Mechanical and Thermal Management Characteristics of Ultrahigh Surface Area Single‐Walled Carbon Nanotube Aerogels

Abstract

Lightweight aerogels with large specific surface area (SSA) have numerous applications. Free‐standing aerogels are created from single‐walled carbon nanotubes (SWCNTs), and their SSA and pore characteristics, electrical conductivity, mechanical properties, and thermal management attributes are determined. The SSA of the aerogels is extraordinarily high and approaches 1291 m2 g−1 at a density of 7.3 mg mL−1, which is close to the theoretical limit (≈1315 m2 g−1). Mechanical characterization shows that these aerogels have open‐cell structures and their Young's moduli are higher than other aerogels at comparable density. The aerogels also enhance heat transfer in a forced convective process by ≈85%, presumably due to their large porosity and surface area.

Self-Expansion Construction of Ultralight Carbon Nanotube Aerogels with a 3D and Hierarchical Cellular Structure

“…The isothermal adsorption–desorption curves of the CNT aerogel measured by the Brunauer–Emmett–Teller (BET) method showed a typical microporous structure of the cell walls, and demonstrated a high specific surface area of 298 m 2 g −1 (Figure b). The specific surface area of a pristine CNT film was only about 180 m 2 g −1 (Figure S2, Supporting Information), which was at the same level with those of multiwalled CNTs reported in the literature and almost one magnitude lower than those of single‐walled CNT aerogels . By performing the piranha solution treatment, the CNT aerogel obtained higher specific surface area than the pristine CNT film.…”

Assembly of silica aerogels within silica nanofibers: towards a super-insulating flexible hybrid aerogel membrane

“…33,34 No excessive nitrogen uptake is noted when P/P 0 < 0.05, indicating that the samples do not contain micropores (pore diameter < 2 nm). 35 Pore-size distribution calculated by Barrett-Joyner-Halenda (BJH) method from the desorption branch (Fig. 4b) further convinced that the hybrid SNF/SA membranes exhibited a broad range in meso-and macropore size regions (2-70 nm) with small average pore width (<8.6 nm) and a high pore volume of 1.935 cm 3 g À1 , which is consistent with the aerogel nature.…”

Industrially benign super-compressible piezoresistive carbon foams with predefined wetting properties: from environmental to electrical applications

“…between 5% and 20% compressive deformation) are Y P,600 = 1.5 ± 0.1 kPa, Y P,700 = 9.6 ± 1.4 kPa, Y P,800 = 24.7 ± 1.5 kPa and Y P+A,800 = 46.3 ± 2.0 kPa, respectively. The stress-strain curves exhibit a plateau between 20% and 40% strain and then show a gradually increasing steep slope above compression of ~40% - similar to those of other compressible foams and sponge-like materials36373839 – caused by the densification of the structures404142. Despite the very low strain rates applied (<0.1%/s) the stress-strain curves have considerable hysteresis indicating processes associated with energy losses (0.69 ± 0.07), e.g.…”