As demand continues to grow across lithium-ion batteries, conductive coatings, electromagnetic interference (EMI) shielding materials, and engineering polymer composites, carbon nanotubes (CNTs) are increasingly transitioning from laboratory research to large-scale industrial applications. Among them, single-walled carbon nanotubes (SWCNTs) are widely recognized as one of the most promising conductive nanomaterials due to their exceptional electrical conductivity and ultra-high aspect ratio, making them highly effective for constructing efficient conductive networks.

However, challenges related to CNT dispersion, storage stability, and rheological control remain significant barriers to broader industrial adoption. In recent years, oil-based CNT dispersions have attracted growing attention from downstream manufacturers, while research into dispersion mechanisms, interface engineering, and additive optimization continues to advance.

Why Is Carbon Nanotube Dispersion So Challenging?

CNTs possess highly conjugated sp²-hybridized carbon structures, which contribute to their outstanding electrical properties. At the same time, these structures generate strong van der Waals attractions between nanotubes, causing them to naturally aggregate into bundles.

From a materials engineering perspective, the goal of CNT dispersion extends beyond simply breaking apart agglomerates. The real challenge lies in maintaining long-term dispersion stability and preventing re-aggregation after processing.

Industry studies generally agree that a stable CNT dispersion system requires three key factors:

• Effective initial wetting of the nanotube surface;
• Sufficient mechanical dispersion energy;
• A durable stabilization mechanism at the interface.

Only when these three elements work together can a homogeneous and stable conductive network be achieved.

Water-Based and Oil-Based Systems: Two Distinct Technical Routes

Commercial CNT dispersions are typically categorized into water-based and oil-based (solvent-based) systems.

The most fundamental difference lies in the dispersion medium itself.

Publicly available data indicate that the surface tension of water is approximately 72.8 mN/m at 20°C, while common organic solvents such as ethanol, acetone, and toluene generally range between 20 and 35 mN/m. Lower surface tension enables organic solvents to wet CNT surfaces more effectively, reducing the energy barrier for dispersion.

As a result, oil-based systems often demonstrate superior dispersion efficiency when dealing with hydrophobic materials.

Characteristics of Water-Based Systems

Water-based CNT dispersions typically rely on:

• Electrostatic repulsion;
• Surfactant-assisted stabilization;
• Partial steric hindrance effects.

Their primary advantage is environmental friendliness, making them suitable for certain aqueous battery formulations and eco-friendly coating systems.

However, these systems are often sensitive to pH, ionic strength, and environmental conditions, which can negatively affect long-term stability and lead to sedimentation or phase separation.

Characteristics of Oil-Based Systems

Oil-based systems commonly use N-Methyl-2-pyrrolidone (NMP), alcohols, or aromatic solvents as the continuous phase.

Because these solvents generally have lower dielectric constants than water, electrostatic stabilization becomes less effective. Consequently, dispersion stability relies more heavily on polymeric dispersants that create steric barriers around CNTs.

Industry experts note that oil-based CNT dispersions often exhibit superior compatibility and film-forming performance in epoxy, polyurethane (PU), and acrylic resin systems commonly used in industrial coatings.

Growing Interest in the Role of 2-Amino-2-Methyl-1-Propanol

As formulation technologies continue to evolve, increasing attention is being paid to amino alcohol additives in oil-based CNT systems.

Among them, 2-Amino-2-Methyl-1-Propanol, a multifunctional molecule containing both amino and hydroxyl functional groups, has been widely used in coatings, water treatment, metalworking fluids, and specialty materials.

In oil-based CNT dispersions, 2-Amino-2-Methyl-1-Propanol offers several potential benefits:

1. Interface Optimization

CNT surfaces often contain trace amounts of oxygen-containing functional groups such as carboxyl and hydroxyl groups.

The amino and hydroxyl functionalities of 2-Amino-2-Methyl-1-Propanol can interact with these active sites, helping improve interfacial compatibility between CNTs and the surrounding organic medium.

Researchers suggest that such interactions may enhance dispersant adsorption and improve resistance to re-agglomeration.

2. Rheology Improvement

As CNT loading increases, dispersion viscosity can rise dramatically due to the formation of interconnected nanotube networks.

Appropriate incorporation of polarity-modifying additives may help reduce nanotube entanglement, resulting in improved flowability and processing performance.

This benefit becomes particularly important in the development of high-solid-content formulations.

3. Enhanced Storage Stability

During long-term storage, solvent systems may experience performance drift due to trace moisture, acidic impurities, or degradation products from resin components.

2-Amino-2-Methyl-1-Propanol can provide pH buffering and acid-neutralizing capabilities, helping maintain a more stable chemical environment and reducing the risk of gelation and sedimentation.

 

Expanding Demand Across Energy and Advanced Materials Industries

Recent market developments indicate strong growth in CNT applications across several sectors.

Lithium-Ion Battery Conductive Additives

As battery manufacturers pursue higher energy density, CNTs are increasingly being used to partially replace traditional conductive carbons, enabling more efficient conductive networks at lower additive loadings.

EMI Shielding Materials

The rapid expansion of 5G infrastructure, electric vehicles, and AI data centers has intensified demand for advanced EMI shielding solutions, driving growth in CNT-based conductive coatings.

Antistatic Coatings

Industries such as semiconductors, electronics manufacturing, and precision packaging continue to seek low-loading conductive solutions capable of delivering stable antistatic performance.

Engineering Plastic Composites

Demand for conductive and lightweight engineering plastics—including ABS, PC, and PA materials—is creating new opportunities for CNT-based composite technologies.

Industry Trend: From Dispersion to Precision Engineering

Industry observers increasingly believe that the next stage of competition in CNT dispersion technology will extend beyond simply achieving dispersion.

Future development priorities are expected to focus on:

• Longer storage life;
• Higher solid content;
• Lower viscosity;
• More stable conductive networks;
• Improved compatibility with downstream applications.

Within this context, the synergistic design of dispersants, interface modifiers, and functional additives is becoming a critical area of innovation.

For oil-based CNT dispersions, the use of multifunctional additives such as 2-Amino-2-Methyl-1-Propanol to optimize interfacial interactions, improve storage stability, and enhance processing performance is emerging as an important technical direction across the value chain.

 

Looking Ahead

As the new energy, advanced materials, and high-end manufacturing sectors continue to expand, CNT dispersion technology is evolving from a sole focus on conductivity toward a more comprehensive emphasis on stability, processability, and industrial adaptability.

From selecting the appropriate dispersion medium to engineering interfacial chemistry, from rheology control to long-term storage management, every aspect of formulation development directly impacts end-use performance.

Looking forward, continued research into the synergistic application of oil-based CNT dispersions and functional additives such as 2-Amino-2-Methyl-1-Propanol may unlock new opportunities for innovation across the conductive materials industry.