Nanoparticle Multifunctional Ligand Dispersion Stability
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Solution Overview
Problem
Current nanoparticle technologies face challenges in achieving optimal dispersion and interaction with host materials due to limited chemical miscibility and stability, leading to reduced emission efficiency and aggregation issues.
Innovation Solution
The development of nanoparticles with multifunctional ligands, such as 3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid, that incorporate three or more chemically distinct functional groups, enabling improved chemical miscibility and stability, allowing for homogeneous incorporation into host materials and maintaining emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional ligands are used on nanoparticles, then the nanoparticle structure is simple, but the dispersion stability and compatibility with host materials deteriorate
Solution Approach 1:
The patent applies multi-functionality by designing ligands with multiple functional groups (e.g., amine, carboxyl, phosphine) that simultaneously perform different roles: anchoring to the nanoparticle surface, providing colloidal stability through charge or dipole interactions, and enabling compatibility with host materials. This single multi-functional ligand replaces what would otherwise require multiple separate components, resolving the contradiction between improved dispersion stability and structural complexity.
Solution Approach 2:
The patent employs composite ligand structures combining organic moieties with inorganic coordination groups. These hybrid ligands integrate the benefits of both organic (solubility, steric stabilization) and inorganic (strong surface binding, electrical properties) materials, achieving superior dispersion stability without excessive complexity by leveraging synergistic effects of material composition.
2Adaptability or versatility
If multifunctional ligands with three or more functional groups are used, then chemical miscibility and interaction with host materials improve, but the ligand design and synthesis complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the ligand into distinct functional modules: a nanoparticle-anchoring group (e.g., phosphine, carboxyl), a spacer group for structural flexibility, and multiple interaction groups (e.g., amine, hydroxyl, carbonyl) for host material compatibility. This modular segmentation allows systematic design and simplifies synthesis by enabling stepwise assembly of pre-functionalized building blocks, reducing overall complexity while maintaining high chemical miscibility.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the types, numbers, and positions of functional groups on the ligand to optimize performance. By adjusting ligand parameters (functional group identity, molecular weight, chain length) rather than fundamentally redesigning the entire ligand architecture, the patent achieves improved chemical miscibility with manageable synthesis complexity through controlled modification of existing frameworks.
3Productivity
If nanoparticles aggregate due to lack of compatible ligands, then device manufacturing is simplified, but emission efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing nanoparticles with multifunctional ligands during the nanoparticle synthesis or immediately prior to device assembly. This preliminary ligand attachment ensures proper dispersion and compatibility are established before the nanoparticles are incorporated into the host material, preventing aggregation during device manufacturing while maintaining high emission efficiency. The preliminary functionalization eliminates the need for complex post-processing steps to prevent aggregation.
Data Source
AI summary
A nanoparticle including an inorganic core comprising at least one metal and/or at least one semi-conductor compound comprising at least one metal includes a coating or shell disposed over at least a portion of a surface of the core. The coating can include one or more layers. Each layer of the coating can comprise a metal and/or at least one semiconductor compound. The nanoparticle further includes a ligand attached to a surface of the coating. The ligand is represented by the formula: X-Sp-Z, wherein: X represents: a primary amine group, a secondary amine group, a urea, a thiourea, an imidizole group, an amide group, a carboxylic acid or carboxylate group, a phosphonic or arsonic acid group, a phosphoric acid group, a phosphate group, a phosphite group, a phosphinic acid group, a phosphinate group, a phosphine oxide group, a phosphinite group, a phosphine group, an arsenic acid group, an arsenate group, an arsenous acid group, an arsenite group, an arsinic acid group, an arsine oxide group, or an arsine group; Sp represents a group capable of allowing a transfer of charge or an insulating group; and Z represents a multifunctional group including three or more functional groups capable of communicating a specific property or chemical reactivity to the nanoparticle, wherein at least three of the functional groups are chemically distinct, and wherein Z is not reactive upon exposure to light. Compositions including a nanoparticle in accordance with the invention are also disclosed. Devices including nanoparticle and/or composition in accordance with the invention are disclosed. Methods for preparing nanoparticles in accordance with the invention are disclosed. Other products including a nanoparticle in accordance with the invention are also disclosed.