Errors in Thermogravimetric Experiments Resulting from Adsorption on the Counterweight

  • E. Robens


The sorption behaviour of quartz, glass, aluminum, gold and PTFE was examined with respect to their use as counterweight materials. Using nitrogen, krypton, water, alcohol and neopentane, reversible S-shaped isotherms were observed with a monolayer cover at a relative pressure of about 0.1, and up to eight layers at the saturation pressure. When organic vapours are used chemisorption may occur. Near the saturation pressure condensation effects on porous surfaces and contaminations have to be taken into account.


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  1. (1).
    A.W. Czanderna, (ed.): Microweighing in Vacuum and Con-trolled Environments; Part I: Beam Balances; Amsterdam: Elsevier 1980Google Scholar
  2. (2).
    E. Robens; Wägen und Dosieren, (1980) in printGoogle Scholar
  3. (3).
    E. Robens, G. Walter, Thermochimica Acta 9 (1974) 23–28CrossRefGoogle Scholar
  4. (4).
    G. Korányi: Surface Properties of Silicate Glasses; Budapest: Akadémici Kiado 1963; p. 29 ff.Google Scholar
  5. (5).
    N. Hackerman, A.C. Hall; J.Phys.Chem. 62 (1958) 1212–1216CrossRefGoogle Scholar
  6. (6).
    R.I. Razouk, A.S. Salem; J.Phys.Chem. 52 (1948) 1208–1227CrossRefGoogle Scholar
  7. (7).
    R.B. Perry, K.H. Svatek; J. Colloid Interface Sci. 68. (1979) No. 2, 393–395CrossRefGoogle Scholar
  8. (8).
    J.W. Whalen, W.H. Wade, J.J. Porter; J. Colloid Interface Sci. 24 (1967) No. 3, 379–383CrossRefGoogle Scholar

Copyright information

© Springer Basel AG 1980

Authors and Affiliations

  • E. Robens
    • 1
  1. 1.Battelle-Institut e.V.Frankfurt am MainGermany

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