《Table 2–Effect of SHL and ML concentrations on the solution properties.》

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《Design and characterization of monolaurin loaded electrospun shellac nanofibers with antimicrobial activity》

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The solution property might play a significant role in the electrospinning process affecting the morphology of the obtained nanofibers.During the electrospinning process，the solution was ejected from the needle tip depending on the stretching capacity of the solution which would be influenced by conductivity，viscosity and surface tension[20].Obviously，as illustrated in Table 2，the increased concentration of SHL led to a remarkable increase in viscosity，a slight decline in conductivity，but no significant change in surface tension.The viscosity was directly related to SHL content.As the concentration of SHL was increased，the amount of polymer chain entanglement was also increased resulting in a significant elevation in viscosity[20].Generally，SHL is a non-ionic polymer with dielectric constant（ε）of 3.6[25].When the SHL content was increased，the electrical conductivity of a solution seemed to decline as a result of the decreased charge carrier mobility.Meanwhile，the surface tension of a solution was not significantly different.This could be explained by the dispersed distribution of SHL molecules in the solution which was not projected to the surface.