Hydrothermal synthesis of aqueous nano-TiO2 sols

• Autorzy: Mahata S. , Kundu D.
• Języki publikacji: EN

Abstrakty

EN

A poorly crystalline nano-anatase precursor with the crystallite sizes of about 3.5 nm was prepared via reprecipitation of nano-anatase at pH = 7.0 from a highly transparent sol obtained by acidic peptization of hydrous titania precipitates, hydrolysed product of titanium isopropoxide. The weakly agglomerated nano-anatase precursor has been used for preparing well crystalline nano-TiO2 sols by hydrothermal treatment at pH = 9.5 using a weak base, NH4OH. The crystallite size gradually grew with increasing temperature and reached 7.6 nm (X-ray) at 175 °C after 4 h of hydrothermal treatment. The sizes of particles were mostly in the range 5-15 nm. The hydroxyl content in the nano-TiO2 decreased with increasing hydrothermal temperature of treatment and supported a gradual growth of nano-TiO2 as evident from the X-ray and TEM.

Słowa kluczowe

EN

nano TiO2 sol; peptization; hydrothermal treatment

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 2
• Strony: 465--470
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Mahata S.

autor

Kundu D.

• Sol-Gel Division, Central Glass and Ceramic Research Institute, 196, Raja S. C. Mullick Road, Kolkata 700 032, India

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