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Keywords = Cr hexacarbonyl

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18 pages, 9618 KiB  
Article
The WC and CrC Coatings Deposited from Carbonyls Using PE CVD Method—Structure and Properties
by Marianna Trebuňová, Daniel Kottfer, Karol Kyziol, Mária Kaňuchová, Dávid Medveď, Róbert Džunda, Marta Kianicová, Lukáš Rusinko, Alena Breznická and Mária Csatáryová
Materials 2023, 16(14), 5044; https://doi.org/10.3390/ma16145044 - 17 Jul 2023
Cited by 5 | Viewed by 1547
Abstract
This article presents a comparative study of WC and CrC coatings deposited by the plasma-enhanced chemical vapor method using the hexacarbonyls of W and Cr as precursors. The measured thicknesses of the WC and CrC coatings are equal to ca. 1.5 µm. The [...] Read more.
This article presents a comparative study of WC and CrC coatings deposited by the plasma-enhanced chemical vapor method using the hexacarbonyls of W and Cr as precursors. The measured thicknesses of the WC and CrC coatings are equal to ca. 1.5 µm. The WC coating consists of microcolumns with a conical end, with gaps between the microcolumns up to approximately 100 nm, and their structure is formed by nanoparticles in the shape of globules with a diameter of up to 10 nm. In the case of the CrC coating, a cauliflower structure with gaps ranging from 20 to 100 nm was achieved. The diameter of cauliflower grains is from 50 nm to 300 nm. The C content in the WC and CrC coating is 66.5 at.% and 75.5 at.%. The W content is 1.4 at.% and the Cr content in the CrC coating is 1.2 at.%. The hardness and Young’s modulus of the WC coating are equal to 9.2 ± 1.2 GPa 440.2 ± 14.2 GPa, respectively. The coefficients of friction and wear volume of the WC coating are equal to 0.7 and −1.6 × 106/+3.3 × 106 µm3, respectively. The hardness and Young’s modulus of the CrC coating are 7.5 ± 1.2 GPa and 280 ± 18.5 GPa, respectively. The coefficients of friction and wear volume of the CrC coating are 0.72 and −18.84 × 106/+0.35 × 106 µm3, respectively. Full article
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13 pages, 4300 KiB  
Article
Determination of 2-Acetyl-1-pyrroline via a Color-Change Reaction Using Chromium Hexacarbonyl
by Chonlada Bennett, Woraprapa Sriyotai, Sirakorn Wiratchan, Natthawat Semakul and Sugunya Mahatheeranont
Molecules 2022, 27(12), 3957; https://doi.org/10.3390/molecules27123957 - 20 Jun 2022
Cited by 5 | Viewed by 3713
Abstract
At present, there is no colorimetric method for the quantitation of the aroma compound 2-acetyl-1-pyrroline (2AP). A novel colorimetric method was developed for the determination of 2AP content using chromium hexacarbonyl (Cr(CO)6) as a reagent. The reaction of synthetic 2AP with [...] Read more.
At present, there is no colorimetric method for the quantitation of the aroma compound 2-acetyl-1-pyrroline (2AP). A novel colorimetric method was developed for the determination of 2AP content using chromium hexacarbonyl (Cr(CO)6) as a reagent. The reaction of synthetic 2AP with chromium hexacarbonyl reagent solution in the presence of light produced a green product with an absorption maximum (λmax) at 623 nm. GC–MS was used to confirm the color-change reaction, which showed the loss of 2AP after the addition of Cr(CO)6. This novel method enables facile and cost-effective determination of 2AP in fragrant rice. A comparative analysis of fragrant and nonfragrant rice grain extracts showed that no color-change reaction occurred with the nonfragrant rice sample. A limit of detection (LOD) of 2.00 mg L−1 was determined by method validation with an effective linear concentration ranging from 5.00 to 60.00 mg L−1 of 2AP. The results obtained using the developed colorimetric method were consistent with those obtained by automated static headspace gas chromatography with nitrogen-phosphorus detection (SHS-GC–NPD). Full article
(This article belongs to the Special Issue Analysis of Volatile and Odor Compounds in Foods—Second Edition)
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