The coloring of geopolymers by the addition of copper compounds
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- 作者：Hayami Takeda ; takeda.hayami@nitech.ac.jp" class="auth_mail ; Shinobu Hashimoto ; Sawao Honda ; Yuji Iwamoto
- 关键词：C. Color ; C. Mechanical properties ; D. Silicate ; Geopolymers ; Chrysocolla
- 刊名：Ceramics International
- 出版年：June, 2014
- 年：2014
- 卷：40
- 期：5
- 页码：6503-6507
- 全文大小：867 K
文摘
The development of a new coloring technique is desirable to increase the commercial value of geopolymers. Selected copper compounds, i.e. Cu(OH)2, CuO, Cu2O, CuCO3鈭機u(OH)2鈭橦2O, CuCl2鈭?H2O and CuSO4鈭?H2O, were added to the initial reactants in order to color the geopolymers in the same manner as naturally occurring minerals. When Cu(OH)2, CuO and Cu2O were used, these compounds remained in the geopolymer matrix following hardening of the material. On the contrary, CuCO3鈭機u(OH)2鈭橦2O, CuCl2鈭?H2O and CuSO4鈭?H2O were not detected in the final products. XAFS analyses were performed to investigate the local structure of copper in the geopolymers produced. The results showed that the copper spectra of geopolymers incorporating Cu(OH)2, CuO and Cu2O correspond to those of pure Cu(OH)2, CuO and Cu2O, respectively. However, when CuCO3鈭機u(OH)2鈭橦2O, CuCl2鈭?H2O and CuSO4鈭?H2O were added, the copper generated spectra similar to that of the mineral chrysocolla ((Cu, Al)2H2Si2O5(OH)4鈭?em>nH2O) than the respective copper compounds.