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On heat transfer and flow characteristics of jets impinging onto a concave surface with varying jet arrangements |
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| Authors: | Qiu Dandan Wang Chenglong Luo Lei Wang Songtao Zhao Zhiqi Wang Zhongqi |
| Institution: | 1.Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4., Budapest, 1111, Hungary ;2.Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8., Budapest, 1111, Hungary ;3.Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, Konkoly Thege M. út 29-33., Budapest, 1121, Hungary ;4.Department of Chemistry, Biochemistry and Environmental Protection, University of Novi Sad, Trg Dositeja Obradovica 3, 21000, Novi Sad, Serbia ; |
| Abstract: | A new electrospinning process was developed for preparing TiO2 nanofibers using a water-soluble Ti-precursor, bis(kappa1O-hydroxo)(bis(kappa2O,O′-lactato)titanium(IV)] commonly known as titanium(IV) bis (ammonium lactato) dihydroxide (TiBALDH). The importance of the study is justified by the fact that Ti-precursors used for electrospinning, sol–gel, hydrothermal and other fiber synthesis processes are mostly non-water soluble. Accordingly, anatase TiO2 nanofibers of diameter between 20 and 140 nm were synthesized by electrospinning and annealing. Polyvinylpyrrolidone (PVP) and different concentrations of TiBALDH were dissolved in a mixture of water, ethyl alcohol and acetic acid to optimize the electrospinning conditions. The thermal decomposition and fragmentation of PVP, TiBALDH and the fibers with 50% mass fraction of TiBALDH were studied by TGA-MS measurements. The fibers were then annealed at 1 °C min?1 until 600 °C. The TiO2 fibers were characterized using SEM–EDX, FTIR and XRD |
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