Precious Metal Nanoparticle Suspension Conductivity Control
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Solution Overview
Problem
Current methods for producing aqueous suspensions of precious metal nanoparticles for bioconjugation face challenges in achieving accurate size control and ion concentration control, leading to instability in colloidal systems due to residual ions and stabilizing agents, which complicates the bioconjugation process.
Innovation Solution
A method involving pulsed laser ablation in liquid (PLAL) and purification of chemically synthesized nanocolloids, where electrical conductivity is monitored and adjusted to maintain it at 25 μS/cm or less, ensuring precise control of ion concentration and nanoparticle size, thereby stabilizing the colloidal suspension for effective bioconjugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis processes are used to produce PMNCs, then the PMNPs can be generated efficiently, but residual ions and stabilizing agents remain in the colloidal solution causing instability during bioconjugation
Solution Approach 1:
The patent extracts and removes harmful residual ions and stabilizing agents from the colloidal solution through purification processes such as dialysis, centrifugation, or filtration. This extraction eliminates the source of instability while preserving the nanoparticle core, resolving the contradiction between efficient chemical synthesis and colloidal stability during bioconjugation
Solution Approach 2:
The patent changes the ionic strength parameter of the colloidal solution by controlling electrolyte concentration and composition. By optimizing these parameters, the patent achieves both efficient nanoparticle synthesis and stable colloidal suspension suitable for bioconjugation applications
2Stability of the object's composition
If stabilizing agents are added to prevent aggregation, then the PMNPs remain suspended in the colloidal solution, but the stabilizing agents cause instability during subsequent bioconjugation processes
Solution Approach 1:
The patent removes stabilizing agents from the colloidal solution through purification techniques while maintaining nanoparticle suspension stability. This extraction eliminates the conflict between short-term colloidal stability and long-term bioconjugation reliability
Solution Approach 2:
The patent introduces controlled electrolytes as intermediary substances that mediate between nanoparticle stability and bioconjugation compatibility. These electrolytes provide the necessary ionic environment for stable suspension without interfering with subsequent bioconjugation reactions
3Adaptability or versatility
If ligand exchange reactions are performed on PMNCs, then surface functionalization is achieved, but complete ligand exchange is difficult to achieve while maintaining colloidal stability
Solution Approach 1:
The patent optimizes reaction parameters including ionic strength, pH, temperature, and ligand concentration to achieve complete ligand exchange while maintaining colloidal stability. By carefully controlling these parameters, the patent enables thorough surface functionalization without causing nanoparticle aggregation or precipitation
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 approach results in stable colloidal suspensions with controlled nanoparticle sizes, reducing the risk of precipitation and aggregation during bioconjugation, enhancing the reliability and efficiency of the process.
Implementation Method 1
delivering laser pulses to the target material thereby ablasting the target material and forming a colloidal suspension of the precious metal nanoparticles
Implementation Method 2
monitoring an electric conductivity of the dispersion medium with one or more conductivity monitoring devices
Data Source
AI summary
The present disclosure is directed to methods of preparing stable suspensions of precious metal nanoparticles and methods for attaching bio-molecules to the nanoparticles. The formation of nanoparticles can be accomplished by either chemical synthesis or pulsed laser ablation in a liquid. The present disclosure reveals the importance of controlling the conductivity of the dispersion medium during pulsed laser ablation in a liquid to control the particle size of the nanoparticles. The present disclosure also reveals the importance of adjusting and maintaining the conductivity in a range of 25 μS/cm or less during storage of the nanoparticles and just prior to performing bioconjugation reactions. The control of conductivity is an important process for maintaining the nanoparticles as a stable non-aggregated colloidal suspension in a dispersion medium.