Our first funded project from this network is:
Project title: ''Charge carrier transportation in perovskite materials: an ultrafast x-ray absorption spectroscopic study''.
Researcher: Van Thai Pham (Sweden), Minh Tuan Trinh (USA) and Viet Mui Luong (Japan)
Amount: 100 000 SEK (10 000 euro) for equipments
Funder: The Walter Gyllenberg Foundation, Sweden
Time: 2021-2023
Detailed information of each sample and their spectra can be accessed by clicking their names above.
Description of soot originality
A mini-CAST 5201C soot generator (mini-CAST Jing Ltd.) was used to produce the soot nanoparticles. In this generator, a co-flow propane–air diffusion flame is quenched at a fixed height with N2 gas resulting in a gas stream containing soot particles. The quenching gas prevents the soot particles from further combustion and restricts further reactions in the particle stream at ambient air conditions. Soot with various characteristics was achieved by changing the flame operating conditions (OP), from small soot particles with a high organic fraction (OP7) to larger aggregated soot particles with a low organic fraction (OP1). When we change the burning condition towards higher OP by diluting the fuel with nitrogen, the flame temperature is reduced as well as earlier stages in the soot formation processes are quenched.
MiniCAST soot generator 5201C
Flame images and their soot deposited on saphire windows
References
K.C. Le et al. (2019), Raman spectroscopy of mini-CAST soot with various fractions of organic compounds: Structural characterization during heating treatment from 25 °C to 1000 °C, Combustion and Flame, 219-320
V.B. Malmborg et al. (2019), Relat- ing aerosol mass spectra to composition and nanostructure of soot particles, Carbon 142 535–546.
S. Török et al., Investigation of the absorption Angström exponent and its relation to physicochemical properties for mini-CAST soot, Aerosol Sci. Technol. 52 (2018) 757–767