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Table 1 Physicochemical parameters derived from nitrogen physisorption and XRD data for different samples (d ₁₀₀ is the interplanar spacing of the hexagonal structure; a ₀ represents the pore-to-pore distance of the hexagonal structure)

From: Two-Solvent Method Synthesis of NiO/ZnO Nanoparticles Embedded in Mesoporous SBA-15: Photocatalytic Properties Study

Samples	d ₁₀₀ (nm)	a ₀ (nm)	S _BET (m²/g)	Pore diameter (nm)	Pore volume (cm³/g)
S0	10.6	12.2	812.5	6.43	0.98
S1	9.9	11.4	698.1	6.19	0.89
S2	10.1	11.7	584.8	6.13	0.80
S4	10.3	11.9	509.3	6.06	0.73

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