A self healing model based on polymer-mediated chromophore correlations.

  title={A self healing model based on polymer-mediated chromophore correlations.},
  author={Shiva K. Ramini and Mark G. Kuzyk},
  journal={The Journal of chemical physics},
  volume={137 5},
Here we present a model of self healing in which correlations between chromophores, as mediated by the polymer, are key to the recovery process. Our model determines the size distribution of the correlation volume using a grand canonical ensemble through a free energy advantage parameter. Choosing a healing rate that is proportional to the number of undamaged molecules in a correlated region, and a decay rate proportional to the intensity normalized to the correlation volume, the ensemble… 
Experimental tests of a new correlated chromophore domain model of self-healing in a dye-doped polymer
Temperature-dependent photodegradation and recovery studies of Dipserse Orange 11 (DO11) dye dissolved in poly(methyl methacrylate) and polystyrene polymer hosts are used as a test of a new model
Correlated aggregate model of self-healing in dye-doped polymers
Self healing of chromophores in a dye-doped polymer after photodegradation is a counterintuitive process based on the nearly universal observation that molecular damage is a thermodynamically
Correlation between molecular structure and self-healing in a series of Anthraquinone derivatives doped in PMMA polymer
We observe that many different derivatives of anthraquinone chromophores doped in PMMA self heal after undergoing photodegradation. We are interested to know the mechanisms that are responsible for
The role of polymer-mediated dopant correlations in damage moderation and self healing
The fact that chromophores doped into a polymer self heal after photodegradation seems to contradict the common understanding that molecular damage is a thermodynamically irreversible process. We
Generalizing the correlated chromophore domain model of reversible photodegradation to include the effects of an applied electric field.
The domain model is generalized to describe the effects of an electric field by including induced dipole interactions between molecules in a domain by means of a self-consistent field approach and the voltage-dependent measurements suggest that the largest polarizability axis of the molecules are oriented perpendicular to the chain.
Imaging studies of temperature dependent photodegradation and self-healing in disperse orange 11 dye-doped polymers.
While the temperature dependence predictions of the modified correlated chromophore domain model (mCCDM) are confirmed, it is found that it is quantitatively incompatible with the mCCDM as recovery in DO11/PS is found to behave as a stretched (or double) exponential as a function of time.
Self-Healing Properties of 1-Amino,2,4-Dibromoanthraquinone Dye Doped in PMMA Polymer
We used fluorescence spectroscopic measurements as a probe to study the self-healing properties of anthraquinone derivative molecules doped in poly(methyl methacrylate) (PMMA).
Imaging studies of photodegradation and self-healing in anthraquinone derivative dye-doped PMMA.
1,8-dihydroxyanthraquinone (Dantron/Chrysazin) is found to be having the best photostability and recovery characteristics of all dyes tested in this study, and three rules-of-thumb are developed to qualitatively predict the photostabilities and Recovery characteristics of anthraquin one derivatives.
Influence of an electric field on photodegradation and self-healing in disperse orange 11 dye-doped PMMA thin films
The influence of an applied electric field on reversible photodegradation of disperse orange 11 doped into (poly)methyl-methacrylate (PMMA) is measured using digital imaging and conductivity
Self-healing organic-dye-based random lasers.
The observation of "reversible" photodegradation in a Rhodamine 6G and ZrO2 nanoparticle-doped polyurethane random laser finds that during degradation, the emission broadens, redshifts, and decreases in intensity.


The photochemistry of the self-healing chromophore Disperse Orange 11
Recent interest in the self-healing ability of the laser dye 1-amino-2-methylanthraquinone, Disperse Orange 11, has lead us to investigate the possible alternative mechanisms of action, either
Testing the diffusion hypothesis as a mechanism of self-healing in Disperse Orange 11 doped in poly(methyl methacrylate)
In this work, we show that reversible photodegradation of Disperse Orange 11 doped in poly(methyl methacrylate) is not due to dye diffusion—a common phenomenon observed in many dye-doped polymers.
Mechanisms of reversible photodegradation in disperse orange 11 dye doped in PMMA polymer.
An energy level diagram is constructed that describes all measured quantities in the decay and recovery processes and a hypothesis of the nature of the associated states is proposed.
Exact results and mean field approximation for a model of molecular aggregation
We present a simple one-dimensional model with molecular interactions favoring the formation of clusters with a defined optimal size. Increasing the density, at low temperature, the system goes from
Imaging studies of photodamage and self-healing in disperse orange 11 dye-doped PMMA
We report on optical imaging studies of self-healing after laser-induced photodamage in disperse orange 11 dye doped into poly(methyl methacrylate) (PMMA) polymer. In particular, the high
Aggregation properties of the chromonic liquid crystal benzopurpurin 4B.
Optical polarization, absorption, and scattering studies along with confocal microscopy reveal that Benzopurpurin 4B forms aggregates of micrometer size at very low concentrations in aqueous solution, putting it in a different class, probably more similar to Scheibe or Jelly aggregates than the typical chromonic systems that are formed by simple stacks of molecules.
Dye photodestruction in a solid-state dye laser with a polymeric gain medium.
  • S. Popov
  • Physics, Materials Science
    Applied optics
  • 1998
A comparison of the present results with recently published data demonstrates the major role of photodestruction, rather than direct thermodESTruction, in the dye stability of the solid-state gain medium.
Dye-doped organogels: A new medium for two-photon pumped lasing and other optical applications
The work presented here describes the use of organogels as alternate medium for optical applications. The structural flexibility and thermoreversible nature of dye-doped organogels offer advantages
Hardening of polymer optical materials with laser cycling and gamma-rays
When certain molecules are doped into polymers, they are photo-chemically more stable to photodegradation than the same molecule in liquid solution or crystalline form. Furthermore, such composite
Dyes in modified polymers:, problems of photostability and conversion efficiency at high intensities
We present the results of the investigation of modified polymethyl methacrylate doped with xanthene-series dyes, phthalocyanine, and chelates in the regimes of laser generation and saturated