Amine-Functionalized Polymer Surface Functionalization for Nanoparticle Positioning
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Solution Overview
Problem
Existing methods for arranging nanoparticles (NPs) and microparticles in 1D, 2D, and 3D microstructures lack versatility and are not suitable for complex arrangements, often resulting in aggregation and unclean substrate surfaces.
Innovation Solution
The use of polymers comprising polymerized amine-functionalized monomer units, achieved through radiation-induced polymerization, allows for the precise and selective positioning of NPs and microparticles on solid supports, including complex 3D microstructures, by functionalizing the surface with negatively charged ligands at a specific pH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical methods are used for NP immobilization, then NPs can be attached to substrate surface, but it becomes difficult to eliminate unfixed NPs and random positioning occurs
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing the substrate surface with specific chemical groups (carboxyl, hydroxyl, or amino groups) before NP attachment. This pre-prepared surface chemistry enables selective and controlled NP binding, allowing unfixed NPs to be easily removed while ensuring precise positioning of attached NPs. The preliminary surface functionalization creates a controlled environment that prevents random positioning.
Solution Approach 2:
The patent utilizes parameter changes by adjusting pH levels to control the charge state of surface functional groups and NP surface charges. By varying pH, the patent optimizes electrostatic interactions for selective NP attachment while maintaining the ability to remove unwanted NPs. This parameter control enables precise positioning without the drawbacks of conventional chemical methods.
2Adaptability or versatility
If conventional NP assembly methods are used, then some NP arrangements can be achieved, but they lack versatility for complex 1D, 2D, and 3D microstructures
Solution Approach 1:
The patent achieves universality by developing a multi-functional surface functionalization approach that works across diverse NP types (metal, metal oxide, semiconductor, polymer) and various dimensional configurations (1D, 2D, 3D). The method uses universal surface functional groups that can be applied to different substrates and NP compositions, providing a versatile platform for complex microstructure fabrication while maintaining high positioning precision through controlled electrostatic interactions.
Solution Approach 2:
The patent employs parameter changes by systematically varying pH, ionic strength, and surface functional group density to optimize NP assembly for different microstructure complexities. This parameter control enables the same fundamental method to be adapted across diverse applications from simple 1D arrays to complex 3D architectures, achieving both versatility and manufacturing precision.
3Manufacturing precision
If top-down techniques are used for NP positioning, then NP arrangement can be achieved, but the process requires complex sandwich-shaped patterning systems with many adjusted physical parameters
Solution Approach 1:
The patent replaces complex mechanical patterning systems with a chemistry-based approach. Instead of using sandwich-shaped physical structures and multiple mechanical parameters, the patent uses electrostatic interactions between charged surface functional groups and charged NP surfaces. This substitution dramatically simplifies the system while maintaining or improving positioning precision through selective chemical binding.
Solution Approach 2:
The patent uses parameter changes in solution chemistry (pH, ionic strength) to control NP positioning, replacing the need for complex physical parameter adjustments in mechanical patterning systems. This chemical parameter control achieves precise NP positioning with a much simpler system architecture.
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 enables the highly selective arrangement of NPs and microparticles of varying sizes and natures within complex microstructures, avoiding aggregation and ensuring a clean substrate surface, thereby enhancing the potential for applications in plasmonics, photonics, catalysis, and biotechnology.
Implementation Method 1
contacting at least the surface coated with an amine-functionalized polymer obtained in step iii) with nano- or microparticles functionalized with negatively charged ligands, at a pH equal or less than (pKa of the amine, in particular of formula (I), + 1), to obtain a solid support with a surface functionalized with nano- or microparticles
Implementation Method 2
polymerization of the composition of step ii) in contact with the surface to functionalize, to obtain a surface coated with an amine-functionalized polymer
Implementation Method 3
thermally induced (or activated) polymerization
Data Source
Figure 1A~2D
Figure 3A~4B
AI summary
The present invention is in the field of surface functionalization of a surface with nano- or microparticles. In particular, the invention concerns a process for functionalizing a surface of a solid support with nano- or microparticles, polymers comprising polymerized amine-functionalized monomer units, their use to functionalize a solid support with nano- or microparticles, and the resulting nano- or microparticles functionalized polymers comprising polymerized amine-functionalized monomer units.