Journal of Nanomaterials

Research Article

Microstructural Analysis and Magnetic Characterization of Native and Magnetically Modified Montmorillonite and Vermiculite

Table 1

Chemical composition in wt% of the montmorillonite and vermiculite in their original states (Mt, Ver) and after the magnetic modification (MMt, MVer). LOI is loss on ignition; Mt_n, MMt_n,Ver_n, and MVer_n denote normalized contents without LOI. Mt_EDX, MMt_EDX, Ver_EDX, and MVer_EDX are the values obtained by EDX analysis and recalculated with respect to oxygen.


	Mt	Mt_n	Mt_EDX	MMt	MMt_n	MMt_EDX	Ver	Ver_n	Ver_EDX	MVer	MVer_n	MVer_EDX

Al₂O₃	14.4 ± 1.1	17.28	17.28	14.1 ± 1.2	18.23	16.68	10.5 ± 0.8	12.62	12.60	10.4 ± 0.8	12.32	14.18
SiO₂	55.5 ± 2.3	70.28	73.56	54.1 ± 2.2	70.28	69.85	39.6 ± 1.6	67.46	51.63	39.2 ± 1.6	46.42	51.37
TiO₂	0.17 ± 0.02	0.22	0.23	0.17 ± 0.02	0.22	0.25	1.03 ± 0.12	1.24	1.40	1.02 ± 0.12	1.21	0.34
Na₂O	0.20 ± 0.02	0.25	0.26	0.20 ± 0.02	0.25	0.16	0.50 ± 0.05	0.60	0.54	0.50 ± 0.05	0.59	0.07
K₂O	0.16 ± 0.0	0.20	0.14	0.16 ± 0.01	0.20	0.16	2.20 ± 0.14	2.64	3.74	2.18 ± 0.03	2.58	0.03
MgO	4.13 ± 0.25	5.23	4.54	4.03 ± 0.25	5.03	4.06	21.1 ± 1.28	25.37	18.28	20.9 ± 1.25	24.75	22.72
CaO	1.85 ± 0.12	2.34	2.14	1.81 ± 0.11	2.26	2.25	1.88 ± 0.13	2.26	2.20	1.86 ± 0.12	2.20	0.17
Fe₂O₃	2.56 ± 0.10	3.24	1.87	4.69 ± 0.09	3.24	6.58	6.37 ± 0.25	7.66	9.61	7.54 ± 0.15	8.93	11.11
FeO	—	—	1.87	0.93 ± 0.08	1.16	6.58	—	—	9.61	0.84 ± 0.08	0.99	11.11
LOI	21.30 ± 0.30	—	—	20.30 ± 0.40	—	—	19.44 ± 0.02	—	—	19.60 ± 0.40	—	—