Dodecane and tetradecane were used as solvents for sample preparation. It is likely that the different lengths of alkane chain have no effect on diameter and length of these fibrils. In case of low concentration, i.e. 0.05% wt of o-Cl-DBS and m-ClDBS,the fibril network could not be observed by TEM and SEM techniques. Therefore, the concentration of o-Cl-DBS and m-ClDBS were increased up to 0.1 and 0.2% wt, respectively. It was found that the fibril network can be revealed and their diameters are similar to those of p-Cl-DBS and p-Br-DBS.