Thermal degradation of polymethylsilsesquioxane and microstructure of the derived glasses

Adaptive Silicon Oxycarbide Coatings With Controlled Hydrophilic or Hydrophobic Properties

“…As it was already mentioned above (Figure 1e, inset) a remarkable effect is observed at the crests of the grooves: the delamination of the crests occur in form of partly branched-off fibers (Figure 6b, d, f). Similar fractureinduced scrolled fibers were observed previously by Hausmann et al [5] in manually fractured bulk PMS derived flakes.…”

“…[4][5][6] The advantages of the polymer precursor route to glasses or ceramics over a traditional ceramic processing route are: i) polymers can generally be converted to metastable ceramics at temperatures less than 1 200 C; ii) polymers can be readily purified; iii) ceramics coatings exhibiting complex shapes can be fabricated; iv) porous ceramics coatings can be used as catalysts, adsorbents as well as supports for heterogeneous metal catalysis; and v) chemical and physical properties of the derived coatings can be tuned by designing preceramic polymers and controlling the polymer pyrolysis. [4] However, up to now, no studies have been carried out focusing on the high-temperature performance of Si-O-C coatings which exhibit adaptive properties.…”

“…First, in 2011 [5] a spontaneous formation of micrometer-sized scrolled Si-O-C filaments was observed at the surfaces of manually fractured free-standing flake-shaped glassy residues (flakes) obtained after pyrolysis of a polymethylsilsesquioxane (PMS) powder. Later, [6] it was noticed that after PMS pyrolysis, in a combustion porcelain boat (Figure 1a), a large amount of free-standing flakes are formed ( Figure 1b).…”

“…Obviously, the propagating cracks induced by thermal stresses cut the solidifying material into two parts: a thin coating adhered to the boat (Figure 1e) and the free-standing delaminated flakes. Moreover, as a result of delamination, partly branched-off filaments, similar to the previously reported in ref., [5] are formed at the periodically arranged crest tips of the coating (Figure 1e, inset). It is surprising to note that the selfassembled Si-O-C morphology mimics the surface structure of the human skin.…”

Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

“…Similar morphology of fracture surface was also observed in SiOC derived from pristine PMS [46] and polymer containing PMS and D 4 Vi [47]. PH1/1500' reveals a particular region of PH1/1500 sample with higher magnification, in which was verified the initial formation of agglomerations as well as for CC2/1500.…”