles from gold colloid, which decreases yield and is inefficient.
Innovation Solution
A method involving dialysis with a semipermeable membrane to self-assemble gold nanoparticles, allowing for selective adsorption of gold colloid or nanoparticles, thereby enhancing the quality ratio without the need for centrifugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If centrifugation is used to separate nanoparticles from gold colloid, then separation efficiency is improved, but yield decreases and process complexity increases
Solution Approach 1:
The patent extracts the harmful gold colloid byproduct from the reaction mixture using a semipermeable membrane that selectively removes colloidal particles while retaining the desired gold nanoparticles, thereby improving separation efficiency without requiring centrifugation and maintaining high yield
Solution Approach 2:
The semipermeable membrane acts as an intermediary between the gold nanoparticle synthesis reaction and the separation process, enabling selective removal of gold colloid through its pore structure that allows passage of colloidal particles while retaining nanoparticles, thus achieving efficient separation without mechanical centrifugation
2Manufacturing precision
If multiple rounds of centrifugation are performed to remove gold colloid, then purity is improved, but productivity decreases and time consumption increases
Solution Approach 1:
The patent segments the separation function into the semipermeable membrane structure, which continuously removes gold colloid during the synthesis process itself, eliminating the need for multiple sequential centrifugation rounds and thereby maintaining high purity while significantly improving productivity
Solution Approach 2:
The semipermeable membrane enables continuous removal of gold colloid throughout the synthesis process, maintaining constant separation action without interrupting nanoparticle formation, whereas centrifugation requires discrete, intermittent processing steps that reduce overall productivity
3Ease of manufacture
If conventional synthesis methods are used without dialysis, then process simplicity is maintained, but quality ratio remains low due to gold colloid contamination
Solution Approach 1:
The semipermeable membrane serves as a passive intermediary that automatically separates gold colloid from nanoparticles based on size differences, requiring no complex operational steps beyond inserting the membrane into the reaction vessel, thus maintaining ease of manufacture while dramatically improving quality ratio
Solution Approach 2:
The system performs self-separation through the semipermeable membrane's inherent selective permeability properties, where the membrane automatically filters gold colloid from the reaction mixture based on physical size criteria without requiring external intervention or complex processing steps, thereby maintaining simplicity while improving quality
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 achieves a significantly higher yield of gold nanoparticles with improved quality ratios above 1.8, eliminating the need for centrifugation and optimizing the absorbance peak in the NIR region.
Implementation Method 1
a surface able to selectively adsorb certain subpopulations of nanoparticles within a mixture to effectively reduce the concentration of said subpopulations in the final product mixture
Implementation Method 2
by dialyzing samples during the self-assembly process
Data Source
AI summary
Embodiments disclosed herein relate to a method for synthesizing self-assembling nanoparticles with defined plasmon resonances. More particularly, certain embodiments disclosed herein relate to an improved method for synthesizing self-assembling gold nanoparticles by dialyzing samples during the self-assembly process or in presence of a surface to reduce certain subpopulations.