Table 1.

Dimensions of the nanotubes generated from 1 and 2 determined by DLS, SAXS, and TEM

	DLS,*RH, nm	SAXS,† diameter, nm	TEM,‡ diameter, nm	Computed§ diameter, nm
1	16.0	3.6  ± 0.66	3.9 (3.9)	4.0
1 + NaCl	17.0	4.13  ± 0.70	4.2 (4.1)	4.0
1 + KCl	17.0	3.71  ± 0.47	4.0 (3.9)	4.0
2	26.7	—	4.5 (4.4)	4.3
2 + NaCl	27.0	3.5  ± 0.09¶	4.4 (4.5)	4.3
2 + KCl	27.0	3.5  ± 0.09¶	4.4 (4.4)	4.3

^*[1] = [2] = [NaCl] = [KCl] = 2 × 10⁻³ M in water. 

^† [1] = [2] = [NaCl] = [KCl] = 1.3 × 10⁻³ M in water at 20°C. 

^‡ [1] = [2] = [NaCl] = [KCl] = 2 × 10⁻⁴ M in water. The numbers in parentheses were recorded for the same aqueous samples after incubation at 70°C for 30 min in a thermostated bath. All the outer diameters include a layer of the staining agent and are each an average of 100 measurements made on randomly selected nanotubes. These numbers were also confirmed by using 2D-FT of densely packed nanotubes (see Fig. 5). 

^§ Computer models generated by using MACROMODEL 7.2. 

^¶ Measurement performed in 10 mM Mes buffer, pH 5.5. This solution contains a 5-fold excess of sodium and potassium with respect to 2. In the absence of the Mes buffer the data was not reproducible.