The interfacial interactions of Tb-doped silica nanoparticles with surfactants and phospholipids revealed through the fluorescent response.
The quenching effect of dyes (phenol red and bromothymol blue) on Tb(III)-centered luminescence enables to sense the aggregation of cationic and anionic surfactants near the silica surface of Tb-doped silica nanoparticles (SN) in aqueous solutions. The Tb-centered luminescence of non-decorated SNs is diminished by the inner filter effect of both dyes. The decoration of the silica surface by cationic surfactants induces the quenching through the energy transfer between silica coated Tb(III) complexes and dye anions inserted into surfactant aggregates. Thus the distribution of surfactants aggregates at the silica/water interface and in the bulk of solution greatly affects dynamic quenching efficiency. The displacement of dye anions from the interfacial surfactant adlayer by anionic surfactants and phospholipids is accompanied by the "off-on" switching of Tb(III)-centered luminescence.
AE Arbuzov Institute of Organic and Physical Chemistry, Kazan, Russia.
Olga D
OD
Bochkova
Asiya R
AR
Mustafina
Alsu R
AR
Mukhametshina
Vladimir A
VA
Burilov
Viktoriya V
VV
Skripacheva
Lucia Ya
LY
Zakharova
Svetlana V
SV
Fedorenko
Alexander I
AI
Konovalov
Svetlana E
SE
Soloveva
Igor S
IS
Antipin
D000042:Absorption; D001979:Bromthymol Blue / Q000737:chemistry; D002412:Cations; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D005453:Fluorescence; D057446:Hydrodynamics; D053758:Nanoparticles / Q000737:chemistry*; D010637:Phenolsulfonphthalein / Q000737:chemistry; D010715:Phosphatidylglycerols / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013057:Spectrum Analysis; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*
D002412:Cations; D002593:Cetrimonium Compounds; D010715:Phosphatidylglycerols; D010743:Phospholipids; D013501:Surface-Active Agents; D013725:Terbium; D012967:Sodium Dodecyl Sulfate; C084352:distearoyl phosphatidylglycerol; D012822:Silicon Dioxide; D010637:Phenolsulfonphthalein; D001979:Bromthymol Blue; D000077286:Cetrimonium