The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

Table 7

Parameter values obtained by fitting the effective diffusion coefficient versus size of the diffusing molecule by the power law expression (15). The numbers in the top line are taken from [23]. “Tortuosity” is defined similarly as expression (17).

Water
			(m^2/s)	( )
			Code					τ
	(-)	(m^2/s)		(m^−1)	( )	( )
K2	⊥	0.4			8.4	0.2
K4	//	0.38			3.1	0.7
K14	//	0.37		2.2 ± 0.6	10.0	−0.8
K15	//	0.4		2.4 ± 0.7	6.6	−0.6
K16	⊥	0.41		2.3 ± 0.9	8.3	−0.7
K17	⊥	0.4		2.9 ± 0.8	5.5	−0.2
Bent 1.4		0.47			2.8	1.9
Bent 1.6		0.4			0.2	4.5
COX 1	⊥	0.18			1.9	2.8
OPA 1	⊥	0.096			94.2	−0.4