Thermochemical and thermophysical mapping of burning superslim and kingsize cigarettes
After presenting and publishing the proof of principle of the in-situ thermochemical and thermophysical mapping inside a burning Super Slim (SS) cigarette, we now extended the study scope to other cigarette formats and smoking regimes.
A Chinese Virginia-style Super Slim and the respective King Size (KS) cigarette were investigated under ISO as well as Health Canada Intense (HCI) smoking regime.
A micrometre sampling bench was used to accurately position the in-situ sampling probes for insertion into the cigarettes. An array of 0.254-mm thermocouples (for gas-phase temperature determination) and multiple 0.35-mm diameter quartz tubes connected to transducers (for pressure determination) were inserted into the SS cigarette. For chemical analysis, a single heated 0.5-mm chemical sampling microprobe was also inserted and coupled to a single-photon soft ionisation (SPI) mass spectrometer through a heated transfer line. The different measurement techniques were synchronised by mapping two probes at one point in time (e.g. temperature/pressure or temperature/chemistry).
The mapping approach provides complex as well as dynamic variating data that allows the comprehensive description of the main thermophysical and thermochemical phenomena. Due to the different geometric parameters of SS and KS cigarettes, differences between the SS and KS cigarettes in the chemical fingerprint patterns during a puff were observed. In addition, the higher intensity of the puff under HCI in comparison to the ISO regime alters the thermophysical and thermochemical profile inside the burning cigarette.
The spectrum of the generated information ranges from simple process understanding, such as the spatially resolved thermal desorption of nicotine or the thermal degradation of nicotine, to more complex mechanistic physical-chemical understanding inside a burning cigarette.
 Huapeng Cui, Sven Ehlert, Fuwei Xie, Jan Heide, Nan Deng, Bin Li, Chuan Liu, Kevin McAdam, Andreas Walte, Ralf Zimmermann; Integration of time and spatially resolved in-situ temperature and pressure measurements with soft ionisation mass spectrometry inside a burning superslim cigarette, Journal of Analytical and Applied Pyrolysis, Volume 135, 2018, Pages 310-318.