Photoresponsive Nanoparticle Ink With Shell Ligands for Stable Dispersion
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Solution Overview
Problem
Existing ink compositions containing photoresponsive nanoparticles face issues with dispersion stability across various media due to aggregation caused by interface interactions, affecting quantum efficiency in applications like displays and solar cells.
Innovation Solution
An ink composition comprising photoresponsive nanoparticles coated with a shell-like ligand having ionic structural units and a polymer portion, which enhances dispersion stability by coordinating with the nanoparticles through electrostatic interactions and protecting them from solvent and polymerizable compound effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If photoresponsive nanoparticles are dispersed in a medium, then patterning and material handling are facilitated, but the nanoparticles aggregate due to interface interactions and dispersion stability deteriorates
Solution Approach 1:
The patent introduces a shell-like ligand as an intermediary substance between the nanoparticle surface and the medium. This ligand has a specific structure with a hydrophobic portion and a hydrophilic portion that mediates the interaction between the nanoparticle and medium, preventing direct harmful interface interactions while maintaining dispersibility and stability in the medium.
Solution Approach 2:
The shell-like ligand exhibits local quality differentiation with distinct hydrophobic and hydrophilic portions. The hydrophobic portion interfaces with the nanoparticle surface while the hydrophilic portion interfaces with the medium, creating localized functional zones that simultaneously satisfy compatibility with both the nanoparticle and medium, thereby preventing aggregation.
2Reliability
If the particle size of photoresponsive nanoparticles is reduced to several nanometers to tens of nanometers, then quantum efficiency is improved, but aggregation due to interface effects increases and dispersibility deteriorates
Solution Approach 1:
For small nanoparticles with high surface area-to-volume ratios that are prone to aggregation, the shell-like ligand acts as a protective intermediary that stabilizes the particle surface. The ligand's specific structure prevents harmful interface interactions that would otherwise cause aggregation, thereby maintaining both the small particle size needed for high quantum efficiency and the dispersibility required for practical application.
Solution Approach 2:
The invention creates a composite structure combining the nanoparticle core with the shell-like ligand. This composite material maintains the quantum confinement effects of the small nanoparticle while the ligand shell provides steric and electronic protection against aggregation, achieving both high quantum efficiency and stable dispersibility.
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
The shell-like ligand structure stabilizes nanoparticle dispersion, maintaining quantum efficiency and preventing aggregation, thereby ensuring consistent performance in diverse media applications.
Implementation Method 1
a shell-like ligand having an ionic structural unit and a polymer portion bound to the nanoparticle at a plurality of positions via a plurality of binding portions
Data Source
AI summary
An ink composition 200 contains a photoresponsive nanoparticle 10, a shell-like ligand 20 including a plurality of binding portions 30 with an ionic structural unit and a polymer portion 40 bound to the nanoparticle 10 at a plurality of positions via the plurality of binding portions 30, and a polymerizable compound 50.