Metallic Nanoparticle Composition for Clog-Resistant Line Dispensing

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Solution Overview

Problem

Metallic nanoparticle compositions frequently clog capillary tubes in printing apparatuses, leading to inconsistent line widths due to pressure-induced protrusion of the composition at the outlet, necessitating frequent tube replacement and non-uniform line formation.

Innovation Solution

A metallic nanoparticle composition comprising silver or copper nanoparticles stabilized with PVP, using non-aqueous polar protic solvents like triethylene or tetraethylene glycol with high boiling points and controlled viscosities, along with a method involving a piston-cylinder assembly and regulated pneumatic system to extrude the composition, reducing clogging and ensuring uniform line widths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pressure is applied to prevent clogging by maintaining protrusion of metallic nanoparticle composition at the outlet end of the capillary tube, then clogging is reduced, but line width uniformity deteriorates due to variable protrusion affecting first portion of the line

Engineering Contradiction:

Improveclogging resistanceVSAvoidline width uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent changes the chemical composition parameters of the solvent system, specifically using a non-aqueous polar solvent with controlled viscosity (45-65 cP at 20°C) and high boiling point (≥280°C), along with specific metal salt concentrations (60-90 wt%), to achieve a composition that flows consistently through the capillary tube without clogging while maintaining uniform line width, eliminating the need for pressure-induced protrusion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces specific additives including polyvinylpyrrolidone (PVP) and other surfactants as intermediary substances that modify the interfacial properties between the metallic nanoparticle composition and the capillary tube wall, reducing adhesion and friction to prevent clogging while maintaining stable flow characteristics for uniform line deposition

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If capillary tubes are used to dispense metallic nanoparticle composition, then precise line formation is achieved, but frequent clogging necessitates frequent tube replacement

Engineering Contradiction:

Improveline width controlVSAvoidtube replacement frequency

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent modifies the rheological parameters of the metallic nanoparticle composition by controlling solvent viscosity (45-65 cP) and metal salt concentration (60-90 wt%), enabling the composition to flow smoothly through the capillary tube without aggregating or clogging, thereby extending tube lifespan while maintaining precise line formation capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs surfactants and PVP as intermediary agents that coat the capillary tube inner surface and the nanoparticle surfaces, creating a lubricating interface that prevents direct adhesion between the composition and tube wall, thus eliminating clogging while preserving the tube's precise dispensing function

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If high concentration of metallic nanoparticles (60-90 wt%) is used, then material efficiency is improved, but composition stability and flow consistency deteriorate

Engineering Contradiction:

Improvemetallic nanoparticle concentrationVSAvoidflow consistency

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent creates a composite solvent system combining non-aqueous polar solvents with specific viscosity characteristics (45-65 cP) and high boiling points (≥280°C), along with PVP and other surfactants, that can stabilize high concentrations of metallic nanoparticles (60-90 wt%) by providing steric and electrostatic repulsion, preventing aggregation while maintaining flow consistency through the capillary tube

Inventive Principle:

Principle #40Composite materials

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 solution significantly reduces capillary tube clogging and achieves more uniform line widths by maintaining consistent dispensing pressures, extending tube lifespan and improving printing precision.

Implementation Method 1

extruding the metallic nanoparticle composition through the capillary tube under actuation by the regulated pneumatic system

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS12577423B2Metallic nanoparticle composition and method of dispensing metallic nanoparticle composition

Publication Date: 2026.03.17 XTPL SA

AI summary

A metallic nanoparticle composition includes metallic nanoparticles and a non-aqueous polar protic solvent. The non-aqueous polar protic solvent has two hydroxyl groups, a boiling point of at least 280° C. at 760 mm Hg, and a viscosity in a range of 45 cP to 65 cP at 20° C. Polyvinylpyrrolidone (PVP) is present on the metallic nanoparticle surfaces. A concentration of metals in the metallic nanoparticle composition is in a range of 60 wt % to 90 wt % and a concentration, in aggregate, of solvents having a boiling point of less than 280° C. at 760 mm Hg in the metallic nanoparticle composition does not exceed 3 wt %.