No abstract

Articles you may be interested inEffect of molecular-scale surface morphology on the surface melting of liquid crystals on self-assembled monolayers Appl. Phys. Lett. 105, 251601 (2014); 10.1063/1.4904823Effect of nanoparticle polydispersity on the self-assembly of polymer tethered nanospheres A Monte Carlo study of crowding effects on the self-assembly of amphiphilic molecules Abstract. Surfactants self-assemble in bulk aqueous solution to form different microstructure. The self assembled structures may easily rearrange if parameters like concentration, ionic strength, or temperature are changed, which renders self-assembled systems particularly interesting. Here we examine the influence of n-nonanol and n-decanol on the viscosity behaviour of CTAB/KBr system. The alcohols of varying concentrations were added to CTAB/KBr solutions and were kept in a hot bath at a temperature of 45°C with proper shaking for homogeneity. The viscosity of the micellar solution was measured using Brookfield DV -II + viscometer at temperatures ranging from 25-60° C. It is observed that the η 0 is a strong function of concentration of alcohols. In the case of nonanol four regions were identified in the plot of zero shear viscosity Vs. concentration of alcohol. At low C 0 , viscosity is low (Region I). With increase in concentration of alcohols the spherical micelles will grow into cylinders and at higher C 0 , they entangle with each other to form worm like micelles, indicated by a rapid increase in viscosity resulting in a peak (Region II). Subsequent to this observation a decrease of η 0 (Region III) followed by a plateau is observed. The drastic decrease in viscosity could be due to decrease in the mean size of the micelles or due to the formation of other self assembled structures. With further increase in C 0 the viscosity again decreases. In this region the micellar solution is turbid and show optically birefringence In region (IV), it show very interesting viscosity behavior. Here viscosity increases with increase in temperature. Only three regions were identified in the case of CTAB/KBr/decanol system and there was no lyotropic liquid crystal formation at high concentration. Thus by just increasing the length of alcohol by one carbon, there was drastic change in their property