Accession Number : ADA600900


Title :   Reversible Tailoring of Mechanical Properties of Carbon Nanotube Forests by Immersing in Solvents


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE


Personal Author(s) : Abadi, Parisa P ; Maschmann, Matthew R ; Mortuza, S M ; Banerjee, Soumik ; Baur, Jeffery W ; Graham, Samuel ; Cola, Baratunde A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a600900.pdf


Report Date : 07 Dec 2014


Pagination or Media Count : 11


Abstract : The mechanical behavior of carbon nanotube (CNT) forests soaked in three solvents toluene, acetonitrile, and isopropanol is examined. Effective stiffness of the structure is evaluated in the dry and wet condition by micro-indentation using a 100 lm flat punch. With soaking of CNT forests in solvents, the stiffness decreases and deformation mechanism changes from buckling concentrated close to the bottom of the CNT forest to a distribution of local buckles along the height and global buckling of the entire length of CNTs. We use molecular dynamics simulations to relate the experimental observations to the reduced mechanical support from neighbor CNTs due to a decreased magnitude of van derWaals (vdW) interactions in the presence of solvents. Toluene, which produces the lowest average measured stiffness between the three solvents, produces the lowest vdW forces between individual CNTs. Furthermore, wet-dry cycling of CNT forests shows the reversibility and repeatability of change of stiffness by immersing in solvents. The results show that soaking CNT forests in solvents could be useful for applications such as interface materials where lower stiffness of CNT forests are needed and applications such as energy absorbing materials in which re-setting of stiffness is required.


Descriptors :   *CARBON NANOTUBES , *MECHANICAL PROPERTIES , *MOLECULAR DYNAMICS , *SOLVENTS , ACETONITRILE , BUCKLING , DEFORMATION , INFILTRATION(FLUIDS) , PROPANOLS , REVERSIBLE , STIFFNESS , STRESS STRAIN RELATIONS , TOLUENES , VAN DER WAALS FORCES


Subject Categories : Refractory Fibers
      Solvents, Cleaners, and Abrasives
      Atomic and Molecular Physics and Spectroscopy
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE