Correction: Structural bases for mechano-responsive properties in molecular gels of (R)-12-hydroxy-N-(ω-hydroxyalkyl)octadecanamides. Rates of formation and responses to destructive strain

摘要: The self-assembly and gelation behavior of a series (R)-12-hydroxy-N-(ω-hydroxyalkyl)octadecanamides (HS-n-OH, where n = 2, 3, 4 5 is the length alkyl chain on nitrogen), as well those two ‘model’ compounds, N-(3-hydroxypropyl)octadecanamide (S-3-OH) (R)-12-hydroxy-N-propyloctadecanamide (HS-3), have been investigated in wide range liquids. A unique aspect some HS-n-OH gels degree velocity their recovery viscoelasticity after cessation destructive shear. times vary from less than one second to hundreds seconds, depending ω-hydroxyalkyl group nitrogen. data indicate that modes dynamics aggregation gelator molecules incubation sol phase below gel melting temperature, analyzed by Avrami fractal equations, cannot be used explain thixotropy: sol-to-gel transformations involve assembly 0-dimensional objects (i.e., individual molecules) into 1-dimensional fibrils then 3-dimensional networks; mechano-destruction requires only re-assembly or re-association spherulitic objects. model understand extreme sensitivity thixotropy (which based upon detailed comparisons among dynamic properties gels, morphologies neat gelators, fibrillar networks gels) invokes importance cleavage reformation H-bonds between fibers at ‘junction zones’