3 items

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  Surface functional groups and degree of carbonization of selected chars from different processes and feedstock cite

  Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)

  The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...

  Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS

  ... adequate results. The combination of X-ray photoelectron spectroscopy (XPS) and FT-IR spectroscopy allows a rough characterization of surface functional groups, but cannolt discriminate aliphatic and aromatic OH groups. FT-IR might be a suitable method for the quality control of biochars made at ...
  

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  ... before the XPS measurement 1 h at 100 'C and subsequently 2 h at 200 "C. All components used for the deconvolution of the peaks were symmetric signals except C1s C-C sp?. Reference data were taken from the literature [70]. FT-IR spectroscopy. Fourier transform infrared Spectroscopy (FT-IR) was used ...
  

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  ... extraction methods, FT-IR could be quite powerful for the characterization of biochars made by pyrolysis and hydrochars, but requires elaborate protocols and the adjustment of reproducible moisture content, because OH bands are strongly affected by the presence of water. Like XPS, FT-IR cannot discriminate ...
  

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  Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann. "Surface functional groups and degree of carbonization of selected chars from different processes and feedstock" in PLOS ONE (2022). https://doi.org/10.1371/journal.pone.0277365

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  Razrada i primena metode IR spektroskopije za kvantitativno proučavanje vrste i stepena alteracije feldspata cite

  Vesna Poharc-Logar (1987)

  IR spektroskopija, alteracija, feldspat

  Vesna Poharc-Logar. Razrada i primena metode IR spektroskopije za kvantitativno proučavanje vrste i stepena alteracije feldspata, Beograd:Rudarsko Geološki Fakultet, 1987

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  Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5) cite

  Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović (2014)

  Sphene (CaTiSiO5), a calcium titanosilicate ceramic has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization and activation of precursors. During the highpressure and high-temperature synthesis (HPS) process at 4 GPa and 1,200 °C, sphene undergoes into phase transition, from room-temperature phase P21/a to high-temperature phase A2/a. Evidence of that structural phase transition is given in this paper using infrared, Raman spectroscopy and X-ray powder diffraction. Rietveld refinement was employed to get the ...

  Sphene, Phase transition, Raman spectroscopy, X-ray diffraction, SEM, IR

  Jelena Pantić, Vladimir Urbanovich, Vesna Poharc-Logar, Bojan Jokić, Marija Stojmenović, Aleksandar Kremenović, Branko Matović. "Synthesis and characterization of high-pressure and high-temperature sphene (CaTiSiO5)" in Physics and Chemistry of Minerals, Springer Science and Business Media LLC (2014). https://doi.org/10.1007/s00269-014-0693-x