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X-ray powder diffraction data for selected metal soaps

  • Marie-Claude Corbeil (a1) and Laurianne Robinet (a2)

In order to better characterize metal soaps found in paint films or on metal surfaces, several metal soaps were synthesized and their X-ray powder diffraction patterns measured. Metal soaps were obtained from four different fatty acids found in drying oils, two saturated (palmitic and stearic acids) and two unsaturated (oleic and linoleic acids), and from copper, zinc, and lead, three metals that are typically found in metal alloys and paint systems. X-ray powder diffraction data are reported for the following compounds: palmitic acid, stearic acid, zinc palmitate, zinc stearate, zinc oleate, zinc linoleate, copper palmitate, copper stearate, copper oleate, lead palmitate, lead stearate, and lead oleate. Features that are characteristic of specific compounds were observed. Soaps obtained from different fatty acids with the same metal ion show differences, as do soaps obtained with the same fatty acid but with different metal ions. Differences were observed when X-ray powder diffraction data obtained for stearic acid and zinc stearate were compared to published data for these two compounds (PDF 38-1923 and 5-0079, respectively). In the case of stearic acid, differences could be explained by the fact that the specimen reported previously in PDF 38-1923 was likely contaminated with palmitic acid. In the case of zinc stearate, low angle data were missing from the original pattern PDF 5-0079 and peaks that were reported in other angular regions in fact consisted in more peaks that were not resolved due to broadening.

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P. Tandon , G. Förster , R. Neubert , and S. Wartewig (2000). “Phase transitions in oleic acid by X-ray diffraction and FT-Raman spectroscopy,” J. Mol. Struct. JMOSB4 524, 201215. jmb, JMOSB4 0022-2860

A. E. Koenig (1914). “On the stearates and palmitates of the heavy metals with remarks concerning instantaneous precipitations in insulating solutions,” J. Am. Chem. Soc. JACSAT 36, 951961. acs, JACSAT 0002-7863

J. N. van Niekerk , and F. R. L. Schoening (1953). “A new type of copper complex as found in the crystal structure of cupric acetate, Cu2(CH3COO)4·2H2O,Acta Crystallogr. ACCRA9 6, 227232. acc, ACCRA9 0365-110X

T. Tachibana , K. Kayama , and H. Takeno (1972). “Studies of helical aggregates of molecules. III. The bivalent metal soaps of optically active 12-hydroxyoctadecanoic acid,” Bull. Chem. Soc. Jpn. BCSJA8 45, 415422. bcs, BCSJA8 0009-2673

D. Tilbrooke (1980). “The fatty acid corrosion of copper alloys and its treatment,” ICCM Bull. ZZZZZZ 6, 4652.

E. W. J. Michell , and K. Y. Ng (1982). “X-ray powder diffraction studies of basic lead carbonate as a stabilizer in plasticized polyvinyl chloride,” J. Chem. Technol. Biotechnol. JCTBED 32, 382392. 375, JCTBED 0268-2575

I. Horovitz (1986). “Paintings on copper supports: Techniques, deterioration and conservation,” The Conservator ZZZZZZ 10, 4448.

D. P. Stommen , A.-M. Giroud-Godquin , P. Maldivi , J.-C. Marchon , and B. Marchon (1987). “Vibrational studies of some dicopper tetracarboxylates which exhibit a thermotropic columnar mesophase,” Liq. Cryst. LICRE6 2, 689699. lic, LICRE6 0267-8292

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Powder Diffraction
  • ISSN: 0885-7156
  • EISSN: 1945-7413
  • URL: /core/journals/powder-diffraction
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