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OPTIMIZING PARAMETERS IN SYNTHESIS OF LiF NANOPOWDERS VIA SOL–GEL METHOD
FAEZEH NIKANJAM,RASOUL SARRAF-MAMOORY,NASTARAN RIAHI-NOORI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.6
Lithium fluoride (LiF) nanopowders were prepared by trifluoroacetate-based sol–gel processing. In this work, lithium acetate dehydrate (LiAc ⋅ 2H2O) and trifluoroacetic acid (TFA) was used as lithium and fluorine sources. The thermal behavior of initial gel was examined using differential thermal analysis (DTA). Effects of solvent (glacial acetic acid, absolute ethanol, and ethylene glycol), Li+ concentration (0.5, 1, and 2 mol/l) and decomposition temperature (200, 250, and 300°C) on synthesis of LiF nanopowders by sol–gel method were investigated. The results of LPSA, FE-SEM, and XRD showed that the growth of particles and aggregation can be controlled by changing above parameters. However, it is indicated that optimum conditions are; solvent as ethanol, Li ion concentration (0.5 mol/l), and decomposition temperature (300°C), respectively. Also, the addition of oleic acid as an organic additive made the final LiF particles finer and about 70–90 nm.
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Farzan Karimi,Saeid Baghshahi,Mohsen Nouri Khezrabad,NASTARAN RIAHI-NOORI 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In tile and ceramic industry, frits are used for producing opaque and glossy glazes. Commonly used frits are prepared by using opacifiers such as ZrO2 and TiO2, but the high price of these raw materials leads to a higher cost of the final product. In this research, an opaque frit containing in-situ synthesized Wollastonite (CaSiO3) and Diopside (CaMgSi2O6) was developed as a substitute for Zircon-containing frits. By choosing optimized proportions of oxides in the frit composition, sufficient crystallization occurred in MgO-CaO-Al2O3-ZnO-B2O3-SiO2-K2O-Na2O glass ceramic system. XRD, SEM, EDS, STA, and colorimetry (CIELab) tests were used to compare the prepared samples with a reference zircon containing one which is used in tile industry. The results showed that whiteness and glossiness indices of the prepared sample were 73.61 and 86.56, respectively, which are comparable with those of zircon-free reference sample with whiteness and glossiness indices of 77.05 and 89.22, respectively.
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