Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide
The coprecipitation method was used to prepare Zn-Al layered double hydroxide (Zn-Al-NO3-LDH) at pH 7.5 and different Zn 2+/Al3+ molar ratios of 2, 3, 4, 5, and 6. The elemental, structural, and textural properties of prepared samples were studied. The crystallinity of prepared LDH nanostructure dec...
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| Format: | Article |
| Language: | English English |
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Hindawi Publishing Corporation
2013
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| Online Access: | http://psasir.upm.edu.my/id/eprint/30176/ http://psasir.upm.edu.my/id/eprint/30176/1/Influence%20of%20metallic%20molar%20ratio%20on%20the%20electron%20spin%20resonance%20and%20thermal%20diffusivity%20of%20Zn.pdf |
| _version_ | 1848846603272585216 |
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| author | Ali Ahmed, Abdullah Ahmed Talib, Zainal Abidin Hussein, Mohd Zobir |
| author_facet | Ali Ahmed, Abdullah Ahmed Talib, Zainal Abidin Hussein, Mohd Zobir |
| author_sort | Ali Ahmed, Abdullah Ahmed |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The coprecipitation method was used to prepare Zn-Al layered double hydroxide (Zn-Al-NO3-LDH) at pH 7.5 and different Zn 2+/Al3+ molar ratios of 2, 3, 4, 5, and 6. The elemental, structural, and textural properties of prepared samples were studied. The crystallinity of prepared LDH nanostructure decreases as Zn2+/Al 3+ molar ratio increases. The electron spin resonance (ESR) spectroscopy of different LDH samples showed new ESR spectra. These spectra were produced due to the presence of different phases with formed LDH such as ZnO phase and ZnAl2O4 spinel. At low Zn2+/Al 3+ molar ratio, the ESR signals were produced from the presence of free nitrate anions in the LDH interlayer. Above Zn2+/Al3+ = 2, the ESR signals were attributed to the existence of ZnO phase and ZnAl2O4 spinel in the samples. Because the nuclear magnetic moment of 67Zn is lower than 27Al, the increasing in Zn2+/Al3+ molar ratio causes a reduction of the magnetic activity of ZnAl2O4 spinel. Thermal diffusivity versus in situ temperature showed nonlinear relation for different samples due to the changing in the water content of LDH as temperature increases. The dc conductivity of samples decreased as Zn2+/Al3+ molar ratio. |
| first_indexed | 2025-11-15T09:05:20Z |
| format | Article |
| id | upm-30176 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T09:05:20Z |
| publishDate | 2013 |
| publisher | Hindawi Publishing Corporation |
| recordtype | eprints |
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| spelling | upm-301762015-09-14T07:41:33Z http://psasir.upm.edu.my/id/eprint/30176/ Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide Ali Ahmed, Abdullah Ahmed Talib, Zainal Abidin Hussein, Mohd Zobir The coprecipitation method was used to prepare Zn-Al layered double hydroxide (Zn-Al-NO3-LDH) at pH 7.5 and different Zn 2+/Al3+ molar ratios of 2, 3, 4, 5, and 6. The elemental, structural, and textural properties of prepared samples were studied. The crystallinity of prepared LDH nanostructure decreases as Zn2+/Al 3+ molar ratio increases. The electron spin resonance (ESR) spectroscopy of different LDH samples showed new ESR spectra. These spectra were produced due to the presence of different phases with formed LDH such as ZnO phase and ZnAl2O4 spinel. At low Zn2+/Al 3+ molar ratio, the ESR signals were produced from the presence of free nitrate anions in the LDH interlayer. Above Zn2+/Al3+ = 2, the ESR signals were attributed to the existence of ZnO phase and ZnAl2O4 spinel in the samples. Because the nuclear magnetic moment of 67Zn is lower than 27Al, the increasing in Zn2+/Al3+ molar ratio causes a reduction of the magnetic activity of ZnAl2O4 spinel. Thermal diffusivity versus in situ temperature showed nonlinear relation for different samples due to the changing in the water content of LDH as temperature increases. The dc conductivity of samples decreased as Zn2+/Al3+ molar ratio. Hindawi Publishing Corporation 2013 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/30176/1/Influence%20of%20metallic%20molar%20ratio%20on%20the%20electron%20spin%20resonance%20and%20thermal%20diffusivity%20of%20Zn.pdf Ali Ahmed, Abdullah Ahmed and Talib, Zainal Abidin and Hussein, Mohd Zobir (2013) Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide. Journal of Nanomaterials, 2013. art. no. 639354. pp. 1-9. ISSN 1687-4110; ESSN: 1687-4129 http://www.hindawi.com/journals/jnm/2013/639354/ 10.1155/2013/639354 English |
| spellingShingle | Ali Ahmed, Abdullah Ahmed Talib, Zainal Abidin Hussein, Mohd Zobir Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title | Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title_full | Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title_fullStr | Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title_full_unstemmed | Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title_short | Influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of Zn-Al layered double hydroxide |
| title_sort | influence of metallic molar ratio on the electron spin resonance and thermal diffusivity of zn-al layered double hydroxide |
| url | http://psasir.upm.edu.my/id/eprint/30176/ http://psasir.upm.edu.my/id/eprint/30176/ http://psasir.upm.edu.my/id/eprint/30176/ http://psasir.upm.edu.my/id/eprint/30176/1/Influence%20of%20metallic%20molar%20ratio%20on%20the%20electron%20spin%20resonance%20and%20thermal%20diffusivity%20of%20Zn.pdf |