Morphology of Single-Wall Carbon Nanotube Aggregates Generated by Electrospray of Aqueous Suspensions

Details

• Personal Author:
  Ku BK ; Kulkarni P
• Description:
  Airborne single-wall carbon nanotubes (SWCNTs) have a high tendency to agglomerate due to strong interparticle attractive forces. The SWCNT agglomerates generally have complex morphologies with an intricate network of bundles of nanotubes and nanoropes, which limits their usefulness in many applications. It is thus desirable to produce SWCNT aerosol particles that have well-defined, unagglomerated fibrous morphologies. We present a method to generate unagglomerated, fibrous particles of SWCNT aerosols using capillary electrospray of aqueous suspensions. The effects of the operating parameters of capillary electrospray such as strength of buffer solution, capillary diameter, flow rate, and colloidal particle concentration on the size distributions of SWCNT aerosols were investigated. Results showed that electrospray from a suspension of higher nanotube concentration produced a bimodal distribution of SWCNT aerosols. Monodisperse SWCNT aerosols below 100 nm were mostly non-agglomerated single fibers, while polydisperse aerosols larger than 100 nm had two distinct morphologies: a ribbon shape and the long, straight fiber. Possible mechanisms are suggested to explain the formation of the different shapes, which could be used to produce SWCNT aerosols with different morphologies. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Occupational Health Particulate Matter Safety
• Keywords:
  Aerosol-particles Agglomeration Airborne-particles Analytical-processes Author Keywords: Single-wall Carbon Nanotubes Electrosprays Fibrous-bodies Fibrous-dusts Morpholines Morphology Nanotechnology Particle-aerodynamics Particulate-dust Particulates Straight Fiber SWCNTs Water Suspensions

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• ISSN:
  1388-0764
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  11
• Issue:
  6
• NIOSHTIC Number:
  nn:20035779
• Citation:
  J Nanopart Res 2009 Aug; 11(6):1393-1403
• Contact Point Address:
  Bon Ki Ku, Centers for Disease Control and Prevention (CDC), National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Parkway, MS-R3, Cincinnati, OH 45226
• Email:
  BKu@cdc.gov
• Federal Fiscal Year:
  2009
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Nanoparticle Research
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:94660206b1757b7500f5e03c7040920637f05e5056a1c1c66c2b2d10c5ad15a5ba98b541729da8884ea9982a3b903793388bbce557251d82298dcd69e53defb6
• Download URL:
  https://stacks.cdc.gov/view/cdc/187509/cdc_187509_DS1.pdf
• File Type:
  [PDF - 683.25 KB ]