title: Temperature induced phase separation of luminescent silica nanoparticles in Triton X-100 solutions.
abstract: The aggregation and cloud point behavior of Tb(III)-doped silica nanoparticles has been studied in Triton X-100 (TX-100) solutions at various concentration conditions by fluorimetry, dynamic light scattering, electrophoresis and transmission electron microscopy methods. The temperature responsive behavior of nanoparticles is observed at definite concentration of TX-100, where the aggregation of TX-100 at the silica/water interface is evident from the increased size of the silica nanoparticles. The reversible dehydration of TX-100 aggregates at the silica/water interface should be assumed as the main reason of the temperature induced phase separation of silica nanoparticles. The distribution of nanoparticles between aqueous and surfactant rich phases at the phase separation conditions can be modified by the effect of additives.
authors.affiliation: A.E. Arbuzov Institute of Organic and Physical Chemistry, Arbuzov Street, 8, 420088 Kazan, Russia. asiyamust@mail.ru
authors.forename: Asiya R
authors.initials: AR
authors.lastname: Mustafina
authors.forename: Julia G
authors.initials: JG
authors.lastname: Elistratova
authors.forename: Olga D
authors.initials: OD
authors.lastname: Bochkova
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Burilov
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Fedorenko
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Konovalov
authors.forename: Svetlana Ye
authors.initials: SY
authors.lastname: Soloveva
mesh_terms: D006863:Hydrogen-Ion Concentration; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D017830:Octoxynol / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D012822:Silicon Dioxide / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D049408:Luminescent Agents; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D013725:Terbium; D012965:Sodium Chloride; D012822:Silicon Dioxide; D017830:Octoxynol