Fluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposites possessing photocatalytic activity even after calcination at 1000°C

Preparation and properties of fluorinated aliphatic alcohols/silica nanocomposites – Application to the encapsulation of anatase titanium oxide nanoparticles into these composite cores

“…We have very recently reported that fluoroalkyl end-capped vinyltrimethoxysilane oligomer [R F -CH 2 CHSi(OMe) 3 ] n -R F ; n = 2, 3; R F = CF(CF 3 )OC 3 F 7 ] undergoes the sol-gel reactions in the presence of anatase TiO 2 nanoparticle (an-TiO 2 ) under alkaline conditions to give the corresponding fluorinated oligomeric silica nanocomposites -encapsulated an-TiO 2 nanoparticles [42]. Interestingly, the fluorinated nanocomposites -encapsulated an-TiO 2 nanoparticles before and even after calcination can give a higher photocatalytic activity than that of original an-TiO 2 nanoparticles under similar conditions.…”

High Temperature Corrosion of Titanium Under Conditions Relevant to Pressure Leaching: Mass Loss and Electrochemistry

“…The XRD spectrum presented in Figure 2 presents very sharp peaks and indicates that the corrosion products are mainly TiO 2 , which is in good agreement with already published work. [38][39] Given the presence of H 2 S, H 2 , and the formation of TiO 2 , it is likely that the reactions shown in Equations (11) …”

UV resistance of encapsulated low molecular weight aromatic compounds in fluoroalkyl end‐capped trimethoxyvinylsilane oligomer/silica nanocomposites

“…During our comprehensive studies on the fluorinated polymers possessing a surface active characteristic, we have already found that partially fluoroalkylated polymers, especially two fluoroalkyl end‐capped oligomers are attractive fluorinated materials because they exhibit a wide variety of unique properties such as high solubility, surface‐active properties, biological activities and nanometer size‐controlled self‐assembled molecular aggregates, which cannot be achieved by the corresponding nonfluorinated and randomly fluoroalkylated ones . In these fluoroalkyl end‐capped oligomers, fluoroalkyl end‐capped trimethoxyvinylsilane oligomers are in particular interest due to them exhibiting higher surface active characteristics . Here we report that fluoroalkyl end‐capped trimethoxyvinylsilane oligomer/silica nanocomposites, which are prepared by the sol–gel reactions of the corresponding oligomer under alkaline conditions, can be applied to the encapsulation of organic stabilizers such as 1,1′‐bi(2‐naphthol) [BINOL] and 2‐hydroxy‐4‐methoxy benzophenone [HMB], and encapsulated BINOL and HMB into these fluorinated nanocomposite matrices can exhibit an excellent UV resistance with an extremely higher thermal stability.…”