Cesium Tungsten Oxide Nanoparticle Dispersion Stabilization

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Solution Overview

Problem

Current inkjet printing technologies face challenges in maintaining the stability of cesium tungsten oxide nanoparticle dispersions, leading to issues such as agglomeration, settling, and changes in pH, particle size, viscosity, and infrared absorbance over time, which affect the shelf life and performance of the inkjet compositions.

Innovation Solution

Incorporating a zwitterionic stabilizer into the water-based dispersion or jettable composition containing cesium tungsten oxide nanoparticles, which forms a protective layer around the nanoparticles, preventing agglomeration and maintaining stability by minimizing changes in pH, particle size, viscosity, and infrared absorbance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cesium tungsten oxide nanoparticles are used in inkjet printing, then high-speed recording and multi-color recording capability are achieved, but the dispersion stability deteriorates leading to agglomeration and settling

Engineering Contradiction:

Improvehigh-speed recording capabilityVSAvoiddispersion stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

A zwitterionic stabilizer is introduced as an intermediary substance between the cesium tungsten oxide nanoparticles and the aqueous environment. The stabilizer forms a protective layer around the nanoparticles, preventing direct interaction between particles that would lead to agglomeration. This mediator maintains dispersion stability while allowing the inkjet printing functionality to proceed at high speeds.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the chemical and physical parameters of the nanoparticle surface through the addition of the zwitterionic stabilizer. This changes the surface charge, hydrophobicity, and interfacial properties of the nanoparticles, transforming them from a unstable dispersion-prone state to a stable, collision-resistant state that maintains its properties during high-speed printing operations.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If cesium tungsten oxide nanoparticle dispersion is used, then infrared absorbance and particle size properties are achieved, but pH and particle size changes occur over time

Engineering Contradiction:

Improveinfrared absorbance measurementVSAvoidpH and particle size stability

Core Design Contradiction:

Measurement precisionVSStability of the object's composition

Solution Approach 1:

The zwitterionic stabilizer acts as a protective intermediary that isolates the cesium tungsten oxide nanoparticles from pH-dependent chemical reactions and aggregation processes. This protective layer prevents direct contact between the nanoparticles and the aqueous environment, maintaining constant pH and particle size properties over extended periods, thereby ensuring reliable infrared absorbance measurements.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The zwitterionic stabilizer provides beforehand cushioning by forming a protective barrier around the nanoparticles before any degradation can occur. This pre-established protective layer prevents subsequent changes in pH and particle size, ensuring that the infrared absorbance properties remain consistent and measurable throughout the shelf life of the composition.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Stability of the object's composition

If zwitterionic stabilizer is added to enhance dispersion stability, then agglomeration is prevented, but device complexity increases

Engineering Contradiction:

Improvedispersion stabilityVSAvoidcomposition complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The zwitterionic stabilizer is used in relatively small concentrations compared to the nanoparticle content, acting as an efficient protective agent that provides stable dispersion without requiring complex formulation systems. The stabilizer molecules are small and can be easily incorporated into the inkjet composition, providing maximum stability benefit with minimal addition to the overall system complexity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 use of a zwitterionic stabilizer enhances the stability of cesium tungsten oxide nanoparticle dispersions and jettable compositions, ensuring minimal changes over time, thereby extending shelf life and maintaining the performance and jettability of the inkjet compositions.

Implementation Method 1

Methodology Applied

Scientific EffectZwitterionic stabilization:

Implementation Method 2

maintaining stability by minimizing changes in pH, particle size, viscosity, and infrared absorbance

Methodology Applied

Scientific EffectColloidal stability: Colloid

Data Source

PatentUS11820906B2Dispersion and jettable composition containing cesium tungsten oxide nanoparticles and a zwitterionic stabilizer

Publication Date: 2023.11.21 PERIDOT PRINT LLC

AI summary

An example of a dispersion includes cesium tungsten oxide nanoparticles, a zwitterionic stabilizer, and a balance of water. An example of a jettable composition includes cesium tungsten oxide nanoparticles, a zwitterionic stabilizer, a surfactant, a co-solvent, and a balance of water. A method for improving the stabilization of a jettable composition includes incorporating a zwitterionic stabilizer in the jettable composition, which includes the cesium tungsten oxide nanoparticles, the surfactant, the co-solvent, and the balance of water.