Quantum Dot Concentration by Salt-Induced Phase Separation

Solution Overview

Problem

Existing methods for concentrating quantum dots in aqueous solutions require large-scale facilities and significant energy input, making them inefficient and costly.

Innovation Solution

A method involving the dissolution of quaternary ammonium salt and potassium salt in a quantum dot-containing aqueous solution, followed by heating to induce phase separation into quaternary ammonium and potassium salt phases, allowing quantum dots to be concentrated in one phase, which is then separated by fractionation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If heating and depressurizing are used to evaporate water and concentrate quantum dots, then quantum dot concentration is achieved, but large-scale facilities and huge energy consumption are required

Engineering Contradiction:

Improvequantum dot concentrationVSAvoidenergy consumption

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The invention utilizes liquid-liquid phase separation by adding salts to the aqueous solution, causing the solution to separate into two liquid phases with quantum dots concentrated in one phase. This phase transition approach replaces thermal evaporation, achieving concentration without requiring large-scale facilities or huge energy input.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The invention changes the chemical parameters of the solution by adding specific salts (quaternary ammonium salt and potassium salt) to induce phase separation. This parameter change approach enables quantum dot concentration through chemical means rather than physical evaporation, significantly reducing energy consumption.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If heating and depressurizing are used to evaporate water and concentrate quantum dots, then quantum dot concentration is achieved, but large-scale facilities are required

Engineering Contradiction:

Improvequantum dot concentrationVSAvoidfacility scale

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The invention utilizes liquid-liquid phase separation by adding salts to the aqueous solution, causing the solution to separate into two liquid phases with quantum dots concentrated in one phase. This phase transition approach replaces thermal evaporation, achieving concentration without requiring large-scale facilities or huge energy input.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The invention changes the chemical parameters of the solution by adding specific salts (quaternary ammonium salt and potassium salt) to induce phase separation. This parameter change approach enables quantum dot concentration through chemical means rather than physical evaporation, significantly reducing energy consumption.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If conventional evaporation methods are used, then quantum dots can be concentrated, but treatment cost increases due to energy consumption and facility requirements

Engineering Contradiction:

Improvequantum dot concentrationVSAvoidtreatment cost

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The invention utilizes liquid-liquid phase separation by adding salts to the aqueous solution, causing the solution to separate into two liquid phases with quantum dots concentrated in one phase. This phase transition approach replaces thermal evaporation, achieving concentration without requiring large-scale facilities or huge energy input.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The invention changes the chemical parameters of the solution by adding specific salts (quaternary ammonium salt and potassium salt) to induce phase separation. This parameter change approach enables quantum dot concentration through chemical means rather than physical evaporation, significantly reducing energy consumption.

Inventive Principle:

Principle #35Parameter changes

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

Enables simple and convenient concentration of quantum dots, reducing the volume of the aqueous solution and minimizing treatment costs.

Implementation Method 1

heating the dissolution liquid to separate the dissolution liquid into two phases, which are a quaternary ammonium salt phase containing a large amount of the quaternary ammonium salt and a potassium salt phase containing a large amount of the potassium salt

Methodology Applied

Scientific EffectPhase separation: Phase Change

Data Source

PatentUS12371615B2Method of treating quantum dot-containing aqueous solution

Publication Date: 2025.07.29 SHARP KK

AI summary

A method of treating an aqueous solution containing quantum dots, the method includes: a dissolution liquid preparation step of dissolving a quaternary ammonium salt and a potassium salt in an aqueous solution containing quantum dots to prepare a dissolution liquid; a phase separation step of heating the dissolution liquid to separate the dissolution liquid into two phases, which are a quaternary ammonium salt phase containing a large amount of the quaternary ammonium salt and a potassium salt phase containing a large amount of the potassium salt, and also to cause the quantum dots to be included in either one of the quaternary ammonium salt phase and the potassium salt phase; and a fractionation step of separating the quaternary ammonium salt phase and the potassium salt phase by fractionation.