The encapsulation efficiency of high-T<inf>g</inf> polynorbornene micelles was probed with a hydrophobic dye 2,6-diiodoboron-dipyrromethene (BODIPY). Changes in the visible absorption spectra of aggregated versus monomeric dye molecules provided a probe for assessing encapsulation. Polynorbornene micelles are found to be capable of loading up to one BODIPY dye per ten polymers. As the hydrophilic block size increased in the polymeric amphiphiles, more of the dye was incorporated within the micelles. This result is consistent with the dye associating with the polymer backbone in the shell of the micelles. The encapsulation rate varied significantly with temperature, and a slight dependence on micellar morphology was also noted. Additionally, we report a 740 μs triplet lifetime for the encapsulated BODIPY dye. The lifetime is the longest ever recorded for a BODIPY triplet excited state at room temperature and is attributed to hindered triplet-triplet annihilation in the high-viscosity micellar shell.

Bell, N.C., Doyle, S.J., Battistelli, G., Leguyader, C.L.M., Thompson, M.P., Poe, A.M., et al. (2015). Dye Encapsulation in Polynorbornene Micelles. LANGMUIR, 31(35), 9707-9717 [10.1021/acs.langmuir.5b01822].

Dye Encapsulation in Polynorbornene Micelles

BATTISTELLI, GIULIA;MONTALTI, MARCO;
2015

Abstract

The encapsulation efficiency of high-Tg polynorbornene micelles was probed with a hydrophobic dye 2,6-diiodoboron-dipyrromethene (BODIPY). Changes in the visible absorption spectra of aggregated versus monomeric dye molecules provided a probe for assessing encapsulation. Polynorbornene micelles are found to be capable of loading up to one BODIPY dye per ten polymers. As the hydrophilic block size increased in the polymeric amphiphiles, more of the dye was incorporated within the micelles. This result is consistent with the dye associating with the polymer backbone in the shell of the micelles. The encapsulation rate varied significantly with temperature, and a slight dependence on micellar morphology was also noted. Additionally, we report a 740 μs triplet lifetime for the encapsulated BODIPY dye. The lifetime is the longest ever recorded for a BODIPY triplet excited state at room temperature and is attributed to hindered triplet-triplet annihilation in the high-viscosity micellar shell.
2015
Bell, N.C., Doyle, S.J., Battistelli, G., Leguyader, C.L.M., Thompson, M.P., Poe, A.M., et al. (2015). Dye Encapsulation in Polynorbornene Micelles. LANGMUIR, 31(35), 9707-9717 [10.1021/acs.langmuir.5b01822].
Bell, Nia C; Doyle, Samantha J.; Battistelli, Giulia; Leguyader, Clare L. M.; Thompson, Matthew P.; Poe, Ambata M.; Rheingold, Arnold; Moore, Curtis; ...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/554903
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 10
social impact