High Concentration Aqueous Mixtures of Single Walled Nanotubes

2003 ◽  
Vol 772 ◽  
Author(s):  
Jaime C. Grunlan ◽  
Michael V. Bannon
Keyword(s):  
Electrical Conductivity ◽  
Polymer Matrix Composites ◽  
Gum Arabic ◽  
Single Walled Carbon Nanotubes ◽  
Matrix Composites ◽  
Aqueous Mixtures ◽  
High Concentration ◽  
Water Viscosity ◽  
Walled Carbon Nanotubes ◽  
Electrical Conductivity Data

AbstractGum arabic (GA) and polyvinylpyrrolidone (PVP) were used to stabilize relatively high concentration mixtures of single walled carbon nanotubes (SWNTs) in water. Viscosity and electrical conductivity data, along with electron microscopy, suggest that PVP interacts much more strongly with nanotubes than GA does. This strong PVP-SWNT relationship results in better dispersion of the nanotubes, resulting in lower electrical conductivity, but may enhance mechanical behavior in polymer-matrix composites.

Effects of the Mould Pressure and Mould Pressing Time on the Properties of Graphite/Phenolic Resin Composites

2013 ◽  
Vol 706-708 ◽  
pp. 95-98
Author(s):  
Mi Dan Li ◽  
Dong Mei Liu ◽  
Lu Lu Feng ◽  
Huan Niu ◽  
Yao Lu
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Flexural Strength ◽  
Polymer Matrix ◽  
Phenolic Resin ◽  
Polymer Matrix Composites ◽  
Resin Composites ◽  
Matrix Composites ◽  
Natural Graphite ◽  
Pressing Time

Polymer matrix composites made from phenolic resin are filled with natural graphite powders. They are fabricated by compression molding technique. The density, electrical conductivity and flexural strength of composite are analyzed to determine the influences of mould pressure and mould pressing time on the physical, electrical and mechanical properties of composite. It is found that the density, electrical conductivity and flexural strength of composites increased with increasing mould pressure. Under pressure of 40 MPa for 60 min, the density, electrical conductivity and flexural strength of composites were 1.85 g/cm3, 4.35  103 S/cm and 70 MPa, respectively. The decreased gaps could be the main reason for the increasing of density, electrical conductivity and flexural strength as mould pressure increases. The results also show that the density of composites increased with increasing mould pressing time.

scholarly journals Simple Method to Improve Electrical Conductivity of Films Made from Single-Walled Carbon Nanotubes

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1113 ◽  
Author(s):  
Bogumiła Kumanek ◽  
Tomasz Wasiak ◽  
Grzegorz Stando ◽  
Paweł Stando ◽  
Dariusz Łukowiec ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Single Walled Carbon Nanotubes ◽  
Simple Approach ◽  
Sonication Time ◽  
Free Standing ◽  
Simple Method ◽  
New Approach ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Despite the widespread use of sonication for individualization of nanomaterials, its destructive nature is rarely acknowledged. In this study, we demonstrated how exposure of the material to a hostile sound wave environment can be limited by the application of another preprocessing step. Single-walled carbon nanotubes (CNTs) were initially ground in a household coffee grinder, which enabled facile deagglomeration thereof. Such a simple approach enabled us to obtain high-quality CNT dispersion at reduced sonication time. Most importantly, electrical conductivity of free-standing films prepared from these dispersion was improved almost fourfold as compared with unground material eventually reaching 1067 ± 34 S/cm. This work presents a new approach as to how electrical properties of nanocarbon ensembles may be enhanced without the application of doping agents, the presence of which is often ephemeral.

Charge transfer complex-doped single-walled carbon nanotubes with reduced correlations between electrical conductivity and Seebeck coefficient for flexible thermoelectric generators

2020 ◽  
Vol 8 (14) ◽  
pp. 4827-4835 ◽  
Author(s):  
Jingjuan Tan ◽  
Hongfeng Huang ◽  
Dagang Wang ◽  
Shihui Qin ◽  
Xu Xiao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Charge Transfer ◽  
Seebeck Coefficient ◽  
Charge Transfer Complex ◽  
Single Walled Carbon Nanotubes ◽  
Charge Transfer Complexes ◽  
Thermoelectric Generators ◽  
Flexible Thermoelectric ◽  
Walled Carbon Nanotubes

Charge transfer complexes as far more superior dopants for carbon-based flexible thermoelectric generators.

Temperature-Dependent Thermal and Thermoelectric Properties of Single-Walled Carbon Nanotube Aerogels

2012 ◽  
Author(s):  
Kejia Zhang ◽  
Abhishek Yadav ◽  
Kyu Hun Kim ◽  
Youngseok Oh ◽  
Mohammad F. Islam ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Single Walled Carbon Nanotubes ◽  
Mechanical And Thermal Properties ◽  
Low Density ◽  
Temperature Dependent ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Critical Point Drying ◽  
Walled Carbon Nanotubes

Aerogels are ultraporous solids that have found a number of uses due to their very low density. Recently, aerogels based on single-walled carbon nanotubes (SWCNTs) have been fabricated and show significant potential for battery, supercapacitor, sensor, and thermal applications due to the electrical, mechanical, and thermal properties of SWCNTs as well as their capacity for functionalization. In this work we report temperature-dependent (100–300 K) measurements of thermal conductivity, electrical conductivity, and Seebeck coefficient for SWCNT aerogels synthesized through a critical point drying technique. Two types of aerogels are considered: an as-grown SWCNT aerogel and one that is coated with multiple graphitic layers (Gr-SWCNT) leading to significantly improved mechanical properties. Thermal conductivity and electrical conductivity were found to be significantly higher for SWCNT aerogels than for other aerogels, even though they have a much smaller density. Gr-SWCNT aerogels were found to have lower thermal conductivities than as-grown samples.

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