CNT Growth Furnace with Segmented Insulation and Visual Window

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Solution Overview

Problem

Current CNT growth technologies face challenges in scalability and visualization due to large instrument sizes, high costs, and the inability to monitor CNT growth in situ, limiting the production of high-quality, aligned carbon nanotubes with predictable coverage and chirality.

Innovation Solution

A compact CNT growth furnace with an integrated gas heater and substrate heater within the insulation, featuring a transparent window for visual monitoring and a PID controller for precise temperature control, allowing for efficient growth and observation of CNTs on a substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a large instrument with insulation is used for CNT growth, then temperature control is improved, but the ability to monitor CNT growth in situ deteriorates

Engineering Contradiction:

Improvetemperature controlVSAvoidmonitoring capability

Core Design Contradiction:

TemperatureVSDifficulty of detecting and measuring

Solution Approach 1:

The instrument is divided into distinct functional zones: a heating zone with insulation for temperature control and a transparent observation zone for monitoring. The observation zone allows visual monitoring while the heating zone maintains controlled temperature conditions, resolving the contradiction between insulation and transparency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the instrument have different properties: the heating zone has insulation for thermal control, while the observation zone has transparent materials for monitoring. This local differentiation allows both temperature control and monitoring capabilities to coexist in the same instrument.

Inventive Principle:

Principle #3Local quality

2Power

If a separate gas heater is used, then heating function is improved, but heat loss increases and footprint increases

Engineering Contradiction:

Improveheating functionVSAvoidheat loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The gas heater is integrated directly into the reaction chamber structure, merging the heating function with the reaction zone. This eliminates the need for separate heating components and reduces heat loss by minimizing the distance between the heat source and the substrate, while also reducing the overall instrument footprint.

Inventive Principle:

Principle #5Merging (Combining)

3Power

If a separate gas heater is used, then heating function is improved, but device footprint increases

Engineering Contradiction:

Improveheating functionVSAvoidfootprint

Core Design Contradiction:

PowerVSArea of stationary object

Solution Approach 1:

The gas heater is merged with the reaction chamber structure, eliminating separate heating components. This integration significantly reduces the instrument's footprint while maintaining effective heating function, making the instrument more compact and suitable for smaller laboratories.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If thin elongated substrates are used, then they can be held in narrow tube reaction chamber, but substrate area is limited

Engineering Contradiction:

Improvesubstrate compatibilityVSAvoidsubstrate area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The reaction chamber is designed with a wide opening that allows insertion of substrates with larger surface areas. The chamber geometry is segmented to accommodate both thin elongated substrates and larger substrates, providing versatility in substrate types while maximizing the usable substrate area for CNT growth.

Inventive Principle:

Principle #1Segmentation

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 the production of high-quality CNTs with improved scalability and cost-effectiveness, enabling visual monitoring of growth processes and accommodating larger substrates, thus overcoming the limitations of existing technologies.

Implementation Method 1

a gas heater including a plurality of heat pipes configured to be inserted in the plurality of heat pipe passages

Methodology Applied

Scientific EffectHeat pipe: Heat Pipe

Implementation Method 2

a substrate heater incorporated in the second stage of the insulation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

insulation extending through a portion of an interior of the body, the insulation including a first stage and a second stage

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS11578405B2Apparatus for monitoring carbon nanotube growth

Publication Date: 2023.02.14 KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

AI summary

A carbon nanotube (CNT) growth apparatus includes: a body; an inlet cap; an outlet cap; insulation extending through a portion of an interior of the body, the insulation including a first stage and a second stage, a flow tube extending through the inlet cap and passing coaxially through the first stage of the insulation, the flow tube configured to receive and flow a fluid to the interior of the body; a gas heater including a plurality of heat pipes configured to be inserted in the first stage of the insulation, the plurality of heat pipes being disposed adjacent to the flow tube; a substrate heater incorporated in the second stage of the insulation; and a temperature controller configured to adjust a temperature of the gas heater and substrate heater, wherein a removed portion of the second stage is configured to provide an unobstructed view of the substrate.