Synthesis of AgBiS2 microspheres by a templating method and their catalytic polymerization of alkylsilanes

Abstract

AgBiS2 microspheres synthesized by using PEG as a template serve as active catalysts for the polymerization of an alkylsilane, C18H37SiH3 with water to form silanols.

Polymerization of Alkylsilanes on ZIF-8 to Hierarchical Siloxane Microspheres and Microflowers

“…Furthermore, the ZIF-8-polymer composite products with hierarchical structures had a water contact angle of 107.9° ( Figure S9b) which is higher than that of ZIF-8 (82.5°, Figure S9a). The polymerization composites Although the exact mechanism for the formation of hierarchical siloxane structures is not clear, based on the literature [18][19][20][21][22] and the results in the current study, we propose that the monomer molecule of ODS assembled and polymerized, and finally formed the novel hierarchical structures. The ZIF-8 nanocrystals catalyzed the polymerization reaction and oriented the growth of the siloxane polymers.…”

“…As shown in Figure 4, the red full lines are experimental curves and the black lines are calculated curves. The narrow scan spectra of Si 2p (Figure 4) shows that the binding energy values of Si 2p are 101.0 eV and 102.0 eV, which could be attributed to Si-H [21] and Si-O [21] bonds, respectively. The formation of the Si-O bond could be promoted by increasing the amount of ZIF-8 or by raising the reaction temperature.…”

“…The reactions were firstly carried out at 90 °C as in our previous studies [19][20][21]. A significant change in intensity at the wavenumber of 2150 cm −1 was observed in the FT-IR spectra owing to the stretching peak of Si-H (Figure 1c), using 10 mg ZIF-8 for 4 h. The Si-H bonds' absorption of the obtained product became weaker than that of pure C18H37SiH3.…”

“…The route for polymerizing octadecylsilane catalyzed by gold nanoparticles was similar to that described by references [18][19][20][21]. The polymerizations of octadecylsilane in this work were carried out in a round-bottom flask under magnetic stirring.…”

“…There have been a few reports on the preparation of siloxanes with hybrid nano-and micro-structures by the aggregation of saturated alkylsilanes (C 18 H 37 SiH 3 , ODS), originally using noble metal nanoparticles as catalysts [18][19][20][21][22]. Ternary chalcogenide compounds (AgBiS 2 ) and polyvinyl pyrrolidone-capped silver nanoparticles have also been confirmed to be able to catalyze the polymerization of alkylsilanes to form polysiloxanes [19][20][21] in our previous works. In addition, a noble metal salt, as a homogeneous catalyst, was also used to synthesize siloxane nanowires and hybrid metal core-siloxane shell nanoparticles [22].…”