Small-angle scattering, contrast variation and the study of complex composite materials: A study of the structure of carbon black

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Detailed studies are presented on the structure and aggregation of an experimental high surface area carbon black (HSA) using small-angle neutron scattering and the method of contrast variation. We find that the approximately 27 mn HSA particle form small, linear aggregates of average aggregation number 5 when suspended in cyclohexane. There is considerable density fluctuation in the interior of these particles, with the denser regions being toward the outer part of the spherically-averaged structure. This information would not have been obtained from studies of carbon black without solvent. The results will be applied to similar scattering studies on solvent-swollen bound ... continued below

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Pages: (19 p)

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Hjelm, R.P. Jr.; Seeger, P.A. (Los Alamos National Lab., NM (United States)) & Wampler, W.A. (Sid Richardson Carbon Co., Fort Worth, TX (United States)) January 1, 1993.

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Description

Detailed studies are presented on the structure and aggregation of an experimental high surface area carbon black (HSA) using small-angle neutron scattering and the method of contrast variation. We find that the approximately 27 mn HSA particle form small, linear aggregates of average aggregation number 5 when suspended in cyclohexane. There is considerable density fluctuation in the interior of these particles, with the denser regions being toward the outer part of the spherically-averaged structure. This information would not have been obtained from studies of carbon black without solvent. The results will be applied to similar scattering studies on solvent-swollen bound rubber gels made from HSA-polyisoprene. These result show, however, that the strong internal fluctuations of the carbon black will limit the information that can be obtained on the structure and conformation of the elastomer in the gel. There are additional limitation from compositional heterogeneity of the sample.

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Pages: (19 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • American Chemical Society meeting on rubber chemistry and technology, Denver, CO (United States), 18-22 May 1993

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  • Other: DE93012707
  • Report No.: LA-UR-93-1657
  • Report No.: CONF-9305185--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6488519
  • Archival Resource Key: ark:/67531/metadc1204080

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  • January 1, 1993

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  • July 5, 2018, 11:11 p.m.

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  • Aug. 7, 2018, 4:38 p.m.

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Hjelm, R.P. Jr.; Seeger, P.A. (Los Alamos National Lab., NM (United States)) & Wampler, W.A. (Sid Richardson Carbon Co., Fort Worth, TX (United States)). Small-angle scattering, contrast variation and the study of complex composite materials: A study of the structure of carbon black, article, January 1, 1993; United States. (digital.library.unt.edu/ark:/67531/metadc1204080/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.