1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Fluorescence lifetime fluctuations of single molecules probe local density fluctuations in disordered media: A bulk approach
Rent:
Rent this article for
USD
10.1063/1.1861881
/content/aip/journal/jcp/122/11/10.1063/1.1861881
http://aip.metastore.ingenta.com/content/aip/journal/jcp/122/11/10.1063/1.1861881

Figures

Image of FIG. 1.
FIG. 1.

Two-dimensional representation of a poly(styrene) matrix (lines) embedding a DiD fluorophore (CPK) that reports on its nanolocal environment.

Image of FIG. 2.
FIG. 2.

(a) Fluorescence intensity (squares) and corresponding lifetime (circles) transients of an individual DiD molecule in a thick film of PIBMA at an excitation power of . Data were binned in time interval. The lifetime makes peculiar excursions towards higher values. (b) Correlation plot (top) and fluorescence lifetime distribution (bottom) of the molecule: Asymmetrical fluctuations of the lifetime results in an elongated, cloudy correlation plot and an asymmetric distribution. The lifetime distribution is fitted with a distribution.

Image of FIG. 3.
FIG. 3.

(a) Fluorescence intensity (squares) and corresponding lifetime (circles) transients of an individual DiD molecule in a thick film of PIBMA at an excitation power of . Data were binned in time interval. (b) Correlation plot of the molecule. Intensity and lifetime are perfectly correlated, suggesting the aperture of extra-decay channels in the matrix. This correlated behavior has been observed for only two molecules within the 778 investigated molecules.

Image of FIG. 4.
FIG. 4.

(a)–(c) Fluorescence lifetime distributions of three individual DiD molecules embedded in a thick film of PIBMA. Each lifetime distribution fitted is with a distribution. As the lifetime distribution gets more symmetric, the shape parameter of the distribution increases [from (a) to (c)]. (d)–(f) Distributions of the shape parameters for DiD molecules embedded in the same film at three different temperatures. Shape parameter values decrease with temperature: the asymmetry of the lifetime distributions becomes more and more pronounced as the temperature increases.

Image of FIG. 5.
FIG. 5.

(a) Ratio of the fluorescence lifetime and hole fraction distributions as a function of the hole fraction present in the system. For small hole fractions, the dependence is smoothly linear, which means that both distributions have the same shape. (b) Simulated distribution of hole fraction, characterized by a mean value of 10% and a mean-squared standard deviation of 0.4%. The shape parameter of the distribution is 2.5. (c) Dependence of the fluorescence lifetime of the dye embedded in the matrix on the fraction of holes present in the system. (d) Corresponding distribution of the fluorescence lifetime. has been set equal to to perform the calculation. The shape of this distribution is similar to the one in (b): 2.307.

Image of FIG. 6.
FIG. 6.

Number of segments involved in a segmental rearrangement cell as a function of temperature for a PS (close squares, , thick film) and for a PIBMA (open circles, , thick film) matrix. In both cases, the number of segments decreases with temperature. Linear fits and extrapolation of the two curves are also represented on this graph (straight line for PS and dashed line for PIBMA).

Tables

Generic image for table
Table I.

Characteristic pressure , volume , temperature , and expansion coefficient for the polymers.

Loading

Article metrics loading...

/content/aip/journal/jcp/122/11/10.1063/1.1861881
2005-03-17
2014-04-20
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fluorescence lifetime fluctuations of single molecules probe local density fluctuations in disordered media: A bulk approach
http://aip.metastore.ingenta.com/content/aip/journal/jcp/122/11/10.1063/1.1861881
10.1063/1.1861881
SEARCH_EXPAND_ITEM