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Träfflista för sökning "LAR1:ltu srt2:(2000-2009);srt2:(2003)"

Search: LAR1:ltu > (2000-2009) > (2003)

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  • Abrahamsson, Lena (author)
  • When it became important, it suddenly turned male
  • 2003
  • In: Where have all the structures gone?. - Stockholm : Center for Womens Studies [Centrum för kvinnoforskning vid Stockholms universitet]. - 918779232X ; , s. 253-284
  • Book chapter (other academic/artistic)
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  • Agarwal, Parminder, et al. (author)
  • In situ monitoring of calcium carbonate polymorphs during batch crystallization in the presence of polymeric additives using Raman spectroscopy
  • 2003
  • In: Crystal Growth & Design. - : American Chemical Society (ACS). - 1528-7483 .- 1528-7505. ; 3:6, s. 941-946
  • Journal article (peer-reviewed)abstract
    • Polycarboxylic acids are well-known to affect calcium carbonate crystallization. Agarwal et al. (Ind. Eng. Chem. Res. 2003, in press) reported previously the synthesis of polymaleimide by a variety of techniques and initiators. In the present work, the effect of these polymers on calcium carbonate crystallization was studied by a variety of techniques. Crystallization experiments were carried out in a 1-L LABMAX automated batch reactor, and the concentration of calcium in solution was determined in real time. Raman spectroscopy was used to determine the relative amount of various calcium carbonate polymorphs as the crystallization occurred. However, Raman spectroscopy is a scattering technique, which may make it surface selective, and therefore results from solids may not be representative of bulk of sample. X-ray diffraction (XRD) was used to compare the results obtained by Raman spectroscopy. Peak intensity ratios were used for both Raman spectroscopy and XRD for calibration and measurement purposes. The results obtained by these two techniques for final percent vaterite for calcium carbonate crystallization in the presence of polymeric additives were in agreement within 2%. Therefore, use of Raman spectroscopy for in situ measurement of polymorph composition during calcium carbonate crystallization appears accurate. Scanning electron microscopy (SEM) data were useful in understanding the crystal morphology and to determine crystal size.
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