Table 1.

Lattice parameters and membrane thicknesses obtained from X-ray scattering for mixtures of anion C₁₅-COOH and cation C₁₆-K₂ (Fig. 2 B and C)

pH	Crystal form	Domain size, nm	Lattice const, nm	Area per molecule, nm2	Membrane thickness, nm
3	Hexagonal	24	a = 0.477	0.197	5.8
6.5	Rectangular-C	13	a = 0.483	0.192	4.2
			b = 0.795
8.5	Rectangular-P	33	a = 0.484	0.188	3.8
			b = 0.775
9.5	Rectangular-C	23	a = 0.484	0.188	4.0
			b = 0.775
10.5	Hexagonal	36	a = 0.474	0.195	3.3