Photo-Induced Phase Transitions to Liquid Crystal Phases: Influence of the Chain Length from C8E4 to C14E4

Materials

Marcel Petri¹  Gerhard Busse²  Wilson Quevedo² 

[1] Department of Structural Dynamics of (Bio)chemical Systems, Max Planck Institute for Biophysical Chemistry, 37070 Göttingen, Germany;

关键词: photo-induced phase-transition;    time-resolved;    small angle x-ray scattering (SAXS);    self-assembly;    entropy-driven;   

DOI  :  10.3390/ma2031305

来源: mdpi

【 摘 要 】

Photo-induced phase transitions are characterized by the transformation from phase A to phase B through the absorption of photons. We have investigated the mechanism of the photo-induced phase transitions of four different ternary systems C_iE₄/alkane (i) with n = 8, 10, 12, 14; cyclohexane/H₂O. We were interested in understanding the effect of chain length increase on the dynamics of transformation from the microemulsion phase to the liquid crystal phase. Applying light pump (pulse)/x-ray probe (pulse) techniques, we could demonstrate that entropy and diffusion control are the driving forces for the kind of phase transition investigated.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.