The XRD pattern of Zinc oxide and zinc oxide in acrylic acid

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Discussion Overview

The discussion revolves around the X-ray diffraction (XRD) patterns of zinc oxide (ZnO) and ZnO dispersed in acrylic acid and is focused on the differences observed in the XRD results. Participants explore the implications of these findings in terms of crystallinity and potential chemical interactions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant reports specific XRD peaks for pure zinc oxide and notes significantly different peaks for ZnO in acrylic acid/IPA, questioning whether this indicates a change or destruction of the crystalline structure.
  • Another participant raises concerns about the polymerization of acrylic acid, suggesting that the formation of poly-acrylic acid could contribute to the additional peaks observed in the XRD analysis.
  • A third participant describes their experimental setup, indicating that they did not observe any peaks for ZnO after polymerization, which they find puzzling.
  • A later reply proposes the possibility of forming an acrylic/zinc soap during the polymerization process and inquires about the physical state of the product (gel or solid precipitate) and the fate of the zinc component in the IPA.

Areas of Agreement / Disagreement

Participants express differing views on the reasons for the observed changes in XRD patterns, with no consensus on the underlying causes or the implications of the findings. Multiple competing hypotheses remain under discussion.

Contextual Notes

Limitations include potential missing assumptions regarding the purity of the acrylic acid/IPA mixture and the specifics of the polymerization process, which may affect the interpretation of the XRD results.

justinlee
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the XRD pattern of Zinc oxide and zinc oxide in acrylic acid !

I did XRD analysis of zinc oxide, and its peaks are at 31.7, 34.4, 36.2, 47.5, 56.6, 62.9 and 67.9 (2-theta degree).

further, I did XRD of zinc oxide dispersed in acrylic acid/IPA. but it's weird ! Why I could got some peaks at 21.6, 27.2, 32.7, 38.4, 44.1, 50.0, 62.1 and 68.5 (2-theta degree), but these peaks are totally different from the peaks of pure zinc oxide ??!

Is it cause of the crystalline has been changed or destroyed ?

thanks for your teaching !
 
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Two big concerns with the medium:

1. Acrylic acid polymerizes pretty easily upon radiation. I would hardly be surprised if you've now got significant amounts of poly-acrylic acid in the medium, which may be producing the extra peaks.

2. What are the purity levels of AA/IPA?
 
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I dispersed ZnO particles in AA/IPA mixture which is 50:50 ratio.

And, I add 0.1g ZnO into 1g AA and 5g IPA, then did polymerization; but i could get the apparent peaks of ZnO particles in XRD analysis (there is no any peak )! that's weird !
 
Could you have formed an acrylic/zinc soap? When you polymerized the AA did you form a gel or did a solid ppt? If you are isolating a ppt, perhaps the zinc component remains in the IPA?