jp7b02239_si_004.mpg (9.18 MB)
Kinetics of Light-Induced Concentration Patterns in Transparent Polymer Solutions
media
posted on 2017-06-14, 00:00 authored by M. Anyfantakis, A. Pamvouxoglou, C. Mantzaridis, S. Pispas, H-J Butt, G Fytas, B. LoppinetWhen
exposed to weak visible laser light, solutions of common polymers
like poly(isoprene) and poly(butadiene) respond by local concentration
variations, which in turn lead to refractive index changes. Various
micropatterns have been recently reported, depending mostly on the
solvent environment and the irradiation conditions. Here, we focused
on the simpler case of single polymer-rich filaments and we employed
phase contrast microscopy to systematically investigate the influence
of laser illumination and material parameters on the kinetics of the
optically induced local concentration increase in the polydiene solutions.
The refractive index contrast of the formed filaments increased exponentially
with the laser illumination time. The growth rate exhibited linear
dependence on the laser power and increased with polymer chain length
in semidilute solutions in good solvents. On the contrary, the kinetics
of the formed filaments appeared to be rather insensitive to the polymer
concentration. Albeit the origin of the peculiar light field-polymer
concentration coupling remains yet elusive, the new phenomenology
is considered necessary for the elucidation of its mechanism.
History
Usage metrics
Categories
Keywords
polydiene solutionsmaterial parameterslight field-polymer concentrationpolymer-rich filamentslaser illumination timeindex changessemidilute solutionsphase contrast microscopyTransparent Polymer Solutionsirradiation conditionspolymer concentrationconcentration increaselaser powerlaser illuminationLight-Induced Concentration PatternsVarious micropatternsconcentration variationslaser lightkineticgrowth ratepolymer chain lengthindex contrast
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC