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• Petri, M
• Busse, G
• Quevedo, W
• Techert, S
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• Busse, G
• Quevedo, W
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• Busse, G
• Quevedo, W
• Techert, S

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Materials 2009, 2(3), 1305-1322; doi:10.3390/ma2031305

Article

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

Marcel Petri* , Gerhard Busse, Wilson Quevedo and Simone Techert*

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

* Authors to whom correspondence should be addressed.

Received: 28 August 2009; in revised form: 14 September 2009 / Accepted: 16 September 2009 / Published: 17 September 2009

(This article belongs to the Special Issue Liquid Crystals)

Download PDF Full-Text [987 KB, uploaded 17 September 2009 07:35 CEST]

Abstract: 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.

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

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