Macromolecular Research, Vol.21, No.9, 1004-1010, September, 2013
Transparent organosilicate hybrid films with thermally insulating and UV-blocking properties based on silica/titania hybrid hollow colloidal shells
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Transparent, thermally insulating, and UV-blocking organosilicate (OS) hybrid films were successfully demonstrated based on nano-sized silica/titania hybrid hollow shells (STHs). A large scale of STHs were conveniently prepared by using nano-sized poly(acrylic acid) (PAA) colloidal aggregates as templates, tetraethyl orthosilicate (TEOS) as a silica precursor, and titanium tetrabutoxide (TBOT) as a titania presursor by the simple sol-gel reaction. The prepared STHs showed the strong affinity with OS matrices and the excellent transparency within the OS matrices due to their small size about 50 nm. Furthermore, TiO2 shells formed on the SiO2 shell surfaces selectively absorbed the UV light maintaining high transparency of the OS hybrid films in the visible range. The hollow inner space within the STHs enables the interruption of heat flow and the reduction in thermal diffusivity of the OS hybrid films, showing that the thermal conductivity of the OS hybrid films decreased about 20% when compared with the OS films without STHs. With these advantages, multifunctional OS hybrid films with thermally insulating and UV-blocking properties as well as excellent transparency in the visible range could be achieved.
Keywords:organosilicate(s);hollow silica shell(s);titania;hybrid(s);thermal conductivity;UV-block;transparent
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