title: Pyrolysis in the mesophase: a chemist's approach toward preparing carbon nano- and microparticles.
abstract: A mild pyrolytic method is proposed for the generation of different carbon micro- and nanoparticles that are either unprecedented or have never been reported under the present experimental conditions. A hexa-alkyl-substituted hexa-peri-hexabenzocoronene serves as a graphite-like starting compound that melts into a discotic liquid crystalline phase prior to heat-induced cross-linking and dehydrogenation. An essential feature of the process is that the liquid crystalline order persists even above 400 degrees C, i.e., during alkyl chain cleavage. The present approach bears a resemblance to carbomesophase formation during graphitization starting from pitch. The pyrolysis products are characterized by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, optical microscopy, selected area electron diffraction (SAED), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM).
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Lileta
authors.initials: L
authors.lastname: Gherghel
authors.forename: Christian
authors.initials: C
authors.lastname: Kübel
authors.forename: Günter
authors.initials: G
authors.lastname: Lieser
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Räder
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen