University of Architecture, Civil Engineering and Geodesy

About: University of Architecture, Civil Engineering and Geodesy is a education organization based out in Sofia, Bulgaria. It is known for research contribution in the topics: Finite element method & Beam (structure). The organization has 3808 authors who have published 3822 publications receiving 30736 citations. The organization is also known as: Sofia Polytechnic.

Chemically binding carboxylic acids onto TiO2 nanoparticles with adjustable coverage by solvothermal strategy.

Abstract: This paper presents a solvothermal strategy for chemical modification of TiO2 nanoparticles with carboxylic acids. Solvothermal reaction between the TiO2 nanoparticles and carboxylic acid molecules in an autoclave at 100 °C provides carboxylic acid-modified TiO2 particles with a modification efficiency much higher than the conventional immersion method. TiO2 nanoparticles were prepared by hydrolysis of titanium isopropoxide in nitric acid solution; the modified nanoparticles were characterized by powder X-ray diffraction pattern, scanning electron microscopy, absorption and Fourier transform infrared spectra, and thermogravimetric analysis. Results show that the binding form of the modifier molecules on TiO2 surface is in a bidentate chelating mode, the crystalline phase composition and morphological structure of the preformed TiO2 nanoparticles are not affected by the solvothermal reaction, and the surface coverage of the modifier molecules can be adjusted by the weight ratio of modifer/TiO2 during feedi...